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POHow do you check for ONLY the Visual Studio 2010 designer (so that Blend's designer is NOT targeted) in WPF?
 

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  1. POHow do you check for ONLY the Visual Studio 2010 designer (so that Blend's designer is NOT targeted) in WPF?
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    <p>I've found that in many cases the designer in Visual Studio 2010 or in Expression Blend 4 will crash if, for example, a WPF UserControl contains a control does something in code based on the control's loaded event (like transition to a different Visual State via a call like <code>VisualStateManager.GoToState(this, "AfterLoaded", true);</code>). </p> <p>My typical approach to solving these designer crashes is use the <a href="https://stackoverflow.com/a/834332/718325"><code>DesignerProperties.GetIsInDesignMode(this)</code> approach</a> in the control's contructor:</p> <pre><code>public MyControl() { // prevent designer crashes if (DesignerProperties.GetIsInDesignMode(this)) return; Loaded += MyControlLoaded; Unloaded += MyControlUnloaded; IsVisibleChanged += MyControlIsVisibleChanged; } </code></pre> <p>This approach targets both Visual Studio 2010 and Expression Blend 4 and enables me to have my design surface visible again. However, it also removes any design-time preview that a designer might provide for me (like with the above-mentioned VSM state change on the loaded event). Blend, in particular, is able to provide that preview for me in its designer (if I switch to a different Blend tab and then switch back to the original tab I see the loaded animation run). Furthermore, with some controls that I have not yet applied the above approach to, Visual Studio 2010's designer will crash, while Blend 4's designer will not. Thus what I would like to do is check for <strong>only</strong> Visual Studio 2010's designer so that I can let Blend's designer pass through and provide its previewing abilities.</p> <p>The benefit of this ability would be that I save time by not needing to build and run the application as often (to see things like the loaded animation) since Blend's designer could give me its preview. </p>
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