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Download Data from ArcGIS Server using Out-of-the-Box Solution

AkhilParujanwala

Hi,

I am trying to download data from my server without having to click on Manage Edits > Get Data, I want have a single click button to download the data.

The code posted below should work with a fully customized solution, but I am curious as to how I can modify the code so that it can be used to download data just like the Get Data method that ESRI provides.

MobileCache m_mobileCache1;
m_mobileCache1 = new MobileCache(@C:\user\MobileCache);            
m_mobileCache1.Open();                        
Map mMap = new Map();
mMap.MapLayers.AddRange(m_mobileCache1);
            
if (m_mobileCache1.CacheExists)
{
   m_mobileCache1.Close();
   m_mobileCache1.DeleteCache();
}

MobileServiceConnection con = new MobileServiceConnection();
con.Url = @"http://server/arcgis/services/Test_Mobile_Services/Radiation_Data_V1_B11/MapServer/Mobileserver";
con.CreateCache(m_mobileCache1);
m_mobileCache1.Open();
            
            
MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1);
agent.MapDocumentConnection = con;            
agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);           
mMap.MapLayers.AddRange(m_mobileCache1);

Thanks,

Akhil P.

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AkhilParujanwala

Ok this is what I go so far in terms of downloading the data, remember I am a heavily customized Out-of-the-box solution, Windows Tablet platform (not Mobile).

The data appears to download properly, I see new modified files in the cache folder, however I am unable to display the newly downloaded layers on the map. look in code for my problem at the end.

MobileCache mobileCache1 = new MobileCache();
            Map map1 = new Map();
            MapControl mapControl1 = new MapControl();
            MobileServiceConnection mobileServiceConnection1 = new MobileServiceConnection();

            //mobileServiceConnection1.CreateCache("Rad_Data");
            try
            {
                mobileCache1.StoragePath = @C:\Akhil\ArcGIS_Mobile_Projects\P_Radiation_Data_V3_B1\Radiation_Data;
                //Uncomment these lines if you are using your own service
                mobileCache1.DeleteCache();
                mobileServiceConnection1.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data/MapServer/MobileServer";
                MobileCacheSyncAgent mobileSync = new MobileCacheSyncAgent(mobileCache1, mobileServiceConnection1);
                MobileCacheSyncResults mobileResults = new MobileCacheSyncResults();
                //get the schema to determine list of layers
                mobileServiceConnection1.CreateCache(mobileCache1);
                mobileCache1.Open();
                mobileSync.Synchronize();
                //map1.DataSources.Add(mobileCache1); <-- THIS DOES NOT WORK
                //mapControl1.Map.Content = (mobileCache1); <-- THIS DOES NOT WORK
                
            }
            catch
            {
                MessageBox.Show("Cannot open map cache");
            }

Mind you i don't get an error nor does the application crash.

Please help, thanks in advance,

Akhil P.

AkhilParujanwala

I have also tried.

mapControl.Map.MapLayers.AddRange(mobileCache1);

Still doesn't work, but no errors either.

AkhilParujanwala

I tried this:

MobileApplication.Current.Map.MapLayers.AddRange(mobileCache1);

This makes a lot more sense, it seems to do something, once I tigger this event "Download_Data()" for the second time it says:

"The process cannot access the file 'c:\temp\MapCache\MobileCache.db' because it is being used by another process."

This shows that somehow it is sort of working, but I still don't see any downloaded data on the map.

For example I have two data collectors, one collecting green dots and the other collecting red dots. When the person triggers Download_Data() it should download the data and display the red dots collected by the other person. Both collectors are posting updates every minute as well.

As you can see I am trying to create a system in which data is being uploaded to the server in near real time and downloaded also in near real time. The problem is trying to make this Download_Data() procedure to work the way I want.

Can someone shed some light on this please.

Thanks,

Akhil P.

