c# - How to set watermark text on watermark textbox -

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i have template this,

<style x:key="watermarktextboxstyle" basedon="{staticresource {x:type textbox}}" targettype="{x:type textbox}">     <setter property="template">         <setter.value>             <controltemplate targettype="{x:type textbox}">                 <grid>                     <scrollviewer x:name="part_contenthost" snapstodevicepixels="{templatebinding snapstodevicepixels}" />                     <textblock x:name="textblock" opacity="0.345" text="enter text here" textwrapping="wrap" visibility="hidden" />                 </grid>                  <controltemplate.triggers>                     <multitrigger>                         <multitrigger.conditions>                             <condition property="isfocused" value="false" />                             <condition property="text" value="" />                         </multitrigger.conditions>                         <setter property="visibility" targetname="textblock" value="visible" />                     </multitrigger>                 </controltemplate.triggers>             </controltemplate>         </setter.value>     </setter> </style>

this seems work quite nicely watermark textbox in wpf, how can change watermark text be?

above hard coded text = 'enter text here'.

if use above this,

<textbox style="{staticresource watermarktextboxstyle}"></textbox>

i cannot set watermark text is.

ideas?

use attached dependency property:

public static class watermark {     public static readonly dependencyproperty textproperty =         dependencyproperty.registerattached( "text",                                              typeof(boolean),                                              typeof(watermark),                                              new frameworkpropertymetadata() );      public static void settext( uielement element, boolean value )     {         element.setvalue( textproperty, value );     }      public static boolean gettext( uielement element )     {         return (boolean)element.getvalue( textproperty );     } }

then control you'd like:

<textbox style="{staticresource watermarktextboxstyle}" watermark.text="search" />

your style need bind dp:

<textblock x:name="textblock" opacity="0.345"            text="{binding relativesource={relativesource templatedparent}, path=(local:watermark.text)}"            textwrapping="wrap" visibility="hidden" />

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