判斷該滑鼠位置屬於哪個 Row

private int GetRowIndexFromPoint( DataGridView Dgrid, Point pt )
{
//檢查 Left
DataGridViewColumn col = Dgrid.Columns.GetFirstColumn( DataGridViewElementStates.Displayed, DataGridViewElementStates.None );

if ( col == null )
{
return -1;
}

// Left
else if ( pt.X <> {

return -1;

}

//檢查 Right

col = Dgrid.Columns.GetLastColumn( DataGridViewElementStates.Displayed, DataGridViewElementStates.None );

if ( pt.X > Dgrid.GetColumnDisplayRectangle( col.Index, true ).Right )
{
return -1;
}

//檢查 Bottom
int rowIndex = Dgrid.Rows.GetLastRow( DataGridViewElementStates.Displayed );

if ( rowIndex <>

{

return -1;

}

if ( pt.Y > Dgrid.GetRowDisplayRectangle( rowIndex, true ).Bottom )
{
return -1;
}

//檢查 Top
int toFind = -1;
rowIndex = Dgrid.Rows.GetFirstRow( DataGridViewElementStates.Displayed );

if ( rowIndex <>

{

return -1;

}

Rectangle rect = Dgrid.GetRowDisplayRectangle( rowIndex, true );

if ( pt.Y <>

{

return -1;

}

if ( pt.Y <= rect.Bottom )

{

return rowIndex;

}

rowIndex = Dgrid.Rows.GetNextRow( rowIndex, DataGridViewElementStates.Displayed );

while ( rowIndex >= 0 )
{
rect = Dgrid.GetRowDisplayRectangle( rowIndex, true );

if ( rect.Top <= pt.Y && rect.Bottom >= pt.Y )
{
toFind = rowIndex;
rowIndex = -1;
}
else
{
rowIndex = Dgrid.Rows.GetNextRow( rowIndex, DataGridViewElementStates.Displayed );
}
}

return toFind;
}