MelindaFrost

If you start looking under the hood at what mobileSync is doing through debugger- it basically ends up looping through each feature layer and calling a full featurelayersyncagent on each one.
What you can do instead is loop through each feature layer, create a featurelayersync and set download direction and download filter. These greatly speeds up the sync process time.
If you still do not see the new data- try calling a map refresh.
You could also dive into your featurelayersynresult and see if any exceptions are occuring. I have found any exceptions that happen in the sync do not bubble up to the application. You have to wrtie code to check all the exceptions and if any display the error.

AkhilParujanwala

Thanks buddha,

That's very interesting, yes at the moment it appears to loop through all the layers in my service and downloads them all.

I definitely only want to download 3 layers from the service, not all, so your suggestion of looping through the layers would will work.

I am currently just playing around with this code just to test it out, the problem is that I don't know how to refresh the map.

I understand there is a Refresh() -> void, but I can't seem to call it, because none of my objects can call upon it.

MobileApplication.Current.Map........????

I have tried a number of combinations, am I suppose to make an instance of the map/mapcontrol. This has been puzzling me for two weeks now.

Thanks,

Akhil P.

AkhilParujanwala

I have also tried this, partially what you said Buddha.

public static void Download_Data()
        {
            ESRI.ArcGIS.Mobile.Client.Windows.MessageBox.ShowDialog("This is where the automatic download of data occurs!");
            // Create an instance of MobileCache, and set StoragePath
            MobileCache mobileCache = new MobileCache();
            mobileCache.StoragePath = @C:\Akhil\ArcGIS_Mobile_Projects\P_Radiation_Data_V1_B1\Radiation_Data_V1;

            try
            {
               

                if (mobileCache.CacheExists)
                {
                    mobileCache.Close();

                }

                mobileCache.Open();
                MobileServiceConnection con = new MobileServiceConnection();
                con.Url = "http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/MobileServer";

                FeatureLayerSyncAgent agent0 = new FeatureLayerSyncAgent(mobileCache.FeatureLayers[0]);
                agent0.MapDocumentConnection = con;
                agent0.StateChanged += new EventHandler(agent_StateChanged);
                agent0.Synchronize();

                FeatureLayerSyncAgent agent1 = new FeatureLayerSyncAgent(mobileCache.FeatureLayers[1]);
                agent1.MapDocumentConnection = con;
                //agent1.StateChanged += new EventHandler(agent_StateChanged);
                agent1.StateChanged += new EventHandler(agent_StateChanged);
                agent1.Synchronize();

                FeatureLayerSyncAgent agent2 = new FeatureLayerSyncAgent(mobileCache.FeatureLayers[2]);
                agent2.MapDocumentConnection = con;
                agent2.StateChanged += new EventHandler(agent_StateChanged);
                agent2.Synchronize();

catch (Exception exception)
            {
                if (mobileCache.CacheExists)
                {
                    if (mobileCache.IsOpen)
                    {
                        mobileCache.Close();
                    }
                }
            }

I am still unable to figure out how to display the newly downloaded content, the cache does download. Please shed some light on this.

Thanks,

Akhil P.

AngelGonzalez

See the ESRI sample "DataCollection_Win" which should be installed locally. By looking at the sample I made the following changes to your code.

MobileCache m_mobileCache1;
m_mobileCache1 = new MobileCache(@C:\user\MobileCache);
m_mobileCache1.Open();
Map mMap = new Map();
//mMap.MapLayers.AddRange(m_mobileCache1);

// Delete the above line since your doing this at the end of your code


if (m_mobileCache1.CacheExists)
{
   m_mobileCache1.Close();
   m_mobileCache1.DeleteCache();
}
else
{
   //You did a m_mobileCache1.Open(); twice if cache does not exist
   // Once above and once below. You need to close it here since you are opening it below

   m_mobileCache1.Close();
}

MobileServiceConnection con = new MobileServiceConnection();
con.Url = @"http://server/arcgis/services/Test_Mobile_Services/Radiation_Data_V1_B11/MapServer/Mobileserver";
con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
m_mobileCache1.Open();


MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
agent.MapDocumentConnection = con;
agent.Synchronize(); // See if Synchronize works instead of line below
//agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);
mMap.MapLayers.AddRange(m_mobileCache1);

If the above changes does not work try adding the following at the end of your code:
LoadData();
mMap.Refresh();

AkhilParujanwala

Thank you for the help Angel, but same problem, the map does not show the update/synchronized data points.

