Latest Contributions by DarinaTchountcheva

Hi Ann, One way to acheive this could be using Dependancy Property in your UserControl: #region Dependancy Properties         protected static readonly DependencyProperty MapProperty=             DependencyProperty.Register("Map", typeof(Map), typeof(YourUserControlName), new PropertyMetadata(OnMapPropertyChanged));         public Map Map         {             get { return (Map)this.GetValue(MapProperty); }             set             {                 this.SetValue(MapProperty, (DependencyObject)value);                            }         }         private static void OnMapPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)         {             (d as YourUserControlName).PopulateLayerList();         }         private void PopulateLayerList()         {                       if (this.Map != null)             {                                                      //populate your layer list here             }         }         #endregion       Then your UserControl declaration in xaml will be: [HTML] <local:WidgetControl x:Name="MyWidget" Map="{Binding ElementName=MyMap}"/> [/HTML] I haven't tested it your scenario and there might be a better approach, but it might be worth trying. Good Luck! ... View more

Hi Charlie, Thank you for your post! I have experienced the same behavior with the ArcGISDynamicMapServiceLayer last Friday. I am programmatically changing Opacity, VisibleLayers and LayerDefinitions, calling Refresh after that. After a few calls to the Refresh the memory consumptions jumps very high, and the application becomes unusable, or very slow. I had to change my design and avoid using the ArcGISDynamicMapServiceLayer - it was possible in my scenario. Hope, this will be resolved soon! ... View more

Hi Kevin, If nothing else works, try the script in this thread, it works for me (I scheduled it to run every 15 minutes): http://forums.esri.com/Thread.asp?c=158&f=2276&t=228654&mc=137#812067 Good Luck! ... View more

Hello xaria, Here is a sample, that you can see in the Symbol Gallery: [HTML] <esri:MarkerSymbol x:Name="CustomSelectRectangleMarkerSymbol" OffsetX="10" OffsetY="10">     <esri:MarkerSymbol.ControlTemplate>       <ControlTemplate>         <Grid Width="20" Height="20" x:Name="RootElement">           <vsm:VisualStateManager.VisualStateGroups>             <vsm:VisualStateGroup x:Name="CommonStates">               <vsm:VisualState x:Name="MouseOver" />               <vsm:VisualState x:Name="Normal" />             </vsm:VisualStateGroup>             <vsm:VisualStateGroup x:Name="SelectionStates">               <vsm:VisualState x:Name="Selected">                 <Storyboard>                   <ColorAnimation BeginTime="00:00:00" Storyboard.TargetName="myrectangle" Storyboard.TargetProperty="(Rectangle.Stroke).(SolidColorBrush.Color)" To="Red" Duration="0:0:.25" />                   <DoubleAnimationUsingKeyFrames Storyboard.TargetName="myrectangle" Storyboard.TargetProperty="StrokeThickness" Duration="0:0:.5" RepeatBehavior="Forever">                     <LinearDoubleKeyFrame KeyTime="0" Value="3" />                     <LinearDoubleKeyFrame KeyTime="00:00:0.25" Value="1" />                     <LinearDoubleKeyFrame KeyTime="00:00:0.5" Value="3" />                   </DoubleAnimationUsingKeyFrames>                 </Storyboard>               </vsm:VisualState>               <vsm:VisualState x:Name="Unselected" />             </vsm:VisualStateGroup>           </vsm:VisualStateManager.VisualStateGroups>           <Rectangle x:Name="myrectangle" RadiusX="4" RadiusY="4" Fill="White" Cursor="Hand" Stroke="Blue" StrokeThickness="3" />         </Grid>       </ControlTemplate>     </esri:MarkerSymbol.ControlTemplate>   </esri:MarkerSymbol>  [/HTML] Look at the SelectionStates - Selected and Unselected. And here is the link to the Gallery, so you can find some other samples: http://help.arcgis.com/en/webapi/silverlight/samples/SymbolGalleryWeb/start.htm Good Luck! ... View more

Hi Shaning, I think you are seeing an issue with the OverviewMap discussed in this forum: http://forums.arcgis.com/threads/10033-Overview-map-does-not-show-contents-until-after-view-extent-changed?highlight=overviewmap I am looking for a workaround of the same issue. Hope, someone has already found it. 🙂 I will post back when I come up with a solution. ... View more

Yes. Well, I wanted an easy answer, but the message needs to have more than 10 characters. 😄 ... View more

Hi bpangtay, Yes, you can change the where clause of the FeatureLayer at runtime. All you have to do is: FeatureLayer fLayer = Map.Layers["queryLayer"] as FeatureLayer; string where = "STATE_NAME LIKE 'NORTH%'"; //set the where clause of the feature layer fLayer.Where = where; fLayer.Update(); And if you need to manipulate the Graphics on the layer after they have been updated, you can handle the UpdateCompleted event. Good Luck! ... View more

