HitTestInfo Overview

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");

}

}

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