For example, I can make 5 points on the map using the mobile application, then I would go into ArcMap and delete 4 points, leaving 1 point. This is while the application is running, then I trigger Download_Data and sure the cache appears to be updated, since the modified time changed, but the map I see still displays 5 points.

But if I go to Tasks > Manage Edits > Get Data... (this is the Out-of-the-box solution) it will properly download the data, and display the map with 1 point.

The concept of opening, deleting and creating the cache makes sense to me, I have successfully done this as well, the problem is the application will not render the newly created cache, even tho we are telling it to.

At the end of the code I tried invalidate, refresh and LoadData, neither of them work.

public static void Download_Data()
        {
            MobileCache m_mobileCache1;
            m_mobileCache1 = new MobileCache(@C:\Akhil\MobileCache);
            MessageBox.Show("before opening mobile cache");
            m_mobileCache1.Open();
            Map mMap = new Map();
            MessageBox.Show("new map");
            //mMap.MapLayers.AddRange(m_mobileCache1);

            // Delete the above line since your doing this at the end of your code


            if (m_mobileCache1.CacheExists)
            {
                m_mobileCache1.Close();
                m_mobileCache1.DeleteCache();
                MessageBox.Show("deletes cache");
            }
            else
            {
                //You did a m_mobileCache1.Open(); twice if cache does not exist
                // Once above and once below. You need to close it here since you are opening it below

                m_mobileCache1.Close();
                MessageBox.Show("closes cache");
            }
            MessageBox.Show("creating mobile connection");
            MobileServiceConnection con = new MobileServiceConnection();
            MessageBox.Show("after creating mobile connection");
            con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";                        
            MessageBox.Show("sets the URL");
            con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
            m_mobileCache1.Open();
            MessageBox.Show("opens cache");


            MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
            agent.MapDocumentConnection = con;
            //agent.Synchronize(); // See if Synchronize works instead of line below            
            agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);
            MessageBox.Show("after synch");
            mMap.MapLayers.AddRange(m_mobileCache1);
            MessageBox.Show("adds to map");
            //LoadData();
            //mMap.Refresh();
            mMap.Invalidate();
        }

AngelGonzalez

Instead of using a new map control why not reference the original map control mapControl1

public static void Download_Data()
        {
            MobileCache m_mobileCache1;
            m_mobileCache1 = new MobileCache(@C:\Akhil\MobileCache);
            MessageBox.Show("before opening mobile cache");
            m_mobileCache1.Open();
           // Map mMap = new Map();// kill this line
            MessageBox.Show("new map");
            //mMap.MapLayers.AddRange(m_mobileCache1);

            // Delete the above line since your doing this at the end of your code

            if (m_mobileCache1.CacheExists)
            {
                m_mobileCache1.Close();
                m_mobileCache1.DeleteCache();
                MessageBox.Show("deletes cache");
            }
            else
            {
                //You did a m_mobileCache1.Open(); twice if cache does not exist
                // Once above and once below. You need to close it here since you are opening it below

                m_mobileCache1.Close();
                MessageBox.Show("closes cache");
            }
            MessageBox.Show("creating mobile connection");
            MobileServiceConnection con = new MobileServiceConnection();
            MessageBox.Show("after creating mobile connection");
            con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";
            MessageBox.Show("sets the URL");
            con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
            m_mobileCache1.Open();
            MessageBox.Show("opens cache");

            MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
            agent.MapDocumentConnection = con;
            //agent.Synchronize(); // See if Synchronize works instead of line below
            agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);
            MessageBox.Show("after synch");
            //mMap.MapLayers.AddRange(m_mobileCache1);   // kill this line
             mapControl1.MapLayers.AddRange(m_mobileCache1);

            MessageBox.Show("adds to map");
            //LoadData();
            //mMap.Refresh();
            mMap.Invalidate();
        }

AkhilParujanwala

mapControl1.MapLayers.AddRange(m_mobileCache1);

This line makes sense, but I can't use it because mapControl1 does not exist, I am using the out-of-the-box solution in which I don't know how to address the map or mapcontrol. That's why I thought making an instance of the map would work, but it doesn't.

