C# DataGridView 重绘单元格按钮样式

1、重绘样式

我是把绘制方法写到了util类中，在页面方法中调用。 这样就会在单元格内出现两个按钮。
前提是：DataGridView 中的这一列的头的名字是：操作（下面用到，否则不匹配）

CellPainting的事件中调用Painting()方法：

 private void DataGridView_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
 {
     util.Painting(e, myDataGridView);
 }

样式如下：

2、调用按钮的事件，执行方法

在点击事件中，根据返回值，判断是调用了哪个方法，查看、修改、删除。

CellMouseClick的事件中调用Operation()方法：

private void DataGridView_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
{
	int clickFlag = util.Operation(e, myDataGridView);
	if (1 == clickFlag)
	{
	    //删除操作
	}
	else if (2 == clickFlag)
	{
	    //编辑操作
	}
	else if (3 == clickFlag)
	{
	    //查看操作
	}
}

下面是util类：

 public static void Painting(DataGridViewCellPaintingEventArgs e, DataGridView dgView)
 {
     if (e.ColumnIndex >= 0 && e.RowIndex >= 0)
     {
         if (dgView.Columns[e.ColumnIndex].HeaderText == "操作")
         {
             StringFormat sf = StringFormat.GenericDefault.Clone() as StringFormat;//设置重绘入单元格的字体样式
             sf.FormatFlags = StringFormatFlags.DisplayFormatControl;
             sf.Alignment = StringAlignment.Center;
             sf.LineAlignment = StringAlignment.Center;
             sf.Trimming = StringTrimming.EllipsisCharacter;

             e.PaintBackground(e.CellBounds, false);//重绘边框

             //设置要写入字体的大小
             System.Drawing.Font myFont = new System.Drawing.Font("宋体", 15F, System.Drawing.FontStyle.Underline, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
             SizeF sizeDel = e.Graphics.MeasureString("删除", myFont);
             SizeF sizeMod = e.Graphics.MeasureString("编辑", myFont);
             SizeF sizeLook = e.Graphics.MeasureString("查看", myFont);

             float fDel = sizeDel.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width); //
             float fMod = sizeMod.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);
             float fLook = sizeLook.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);

             //设置每个“按钮的边界”
             RectangleF rectDel = new RectangleF(e.CellBounds.Left, e.CellBounds.Top, e.CellBounds.Width * fDel, e.CellBounds.Height);
             RectangleF rectMod = new RectangleF(rectDel.Right, e.CellBounds.Top, e.CellBounds.Width * fMod, e.CellBounds.Height);
             RectangleF rectLook = new RectangleF(rectMod.Right, e.CellBounds.Top, e.CellBounds.Width * fLook, e.CellBounds.Height);
             e.Graphics.DrawString("删除", myFont, Brushes.Blue, rectDel, sf); //绘制“按钮”
             e.Graphics.DrawString("编辑", myFont, Brushes.Blue, rectMod, sf);
             e.Graphics.DrawString("查看", myFont, Brushes.Blue, rectLook, sf);
             e.Handled = true;
           
             e.Handled = true;
         }
     }
 }

public static int Operation(DataGridViewCellMouseEventArgs e, DataGridView dgView)
{
     if (e.ColumnIndex >= 0 && e.RowIndex >= 0)
     {
         Point curPosition = e.Location;//当前鼠标在当前单元格中的坐标
         if (dgView.Columns[e.ColumnIndex].HeaderText == "操作")
         {
             Graphics g = dgView.CreateGraphics();
             System.Drawing.Font myFont = new System.Drawing.Font("宋体", 15F, System.Drawing.FontStyle.Underline, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
             SizeF sizeDel = g.MeasureString("删除", myFont);
             SizeF sizeMod = g.MeasureString("编辑", myFont);
             SizeF sizeLook = g.MeasureString("查看", myFont);
             float fDel = sizeDel.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);
             float fMod = sizeMod.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);
             float fLook = sizeLook.Width / (sizeDel.Width + sizeMod.Width + sizeLook.Width);

             Rectangle rectTotal = new Rectangle(0, 0, dgView.Columns[e.ColumnIndex].Width, dgView.Rows[e.RowIndex].Height);
             RectangleF rectDel = new RectangleF(rectTotal.Left, rectTotal.Top, rectTotal.Width * fDel, rectTotal.Height);
             RectangleF rectMod = new RectangleF(rectDel.Right, rectTotal.Top, rectTotal.Width * fMod, rectTotal.Height);
             RectangleF rectLook = new RectangleF(rectMod.Right, rectTotal.Top, rectTotal.Width * fLook, rectTotal.Height);


             if (rectDel.Contains(curPosition))//删除
             {
                 return 1;
             }
             else if (rectMod.Contains(curPosition))//编辑
             {
                 return 2;
             }
             else if (rectLook.Contains(curPosition)) // 查看
             {
                 return 3;
             }
         }
     }
     return 0;
 }

这样重新绘制按钮可以实现该有的效果，但是和面一直启动或者刷新时，一直在调用CellPainting事件，可能会使页面卡顿。