c# - 'System.Windows.Data.MultiBinding' is not a valid value for property 'Text' -

I am trying to write a custom markup extension that defines me as my own The mechanism of using a binding, but when I try to return my markup extension to multibimbing , I get the exception exception above.

I have:

> & lt; TextBlock Text = "{my: CustomMarkup ...}" />

custom markup a multi-binding , but apparently on text to Does not like to set> MultiBinding . How does this work when I say:

  & lt; TextBlock & gt; & Lt; TextBlock.Text & gt; & Lt; Multibinding ... /> & Lt; /TextBlock.Text> & Lt; / TextBlock & gt;  

But the way I am doing does not work?

Do not return yourself to multibind instead, multibinding Return results Provider pricing .

BTW, what are you doing in your markup extension? If you do not need to override the ProvideValue , then you may be hereditary with the multibide (which is sealed). You can achieve almost anything by setting the appropriate converter and other properties