Also I am using the Tablet version which is WPF.

I have tried this

using ESRI.ArcGIS.Mobile.WPF;

ESRI.ArcGIS.Mobile.WPF.Map mMap = new ESRI.ArcGIS.Mobile.WPF.Map();

mMap.MapLayers.AddRange(m_mobileCache1);

But this still does not work, I am running out of ideas, 😞

AngelGonzalez

If you are using the out of the box solution (which ia a WPF app) see the following link:

http://help.arcgis.com/en/arcgismobile/10.0/apis/ArcGISMobile/WinApp/WinAppFramework_Using_MapPage.htm

It shows how to get a reference to the mapControl

AkhilParujanwala

Thanks Angelg the link you gave me worked, but there are 2 problems and 1 more thing I need to handle.

1) The first problem is the first try and catch section, the catch is always triggered because the cache is in use. The error is "cache is in use by another process", fortunately aslong as a messagebox appears the code will continue, and works as expected.

2) If I comment out the first catch messagebox, the second try and catch section is triggered. The error states "object reference is invalid". As long as we can solve the first problem then hopefully the second try and catch will work without problems.

3) As you can see I am creating my own custom download data procedure. The goal is to trigger this procedure everytime the user creates a new point. This will allow the field collector can see everyone elses points at the immediately, rather than manually clicking on download data.

So I have managed to trigger this properly using CollectionCompletedEvent. But my data collectors may be working in a non-connected environment (no internet) and I want to handle this without some messagebox appearing everytime stating "you are not connected to the internet". I want to put an If statement, if connected to internet, then download data, otherwise don't do anything.

public static void Download_Data()
        {
            ViewMapTask viewMapTask = (ViewMapTask)MobileApplication.Current.Project.Tasks.GetFirstExtensionOfType(typeof(ViewMapTask));
            ViewMapPage viewMapPage = viewMapTask.ViewMapPage;
            MapControl mMap = viewMapTask.ViewMapPage.MapControl;

            MobileCache m_mobileCache1;
            m_mobileCache1 = new MobileCache(@C:\Akhil\ArcGIS_Mobile_Projects\P_Radiation_Data_V1_B8\Radiation_Data_V1);

            m_mobileCache1.Open();

            if (m_mobileCache1.CacheExists)
            {
                m_mobileCache1.Close();

                try
                {
                    m_mobileCache1.DeleteCache();
                }
                catch (Exception ex)
                {
                    MessageBox.Show("FIRST ERROR " + Convert.ToString(ex));
                }
            }
            else
            {
                m_mobileCache1.Close();
            }
            
            MobileServiceConnection con = new MobileServiceConnection();            
            con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";
            con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
            m_mobileCache1.Open();           

            MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
            agent.MapDocumentConnection = con;
            //agent.Synchronize(); // See if Synchronize works instead of line below            
            agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);            

            try
            {   
                mMap.Map.MapLayers.AddRange(m_mobileCache1);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Second ERROR " + ex.ToString());
            }
        }

Thanks,

Akhil P.

AngelGonzalez

Hi Akhilp,

I am in the process of converting a custom 9.3 windows laptop mobile app to 10 and I am running into some issues you are are having since I need a custom upload/download of data since editing is done in the field in a disconnected mode and uploading is done when inspectors are back in the office. My next project will be a WPF app so some of your ideas are helping me plan ahead. Fortunately the C# for a WPF and a windows app are very simliar. See below as to the changes you should try.

1) The first problem is the first try and catch section, the catch is always triggered because the cache is in use. The error is "cache is in use by another process", fortunately aslong as a messagebox appears the code will continue, and works as expected.

