2015.1.4 判断鼠标点击DataGridView的第几行还是空白处

public int GetRowIndexAt(int mouseLocation_Y)

{

if (dvaw.FirstDisplayedScrollingRowIndex < 0)

{

return -1;

}

if (dvaw.ColumnHeadersVisible == true && mouseLocation_Y <= dvaw.ColumnHeadersHeight)

{

return -1;

}

int index = dvaw.FirstDisplayedScrollingRowIndex;

int displayedCount = dvaw.DisplayedRowCount(true);

for (int k = 1; k <= displayedCount; )

{

if (dvaw.Rows[index].Visible == true)

{

Rectangle rect = dvaw.GetRowDisplayRectangle(index, true);  // 取该区域的显示部分区域

if (rect.Top <= mouseLocation_Y && mouseLocation_Y < rect.Bottom)

{

return index;

}

k++;

}

index++;

}

return -1;

}