How to make the last column in WPF datagrid take all the left space, always?

Question

Standard WPF 4 Datagrid.

Let\' say I have datagrid 200 pixels wide, and 2 columns. I would like the columns take always entire space, meaning if the user resizes the

Answer 1

Here's a very simple answer, all performed in code behind. :-) All columns will be auto-sized; the final column will fill all remaining space.

// build your datasource, e.g. perhaps you have a:
List people = ...

// create your grid and set the datasource
var dataGrid = new DataGrid();
dataGrid.ItemsSource = people;

// set AutoGenerateColumns to false and manually define your columns
// this is the price for using my solution :-)
dataGrid.AutoGenerateColumns = false;

// example of creating the columns manually.
// there are obviously more clever ways to do this 
var col0 = new DataGridTextColumn();
col0.Binding = new Binding("LastName");
var col1 = new DataGridTextColumn();
col1.Binding = new Binding("FirstName");
var col2 = new DataGridTextColumn();
col2.Binding = new Binding("MiddleName");
dataGrid.Columns.Add(col0);
dataGrid.Columns.Add(col1);
dataGrid.Columns.Add(col2);

// Set the width to * for the last column
col2.Width = new DataGridLength(1, DataGridLengthUnitType.Star);