Sometimes in applications you may need to recognize which element is located at the specified screen coordinates. For instance, you may have to determine which part of a DataGridView the user has clicked or double-clicked. For this purpose, DataGridView implements the HitTest method.
For demonstrative purposes on how to process data provided by a HitTestInfo object, you can make use of the following example. It handles the DataGridView.MouseMove event and shows information about a part under the mouse cursor.
private void dataGridView1_MouseMove(object sender, MouseEventArgs e)
{
System.Windows.Forms.DataGridView.HitTestInfo hitInfo = dataGridView1.HitTest(e.X, e.Y);
this.listBox1.Items.Clear();
// displaying dataGridView related information defined a point under the mouse cursor
listBox1.Items.Add("Point: " + new Point(e.X, e.Y) );
listBox1.Items.Add("Type: " + hitInfo.Type.ToString());
listBox1.Items.Add("ColumnIndex: " + hitInfo.ColumnIndex);
listBox1.Items.Add("RowIndex: " + hitInfo.RowIndex);
if (hitInfo.ColumnIndex != -1)
{
DataGridViewColumn column = dataGridView1.Columns[hitInfo.ColumnIndex];
listBox1.Items.Add("Column Caption: " + column.DataPropertyName );
}
else
{
listBox1.Items.Add("No Column");
}
}
