在Winforms DataGridView中显示CellPainting事件后的标题文本 [英] Display header text after CellPainting event in winforms datagridview

问题描述

我有一个datagridview控件，我想在每个标题单元格的底部放置一条3px的行，看起来像

I have a datagridview control where I want to put a 3px line at the bottom of each header cell to look something like

我已经在CellPainting中放置了代码，甚至对于datagridview也是如此：

I have put code in CellPainting even for the datagridview like:

           if (e.RowIndex < 0)   // headers
            {

                Rectangle newRect = new Rectangle(e.CellBounds.X, e.CellBounds.Y - 1 + e.CellBounds.Height, e.CellBounds.Width, 2);
                using (Brush gridBrush = new SolidBrush(Color.Red))
                {
                    e.Graphics.FillRectangle(gridBrush, newRect);
                }e.Handled = true;
            }

红线显示正确（稍后我将添加3px）。但是，现在缺少标题文本。

The red line appears correctly (I will add the 3px later). However, the header text now is missing.

我假设设置e.Handled = true;告诉不要继续绘制原始标题文本。如果将其设置为false，则红线消失。 （显然）此控件没有base.CellPainting类型的概念。

I am assuming that setting the e.Handled = true; tells to not continue to draw the original header text. If I set it to false, then the red line disappears. There is no base.CellPainting type concept for this control (apparently).

我知道我自己可以绘制文本，但随后我不得不担心对齐方式，字体。 ..

I know I can draw the text myself, but then I have to worry about alignment, font...

现在是否有办法告诉系统同时进行线条绘制原始标题文本？

Is there now way to tell the system to do both the line AND draw original header text?

如果必要，我愿意尝试其他方法。

I am willing to try other approaches if necessary.

推荐答案

此控件没有base.CellPainting类型概念。

确实； DGV不仅有调用基本事件的更多选择。

Indeed; the DGV has more options than just calling the base event.

相反，您可以让它分别绘制零件并按照需要的顺序进行操作：

Instead you can let it draw the parts separately and in the order you want:

if (e.RowIndex < 0)   // headers
{
    e.PaintBackground(e.CellBounds, true);   // draw the default background

    Rectangle newRect = 
              new Rectangle(e.CellBounds.X, e.CellBounds.Bottom - 2, e.CellBounds.Width, 2);
    e.Graphics.FillRectangle(Brushes.Red, newRect);  // now draw the red line

    e.PaintContent(e.CellBounds);        // finally draw the text in the default way

    e.Handled = true;                   // done
}

如果您禁用 dgv.EnableHeadersVisualStyles ，您还可以设置绘制列标题时要使用的许多其他属性。

If you disable dgv.EnableHeadersVisualStyles you can also set many other properties to be used when drawing the column headers..

对于更精细的调整您可能想研究的 MSDN 。

For even finer-tuned options you may want to look into MSDN.

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