Hi Russel, I am using the aliases to show more meaningful field names in DataGrids, MapTips, ... //The parameter "aliases" is a Dictonary<string, string> and you can hardcode it, //get the data form XML config file, or from a database. //Here is how you can create it: Dictionary<string, string> aliases = new Dictionary<string, string>(); aliases.Add("OriginalFieldName1", "FieldNameAlias1"); aliases.Add("OriginalFieldName2", "FieldNameAlias2"); aliases.Add("OriginalFieldName3", "FieldNameAlias3"); aliases.Add("OriginalFieldName4", "FieldNameAlias4");  This will only work though if your DataGrid has the same aliases as headers. And here is where my code doesn't work, because I always use Aliases, and I did not cover the scenario when Aliases are not used. (Sorry, my bad). I don't have time to do any testing, but try to add the "if statement" below, and see if it will work with no aliases (see the comments): foreach (Graphic data in dGrid.ItemsSource)                 {                     lstFields.Clear();                     foreach (DataGridColumn col in dGrid.Columns)                     {                         string strValue = string.Empty;                         string dataField = string.Empty;                         // Add this if statement                         if (aliases == null)                         {                             dataField = col.Header.ToString();                         }                         else                         {                             foreach (KeyValuePair<string, string> kv in aliases)                             {                                 if (col.Header.ToString() == kv.Value)                                 {                                     dataField = kv.Key;                                     break;                                 }                             }                         }                         // End if statement                         if (excludedColumns != null)                         {                             foreach (string columnName in excludedColumns)                             {                                 if (col.Header.ToString() == columnName)                                     continue;                                 else                                     strValue = data.Attributes[dataField].ToString();                                                            }                         }                         else                             strValue = data.Attributes[dataField].ToString();                                                                            lstFields.Add(FormatField(strValue, strFormat));                     }                     BuildStringOfRow(strBuilder, lstFields, strFormat);                 } Then you can change the call: YourNamespace.DataGridExtensions.ExportDataGrid(theGrid, null, null); And you can do this if your DataGrid displays the real field names. If the code fix doesn't work, try creating the aliases parameter with the same OriginalFieldName and FieldNameAlias just to see if it will work. I will go back and simplify this method when I get a chance. Gotta go! Good Luck! ... View more

