I have a DataGrid Control which is bound to a SQL Table.
The XAML Code is:
Solution:
void dg_sql_data_SizeChanged(object sender, SizeChangedEventArgs e)
{
DataGrid myDataGrid = (DataGrid)sender;
// Do not change column size if Visibility State Changed
if (myDataGrid.RenderSize.Width != 0)
{
double all_columns_sizes = 0.0;
foreach (DataGridColumn dg_c in myDataGrid.Columns)
{
all_columns_sizes += dg_c.ActualWidth;
}
// Space available to fill ( -18 Standard vScrollbar)
double space_available = (myDataGrid.RenderSize.Width - 18) - all_columns_sizes;
foreach (DataGridColumn dg_c in myDataGrid.Columns)
{
dg_c.Width = new DataGridLength(dg_c.ActualWidth + (space_available / myDataGrid.Columns.Count));
}
}
}
Building on Henrik P's answer, this solution simply straightens out the bug with Width='*'
so that you can set any column to be proportional like you can on a grid:
private void DgSQLDataSizeChanged(object sender, SizeChangedEventArgs e)
{
var myDataGrid = (DataGrid)sender;
// Do not change column size if Visibility State Changed
if (myDataGrid.RenderSize.Width == 0) return;
double totalActualWidthOfNonStarColumns = myDataGrid.Columns.Sum(
c => c.Width.IsStar ? 0 : c.ActualWidth);
double totalDesiredWidthOfStarColumns =
myDataGrid.Columns.Sum(c => c.Width.IsStar ? c.Width.Value : 0);
if ( totalDesiredWidthOfStarColumns == 0 )
return; // No star columns
// Space available to fill ( -18 Standard vScrollbar)
double spaceAvailable = (myDataGrid.RenderSize.Width - 18) - totalActualWidthOfNonStarColumns;
double inIncrementsOf = spaceAvailable/totalDesiredWidthOfStarColumns;
foreach (var column in myDataGrid.Columns)
{
if ( !column.Width.IsStar ) continue;
var width = inIncrementsOf * column.Width.Value;
column.Width = new DataGridLength(width, DataGridLengthUnitType.Star);
}
}
I liked Henrik's answer but needed two columns to fill the extra space, like a grid.
I set up in WPF 3.5 SP1 and it works perfect, no guaranties about Silverlight, but if it works it's indeed charming.
<data:DataGridTextColumn Header="Time" Binding="{Binding}" Width="*" />
You can set it programmatically:
var col = new DataGridTextColumn();
col.Width = new DataGridLength(100, DataGridLengthUnitType.Star);
Grid1.Columns.Add(col);
In silverlight 4: simply set ColumnWidth="*" on the DataGrid
<data:DataGrid ColumnWidth="*" />
I have created an attached property for the DataGrid that lets you do this in XAML:
<UserControl
xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"
x:Class="GridProperties.Page"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:gp="clr-namespace:GridProperties">
<Grid x:Name="LayoutRoot" Background="White">
<data:DataGrid gp:GridEx.StarColumn="2">
<data:DataGrid.Columns>
<data:DataGridTextColumn Header="Column 1"/>
<data:DataGridTextColumn Header="Column 2"/>
<data:DataGridTextColumn Header="Column 3"/>
</data:DataGrid.Columns>
</data:DataGrid>
</Grid>
</UserControl>