I modified your first try catch. I notice that I don't actually need to open and close a cache to delete it.

2) If I comment out the first catch messagebox, the second try and catch section is triggered. The error states "object reference is invalid". As long as we can solve the first problem then hopefully the second try and catch will work without problems.

See code below, I think you added an extra reference to the Map that I do not see in ESRI samples.

public static void Download_Data()
        {
            ViewMapTask viewMapTask = (ViewMapTask)MobileApplication.Current.Project.Tasks.GetFirstExtensionOfType(typeof(ViewMapTask));
            ViewMapPage viewMapPage = viewMapTask.ViewMapPage;
            MapControl mMap = viewMapTask.ViewMapPage.MapControl;

            MobileCache m_mobileCache1;
            m_mobileCache1 = new MobileCache(@C:\Akhil\ArcGIS_Mobile_Projects\P_Radiation_Data_V1_B8\Radiation_Data_V1);

           
            if (m_mobileCache1.CacheExists)
            {
               
                try
                {
                    m_mobileCache1.DeleteCache();
                }
                catch (Exception ex)
                {
                    MessageBox.Show("FIRST ERROR " + Convert.ToString(ex));
                }
            } 
                       
            MobileServiceConnection con = new MobileServiceConnection();            
            con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";
            con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
            m_mobileCache1.Open();           

            MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
            agent.MapDocumentConnection = con;
            //agent.Synchronize(); // See if Synchronize works instead of line below            
            agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);            

            try
            {   
               // mMap.Map.MapLayers.AddRange(m_mobileCache1); This line should be as follows:
                    mMap.MapLayers.AddRange(m_mobileCache1);
            }
            catch (Exception ex)
            {
                MessageBox.Show("Second ERROR " + ex.ToString());
            }
        }

Angel

AkhilParujanwala

Ah I see, I have also worked with 9.3, I used Windows Mobile, but now I am using 10.0 and working on WPF Tablet version. If I have time I will be re-writing all my code for Windows Mobile, so that our data collectors can use either types.

I have made the changes as suggested, with some modifications:

1) I have tried your suggestion to the first try and catch before and had the same problem, it always states that the cache.db file is in use.

2) I made a instance of the map so that I can use myMap.MapLayers.AddRange but it doesn't like this.

3) I went back to mMap.Map.MapLayers.AddRange and it works better, but I still get an error in the first try and catch stating that the cache.db file is in use by another process.

NOTE: The change made in #2 does work if you manually refresh the map by zooming, but the code in #3 will cause the map to refresh immediately after you click on the error presented from the first try and catch.

It make sense that the cache.db file is in use by the application, because you can phstyically see the cached radiation points on the map. I (we) assumed that mobileCache.Close should stop ArcGIS Mobile from using that folder containing the cache so that we can delete and download a new one, but this is not the case.

The only other thing I can think of is having two cache folders, one that is in use and the other isn't, and the application will switch back and forth as the download data is triggered. Mind you how does the ESRI Get Data button work around this issue, it seemlessly downloads the data and displays it on the map perfectly.

public static void Download_DataAkhil()
        {
            ViewMapTask viewMapTask = (ViewMapTask)MobileApplication.Current.Project.Tasks.GetFirstExtensionOfType(typeof(ViewMapTask));
            ViewMapPage viewMapPage = viewMapTask.ViewMapPage;
            MapControl mMap = viewMapTask.ViewMapPage.MapControl;
            ESRI.ArcGIS.Mobile.WPF.Map MyMap = mMap.Map;

            MobileCache m_mobileCache1;
            m_mobileCache1 = new MobileCache(@C:\Akhil\ArcGIS_Mobile_Projects\P_Radiation_Data_V1_B8\Radiation_Data_V1);
            
            if (m_mobileCache1.CacheExists)
            {
                try
                {                    
                    m_mobileCache1.DeleteCache();
                }
                catch (Exception ex)
                {
                    MessageBox.Show(Convert.ToString(ex)); //Still gives error
                }
            }
            else
            {
                m_mobileCache1.Close();
            }
            
