topic Re: save layer to xml file in ArcGIS API for Silverlight Questions

save layer to xml file

LedonneJuan — Thu, 22 Jul 2010 07:13:27 GMT

hi, i'm looking for a layer to xml file and load xml file as graphic layer but found nothing. somebody help me please.

thanks

Re: save layer to xml file

DominiqueBroux — Sat, 11 Dec 2021 21:14:51 GMT

I've attached C# code allowing XML serialization/deserialization of Graphics.

It's developed as an extension of GraphicsLayer:

So, in WPF, you can serialize to a file with code like:

 
string dataFile = @"graphics.xml";
using (XmlWriter writer = XmlWriter.Create(dataFile, new XmlWriterSettings() { Indent = true }))
{
  myGraphicsLayer.SerializeGraphics(writer);
  writer.Close();
}

and deserialize with :

 
myGraphicsLayer.ClearGraphics();
using (XmlReader reader = XmlReader.Create(dataFile))
{
  myGraphicsLayer.DeserializeGraphics(reader);
  reader.Close();
}

The generated XML looks like:

 
<?xml version="1.0" encoding="utf-8"?>
<Graphics xmlns:sys="http://www.w3.org/2001/XMLSchema" xmlns:esri="http://schemas.datacontract.org/2004/07/ESRI.ArcGIS.Client.Geometry" xmlns:col="http://schemas.datacontract.org/2004/07/System.Collections.Generic" xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://schemas.datacontract.org/2004/07/ESRI.ArcGIS.Client.Samples">
<Graphic>
<Attributes>
<Attribute>
<col:key>OBJECTID</col:key>
<col:value i:type="sys:int">1</col:value>
</Attribute>
<Attribute>
<col:key>Name</col:key>
<col:value i:type="sys:string">Graphic1</col:value>
</Attribute>
</Attributes>
<Geometry i:type="esri:Polygon">
<esri:spatialReference>
<esri:wkid>4326</esri:wkid>
</esri:spatialReference>
<esri:rings>
<esri:points>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>120.039</esri:x>
<esri:y>-20.303</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>142.539</esri:x>
<esri:y>-7.0137</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>163.281</esri:x>
<esri:y>-13.923</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>172.773</esri:x>
<esri:y>-35.174</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>173.594</esri:x>
<esri:y>-43.18</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>121.797</esri:x>
<esri:y>-36.032</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>120.039</esri:x>
<esri:y>-20.303</esri:y>
</esri:point>
</esri:points>
</esri:rings>
</Geometry>
</Graphic>
<Graphic>
<Attributes>
<Attribute>
<col:key>OBJECTID</col:key>
<col:value i:type="sys:int">2</col:value>
</Attribute>
<Attribute>
<col:key>Name</col:key>
<col:value i:type="sys:string">Graphic2</col:value>
</Attribute>
</Attributes>
<Geometry i:type="esri:Polygon">
<esri:spatialReference i:nil="true" />
<esri:rings>
<esri:points>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>130.039</esri:x>
<esri:y>-20.303</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>152.539</esri:x>
<esri:y>-7.0137</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>173.281</esri:x>
<esri:y>-13.923</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>179.773</esri:x>
<esri:y>-35.174</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>179.594</esri:x>
<esri:y>-43.18</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>131.797</esri:x>
<esri:y>-36.032</esri:y>
</esri:point>
<esri:point>
<esri:spatialReference i:nil="true" />
<esri:x>130.039</esri:x>
<esri:y>-20.303</esri:y>
</esri:point>
</esri:points>
</esri:rings>
</Geometry>
</Graphic>
</Graphics>

You can also use it with other kind of stream. Example in silverlight with IsolatedStorage:

 
string dataFile = @"graphics.xml";
using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream fileStream = store.CreateFile(dataFile))
{
using (XmlWriter writer = XmlWriter.Create(fileStream, new XmlWriterSettings() { Indent = true }))
{
graphicsLayer.SerializeGraphics(writer);
writer.Close();
}
fileStream.Close();
}�??

Note that the symbol is not serialized, so it's only working if there is a renderer associted to your layer or if you reset the symbols by code after the deserialization (else the grahics end up wihout any symbol and so are not rendered.

Re: save layer to xml file

LedonneJuan — Mon, 26 Jul 2010 00:56:08 GMT

Thanks a lot Dominique. That's the one I need.

