将数据网格视图背景设置为透明 [英] Set datagrid view background to transparent

问题描述

我尝试将数据网格视图的背景颜色设置为从属性透明"，但它说不是有效属性".

I tried to set the background color of a data grid view to be "transparent" from properties but it it said "not a valid property".

我该怎么做?

推荐答案

我对一个特定问题(当网格包含在带有背景图像的表单中时)做了这个解决方案，通过简单的修改你可以调整它以创建一个通用的透明网格，只要询问父级是否有背景图像，否则只需使用父级背景色来绘制你的网格，仅此而已.

I did this solution to a specific problem (when the grid was contained in a form with background image) with simples modifications you can adapt it to create a generic transparent Grid, just ask if the parent have background image, else just use the parent backcolor to paint your grid, and that is all.

您必须从 DataGridView 继承并像这样覆盖 PaintBackground 方法:

You must inherit from DataGridView and override the PaintBackground method like this:

protected override void PaintBackground(Graphics graphics, Rectangle clipBounds,  Rectangle gridBounds)
  {
    base.PaintBackground(graphics, clipBounds, gridBounds);
    Rectangle rectSource = new Rectangle(this.Location.X, this.Location.Y, this.Width, this.Height);
    Rectangle rectDest = new Rectangle(0, 0, rectSource.Width, rectSource.Height);

    Bitmap b = new Bitmap(Parent.ClientRectangle.Width, Parent.ClientRectangle.Height);
    Graphics.FromImage(b).DrawImage(this.Parent.BackgroundImage, Parent.ClientRectangle);


    graphics.DrawImage(b, rectDest, rectSource, GraphicsUnit.Pixel);
    SetCellsTransparent();
  }


public void SetCellsTransparent()
{
    this.EnableHeadersVisualStyles = false;
    this.ColumnHeadersDefaultCellStyle.BackColor = Color.Transparent;
    this.RowHeadersDefaultCellStyle.BackColor = Color.Transparent;


    foreach (DataGridViewColumn col in this.Columns)
    {
        col.DefaultCellStyle.BackColor = Color.Transparent;
        col.DefaultCellStyle.SelectionBackColor = Color.Transparent;
    }
}

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