How do I make XAML DataGridColumns fill the entire DataGrid?

Question

I am using DataGrids in XAML (not Silverlight) with resizable columns, the DataGrid will expand if the user resizes the screen.

Currently if the widths of all the DataGrid columns are less than the width of the DataGrid I get an extra "column" appearing which is unclickable and serves no purpose.

Does anyone know how to make one column always resize to fill all the remaining space?

Answer 1

If you use Width="*" the column will fill to expand the available space.

If you want all columns to divide the grid equally apply this to all columns. If you just want one to fill the remaining space just apply it to that column with the rest being "Auto" or a specific width.

You can also use Width="0.25*" (for example) if you want the column to take up 1/4 of the available width.

Answer 2

Make sure your DataGrid has Width set to something like {Binding Path=ActualWidth, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Window,AncestorLevel=1}}.

Like that, your setting of Width="*" attribute on DataGrid.Columns/DataGridXXXXColumn elements should work.

Answer 3

As noted, the ColumnWidth="*" worked perfectly well for a DataGrid in XAML.

I used it in this context:

<DataGrid ColumnWidth="*" ItemsSource="{Binding AllFolders, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />

Answer 4

Set the columns Width property to be a proportional width such as *

Answer 5

My 2 Cent ->

Very late to party

DataGrid -> Column -> Width="*" only work if DataGrid parent container has fix width.

example : i put the DataGrid in Grid -> Column whose width="Auto" then Width="*" in DataGrid does not work but if you set Grid -> Column Width="450" mean fixed then it work fine

Answer 6

Another spin on the same theme:

protected void OnWindowSizeChanged(object sender, SizeChangedEventArgs e)
{
    dataGrid.Width = e.NewSize.Width - (e.NewSize.Width * .1);

    foreach (var column in dataGrid.Columns)
    {
       column.Width = dataGrid.Width / dataGrid.Columns.Count;
    }
 }

Answer 7

I added a HorizontalAlignment="Center" (The default is "Strech") and it solved my problem because it made the datagrid only as wide as needed. (Removed the datagrid's Width setting if you have one.)

Answer 8

This will not expand the last column of the xaml grid to take the remaining space if AutoGeneratedColumns="True".