            MobileServiceConnection con = new MobileServiceConnection();            
            con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";
            con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
            m_mobileCache1.Open();           

            MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
            agent.MapDocumentConnection = con;
            //agent.Synchronize(); // See if Synchronize works instead of line below            
            agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);            

            try
            {   
                //mMap.Map.MapLayers.AddRange(m_mobileCache1);
                MyMap.MapLayers.AddRange(m_mobileCache1); //Gives error now, stating null reference
            }
            catch (Exception ex)
            {
                MessageBox.Show("This is second ERROR " + ex.ToString());
            }
        }

Thanks,

Akhil P.

AkhilParujanwala

Done! Well almost, still need to put in a check if there is internet or no internet (this may not even be needed).

Ok so I got it to work:

1) As you can see I have made many attempts to make an instance of the Map, I finally got it with the first line of code.

This solved the null reference to all my other attempts of making an instance of Map or MapControl.

2) You don't have to delete the old cache, I checked the ESRI out-of-the-box Get Data button and watched the folder if it delete the cache or not and it does not.

In addition you don't even have to close the cache, based on the code below, I haven't opened the cached, so I don't need to close it. I keep the code there, but commented it out so you could see.

3) Got rid of the second try and catch, since I was making a proper reference to Map.

4) The service that I am connecting to only has 3 layers, those that will be constantly be used by data collectors. I have many other services, one for basemap vectors layers, a dummy layer for a table, a service for AGM Members and AGM Log.

Since there are only 3 operational layers and they are point layers, I didn't need to use FeatureSyncLayer to individually synchronize the layers, I am able to just synchronize the entire service, which is good.

5) The code is so short! 🙂

public static void Download_DataAkhil()
        {            
            ESRI.ArcGIS.Mobile.WPF.Map nMap = MobileApplication.Current.Map;
            
            //ViewMapTask viewMapTask = (ViewMapTask)MobileApplication.Current.Project.Tasks.GetFirstExtensionOfType(typeof(ViewMapTask));
            //ViewMapPage viewMapPage = viewMapTask.ViewMapPage;
            //MapControl mMap = viewMapTask.ViewMapPage.MapControl;
            //ESRI.ArcGIS.Mobile.WPF.Map MyMap = mMap.Map;

            MobileCache m_mobileCache1;
            m_mobileCache1 = new MobileCache(@C:\Akhil\ArcGIS_Mobile_Projects\P_Radiation_Data_V1_B8\Radiation_Data_V1);

            //if (m_mobileCache1.CacheExists) //not needed
            //    m_mobileCache1.Close(); //not needed
                        
            MobileServiceConnection con = new MobileServiceConnection();            
            con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";
            con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
            m_mobileCache1.Open();           

            MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
            agent.MapDocumentConnection = con; 
            agent.Synchronize(); // See if Synchronize works instead of line below             
            //agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);
                          
            nMap.MapLayers.AddRange(m_mobileCache1);
        }

Thanks Buddha and Angel for helping me out, now everyone can enjoy this. 🙂

Akhil P.

AngelGonzalez

Glad you figured it out. One thing I found out today regarding the line of code highlighted below. If you run this line of code in your app without deleting the current cache ESRI Mobile will literally add the same layers on top of your current layers. If this line of code is run 3 or 4 times the layer will be drawn 3 or 4 times (on top of each other). To prove this just make one of your point layer label be visible, then run "Download_DataAkhil()" twice within the same mobile session. The label will appear twice for the same point (this is what happened to me while testing an app). I believe that "xyz.MapLayers.AddRange(m_mobileCache1);" should only be used when the mapCache is deleted first, otherwise delete this line from your code if you are using the same mapCache.

