在列标题上绘制矩形 [英] paint rectangle on column header

问题描述

我在datagridview的列标题上绘制矩形，但在滚动到右侧时它会消失，如图中所示（scroll.png）

这里是我的代码

  Rectangle r1; 
 void dataGridView1_Paint（object sender，PaintEventArgs e）
 {
 string [] monthes = {APPLE，MANGO，CHERRY，GRAPES，PINEAPPLE}; 
 for（int j = 0; j  {
 r1 = this.dataGridView1.GetCellDisplayRectangle（j，-1，true）; 
 int w2 = this.dataGridView1.GetCellDisplayRectangle（j + 1，-1，true）.Width; 
 r1.X + = -2; 
 r1.Y + = 30; 
 r1.Width = r1.Width + w2  -  1; 
 r1.Height = r1.Height / 3  -  2; 
 e.Graphics.FillRectangle（new SolidBrush（this.dataGridView1.ColumnHeadersDefaultCellStyle.BackColor），r1）; 
 StringFormat format = new StringFormat（）; 
 format.Alignment = StringAlignment.Center; 
 format.LineAlignment = StringAlignment.Center; 
 e.Graphics.DrawRectangle（new Pen（Color.Black），r1）; 
 e.Graphics.DrawString（monthes [j / 2]，this.dataGridView1.ColumnHeadersDefaultCellStyle.Font，new SolidBrush（this.dataGridView1.ColumnHeadersDefaultCellStyle.ForeColor），r1，format）; 
 
 j + = 2; 
 
 
 
 void dataGridView1_Scroll（object sender，ScrollEventArgs e）
 {
 Rectangle rtHeader = this.dataGridView1.DisplayRectangle; 
 rtHeader.Y + = 0; 
 rtHeader.Height = this.dataGridView1.ColumnHeadersHeight; 
 this.dataGridView1.Invalidate（rtHeader）; 
} 
  

解决方案

负责你所描述行为的行是 this.dataGridView1.Invalidate（rtHeader）;

两种解决方案：

• 删除上述行。
  
• 或者将rectanges放入单元格中第一行就可以），而不是在标题中。

I'm painting rectangle on the column headers in datagridview but on scrolling to right it disappears as in the picture (scroll.png)

here is my code

Rectangle r1;
void dataGridView1_Paint(object sender, PaintEventArgs e)
{
    string[] monthes = { "APPLE", "MANGO", "CHERRY", "GRAPES", "PINEAPPLE" };
    for (int j = 0; j < this.dataGridView1.ColumnCount; )
    {
        r1 = this.dataGridView1.GetCellDisplayRectangle(j, -1, true);
        int w2 = this.dataGridView1.GetCellDisplayRectangle(j + 1, -1, true).Width;
        r1.X += -2;
        r1.Y += 30;
        r1.Width = r1.Width + w2 - 1;
        r1.Height = r1.Height / 3 - 2;
        e.Graphics.FillRectangle(new SolidBrush(this.dataGridView1.ColumnHeadersDefaultCellStyle.BackColor), r1);
        StringFormat format = new StringFormat();
        format.Alignment = StringAlignment.Center;
        format.LineAlignment = StringAlignment.Center;
        e.Graphics.DrawRectangle(new Pen(Color.Black), r1);
        e.Graphics.DrawString(monthes[j / 2], this.dataGridView1.ColumnHeadersDefaultCellStyle.Font, new SolidBrush(this.dataGridView1.ColumnHeadersDefaultCellStyle.ForeColor), r1, format);

        j += 2;
    }
}

void dataGridView1_Scroll(object sender, ScrollEventArgs e)
{
    Rectangle rtHeader = this.dataGridView1.DisplayRectangle;
    rtHeader.Y += 0;
    rtHeader.Height = this.dataGridView1.ColumnHeadersHeight;
    this.dataGridView1.Invalidate(rtHeader);
}

解决方案

I have tested your code and the line responsible for the behaviour you are describing is this.dataGridView1.Invalidate(rtHeader);

Thus you have two solutions:

• Deleting the aforementioned line.
• Or putting the rectanges in the cells (in the first row, would be fine), rather than in the headers.

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