c# - WPF DataGrid - Binding Source and Width to different objects -


in wpf application, have datagrid bound collection in viewmodel, want width of first column equal property on viewmodel itself, so:

public observablecollection<booking> bookings {     return repository.bookings(); }  public int maxwidth {     return 100; }

(i realise there's no point in binding fixed property - it's demo purposes)

<usercontrol>     <datagrid datacontext="{binding bookings}">         <datagrid.columns>             <datagridtextcolumn width="{binding relativesource={relativesource findancestor, ancestortype={x:type usercontrol}}, path=datacontext.maxwidth}" header="provider" binding="{binding name}" />         </datagrid.columns>     </datagrid> </usercontrol>

but if this, width of column remains @ default value - i.e. wide enough accommodate value.

what doing wrong?

edit: attempted this, see happened:

<label name="tricky" content="500" visibility="collapsed"></label> ... <datagridtextcolumn width="{binding elementname=tricky, path=content}" header="provider" binding="{binding name}" />

which did nothing. not possible set width dynamically?

i think problem datagridtextcolum not part of visual tree (can verify snoop), binding never gets resolved.

the data obtained datagridtextcolumn used build datagridcell template, , @ time template built, datacontext isn't set.

my suggestion use datagridtemplatecolumn, , specify own celltemplate has width binding need.


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