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，我在Windows窗体中添加了一个 DataGridView 。最后一列是一个 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)

添加以下代码将获得我的信息图标（位图）显示在每个列单元格中，但不显示列标题：

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:\MyPath\InfoIcon.bmp")
InfoIconColumn.Image = InfoIcon

另外，值得注意的是，图像在单元格中显示完美，即它的大小正确适合单元格。

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，我找不到将相同的图像添加到列标题单元格的方式。经过一些搜索之后，我使用以下代码，将图像放在标题单元格中，但是给我带来了两个问题：

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. 图像没有自动调整大小'到列标题单元格，就像添加到列单元格一样。图像略大，模糊。


2. 通过使用 _CellPainting 事件减慢性能，即将鼠标悬停在 DataGridView 来突出显示我的鼠标放置位置的突出显示位置。

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：

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:\MyPath\InfoIcon.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

有谁知道一种方法来解决我的问题，并得到一个很好的大小，清晰的图像，在运行时是 DataGridViewImageColumn headercell？

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

您可以使用 CellsPainting 事件来绘制特定标题单元格的
位图。这是代码，这个
，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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