由网友(画一方禁地,囚我于无期-)分享简介：我想在一个富文本框来构建，如文件列表中的树状视图。I'm trying to build a treeview like file list in a richtext box.它应该看起来像一个探险家树视图。我的code是能够得到一个调整大小的图标，但透明度缺失（浅灰色的背景，而不是透明度）。我需要做什么改变这里...

我想在一个富文本框来构建，如文件列表中的树状视图。

I'm trying to build a treeview like file list in a richtext box.

它应该看起来像一个探险家树视图。我的code是能够得到一个调整大小的图标，但透明度缺失（浅灰色的背景，而不是透明度）。我需要做什么改变这里的？是图像格式错误？ 有没有更好的方式来将图像添加到一个RichTextBox？

It should look like an explorer treeview. My code is able to get an resize the icon, but the transparency is missing (light gray background instead of transparency). What do I need to change here? Is the Image format wrong? Is there a better way to add an image to a richtextbox?

// Get file info
FileInfo f = new FileInfo("myfile.name");
// Get icon for fileinfo
Icon ico = Icon.ExtractAssociatedIcon(f);
// Convert icon to bitmap
Bitmap bm = ico.ToBitmap();
// create new image with desired size
Bitmap img = new Bitmap(16,16,PixelFormat.Frmat32bpRgb);
// Create graphics with desired sized image
Graphics g = Graphics.FormImage(img);
// set interpolation mode
g.InterpolationMode = InterpolationMode.HighQualityBiCubic;
// draw/resize image
g.DrawImage(bm, new Rectangle(0,0,16,16), new Rectangle(0, 0, bm.Width, bm,Height), GraphicalUnit.Pixel);
// Paste to clipboard
Clipboard.SetImage(bm);
// Paste in RichtextBox
rtb.Paste();

例如：

编辑：

我已经想通了，该图像是透明的，但使用Clipboard.SetImage（）不会发布为透明图像。

I've figured out that the image is transparent, but using Clipboard.SetImage() doesn't publish it as transparent image.

任何想法，为什么我能做些什么来解决这个问题？我是否需要切换到differn文本框控件？

Any ideas why and what can I do to fix it? Do I need to switch to a differn textbox control?

推荐答案

我有一些运气经历显卡。

I've had some luck going through Graphics.

Bitmap b = new Bitmap(pbAssetLoaded.Width, pbAssetLoaded.Height);
using (Graphics g = Graphics.FromImage(b))
{
    g.DrawIcon(SystemIcons.Information, 0, 0);
}

这与透明位图绘制图标。

This draws the icon with transparency to the Bitmap.