c# - TextBlock GetBindingExpression gets Null when text binded from resource file -

i have text block in text binded resource file,all works fine getbindingexpression return null. there other way of binding

<textblock x:name="slide"                        text="{x:static prop:resources.slidetocollect}"/>  slide.getbindingexpression(textblock.textproperty) 

x:static - not binding, , not creates bindingexpression instances. x:static - it wpf markup extension, allows reference static by-value code entity defined in cls–compliant way. in case - value resource.slidetocollect static property(or field, or constant, etc.) of resource class , assign text property of textblock.

if want use binding, need binding markup extension. here example code:

<window  x:class="wpfapplication66.mainwindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"   xmlns:app="clr-namespace:wpfapplication66" title="mainwindow" height="350" width="525" > <window.resources>     <app:resources x:key="resources"/> </window.resources> <grid>     <textblock x:name="slide" text="{binding slidetocollect, source={staticresource resources}}"/> </grid> 

and code behind window:

public class resources {     public string slidetocollect { { return "i'am slidetocollect"; } } }  public partial class mainwindow : window {     public mainwindow()     {         initializecomponent();          bindingexpression = slide.getbindingexpression(textblock.textproperty);     } } 

now, variable "be" assigned instance of bindingexpression class. don't forget replace wpfapplication66 project name ;)