winform - 合并datagridview标头 [英] winform - merging datagridview headers

问题描述

我使用这段代码：

  void dataGridView1_Paint（object sender，PaintEventArgs e）
 {
 Rectangle r1 = dataGridView1.GetCellDisplayRectangle（2，-1，true）; 
 Rectangle r2 = dataGridView1.GetCellDisplayRectangle（3，-1，true）; 
 
 r1.X + = 1; 
 r1.Y + = 2; 
 r1.Width + = r2.Width  -  2; 
 r1.Height  -  = 6; 
 
 using（SolidBrush br = new SolidBrush（dataGridView1.ColumnHeadersDefaultCellStyle.BackColor））
 {
 e.Graphics.FillRectangle（br，r1）; 
 
 
 //绘制文本
使用（SolidBrush br = new SolidBrush（this.dataGridView1.ColumnHeadersDefaultCellStyle.ForeColor））
 {
 StringFormat sf = new StringFormat 
 {
 LineAlignment = StringAlignment.Center，
 Alignment = StringAlignment.Center 
}; 
 e.Graphics.DrawString（merged header，dataGridView1.ColumnHeadersDefaultCellStyle.Font，br，r1，sf）; 
} 
} 
  

滚动网格之前。一切都很好，但滚动后，标题文字更改为垃圾文字。
请检查快照。

我很感激有人可以帮助我找到一个很好的解决方案。

ali.mz

解决方案

我相信最简单的方法是在每次datagridview滚动时使合并的标题的单元格无效。您需要在Scroll事件中添加一个处理程序：

  dataGridView1.Scroll + = new System.Windows.Forms.ScrollEventHandler this.dataGridView1_Scroll）; 
  

以下是滚动事件处理程序实现：

  private void dataGridView1_Scroll（object sender，ScrollEventArgs e）
 {
 Rectangle rect = Rectangle.Union（
 dataGridView1.GetCellDisplayRectangle（2，-1，true ），
 dataGridView1.GetCellDisplayRectangle（3，-1，true））; 
 dataGridView1.Invalidate（rect）; 
} 
  

希望这有助于，

I have a problem with merge the datagridview headers in winForm.

I using this code :

void dataGridView1_Paint(object sender, PaintEventArgs e)
    {
        Rectangle r1 = dataGridView1.GetCellDisplayRectangle(2, -1, true);
        Rectangle r2 = dataGridView1.GetCellDisplayRectangle(3, -1, true);

        r1.X += 1;
        r1.Y += 2;
        r1.Width += r2.Width - 2;
        r1.Height -= 6;

        using (SolidBrush br = new SolidBrush(dataGridView1.ColumnHeadersDefaultCellStyle.BackColor))
        {
            e.Graphics.FillRectangle(br, r1);
        }

        //draw text
        using (SolidBrush br = new SolidBrush(this.dataGridView1.ColumnHeadersDefaultCellStyle.ForeColor))
        {
            StringFormat sf = new StringFormat
                                  {
                                      LineAlignment = StringAlignment.Center,
                                      Alignment = StringAlignment.Center
                                  };
            e.Graphics.DrawString("merged header", dataGridView1.ColumnHeadersDefaultCellStyle.Font, br, r1, sf);
        }
    }

before scrolling the grid . everything is fine but after scrolling the header text changed to garbage text. please check the snapshot .

I would appreciate it someone could help me to find a good solution.

ali.mz

解决方案

I believe the easiest way would be to invalidate merged header's cells every time the datagridview is scrolled. You would need to add a handler to the Scroll event:

dataGridView1.Scroll += new System.Windows.Forms.ScrollEventHandler(this.dataGridView1_Scroll);

Below is scroll event handler implementation:

private void dataGridView1_Scroll(object sender, ScrollEventArgs e)
{
    Rectangle rect = Rectangle.Union(
        dataGridView1.GetCellDisplayRectangle(2, -1, true), 
        dataGridView1.GetCellDisplayRectangle(3, -1, true));
    dataGridView1.Invalidate(rect);
}

hope this helps, regards

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