在datagridview的工具提示中显示图像

Question

背景:我正在使用c#中的winforms.我不希望图像显示在datagridview单元格中,我只在数据库中存储了路径,并在数据库的datagridview中显示它们.

问题:当用户进入单元格时,工具提示会加速.我需要的是当当前单元格的列索引是2时,工具提示应该显示当前单元格中给出的路径的图像.

我发现这篇文章非常好.但无法成功.我有以下代码

    void CustomizedToolTip_Popup(object sender, PopupEventArgs e)
    {
        DataGridView parent = e.AssociatedControl as DataGridView;
        if (parent.CurrentCell != null)
        {
            if (parent.CurrentCell.ColumnIndex == 2)
            {
                Bitmap bmpIn = new Bitmap(parent.CurrentCell.Value + "");
                using (Graphics g = Graphics.FromImage(bmpIn))
                {
                    Rectangle mr = new Rectangle(5, 5, 50, 50);
                    mr.Location = new Point(5, 5);
                    g.PageUnit = GraphicsUnit.Pixel;
                    g.DrawImage(bmpIn, mr);
                }
            }
        }
    }

我认为这段代码应该绘制图像,但它不是绘图,而不是绘图我不确定位置,即使我可以绘制,如何在tootip中找到它.我从上面提到的文章中无法理解.下面是我的datagridview的图像.

Answer 1

我为一个项目做了类似的事情。

相反，我只是使用了一个我设置为打开CellMouseOver、关闭的表单CellMouseLeave

    frm_MouseOverPicture HoverZoom = new frm_MouseOverPicture();

    private void dgv_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
    {
       DataGridView dgv_sender = sender as DataGridView;
       DataGridViewCell dgv_MouseOverCell = dgv_sender.Rows[e.RowIndex].Cells[e.ColumnIndex];

       //Get FilePath from dgv_MouseOverCell content

       //Get x, y based on position relative to edge of screen
       //x, y = top left point of HoverZoom form

       HoverZoom.LoadPicture(FilePath);
       HoverZoom.Location = new System.Drawing.Point(x, y);
       HoverZoom.Show();

    }

    private void dgv_CellMouseLeave(object sender, DataGridViewCellEventArgs e)
    {
       HoverZoom.Hide();
       HoverZoom.ClearPicture();
    }

希望这足够接近您正在寻找的内容。我只是制作了没有边框的表格，并在整个表格上放了一个图片框。

Answer 2

只需将图片框添加到您的表单并将大小模式设置为“StretchImage”和visible= false，然后将以下事件添加到您的datagridview

       private void metroGrid1_CellMouseEnter(object sender, DataGridViewCellEventArgs e)
    {
        DataGridView dgv_sender = sender as DataGridView;
        DataGridViewCell dgv_MouseOverCell=null;
        if (e.RowIndex > 0 && e.ColumnIndex > 0 && e.RowIndex <dgv_sender.RowCount && e.ColumnIndex<dgv_sender.ColumnCount)
        {
          dgv_MouseOverCell = dgv_sender.Rows[e.RowIndex].Cells[e.ColumnIndex];
        }
        if(dgv_MouseOverCell !=null)
        if (e.ColumnIndex == 4) {
            if (dgv_MouseOverCell.Value != null)
            {
                if (File.Exists(dgv_MouseOverCell.Value.ToString()))
                {
                    Image img = Image.FromFile(dgv_MouseOverCell.Value.ToString());
                    pictureBox1.ImageLocation = dgv_MouseOverCell.Value.ToString();
                    pictureBox1.Location = new System.Drawing.Point(Cursor.Position.X - this.Location.X, Cursor.Position.Y - this.Location.Y);
                    pictureBox1.Visible = true;
                }
            }
        }
    }

    private void metroGrid1_CellMouseLeave(object sender, DataGridViewCellEventArgs e)
    {
        pictureBox1.Visible = false;
    }

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