Angel

public static void Download_DataAkhil()
        {            
            ESRI.ArcGIS.Mobile.WPF.Map nMap = MobileApplication.Current.Map;
            
            //ViewMapTask viewMapTask = (ViewMapTask)MobileApplication.Current.Project.Tasks.GetFirstExtensionOfType(typeof(ViewMapTask));
            //ViewMapPage viewMapPage = viewMapTask.ViewMapPage;
            //MapControl mMap = viewMapTask.ViewMapPage.MapControl;
            //ESRI.ArcGIS.Mobile.WPF.Map MyMap = mMap.Map;

            MobileCache m_mobileCache1;
            m_mobileCache1 = new MobileCache(@C:\Akhil\ArcGIS_Mobile_Projects\P_Radiation_Data_V1_B8\Radiation_Data_V1);

            //if (m_mobileCache1.CacheExists) //not needed
            //    m_mobileCache1.Close(); //not needed
                        
            MobileServiceConnection con = new MobileServiceConnection();            
            con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";
            con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
            m_mobileCache1.Open();           

            MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
            agent.MapDocumentConnection = con; 
            agent.Synchronize(); // See if Synchronize works instead of line below             
            //agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);
                          
            nMap.MapLayers.AddRange(m_mobileCache1);
        }

Thanks Buddha and Angel for helping me out, now everyone can enjoy this. 🙂

Akhil P.

WhatsApp Image 2023-07-13 at 10.27.18 PM.jpeg

AkhilParujanwala

Angel I have tried what you stated, mind you I'm on the Out of the box Tablet WPF version and there is no problem with the code as is. I don't see points layers added on top of eachother and such as you describe.

Mind you, I do understand where you are coming from, infact I just tried to remove
nMap.MapLayers.AddRange(m_mobileCache1);

Just to see if the newly downloaded points would be added to the map, and they were, but I had to manually refersh the map.
The line of code above, I would agree is not needed, what is needed is actually Map.invalidate or Map.refresh.

However my instance of the Map object doesn't allow me to directly call upon this event (refresh or invalidate) so I can't refresh my map.

In addition ran some testing on connect and disconnected from the internet scenarios, here are the results:

1) If the application starts up with an internet connection, and stays with a internet connection my download data code works as expected.

2) If the application starts up with no internet connection, and stay with no internect connection my download data code works as expected, it doesn't download, but doesn't throw and exception either.

3) If the application starts up with an internet connection and then disconnects from the internet, the download data procedure causes the table PC to not respond for roughly 90-130 secs.
Then it will respond, but if I trigger my download data code again it will stall again, and it does not throw an error or exception.

4) If the application starts up with no internet connection but does connect to the internet at a later point, the same no response problem occurs, and it does not throw an error or exception.

In both cases 3 and 4, my try and catch segments are not working as expected and I would much rather somehow test for if there is an internet connection then download data, otherwise don't attempt to download data.

Code below:

public static void Download_DataAkhil2()
        {
            try
            {
                ESRI.ArcGIS.Mobile.WPF.Map nMap = MobileApplication.Current.Map;

                MobileCache m_mobileCache1;
                m_mobileCache1 = new MobileCache(@C:\Akhil\ArcGIS_Mobile_Projects\P_Radiation_Data_V1_B8\Radiation_Data_V1);

                MobileServiceConnection con = new MobileServiceConnection();
                con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";
                con.CreateCache(m_mobileCache1.StoragePath); // Per ESRI sample
                m_mobileCache1.Open();

                MobileCacheSyncAgent agent = new MobileCacheSyncAgent(m_mobileCache1, con);
                agent.MapDocumentConnection = con;
                agent.Synchronize(); // See if Synchronize works instead of line below             
                //agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);

                nMap.MapLayers.AddRange(m_mobileCache1);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

Overall there still needs to be 2 or 3 fixes to make this procedure perfect.
1) Properly refresh or invalidate the map, not using .AddRange(mobilecache).

2) Handle internet connection and no internet connection better.

3) May need to swtich synchronization code to use FeatureLayerSync instead.
(Just like Buddha mentioned above)

Thanks,

Akhil P.

