How to make DataGrid column stretch from C# code?

Question

I\'m creating the columns of a WPF DataGrid in my C# code. I want one of the columns to stretch to the width of the DataGrid automatically. In XAML

Answer 1

You're actually using something called a DataGridLength there.

Try something like this:

Grid.ColumnDefinitions[0].Width = new DataGridLength(0.2, DataGridLengthUnitType.Star);
Grid.ColumnDefinitions[1].Width = new DataGridLength(0.8, DataGridLengthUnitType.Star);

That will split the remaining space 80% / 20% between these two columns.

Answer 2

try this

DataGrid1.Width = double.NaN;