WPF Datagrids slow when using Auto column sizes -


when expand expander in code below, application becomes sluggish , takes 2-3 seconds respond resize/move events triggered user. if set second column <columndefinition width="250"/> response time remains optimal. missing here? (i'm need ui per below without sluggishness)

<usercontrol>   <grid>     <grid.rowdefinitions>       <rowdefinition height="auto" />       <rowdefinition />     </grid.rowdefinitions>     <grid.columndefinitions>       <columndefinition />       <columndefinition width="auto" />     </grid.columndefinitions>     <toolbar .. />     <datagrid grid.row="1" itemssource="{binding collection1}" .. />     <expander grid.column="1" grid.rowspan="2">       <datagrid itemssource="{binding collection2}" .. />     </expander>   </grid> </usercontrol>

fyi: suspect row virtualization not being used when width=auto set , datagridrow objects being created entire bound data source...

update following not remove sluggishness;

<grid.columndefinitions>   <columndefinition />   <columndefinition width={binding elementname=expander, path=width} /> </grid.columndefinitions> .. <expander name="expander" grid.column="1" grid.rowspan="2">   <datagrid itemssource="{binding collection2}" width="300" .. /> </expander>

the problem if set columnwidth auto, column width calculated depending on content, here, datagrid. have second column large (even though might not see depending on layout) , datagrid's columns drawn every time.

so basically, loose benefits of columnvirtualization (not rowvirtualization).

this same reason why should never put datagrid scrollviewer.

solution
set virtualizingstackpanel.isvirtualizing="true" on grid

if not work, might have take care of resizing yourself, no real option there.


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