How do I automatically size (autosize) Columns in a WinForms DataGrid?
Apparently this is, like, the problem for the ages or something, but noone on this planet has come up with a way to automatically size the columns in a DataGrid. Sure, there's all sorts of pyscho ways that involve measuring the length of strings in DataSets with the Graphics context, yada yada. But, since I'm binding strongly-typed Object Collections to DataGrids in WinForm apps, that doesn't work for me (and it's a little over the top, IMHO).
So, I thought about it like this:
- If you double click on the little splitter between columns they will autosize.
- Therefore, the code to autosize has been written for me; no need to measure strings, etc.
- How do I force a double click? No, wait, wrongheadedness, how do I call whatever THEY call when a double click happens?
- So, I reflectored into DataGrid.OnMouseDown and saw their custom HitTest calls a private ColAutoResize. Ah, bingo.
If you're going to 'sin' do it with style - do it with Reflection.
private void dgLogging_DataSourceChanged(object sender, System.EventArgs e)
{
try
{
Type t = dgLogging.GetType();
MethodInfo m = t.GetMethod("ColAutoResize",BindingFlags.NonPublic);
for (int i = dgLogging.FirstVisibleColumn; (i < dgLogging.VisibleColumnCount); i++)
{
m.Invoke(dgLogging, new object[]{i});
}
}
catch (Exception ex)
{
System.Diagnostics.Trace.Write("Failed Resizing Columns: " + ex.ToString());
}
}
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Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.
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