Question

我试图将DataGridViews行作为Bitmap将其用作游标图标。遗憾的是，DataGridViewRow对象没有DrawToBitmap方法。

我设法得到行的界限（RowRect）并获得整个DataGridView（bmp）的Bitmap。我想我接下来需要从位图中删除一行，但我不知道该怎么做。

这是我的开始代码：

private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
{
    if (dataGridView1.SelectedRows.Count == 1)
    {
        if (e.Button == MouseButtons.Left)
        {
            rw = dataGridView1.SelectedRows[0];
            Rectangle RowRect = dataGridView1.GetRowDisplayRectangle(rw.Index, true);
            Bitmap bmp = new Bitmap(RowRect.Width, RowRect.Height);
            dataGridView1.DrawToBitmap(bmp, new Rectangle(Point.Empty, bmp.Size));
            Cursor cur = new Cursor(bmp.GetHicon());
            Cursor.Current = cur;
            rowIndexFromMouseDown = dataGridView1.SelectedRows[0].Index;
            dataGridView1.DoDragDrop(rw, DragDropEffects.Move);
        }
    }
}

Answer 1

您需要首先获取整个 clientarea内容（您的位图太小！），然后剪切行矩形。还要确保处理创建的资源！

这应该有效：

private void dataGridView1_MouseDown(object sender, MouseEventArgs e)
{

    if (dataGridView1.SelectedRows.Count == 1)
    {
        if (e.Button == MouseButtons.Left)
        {
            Size dgvSz = dataGridView1.ClientSize;
            int rw = dataGridView1.SelectedRows[0].Index;
            Rectangle RowRect = dataGridView1.GetRowDisplayRectangle(rw, true);
            using (Bitmap bmpDgv = new Bitmap(dgvSz.Width, dgvSz.Height))
            using (Bitmap bmpRow = new Bitmap(RowRect.Width, RowRect.Height))
            {
                dataGridView1.DrawToBitmap(bmpDgv , new Rectangle(Point.Empty, dgvSz));
                using ( Graphics G = Graphics.FromImage(bmpRow ))
                    G.DrawImage(bmpDgv , new Rectangle(Point.Empty, 
                                RowRect.Size), RowRect, GraphicsUnit.Pixel);
                Cursor.Current.Dispose();   // not quite sure if this is needed
                Cursor cur = new Cursor(bmpRow .GetHicon());
                Cursor.Current = cur;
                rowIndexFromMouseDown = dataGridView1.SelectedRows[0].Index;
                dataGridView1.DoDragDrop(rw, DragDropEffects.Move);
            }
        }
    }
}

如何将DataGridView行作为光标图标的位图？

1 个答案: