C#•3w ago

WPF - Custom Control Help

See attached files, the template binding to FlyoutDirection is not working. I am getting this exception:

System.Windows.Markup.XamlParseException
  HResult=0x80131501
  Message='Set property 'System.Windows.Condition.Binding' threw an exception.' Line number '46' and line position '34'.
  Source=<Cannot evaluate the exception source>
  StackTrace:
<Cannot evaluate the exception stack trace>

  This exception was originally thrown at this call stack:
    [External Code]

Inner Exception 1:
InvalidCastException: Unable to cast object of type 'System.Windows.TemplateBindingExpression' to type 'System.Windows.Data.BindingBase'.

System.Windows.Markup.XamlParseException
  HResult=0x80131501
  Message='Set property 'System.Windows.Condition.Binding' threw an exception.' Line number '46' and line position '34'.
  Source=<Cannot evaluate the exception source>
  StackTrace:
<Cannot evaluate the exception stack trace>

  This exception was originally thrown at this call stack:
    [External Code]

Inner Exception 1:
InvalidCastException: Unable to cast object of type 'System.Windows.TemplateBindingExpression' to type 'System.Windows.Data.BindingBase'.

ContextMenuFlyout.xa...

2 Replies

nathanAjacobsOP•3w ago

Ohh I just need to specify it like this without binding:

<Condition Property="FlyoutDirection" Value="Above" />

<Condition Property="FlyoutDirection" Value="Above" />

I guess I'm just confused on when to use TemplateBinding

lycian•3w ago

One of the easiest ways to think about it is from the description:

A TemplateBinding is an optimized form of a Binding for template scenarios, analogous to a Binding constructed with {Binding RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}

A TemplateBinding is an optimized form of a Binding for template scenarios, analogous to a Binding constructed with {Binding RelativeSource={RelativeSource TemplatedParent}, Mode=OneWay}

In the case you're trying to do you're using a binding for a property name. It doesn't make sense for that.

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WPF - Custom Control Help