Hi Russel, I have used the first link to export DataGrid to Excel. I have modified the code to work for Graphics data. public static class DataGridExtensions     {         public static void Export(this DataGrid dg, List<string> excludedColumns, Dictionary<string, string> aliases)         {             ExportDataGrid(dg, excludedColumns, aliases);         }         public static void ExportDataGrid(DataGrid dGrid, List<string> excludedColumns, Dictionary<string, string> aliases)         {             SaveFileDialog objSFD = new SaveFileDialog() { DefaultExt = "csv", Filter = "CSV Files (*.csv)|*.csv|Excel XML (*.xml)|*.xml|All files (*.*)|*.*", FilterIndex = 1 };             if (objSFD.ShowDialog() == true)             {                 string strFormat = objSFD.SafeFileName.Substring(objSFD.SafeFileName.IndexOf('.') + 1).ToUpper();                 StringBuilder strBuilder = new StringBuilder();                 if (dGrid.ItemsSource == null) return;                 List<string> lstFields = new List<string>();                 if (dGrid.HeadersVisibility == DataGridHeadersVisibility.Column || dGrid.HeadersVisibility == DataGridHeadersVisibility.All)                 {                     foreach (DataGridColumn dgcol in dGrid.Columns)                     {                         if (excludedColumns != null)                         {                             foreach (string columnName in excludedColumns)                             {                                 if (dgcol.Header.ToString() == columnName)                                 {                                     continue;                                 }                                 else                                 {                                     lstFields.Add(FormatField(dgcol.Header.ToString(), strFormat));                                 }                             }                         }                         else                             lstFields.Add(FormatField(dgcol.Header.ToString(), strFormat));                     }                     BuildStringOfRow(strBuilder, lstFields, strFormat);                 }                 foreach (Graphic data in dGrid.ItemsSource)                 {                     lstFields.Clear();                     foreach (DataGridColumn col in dGrid.Columns)                     {                         string strValue = string.Empty;                         string dataField = string.Empty;                         foreach (KeyValuePair<string, string> kv in aliases)                         {                             if (col.Header.ToString() == kv.Value)                             {                                 dataField = kv.Key;                                 break;                             }                         }                         if (excludedColumns != null)                         {                             foreach (string columnName in excludedColumns)                             {                                 if (col.Header.ToString() == columnName)                                     continue;                                 else                                     strValue = data.Attributes[dataField].ToString();                                                            }                         }                         else                             strValue = data.Attributes[dataField].ToString();                                                                            lstFields.Add(FormatField(strValue, strFormat));                     }                     BuildStringOfRow(strBuilder, lstFields, strFormat);                 }                 StreamWriter sw = new StreamWriter(objSFD.OpenFile());                 if (strFormat == "XML")                 {                     //Let us write the headers for the Excel XML                     sw.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\"?>");                     sw.WriteLine("<?mso-application progid=\"Excel.Sheet\"?>");                     sw.WriteLine("<Workbook xmlns=\"urn:schemas-microsoft-com:office:spreadsheet\">");                     sw.WriteLine("<DocumentProperties xmlns=\"urn:schemas-microsoft-com:office:office\">");                     sw.WriteLine("<Author>Arasu Elango</Author>");                     sw.WriteLine("<Created>" + DateTime.Now.ToLocalTime().ToLongDateString() + "</Created>");                     sw.WriteLine("<LastSaved>" + DateTime.Now.ToLocalTime().ToLongDateString() + "</LastSaved>");                     sw.WriteLine("<Company>Atom8 IT Solutions (P) Ltd.,</Company>");                     sw.WriteLine("<Version>12.00</Version>");                     sw.WriteLine("</DocumentProperties>");                     sw.WriteLine("<Worksheet ss:Name=\"Silverlight Export\" xmlns:ss=\"urn:schemas-microsoft-com:office:spreadsheet\">");                     sw.WriteLine("<Table>");                 }                 sw.Write(strBuilder.ToString());                 if (strFormat == "XML")                 {                     sw.WriteLine("</Table>");                     sw.WriteLine("</Worksheet>");                     sw.WriteLine("</Workbook>");                 }                 sw.Close();             }         }         private static void BuildStringOfRow(StringBuilder strBuilder, List<string> lstFields, string strFormat)         {             switch (strFormat)             {                 case "XML":                     strBuilder.AppendLine("<Row>");                     strBuilder.AppendLine(String.Join("\r\n", lstFields.ToArray()));                     strBuilder.AppendLine("</Row>");                     break;                 case "CSV":                     strBuilder.AppendLine(String.Join(",", lstFields.ToArray()));                     break;             }         }         private static string FormatField(string data, string format)         {             switch (format)             {                 case "XML":                     return String.Format("<Cell><Data ss:Type=\"String\">{0}</Data></Cell>", data);                 case "CSV":                     return String.Format("\"{0}\"", data.Replace("\"", "\"\"\"").Replace("\n", "").Replace("\r", ""));             }             return data;         }     } And then in your Export button click event handler call this method: YourNamespace.DataGridExtensions.ExportDataGrid(theGrid, null, aliases); Where: - theGrid is the DataGrid with the data to be exported - null is for excludedColumns (I just needed to not export some of the columns) - aliases is a Dictionary<string, string>, where the key is the real Field Name, and value is the Field Alias that I have used to display in the DataGrid headers Good Luck! ... View more

Hi Morten, Thank  your for your suggestion. If I don't call Update() it ignores my Where clause and loads all the features on the map, and that is not what I want. It is working for now, and I have just fixed all of the other breaking errors from the conversion.  I will break it another time for more testing. 😉 ... View more

OK, I spoke too soon! I had to move the code that was calling the Update method to the FeatureLayer Initialized event, because now that was creating it in code, it was not initialized at the moment when I was calling the method before. Problem resolved, but I don't know why the new version wouldn't allow FeatureLayer's Url to be set after it has been initialized. I personally use configuration files to set all of the services' URLs, so I don't have to rebuild and redeploy every time I change a service Url. ... View more

Hi Stephen, Have you resolved your problems? I am getting the same errors trying to upgrade an application from 1.2 to 2.0. I cannot set the Url of a FeatureLayer after it has been initialized, so I create the layer in code behind. But then I get an "Object not set to an instance" error on the line where I call the Update method: fLayer.Update() And fLayer is not null, but a valid FeatureLayer object. Any thoughts and ideas are greatly appreciated. ... View more

Hi Jacek, Here is how you set up a proxy page: http://help.arcgis.com/en/webapi/silverlight/help/Secure_services.htm It is under "Using ArcGIS Server" topic in the Silverlight API help: http://help.arcgis.com/en/webapi/silverlight/help/index.html Once you set up your proxy page (config and ashx), add proxyUrl to your services. I haven't used proxy page for your purpose, but I it is worth to give it a try. I think, it will work. Good Luck! ... View more

Hi Rouf, It sounds like you are looking for the FullExtent property of the GraphicsLayer/FeatureLayer. http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.GraphicsLayer_members.html Here is a link to the Silverligth API reference: http://help.arcgis.com/en/webapi/silverlight/apiref/api_start.htm Good Luck! ... View more