c# - how to bind the button content where mouse selection is start - 


<window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" x:class="storyboard.clear" x:name="window" title="clear" width="640" height="480">  <grid x:name="layoutroot">     <button x:name="btn_a" content="a" height="56" margin="208,149,0,0" verticalalignment="top" horizontalalignment="left" width="75" click="btn_a_click" />     <textbox x:name="txt_display" height="50" margin="208,57,252,0" textwrapping="wrap" verticalalignment="top"/>     <button x:name="btn_b" content="b" height="56" margin="297,149,252,0" verticalalignment="top" click="btn_b_click" /> </grid> 

public partial class clear : window {     public clear()     {         this.initializecomponent();               }      private void btn_a_click(object sender, routedeventargs e)     {         txt_display.text += btn_a.content.tostring();         txt_display.selectionstart = txt_display.text.length;         txt_display.focus();     }      private void btn_b_click(object sender, routedeventargs e)     {         txt_display.text += btn_b.content.tostring();         txt_display.selectionstart = txt_display.text.length;         txt_display.focus();     } }

enter image description here

here want bind button content mouse selection starting above figure.

but can't resolve scenario.

please me.

not sure if understand question, trying insert content of button @ cursor location in textbox? if that's case, need caret index of textbox determine insert.

private void btn_a_click(object sender, routedeventargs e) {     var caretindex = txt_display.caretindex;     txt_display.text =txt_display.text.insert(caretindex, btn_a.content.tostring());     txt_display.selectionstart = txt_display.text.length;     txt_display.focus(); }

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