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IsDisposed Property

Summary

Gets a value indicating whether the RasterImage object has been disposed of.

Syntax
C#
VB
C++
public bool IsDisposed { get; } 
Public ReadOnly Property IsDisposed As Boolean 
public: 
property bool IsDisposed { 
   bool get(); 
} 

Property Value

true if the RasterImage object has been disposed of; false, otherwise.

Remarks

When this property returns true, the RasterImage object is disposed of and can no longer be referenced as a valid object. Even though the instance of an object is disposed of, it is still maintained in memory until it is removed from memory through garbage collection. When an object is disposed, you should not check any other properties or call any other methods in the control or an NullReferenceException error will occur.

If it is required to track when a RasterImage object is disposed, use the Disposed event.

The RasterImage class implements the IDisposable interface, it is recommended that you follow the standard .NET dispose pattern when using the RasterImage class. For more information, refer to the IDisposable interface documentation in MSDN.

Example

This example will show the use of the IsDisposed property of a RasterImage object.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Dicom; 
using Leadtools.Drawing; 
using Leadtools.Controls; 
using LeadtoolsExamples.Common; 
using Leadtools.Svg; 
 
public void IsDisposedTest() 
{ 
   // Create a RasterImage objects 
   RasterImage image = new RasterImage( 
      RasterMemoryFlags.Conventional, 
      100, 
      100, 
      24, 
      RasterByteOrder.Bgr, 
      RasterViewPerspective.TopLeft, 
      null, 
      IntPtr.Zero, 
      0); 
 
   // Check the IsDisposed property, should be false 
   Assert.IsTrue(!image.IsDisposed); 
   MessageBox.Show("IsDisposed = " + image.IsDisposed.ToString()); 
 
   // Now dispose the image 
   image.Dispose(); 
 
   // Re-check the IsDisposed property, should be true 
   Assert.IsTrue(image.IsDisposed); 
   MessageBox.Show("IsDisposed = " + image.IsDisposed.ToString()); 
} 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Controls 
Imports Leadtools.Dicom 
Imports Leadtools.Drawing 
Imports Leadtools.Svg 
 
Public Sub IsDisposedTest() 
   ' Create a RasterImage objects 
   Dim image As New RasterImage( 
      RasterMemoryFlags.Conventional, 
      100, 
      100, 
      24, 
      RasterByteOrder.Bgr, 
      RasterViewPerspective.TopLeft, 
      Nothing, 
      IntPtr.Zero, 
      0) 
 
   ' Check the IsDisposed property, should be false 
   Debug.Assert(Not image.IsDisposed) 
   MessageBox.Show("IsDisposed = " + image.IsDisposed.ToString()) 
 
   ' Now dispose the image 
   image.Dispose() 
 
   ' Re-check the IsDisposed property, should be true 
   Debug.Assert(image.IsDisposed) 
   MessageBox.Show("IsDisposed = " + image.IsDisposed.ToString()) 
End Sub 
c#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.Dicom; 
using Leadtools.ImageProcessing; 
using Leadtools.ImageProcessing.Core; 
using Leadtools.ImageProcessing.Color; 
using Leadtools.Examples; 
using Leadtools.Windows.Media; 
 
public void IsDisposedTest() 
{ 
   // Create a RasterImage objects 
   RasterImage image = new RasterImage( 
      RasterMemoryFlags.Conventional, 
      100, 
      100, 
      24, 
      RasterByteOrder.Bgr, 
      RasterViewPerspective.TopLeft, 
      null, 
      null, 
      0); 
 
   // Check the IsDisposed property, should be false 
   Debug.Assert(!image.IsDisposed); 
   Debug.WriteLine("IsDisposed = " + image.IsDisposed.ToString()); 
 
   // Now dispose the image 
   image.Dispose(); 
 
   // Re-check the IsDisposed property, should be true 
   Debug.Assert(image.IsDisposed); 
   Debug.WriteLine("IsDisposed = " + image.IsDisposed.ToString()); 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.Dicom 
Imports Leadtools.ImageProcessing 
Imports Leadtools.ImageProcessing.Core 
Imports Leadtools.ImageProcessing.Color 
Imports Leadtools.Windows.Media 
 
Public Sub IsDisposedTest() 
   ' Create a RasterImage objects 
   Dim image As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 100, 100, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, Nothing, 0) 
 
   ' Check the IsDisposed property, should be false 
   Debug.Assert((Not image.IsDisposed)) 
   Debug.WriteLine("IsDisposed = " & image.IsDisposed.ToString()) 
 
   ' Now dispose the image 
   image.Dispose() 
 
   ' Re-check the IsDisposed property, should be true 
   Debug.Assert(image.IsDisposed) 
   Debug.WriteLine("IsDisposed = " & image.IsDisposed.ToString()) 
End Sub 

Requirements

Target Platforms

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