AngelGonzalez

I use the following in my mobile app:

To test for intranet connection:


using System.Net.NetworkInformation;
using System.Text;

Private bool PingGISServer()
        {
            try
            {
                Ping pingSender = new Ping();
                PingOptions options = new PingOptions();
                options.DontFragment = true;

                // Create a buffer of data to be transmitted.
                string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                byte[] buffer = Encoding.ASCII.GetBytes(data);
                int timeout = 120;

                //First check if Intranetserver is available
                PingReply reply = pingSender.Send("severNameHere", timeout, buffer, options);

               
                if (reply.Status == IPStatus.Success)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                return false;
            }



if (PingGISServer())
{
        If true do something like upload & download data
}

************* Might be usefull - Checking for network connectivity ***********************

using System.Net.NetworkInformation;

public bool isNetWorkAvailable = NetworkInterface.GetIsNetworkAvailable();


if(isNetWorkAvailable)
{
   If true do something
}...

Hope this helps

AkhilParujanwala

Thanks Angel, that was exactly what I was looking for. I have placed comments on my code. Most noted would be the last line of code.

 nMap.MapLayers.AddRange(mobileCache); //refreshes the map, should use Map.Refresh or Map.Invalidate instead

For some reason this work, but I know for a fact it doesn't work at the same time. In hindsight this line of code causes the map to refresh, which is what I want it to do.

When/If I move to Window Mobile platform, the similar results as you stated previously may happen, where the layers would be on top of each other and duplicate the labels.

I know there Map class has Refresh and Invalidate which are suppose to be used to refresh the map. But for some reason that method is not available for me, I must be referencing the wrong Map object or not using the correct objects.

At the moment everything works perfectly. I have tested this code in all 4 scenarios as stated above and it handles them all perfectly.

Also it would be nice to get the application/project path from a property as opposed to me semi-hardcoding the path like I have.

 public static bool PingGISServer()
        {            
            try
            {
                Ping pingSender = new Ping(); 
                PingOptions options = new PingOptions();
                options.DontFragment = true;
                                
                // Create a buffer of data to be transmitted.
                string data = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
                byte[] buffer = Encoding.ASCII.GetBytes(data);
                int timeout = 2000;
                                
                //First check if Intranetserver is available
                PingReply reply = pingSender.Send("emapappdev", timeout, buffer, options);                
                               
                if (reply.Status == IPStatus.Success)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                return false;
            }
        }
       
        public static void Download_DataAkhil2()
        {
            if (PingGISServer() == true)
            {   
                try
                {
                    ESRI.ArcGIS.Mobile.WPF.Map nMap = MobileApplication.Current.Map; // instance of the Map (does not really work, but does work)                    
                    
                    string appName = MobileApplication.Current.ApplicationTitle; //gets the name of the application title to be used in cache storage path                                                           
                    appName = appName.Remove(0, 16); //removes the first 16 characters from the application title                     
                                      
                    MobileCache mobileCache = new MobileCache(@C:\NEPRD\Mobile Radiation Applications\P_ + appName + "\\Radiation_Data_V1"); 
                    
                    MobileServiceConnection con = new MobileServiceConnection(); //connection to mobile service
                    con.Url = @"http://emapappdev/arcgis/services/Test_Mobile_Services/Radiation_Data_V1/MapServer/Mobileserver";
                    con.CreateCache(mobileCache.StoragePath); // creates the cache in the storage path
                    mobileCache.Open();

                    MobileCacheSyncAgent agent = new MobileCacheSyncAgent(mobileCache, con); //create an agent to the mobile cache and service
                    agent.MapDocumentConnection = con; //sets the map document connection
                    agent.Synchronize(); //agent.DownloadExtent(m_mobileCache1.GetExtent(), 0, 0);   - alternative for downloading and synchronizing
                                        
                    nMap.MapLayers.AddRange(mobileCache); //refreshes the map, should use Map.Refresh or Map.Invalidate instead
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            }
            //else
            //{
            //    MessageBox.Show("Ping Failed!");
            //}
        }

Thanks,

Akhil P.

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