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POThe calling thread cannot access this object because a different thread owns it
 

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  1. POThe calling thread cannot access this object because a different thread owns it
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    <p>Why I can't create CroppedBitmap in the following code? I got an exception:</p> <blockquote> <p>The calling thread cannot access this object because a different thread owns it.</p> </blockquote> <p>If I change the code to </p> <pre><code>CroppedBitmap cb = new CroppedBitmap(new WriteableBitmap(bf), new Int32Rect(1, 1, 5, 5)); </code></pre> <p>the exception is gone? why ?</p> <p>Code 1, an exception at <code>cb.Freeze()</code>:</p> <pre><code>public MainWindow() { InitializeComponent(); ThreadPool.QueueUserWorkItem((o) =&gt; { //load a large image file var bf = BitmapFrame.Create( new Uri("D:\\1172735642.jpg"), BitmapCreateOptions.None, BitmapCacheOption.None); bf.Freeze(); Dispatcher.BeginInvoke( new Action(() =&gt; { CroppedBitmap cb = new CroppedBitmap(bf, new Int32Rect(1,1,5,5)); cb.Freeze(); //set Image's source to cb.... }), DispatcherPriority.ApplicationIdle); } ); } </code></pre> <p>Code 2, works:</p> <pre><code> ThreadPool.QueueUserWorkItem((o) =&gt; { var bf = BitmapFrame.Create( new Uri("D:\\1172740755.jpg"), BitmapCreateOptions.None, //BitmapCreateOptions.DelayCreation, BitmapCacheOption.None); bf.Freeze(); var wb = new WriteableBitmap(bf); wb.Freeze(); this.Dispatcher.Invoke( new Action(() =&gt; { var r = new Int32Rect(1, 1, 5, 5); CroppedBitmap cb = new CroppedBitmap(wb, r); cb.Freeze(); //set Image's source to cb.... Image.Source = cb; }), DispatcherPriority.ApplicationIdle); } ); </code></pre> <p>Code 3, works without WritableBitmap:</p> <pre><code>ThreadPool.QueueUserWorkItem((o) =&gt; { var bf = BitmapFrame.Create( new Uri("D:\\1172735642.jpg"), BitmapCreateOptions.None, //BitmapCreateOptions.DelayCreation, BitmapCacheOption.None); bf.Freeze(); var bf2 = BitmapFrame.Create(bf); bf2.Freeze(); this.Dispatcher.Invoke( new Action(() =&gt; { var r = new Int32Rect(1, 1, 5, 5); BitmapSource cb = new CroppedBitmap(bf2, r); cb.Freeze(); //set Image's source to cb.... Image.Source = cb; }), DispatcherPriority.ApplicationIdle); } ); </code></pre>
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    1. This table or related slice is empty.
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    1. USzunyite
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    1. This table or related slice is empty.
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      1. POThe calling thread cannot access this object because a different thread owns it
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      1. POThe calling thread cannot access this object because a different thread owns it
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    1. CO`BitmapFrame` smells like a UI class, and it's being created on a worker thread, and then used on the UI thread...
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      1. POThe calling thread cannot access this object because a different thread owns it
      1. USAviad P.
 

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