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Update TaskDialog.cs #5

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Update TaskDialog.cs #5

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15 changes: 13 additions & 2 deletions src/TaskDialogLib/TaskDialog.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,9 @@ public class TaskDialog : DependencyObject
Boolean sizeToContent;
Boolean useDefaultIcon;
Boolean verificationChecked;

// This needs to be a class member so that GC doesn't free it prematurely.
TaskDialogCallbackProc callback;

IconHandle iconHandle;
IconHandle footerIconHandle;
Expand Down Expand Up @@ -165,7 +168,7 @@ public class TaskDialog : DependencyObject

#endregion

#region Constructors
#region Constructors and Destructors

/// <summary>
/// Initializes a new instance of the TaskDialog class.
Expand All @@ -178,6 +181,14 @@ public TaskDialog()
useDefaultIcon = true;
}

/// <summary>
/// Cleans up the TaskDialog class.
/// </summary>
~TaskDialog()
{
callback = null;
}

#endregion

#region Events
Expand Down Expand Up @@ -762,7 +773,7 @@ public TaskDialogResult Show()
NativeMethods.TASKDIALOGCONFIG taskDialogConfig = new NativeMethods.TASKDIALOGCONFIG();
taskDialogConfig.cbSize = (UInt32)Marshal.SizeOf(typeof(NativeMethods.TASKDIALOGCONFIG));
taskDialogConfig.hInstance = NativeMethods.GetModuleHandle();
taskDialogConfig.pfCallback = TaskDialogProc;
taskDialogConfig.pfCallback = callback = TaskDialogProc;

Debug.Assert(taskDialogConfig.hInstance != IntPtr.Zero);

Expand Down