IsDisposed Property

C#
Visual Basic
WinRT C#
Java
Objective-C
WinRT JavaScript
C++

public bool IsDisposed {get;}

'Declaration

Public ReadOnly Property IsDisposed As Boolean

'Usage

Dim instance As RasterImage
Dim value As Boolean
 
value = instance.IsDisposed

public bool IsDisposed {get;}

 get_IsDisposed();

public:
property bool IsDisposed {
   bool get();
}

Property Value

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

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.

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

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

Copy Code

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

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 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());
}

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());
}

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

Target Platforms

Reference

RasterImage Class
RasterImage Members