Methods for displaying row numbers in a dview

Method 1:

The most common practice on the Internet is to use the RowPostPaint event of the DataGridView rowto draw a row number in RowHeaderCell:

 

RowPostPaint

 Private void maid (object sender, maid e)
{
Try
{
// Add a row number
SolidBrush v_SolidBrush = new SolidBrush (dataGridView1.RowHeadersDefaultCellStyle. ForeColor );
Int v_LineNo = 0;
V_LineNo = e. RowIndex + 1;

String v_Line = v_LineNo.ToString ();

E. Graphics. DrawString (v_Line, e. InheritedRowStyle. Font, v_SolidBrush, e. RowBounds. Location. X + 15, e. RowBounds. Location. Y + 5 );

}
Catch (Exception ex)
{
MessageBox. Show ("an error occurred when adding a row number. error Message:" + ex. Message, "operation failed ");
}
}

 

 

 

However, this method has poor performance when there is a large amount of data, and the RowPostPaint event is triggered every time the data is rolled.

 

 

Method 2:

My approach is to assign a value to the HeaderCell of each row.

I found someone mentioned this on the Internet, but I chose the above method because of the display problem. The specific problem is that when the row number exceeds two digits, such as 100 and 1000, the row indicator of the DataGridView▶It will squeeze the row number to the right, leading to incomplete reality. It will be displayed at 100.▶10.

In fact, there is still a problem with the RowsHeaderWidth size. You can enlarge the width of the column and display the row number!

I don't know if they have tried it. The method for drawing the row number above is also problematic when the row number is displayed.

 

Now that you know the problem