在列表視圖中爲圖像繪製邊框

Question

在選擇事件後的樹形視圖中，我使用圖像填充列表視圖。
我想定製這些圖像的格式，並在每個圖像周圍放置一個黑色邊框。

private void TreeView1_Select(object sender, EventArgs e) { 
     if (folder != null && System.IO.Directory.Exists(folder)) { 

      DirectoryInfo dir = new DirectoryInfo(@folder); 
      foreach (FileInfo file in dir.GetFiles()) { 
       try { 
        imageList.Images.Add(Image.FromFile(file.FullName)); 
       } catch { 
        Console.WriteLine("This is not an image file"); 
       } 
      } 

      for (int j = 0; j < imageList.Images.Count; j++) { 
       this.ListView1.Items.Add("Item" + j); 
       this.ListView1.Items[j].ImageIndex = j; 
      } 

      this.ListView1.View = View.LargeIcon; 
      this.ListView1.LargeImageList = imageList; 
      this.ListView1.DrawItem += 
       new DrawListViewItemEventHandler(ListView1_DrawItem); 

     } 
    } 

    private void ListView1_DrawItem(object sender, DrawListViewItemEventArgs e) 
    { 

    } 

Answer 1

我就從文件加載圖像後立即使用Graphics對象添加邊框：

編輯：修改了代碼，這對我的作品......

private void TreeView1_Select(object sender, EventArgs e) { 
     if (folder != null && System.IO.Directory.Exists(folder)) { 

      DirectoryInfo dir = new DirectoryInfo(@folder); 
      foreach (FileInfo file in dir.GetFiles()) { 

       Image img = new Bitmap(Image.FromFile(file.FullName)); 
       using (Graphics g = Graphics.FromImage(img)){ 
        g.DrawRectangle(Pens.Black, 0, 0, img.Width - 2, img.Height - 2); 
       } 
       imageList.Images.Add(img); 

注意：圖像複製的目的;如果我修改代碼以

Image img = (Bitmap)Bitmap.FromFile("test.bmp"); 

如意見建議，我得到一個異常說「圖形對象不能從具有索引像素格式的圖像創建的。」