Code:
public void AutoSizeGrid(DataGrid dGrid)
{
// DataGrid should be bound to a DataTable for this part to
// work.
int numRows = ((DataTable)dGrid.DataSource).Rows.Count;
Graphics g = Graphics.FromHwnd(dGrid.Handle);
StringFormat sf = new StringFormat(StringFormat.GenericTypographic);
SizeF size;
// Since DataGridRows[] is not exposed directly by the DataGrid
// we use reflection to hack internally to it.. There is actually
// a method get_DataGridRows that returns the collection of rows
// that is what we are doing here, and casting it to a System.Array
MethodInfo mi = dGrid.GetType().GetMethod("get_DataGridRows",
BindingFlags.FlattenHierarchy | BindingFlags.IgnoreCase | BindingFlags.Instance
| BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Static);
System.Array dgra = (System.Array)mi.Invoke(dGrid,null);
// Convert this to an ArrayList, little bit easier to deal with
// that way, plus we can strip out the newrow row.
ArrayList DataGridRows = new ArrayList();
foreach (object dgrr in dgra)
{
if (dgrr.ToString().EndsWith("DataGridRelationshipRow")==true)
DataGridRows.Add(dgrr);
}
// Now loop through all the rows in the grid
for (int i = 0; i < numRows; ++i)
{
// Here we are telling it that the column width is set to
// 400.. so size will contain the Height it needs to be.
size = g.MeasureString(dGrid[i,1].ToString(),dGrid.Font,400,sf);
int h = Convert.ToInt32(size.Height);
// Little extra cellpadding space
h = h + 8;
// Now we pick that row out of the DataGridRows[] Array
// that we have and set it's Height property to what we
// think it should be.
PropertyInfo pi = DataGridRows[i].GetType().GetProperty("Height");
pi.SetValue(DataGridRows[i],h,null);
// I have read here that after you set the Height in this manner that you should
// Call the DataGrid Invalidate() method, but I haven't seen any prob with not calling it..
}
g.Dispose();
}I am using the above code in my C# windows application. But am not getting it to work. One error message says "Specified cast is not valid." in line "int numRows = ((DataTable)dGrid.DataSource).Rows.Count; "
Is there anything that I am doing incorrectly? (Well, i thought copy/paste programming works!)
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The faulty interface lies between the chair and the keyboard.
