通过编程设置DataGrid使用的DataColumn的宽度

ColumnDefinition col1 = new ColumnDefinition();
col1.Width = GridLength.Auto;
ColumnDefinition col2 = new ColumnDefinition();
col2.Width = new GridLength(1,GridUnitType.Star);

grid.ColumnDefinitions.Add(col1);
grid.ColumnDefinitions.Add(col2);

顶部部件将自动调整列的大小,底部部件可以自定义大小。查看此网站了解更多详细信息-- http://www.wpftutorial.net/GridLayout.html

foreach (var column in dataGrid.Columns)
    column.Width = DataGridLength.Auto;
dataGrid.Columns.Last().Width = DataGridLength.SizeToCells;