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POWPF Dictionary Binding failure is very slow
 

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    <p>I have most of the <code>Label</code> objects in my app bound such that they can be replaced from a webservice. </p> <p>I store my replacements in a Dictionary. The replacements vary based on the Client that loaded for the app.</p> <p>The problem I am having is that most of the time I don't replace the labels, and the binding failure is throwing an exception that is very slow.</p> <p>Here is an example: <em>(Note this code functions correctly, it is just slow if it can't find a match.)</em></p> <pre><code>&lt;Label Content="_Gender" Helpers:CaptionHelper.PropertyName="Content" Helpers:CaptionHelper.PropertyValue="{Binding Labels[Gender], FallbackValue=_Gender}" Target="{Binding ElementName=cbGender}" /&gt; </code></pre> <p>When the binding tries to lookup Lables[Gender], I get this in my output window:</p> <pre class="lang-none prettyprint-override"><code>System.Windows.Data Warning: 17 : Cannot get 'Item[]' value (type 'String') from 'Labels' (type 'Dictionary`2'). BindingExpression:Path=Labels[Gender]; DataItem='MyViewMV' (HashCode=63776763); target element is 'Label' (Name=''); target property is 'PropertyValue'(type 'String') TargetInvocationException:'System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---&gt; System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. at System.Collections.Generic.Dictionary`2.get_Item(TKey key) --- End of inner exception stack trace --- at System.RuntimeMethodHandle._InvokeMethodFast(Params Truncated) at System.Reflection.RuntimeMethodInfo.Invoke(Params Truncated) at System.Reflection.RuntimeMethodInfo.Invoke(Params Truncated) at MS.Internal.Data.PropertyPathWorker.GetValue(Params Truncated) at MS.Internal.Data.PropertyPathWorker.RawValue(Params Truncated)' </code></pre> <p>Since I have a lot of these, it is taking about a full second to run through them all.</p> <p>Is there a way to make the binding not throw an exception when the dictionary look up fails? Or somehow fail quicker?</p>
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