Question

I’m having a weird issue in a program I’m developing for .NET 3.5 using C# in Visual Studio 2010.

I’m populating a DataGridView with information and I’d like to resize the data grid columns according to the headers, but also allow the user to manually resize the colums if the data is longer than the length of the header value.

So I changed my DataGridView.AutoSizeColumnsMode = ColumnHeader. The DataGridView is now resizing the columns automatically according to the header, but suddenly I find that I can’t resize the columns manually with my mouse even though my DataGridView.AllowUserToResizeColumns property is true.

My question is how can I automatically size my data grid view columns while still allowing the user to resize the columns?

Answer 1

The solution from here coverted to C# and tested:

for (int i = 0; i < dataGridView1.Columns.Count; i++)
{
   // Size the column header based on the ColumnHeader mode
   dataGridView1.Columns[i].AutoSizeMode = 
      DataGridViewAutoSizeColumnMode.ColumnHeader;
   // Store autosized width
   int colw = dataGridView1.Columns[i].HeaderCell.PreferredSize.Width;
   // Change back to Resize mode
   dataGridView1.Columns[i].AutoSizeMode = 
      DataGridViewAutoSizeColumnMode.None;
   // Set width to calculated above
   dataGridView1.Columns[i].Width = colw;
}

Just found a better solution from MSDN. Before the DataGridView is displayed, use the AutoResizeColumn function. For example:

void Form1_Load(object sender, EventArgs e)
{
   for (int i = 0; i < dataGridView1.Columns.Count; i++)
   {
      dataGridView1.AutoResizeColumn(
         i, DataGridViewAutoSizeColumnMode.ColumnHeader);
   }
}