God Bless 🙂

Re: save layer to xml file

XavierGuillard1 — Mon, 06 Jun 2011 11:23:20 GMT

Hi , I'm developing a MapControl Application using ARGIS Engine 9.3 .I'm wondering if it possible to serialize like you do, the IGraphicLayer or IGraphicContainer From ESRI.Arcgis.Carto to XML and also to deseralize it. I think the process is very similar to yours .

Somebody can help me please.

Thanks in advance .

Re: save layer to xml file

BKuiper — Mon, 01 Aug 2011 20:42:54 GMT

I've attached C# code allowing XML serialization/deserialization of Graphics.

It's developed as an extension of GraphicsLayer:

So, in WPF, you can serialize to a file with code like:

Great post, thanks. I started out with the XmlSerializer but switch to the DataContractSerializer because of the support within the ESRI. I also used IXmlSerializer which is a interface to overwrite the regular Xml Serialization parsing and insert your own. This helped me because i made some derived classes from GraphicsLayer and Graphics that I didn't want to change that much.

Thanks again for the great post. Hopefully the ESRI objects will be further extended so we don't need to hack our own anymore 🙂

Re: save layer to xml file

VishakhaKadam — Fri, 21 Oct 2011 14:40:04 GMT

Hi Dominique,

First of all I would like to thank you for this post. Great post!!

I have a question about it. I am using both the classes DataContracts.cs and GraphicsLayerExtension.cs.
    GraphicsLayer glayer = layer as GraphicsLayer;
                        using (XmlWriter writer = XmlWriter.Create(xmlFile+dataFile, new XmlWriterSettings() { Indent = true }))
                        {
                            glayer.SerializeGraphics(writer);
                            writer.Close();
                        }
This works fine. Please find attached xml file. However when when I use DeserilaizeGraphics method it only identifies <Geometry i:type="esri:Polygon">.

Here is my code:

ESRI.ArcGIS.Client.GraphicsLayer gfxLyr = new ESRI.ArcGIS.Client.GraphicsLayer();
   using (XmlReader testReader = XmlReader.Create(new FileStream(@"C:\Users\vkadam\Documents\CommandCore\SaveData\graphicsTest.xml", FileMode.Open)))
                        {
                            gfxLyr.DeserializeGraphics(testReader);
                            gfxLyr.ID = "test";
                            testReader.Close();

                            cont.BaseMap.Layers.Add(gfxLyr);

                            for(int n = 0; n < gfxLyr.Graphics.Count; n++)
                            {
                               Debug.WriteLine(gfxLyr.Graphics.Geometry);
/// does not show   <Geometry i:type="esri:Polyline">
                            }

Re: save layer to xml file

VishakhaKadam — Fri, 21 Oct 2011 14:44:58 GMT

Hi Dominique,

First of all I would like to thank you for this post. Great post!!

I have a question about it. I am using both the classes DataContracts.cs and GraphicsLayerExtension.cs.

Here is code for serialization of graphic:

    GraphicsLayer glayer = layer as GraphicsLayer;
                        using (XmlWriter writer = XmlWriter.Create(xmlFile+dataFile, new XmlWriterSettings() { Indent = true }))
                        {
                            glayer.SerializeGraphics(writer);
                            writer.Close();
                        }
This works fine. Please find attached xml file. However when when I use DeserilaizeGraphics method it only identifies <Geometry i:type="esri:Polygon">.

Here is my code:

ESRI.ArcGIS.Client.GraphicsLayer gfxLyr = new ESRI.ArcGIS.Client.GraphicsLayer();
   using (XmlReader testReader = XmlReader.Create(new FileStream(@"C:\Users\vkadam\Documents\CommandCore\SaveData\graphicsTest.xml", FileMode.Open)))
                        {
                            gfxLyr.DeserializeGraphics(testReader);
                            gfxLyr.ID = "test";
                            testReader.Close();

                            BaseMap.Layers.Add(gfxLyr);

                            for(int n = 0; n < gfxLyr.Graphics.Count; n++)
                            {
                               Debug.WriteLine(gfxLyr.Graphics.Geometry);
      // does not show   <Geometry i:type="esri:Polyline"> and <Geometry i:type="esri: point">
                            }

This only shows Polygon type and not <Geometry i:type="esri:Polyline"> and <Geometry i:type="esri: point>

Am I missing something ? I really appreciate your help !!

Waiting for your reply...

Thank you,

Sincerely,
Vishakha

Re: save layer to xml file

DominiqueBroux — Mon, 24 Oct 2011 07:18:43 GMT

I tested your xml file and got 11 graphics including polylines and points.

ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polyline
ESRI.ArcGIS.Client.Geometry.Polyline
ESRI.ArcGIS.Client.Geometry.Polyline
ESRI.ArcGIS.Client.Geometry.Polyline
Point[X=-11370863.6659683, Y=4344881.59797506, WKID=102100]
Point[X=-10566392.7121314, Y=4192007.05534562, WKID=102100]

How may graphics do you get?

Re: save layer to xml file

VishakhaKadam — Mon, 24 Oct 2011 13:47:26 GMT

Hi Dominique,

Here is my output:

ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon
ESRI.ArcGIS.Client.Geometry.Polygon

I am still not able to find why it is not showing all the 11 graphics items as you said. I only get the 5 items.

Please find attached class files which I am using. Please let me know what am I missing or doing incorrect.

Thank you,
Vishakha

Re: save layer to xml file

VishakhaKadam — Tue, 25 Oct 2011 20:56:14 GMT

Hi Dominique,

I found out that , it was this code showing only polygon types.

for(int n = 0; n < gfxLyr.Graphics.Count; n++)
{
Debug.WriteLine(gfxLyr.Graphics.Geometry);
// does not show <Geometry i:type="esri:Polyline"> and <Geometry i:type="esri: point">
}

Instead of using for loop, I used foreach (var graphics in gfxLyr.Graphics) and it worked !!

Thank you so much for your help!!

Sincerely,
Vishakha

Re: save layer to xml file

SujaSudhan — Tue, 17 Apr 2012 04:58:58 GMT

A very useful post, thanks!

Is there a way to filter the graphics by current extent and then add only the filtered graphics to the xml? My original graphics in the graphics layer do not come from REST service, so I can't do a query to filter them (or can I?).

In summary, How to filter the features in a graphics layer? I only want graphics in the current extent to be written to the xml.

Appreciate any guidance.

Thanks.

Re: save layer to xml file

DominiqueBroux — Sat, 11 Dec 2021 21:14:54 GMT

In summary, How to filter the features in a graphics layer? I only want graphics in the current extent to be written to the xml.

Something like:

var graphicsInCurrentExtent = graphicsLayer.Graphics.Where(g => g.Geometry.Extent.Intersects(MyMap.Extent)).ToList();

Re: save layer to xml file

SujaSudhan — Sat, 11 Dec 2021 21:14:56 GMT

Something like:

var graphicsInCurrentExtent = graphicsLayer.Graphics.Where(g => g.Geometry.Extent.Intersects(MyMap.Extent)).ToList();

Thanks for the quick reply. However, there is no "Where" property to the Graphics on the above code line. I am still struggling to find a method to filter a graphics layer, so any pointers will be useful.

Re: save layer to xml file

DominiqueBroux — Tue, 17 Apr 2012 08:58:58 GMT

Thanks for the quick reply. However, there is no "Where" property to the Graphics on the above code line. I am still struggling to find a method to filter a graphics layer, so any pointers will be useful.

'Where' is a .net LINQ method (documentation). To enable it, add : 'using System.Linq' at the beginning of your C# file.

Re: save layer to xml file

SujaSudhan — Tue, 17 Apr 2012 09:10:22 GMT

'Where' is a .net LINQ method (documentation). To enable it, add : 'using System.Linq' at the beginning of your C# file.

Thanks Dominique. I sure need to take a deep look at the LINQ!!!

Re: save layer to xml file

BehnamAtazadeh — Thu, 22 Aug 2013 05:33:53 GMT

Hi. I can serialize the graphics layer without attribute information but when I add attributes to my graphics layer, the graphics layer are not serialized and this error "Object does not match target type." happens in the this line in the GraphicsLayerExtension class. can somebody help me how to solve this? Here is my code:

         GraphicsLayer myGraphicsLayer = MyMap.Layers["myGraphicLayer"] as GraphicsLayer;

              string dataFile = @"graphics.xml";
              using (IsolatedStorageFile store = IsolatedStorageFile.GetUserStoreForApplication())
              {
                  using (IsolatedStorageFileStream fileStream = store.CreateFile(dataFile))
                  {
                      using (XmlWriter writer = XmlWriter.Create(fileStream, new XmlWriterSettings() { Indent = true }))
                      {
                          myGraphicsLayer.Graphics.SerializeGraphics(writer);
                          writer.Close();
                      }
                      fileStream.Close();
                  }
              }