ArcGIS API for Silverlight - Library Reference
BandIds Property
See Also  Example Send comments on this topic
ESRI.ArcGIS.Client Namespace > ArcGISImageServiceLayer Class : BandIds Property

Gets or sets which bands will be displayed (or visible) by the ArcGISImageServiceLayer.

Syntax

Visual Basic (Declaration) 
Public Property BandIds As Integer()
C# 
public int[] BandIds {get; set;}

Remarks

If there are multiple bands, you can either specify a single band to export, or you can change the band combination (red, green, blue) by specifying the band number, for example, [2, 1, 3].

Images are made up of one or more bands. Each band has a single measurable characteristic (such as temperature, elevation, electromagnetic spectrum value, etc.) per pixel.

Typically all of the bands are visible (turned on) by default in the ArcGIS Server service. If the BandIds property is not set in the code-behind the getter (Read) will show the BandIds coming back as Nothing/null.

Theoretical information related to imagery can be found for the following topics:

Example

C#Copy Code
private void MainPage_Loaded(object sender, System.Windows.RoutedEventArgs e)
{
                
  // The Map1 object (a Map object) was defined previously in XAML.
                
  // Create an ArcGISImageServiceLayer.
  ESRI.ArcGIS.Client.ArcGISImageServiceLayer myArcGISImageServiceLayer = new ESRI.ArcGIS.Client.ArcGISImageServiceLayer();
  myArcGISImageServiceLayer.Url = "http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Portland/CascadeLandsat/ImageServer";
                
  // Control which individual bands are visible by setting the BandId's property.
  // In this example the ArcGISImageService has 4 bands available but only the 1st and 2nd bands will
  // be specified (Write) as visible. 
  int[] myBandIds = { 0, 1 };
  myArcGISImageServiceLayer.BandIds = myBandIds;
                
  // Create an Event Handler.
  myArcGISImageServiceLayer.Initialized += new System.EventHandler<EventArgs%gt;(ArcGISImageServiceLayer_Intialized);
                
  // Add the ArcGISImageServiceLayer to the LayerCollection of the Map.
  Map1.Layers.Add(myArcGISImageServiceLayer);
                
}
                
private void ArcGISImageServiceLayer_Intialized(object sender, EventArgs e)
{
                
  // The Map1 object (a Map object) and TextBlock_BandIds (a TextBlock object) were defined previously in XAML.
                
  // Access a specific ArcGISImageServiceLayer.
  ESRI.ArcGIS.Client.ArcGISImageServiceLayer myArcGISImageServiceLayer = (ESRI.ArcGIS.Client.ArcGISImageServiceLayer)Map1.Layers[0];
                
  // BandIds Property (Read/Write).
                
  // Use the getter (Read) to obtain an Integer Array of band ids that are visible.
  int[] myBandIds = myArcGISImageServiceLayer.BandIds;
                
  if (myBandIds != null)
  {
    // Specific BandIds have been set.
    string myBandIdsText = "Num BandIds: " + myBandIds.Length.ToString();
    string myBandIdsText2 = "";
    int i = 0;
    for (i = 0; i < myBandIds.Length; i++)
    {
      myBandIdsText2 = myBandIdsText2 + " " + myBandIds[i].ToString();
    }
                
    // Display the number of BandIds set and which one.
    TextBlock_BandIds.Text = myBandIdsText + ". Bands: " + myBandIdsText2;
  }
  else
  {
    // Typically all of the bands are visible (turned on) by default in the ArcGIS Server service.
    // If the BandIds property is not set in the code-behind the getter (Read) will show the BandIds 
    // coming back as Nothing/null.
    TextBlock_BandIds.Text = "[NO BandIds SET]";
  }
  
}
VB.NETCopy Code
Private Sub MainPage_Loaded(ByVal sender As Object, ByVal e As System.Windows.RoutedEventArgs) Handles Me.Loaded
                
  ' The Map1 object (a Map object) was defined previously in XAML.
                
  ' Create an ArcGISImageServiceLayer.
  Dim myArcGISImageServiceLayer As New ESRI.ArcGIS.Client.ArcGISImageServiceLayer
  myArcGISImageServiceLayer.Url = "http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Portland/CascadeLandsat/ImageServer"
                
  ' Control which individual bands are visible by setting the BandId's property.
  ' In this example the ArcGISImageService has 4 bands available but only the 1st and 2nd bands will
  ' be specified (Write) as visible. 
  Dim myBandIds() As Integer = {0, 1}
  myArcGISImageServiceLayer.BandIds = myBandIds
                
  ' Create an Event Handler.
  AddHandler myArcGISImageServiceLayer.Initialized, AddressOf ArcGISImageServiceLayer_Intialized
                
  ' Add the ArcGISImageServiceLayer to the LayerCollection of the Map.
  Map1.Layers.Add(myArcGISImageServiceLayer)
                
End Sub
                
Private Sub ArcGISImageServiceLayer_Intialized(ByVal sender As Object, ByVal e As EventArgs)
                
  ' The Map1 object (a Map object) and TextBlock_BandIds (a TextBlock object) were defined previously in XAML.
                
  ' Access a specific ArcGISImageServiceLayer.
  Dim myArcGISImageServiceLayer As ESRI.ArcGIS.Client.ArcGISImageServiceLayer = Map1.Layers.Item(0)
 
  ' BandIds Property (Read/Write).
  
  ' Use the getter (Read) to obtain an Integer Array of band ids that are visible.
  Dim myBandIds() As Integer = myArcGISImageServiceLayer.BandIds
                
  If myBandIds IsNot Nothing Then
                
    ' Specific BandIds have been set.
    Dim myBandIdsText As String = "Num BandIds: " + myBandIds.Length.ToString
    Dim myBandIdsText2 As String = ""
    Dim i As Integer
    For i = 0 To myBandIds.Length - 1
      myBandIdsText2 = myBandIdsText2 + " " + myBandIds(i).ToString
    Next
                
    ' Display the number of BandIds set and which one.
    TextBlock_BandIds.Text = myBandIdsText + ". Bands: " + myBandIdsText2
                
  Else
                
    ' Typically all of the bands are visible (turned on) by default in the ArcGIS Server service.
    ' If the BandIds property is not set in the code-behind the getter (Read) will show the BandIds 
    ' coming back as Nothing/null.
                
    TextBlock_BandIds.Text = "[NO BandIds SET]"
                
  End If
  
End Sub

Requirements

Target Platforms: Windows XP Professional, Windows Server 2003 family, Windows Vista, Windows Server 2008 family, Windows 7

See Also

© ESRI, Inc. All Rights Reserved.