c# - How to bind to property of object returned by converter -

i'm trying bind value, run converter on it, , display property of value. having converter directly return property want wouldn't work, need property changes tracked.

what i'm trying achieve this:

// note: following not supported wpf // 'binding' cannot set on 'source' property of type 'binding'. // 'binding' can set on dependencyproperty of dependencyobject.  text={binding textfield source={binding somevalue, converter={staticresource getobjectfromvalueconverter}}}` 

ideally, wrapped in simple markup extension.

text={l:gettextfield somevalue}

problem is, haven't been able find way other bind tag of element converter, , bind target field property follows:

tag={binding somevalue, converter={staticresource getobjectfromvalueconverter}} text={binding tag.textfield, relativesource={relativesource self}} 

this cumbersome, limited (you 1 tag field) , feels abusive. how else can go achieving want whilst monitoring changes of textfield though?

you can bind datacontext of textbox, instead of tag. make other bindings simpler:

datacontext="{binding somevalue, converter={staticresource getobjectfromvalueconverter}}" text="{binding textfield}" 

this assumes not have other bindings on textbox require inherited datacontext. example, in bindings below text2 broken:

datacontext="{binding somevalue, converter={staticresource getobjectfromvalueconverter}}" text2="{binding someothervalue, converter={staticresource getobjectfromvalueconverter}}" text="{binding textfield}" 

also, if have more complex control other textbox, datacontext controls below in logical/visual tree affected.