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    <p>Ok, after some more digging, I've figured this out to my satisfaction. I'm binding to RelativeSource Self and then parsing the binding expression on the Text property (since this is a TextFieldMaxLength converter, I am presuming I'm working against a TextBox.</p> <p>The styling up in the resource dictionary:</p> <pre><code>&lt;Style TargetType="TextBox"&gt; &lt;Setter Property="MaxLength"&gt; &lt;Setter.Value&gt; &lt;Binding Converter="{StaticResource textFieldMaxLengthConverter}" RelativeSource="{RelativeSource Self}" /&gt; &lt;/Setter.Value&gt; &lt;/Setter&gt; &lt;/Style&gt; </code></pre> <p>The usage (basically showing nothing special needs to be done since it's all in the style):</p> <pre><code>&lt;TextBox Text="{Binding MyPropertyName.TheirPropertyName}" /&gt; </code></pre> <p>The Convert Method for the textFieldMaxLengthConverter:</p> <pre><code>public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture) { Control control = value as Control; BindingExpression be = control.GetBindingExpression(TextBox.TextProperty); if (be != null) { string boundPropertyName = be.ParentBinding.Path.Path; // .. boundPropertyName here is MyPropertyName.TheirPropertyname, do some parsing and return a value based on that } } </code></pre> <p>(Obviously my actual implementation is a bit more complex/handles unexpected input/uses reflection as per my original question's statement).</p> <p>Anyway, thought I would post this solution in case anyone else tries to do something similar, or if there might be a better way to do this than I am using.</p>
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    1. CO+1... thanks for sharing! Can you post your actual implementation of the ValueConverter?
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    2. COHi Brent. Sorry, when I asked this question I was working at a previous employer, and since I'm no longer there I can't really look up what I was using this for. I'm guessing that I probably used the value in the boundPropertyName string and did some reflection on that to see if a StringMaxLengthAttribute was applied to that property, and pulling the value off of that attribute if it was present.
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