C# 将RenderTargetBitmap转换为System.Drawing.Image

我有3D WPF视觉，我想传递到Excel单元格（通过剪贴板缓冲区）

对于“普通”BMP图像，它可以工作，但我不知道如何转换

RenderTargetBitmap

var bitmap = new Bitmap(renderTarget.PixelWidth, renderTarget.PixelHeight,
    PixelFormat.Format32bppPArgb);

var bitmapData = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size),
    ImageLockMode.WriteOnly, bitmap.PixelFormat);

renderTarget.CopyPixels(Int32Rect.Empty, bitmapData.Scan0,
    bitmapData.Stride*bitmapData.Height, bitmapData.Stride);

bitmap.UnlockBits(bitmapData);

我的代码如下所示：

System.Windows.Media.Imaging.RenderTargetBitmap renderTarget = myParent.GetViewPortAsImage(DiagramSizeX, DiagramSizeY);
System.Windows.Controls.Image myImage = new System.Windows.Controls.Image();
myImage.Source = renderTarget;

System.Drawing.Bitmap pg = new System.Drawing.Bitmap(DiagramSizeX, DiagramSizeY);
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(pg);
gr.DrawImage(myImage, 0, 0);

System.Windows.Forms.Clipboard.SetDataObject(pg, true);
sheet.Paste(range);

我的问题是

gr.DrawImage

不接受

System.Windows.Controls.Image

或

System.Windows.Media.Imaging.RenderTargetBitmap

；只有一个

系统.Drawing.Image

---

如何将

控件.Image.Imaging.RenderTargetBitmap

转换为

图像

，或者有更简单的方法吗？

这就是我提出的解决方案

System.Windows.Media.Imaging.RenderTargetBitmap renderTarget = myParent.GetViewPortAsImage(DiagramSizeX, DiagramSizeY);
System.Windows.Media.Imaging.BitmapEncoder encoder = new System.Windows.Media.Imaging.PngBitmapEncoder();
MemoryStream myStream = new MemoryStream();

encoder.Frames.Add(System.Windows.Media.Imaging.BitmapFrame.Create(renderTarget));
encoder.Save(myStream);
//
System.Drawing.Bitmap pg = new System.Drawing.Bitmap(DiagramSizeX, DiagramSizeY);
System.Drawing.Graphics gr = System.Drawing.Graphics.FromImage(pg);
//
// Background
//
gr.FillRectangle(new System.Drawing.SolidBrush(BKGC), 0, 0, DiagramSizeX, DiagramSizeY);
//
gr.DrawImage(System.Drawing.Bitmap.FromStream(myStream), 0, 0);
System.Windows.Forms.Clipboard.SetDataObject(pg, true);

sheet.Paste(range);

---

也许我不太理解这个问题，但是您想将RenderTargetBitmap复制到剪贴板，您不能调用SetImage吗

    Dim iRT As RenderTargetBitmap = makeImage() //this is what you do to get the rendertargetbitmap
    If iRT Is Nothing Then Exit Sub
    Clipboard.SetImage(iRT)

---

您可以将

渲染目标位图中的像素直接复制到新
位图的像素缓冲区中。请注意，我假设您的
RenderTargetBitmap
使用
PixelFormats.Pbrga32
，因为使用任何其他像素格式都会从
RenderTargetBitmap
的构造函数引发异常

var bitmap = new Bitmap(renderTarget.PixelWidth, renderTarget.PixelHeight,
    PixelFormat.Format32bppPArgb);

var bitmapData = bitmap.LockBits(new Rectangle(Point.Empty, bitmap.Size),
    ImageLockMode.WriteOnly, bitmap.PixelFormat);

renderTarget.CopyPixels(Int32Rect.Empty, bitmapData.Scan0,
    bitmapData.Stride*bitmapData.Height, bitmapData.Stride);

bitmap.UnlockBits(bitmapData);