c# - Freeze certain controls while Scaling (Render as Bitmap) -

i trying take snapshot of wpf control in various size regardless of original control size. if control size 300 px width , height, trying take snapshot in various size 1500px height , width, 100px height , width , on.

here snapshot snippet

        objframework.layouttransform =             new scaletransform(actualwidth / requiredwidth, actualheight / requiredheight);              renderbitmap = new rendertargetbitmap(requiredwidth, requiredheight, 96d, 96d, pixelformats.pbgra32);              var dv = new drawingvisual();             using (drawingcontext ctx = dv.renderopen())             {                 var vb = new visualbrush(objframework);                 ctx.drawrectangle(vb, null, new rect(0, 0, requiredwidth, requiredheight));             }              renderbitmap.render(dv); 

what looking :

i don't want few of child controls scaled. textblock inside or 1 of grid row height constant when scaling happen. sample control structure

<grid>     <border x:name="brdtiles"  verticalalignment="center" horizontalalignment="center" borderthickness="1" borderbrush="black" >         <local:gridextension x:name="grdtileholder" background="#ffffff" >             <grid.columndefinitions>                 <columndefinition width="*" />                 <columndefinition width="*" />             </grid.columndefinitions>              <grid.rowdefinitions>                 <rowdefinition height="25" />                 <rowdefinition height="*" />             </grid.rowdefinitions>               <grid grid.row="0" grid.column="1" x:name="tilecolumnheader" >                                         <grid.columndefinitions>                     <columndefinition width="100" />                     <columndefinition width="100" />                     <columndefinition width="100" />                     <columndefinition width="100" />                 </grid.columndefinitions>                 <grid.rowdefinitions>                     <rowdefinition height="25"></rowdefinition>                 </grid.rowdefinitions>                 <combobox x:name="grd1" grid.column="0" fontsize="10" height="20" >                     <comboboxitem content="item 1" />                     <comboboxitem content="item 2" />                     <comboboxitem content="item 3" />                 </combobox>                 <textblock x:name="txt1" grid.column="1" text="20" fontsize="10" height="20"/>                 <textblock x:name="txt2" grid.column="2" text="30" fontsize="10" height="20"/>                 <textblock x:name="txt3" grid.column="3" text="40" fontsize="10" height="20"/>             </grid>              <grid grid.column="0" grid.row="1"  x:name="tilerowheader" >                 <grid.rowdefinitions>                     <rowdefinition height="100" />                     <rowdefinition height="30" />                     <rowdefinition height="30" />                     <rowdefinition height="30" />                 </grid.rowdefinitions>                  <combobox horizontalalignment="center" verticalalignment="center" minwidth="100" grid.row="0" >                     <combobox.layouttransform>                         <rotatetransform angle="90" />                     </combobox.layouttransform>                     <combobox.itemspanel>                         <itemspaneltemplate>                             <stackpanel orientation="vertical" isitemshost="true">                                 <stackpanel.layouttransform>                                     <rotatetransform angle="270" />                                 </stackpanel.layouttransform>                             </stackpanel>                         </itemspaneltemplate>                     </combobox.itemspanel>                     <combobox.itemcontainerstyle>                         <style targettype="comboboxitem">                             <setter property="layouttransform">                                 <setter.value>                                     <rotatetransform angle="0" />                                 </setter.value>                             </setter>                         </style>                     </combobox.itemcontainerstyle>                     <comboboxitem>hello</comboboxitem>                     <comboboxitem>world</comboboxitem>                     <comboboxitem>foo</comboboxitem>                     <comboboxitem>check</comboboxitem>                     </combobox>               <textblock text="2" grid.row="1" />                 <textblock text="3" grid.row="2" />                 <textblock text="4" grid.row="3" />             </grid>             <grid grid.row="1" grid.column="1" margin="2" name="tileviewgrid" background="#ffffff" showgridlines="false"  horizontalalignment="center" verticalalignment="center" />         </local:gridextension>     </border> </grid> 

why want this

when take snapshot in various size, text inside looks blurry. need quality text when re-render control.

if consider changing logic loop through (traverse) whole display stack, , set rendertransform on items instead of container, maybe work;

class nonscalabletextblock : system.windows.controls.textblock {     public transform rendertransform     {                  {              return base.rendertransform;          }          set          {              // nothing         }     } } 

(so, jsut use class in place of standard textblocks when dont want scale)

it hides layouttransform property of parent, overriding nothing. reason, rendertransform worked better me layouttransform, not sure why.