AutoDisposeImages Property (ImageList)

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

[DescriptionAttribute("Automatically disposes the item RasterImage objects when them item is removed from the control or when the control is disposed.")]
[CategoryAttribute("Behavior")]
public bool AutoDisposeImages {get; set;}

'Declaration
 
<DescriptionAttribute("Automatically disposes the item RasterImage objects when them item is removed from the control or when the control is disposed.")>
<CategoryAttribute("Behavior")>
Public Property AutoDisposeImages As Boolean

'Usage
 
Dim instance As ImageList
Dim value As Boolean
 
instance.AutoDisposeImages = value
 
value = instance.AutoDisposeImages

[DescriptionAttribute("Automatically disposes the item RasterImage objects when them item is removed from the control or when the control is disposed.")]
[CategoryAttribute("Behavior")]
public bool AutoDisposeImages {get; set;}

DescriptionAttribute("Automatically disposes the item RasterImage objects when them item is removed from the control or when the control is disposed.")
CategoryAttribute("Behavior")
 get_AutoDisposeImages();
 set_AutoDisposeImages(value);

[DescriptionAttribute("Automatically disposes the item RasterImage objects when them item is removed from the control or when the control is disposed.")]
[CategoryAttribute("Behavior")]
public:
property bool AutoDisposeImages {
   bool get();
   void set (    bool value);
}

Property Value

true if the Leadtools.RasterImage object in the items of this ImageList is automatically disposed when a new image is set; otherwise, false. Default value is true.

When you change the value of this property, this control iterate all the items inside it and set the RasterImageListItem.AutoDisposeImages value of each item that is of type RasterImageListItem accordingly. For more information, refer to RasterImageListItem.AutoDisposeImages.

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Public Sub ImageList_AutoDisposeImages(ByVal imageList As ImageList)
      ' Make sure the AutoDisposeImages property is set to true 
      imageList.AutoDisposeImages = True
      MessageBox.Show("Removing an item then accessing its image with AutoDisposeImages set to true")
      ' Remove the first item 
      Dim item As RasterImageListItem = CType(imageList.Items(0), RasterImageListItem)
      imageList.Items.RemoveAt(0)

      ' Try to save this item's image into a disk file 
      ' This will throw an exception since the item image has been dispose 
      ' as a result of having the AutoDisposeImages false set to true 
      Dim codecs As New RasterCodecs()
      Try
         codecs.Save(item.Image, Path.Combine(LEAD_VARS.ImagesDir, "Test.jpg"), RasterImageFormat.Jpeg, 24)
         MessageBox.Show("Image saved correctly")
      Catch ex As Exception
         MessageBox.Show(ex.Message)
      End Try

      MessageBox.Show("Removing an item then accessing its image with AutoDisposeImages set to false")

      ' Now remove the next item, this time make sure to set the 
      ' AutoDisposeImages property to false before you remove the item 
      ' from the control collection 
      item = CType(imageList.Items(0), RasterImageListItem)

      imageList.AutoDisposeImages = False
      imageList.Items.RemoveAt(0)
      imageList.AutoDisposeImages = True

      ' Try to save this item's image into a disk file 
      ' This time, this should work correcly since the control did not dispose 
      ' the item image. 
      Try
         codecs.Save(item.Image, Path.Combine(LEAD_VARS.ImagesDir, "Test.jpg"), RasterImageFormat.Jpeg, 24)
         MessageBox.Show("Image saved correctly")
      Catch ex As Exception
         MessageBox.Show(ex.Message)
      End Try

      codecs.Dispose()
   End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

public void ImageList_AutoDisposeImages(ImageList imageList)
   {
      // Make sure the AutoDisposeImages property is set to true 
      imageList.AutoDisposeImages = true;
      MessageBox.Show("Removing an item then accessing its image with AutoDisposeImages set to true");
      // Remove the first item 
      RasterImageListItem item = imageList.Items[0] as RasterImageListItem;
      imageList.Items.RemoveAt(0);

      // Try to save this item's image into a disk file 
      // This will throw an exception since the item image has been dispose 
      // as a result of having the AutoDisposeImages false set to true 
      RasterCodecs codecs = new RasterCodecs();
      try
      {
         codecs.Save(item.Image, Path.Combine(LEAD_VARS.ImagesDir, "Test.jpg"), RasterImageFormat.Jpeg, 24);
         MessageBox.Show("Image saved correctly");
      }
      catch(Exception ex)
      {
         MessageBox.Show(ex.Message);
      }

      MessageBox.Show("Removing an item then accessing its image with AutoDisposeImages set to false");

      // Now remove the next item, this time make sure to set the 
      // AutoDisposeImages property to false before you remove the item 
      // from the control collection 
      item = imageList.Items[0] as RasterImageListItem;

      imageList.AutoDisposeImages = false;
      imageList.Items.RemoveAt(0);
      imageList.AutoDisposeImages = true;

      // Try to save this item's image into a disk file 
      // This time, this should work correcly since the control did not dispose 
      // the item image. 
      try
      {
         codecs.Save(item.Image, Path.Combine(LEAD_VARS.ImagesDir, "Test.jpg"), RasterImageFormat.Jpeg, 24);
         MessageBox.Show("Image saved correctly");
      }
      catch(Exception ex)
      {
         MessageBox.Show(ex.Message);
      }

      codecs.Dispose();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

ImageList Class
ImageList Members