如何在 datagridview 列标题中显示图像? [英] How to display an image in a datagridview column header?

问题描述

在运行时，我将一个 DataGridView 添加到 Windows 窗体中.最后一列是 DataGridViewImageColumn:

At run-time, I am adding a DataGridView to a windows form. The final column is a DataGridViewImageColumn:

Dim InfoIconColumn As New DataGridViewImageColumn
MyDataGridView.Columns.Insert(MyDataGridView.Columns.Count, InfoIconColumn)

添加以下代码将使我的信息图标(位图)显示在每个列单元格中，但不会显示在列标题中:

Adding the following code will get my Information Icon (bitmap) to display in each of the column cells but NOT the column header:

Dim InfoIcon As New Bitmap("C:MyPathInfoIcon.bmp")
InfoIconColumn.Image = InfoIcon

另外，值得注意的是，图像在单元格中完美"显示，即其大小正确以适合单元格.

Also, it is worth noting that the image displays 'perfectly' in the cells i.e. it is sized correctly to fit the cell.

但是，我找不到将相同图像添加到列标题单元格的方法.经过一番谷歌搜索后，我使用以下代码将图像放在标题单元格中，但给我留下了两个问题:

However, I cannot find a way to add the same image to the column header cell. After some googling I used the following code which placed the image in the header cell but left me with two problems:

1. 图像没有像添加到列单元格时那样自动调整"到列标题单元格.图像稍大且模糊.
2. 使用 _CellPainting 事件会降低性能，即当鼠标悬停在 DataGridView 上以突出显示所选行时，突出显示滞后于放置鼠标的位置.

1. The image did not 'auto-size' to the column headercell in the same way it did when added to the column cells. The image was slightly larger and blurred.
2. By using the _CellPainting event slowed down performance i.e. when hovering over the DataGridView to highlight the selected row the highlighting lagged behind where my mouse was placed.

代码如下:

Private Sub MyDataGridView_CellPainting(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellPaintingEventArgs) Handles MyDataGridView.CellPainting
   Dim InfoIcon As Image = Image.FromFile("C:MyPathInfoIcon.bmp")
   If e.RowIndex = -1 AndAlso e.ColumnIndex = MyDataGridView.Columns.Count - 1 Then
       e.Paint(e.CellBounds, DataGridViewPaintParts.All And Not   DataGridViewPaintParts.ContentForeground)
       e.Graphics.DrawImage(InfoIcon, e.CellBounds)
       e.Handled = True
    End If
End Sub

有谁知道解决我的问题并在运行时将尺寸合适、清晰的图像放入 DataGridViewImageColumn 标题单元格的方法吗?

Does anybody know of a way to solve my problem and get a nicely sized, sharp image into a DataGridViewImageColumn headercell at run-time?

推荐答案

一种方法是使用 CellsPainting 事件来绘制特定标题单元格的位图.这是执行此操作的代码假设位图在 imagelist 中.

One way you can do this is to use the CellsPainting event to draw the bitmap for a particular header cell. Here is code that does this assuming the bitmap is in an imagelist.

//this.images is an ImageList with your bitmaps
void dataGridView1_CellPainting(object sender, DataGridViewCellPaintingEventArgs e)
{
    if (e.ColumnIndex == 1 && e.RowIndex == -1)
    {
        e.PaintBackground(e.ClipBounds, false);

        Point pt = e.CellBounds.Location;  // where you want the bitmap in the cell

        int offset = (e.CellBounds.Width - this.images.ImageSize.Width) / 2;
        pt.X += offset;
        pt.Y += 1;
        this.images.Draw(e.Graphics, pt, 0);
        e.Handled = true;
    }
}

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