从WPF应用程序窗口获取位图？

Question

Winforms System.Windows.Forms.Control类有一个实例方法“DrawToBitmap”。我认为在各种情况下非常有用。我想知道是否有一种从WPF应用程序获取System.Drawing.Bitmap的等效方法？

我意识到我可以做一些P / Invoke的东西来获取应用程序窗口，但我不喜欢这个，因为它不能很好地适应64位转换，并且不允许我只渲染子控件，就像DrawToBitmap那样。

谢谢， 理查德

Answer 1

在MSDN上使用RenderTargetBitmap

RenderTargetBitmap bitmap = new RenderTargetBitmap(width, height, 96, 96, PixelFormats.Pbgra32);
bitmap.Render(this.YourVisualControlNameGoesHere); 

Answer 2

TFD是现货。 您还可以使用MSDN中不那么优雅的参考示例：

Dim width As Integer = 128
Dim height As Integer = width
Dim stride As Integer = CType(width / 8, Integer)
Dim pixels(height * stride) As Byte

' Try creating a new image with a custom palette.
Dim colors As New List(Of System.Windows.Media.Color)()
colors.Add(System.Windows.Media.Colors.Red)
colors.Add(System.Windows.Media.Colors.Blue)
colors.Add(System.Windows.Media.Colors.Green)
Dim myPalette As New BitmapPalette(Colors)

' Creates a new empty image with the pre-defined palette
Dim image As BitmapSource = System.Windows.Media.Imaging.BitmapSource.Create(width, height, 96, 96, PixelFormats.Indexed1, myPalette, pixels, stride)
Dim stream As New FileStream("new.bmp", FileMode.Create)
Dim encoder As New BmpBitmapEncoder()
Dim myTextBlock As New TextBlock()
myTextBlock.Text = "Codec Author is: " + encoder.CodecInfo.Author.ToString()
encoder.Frames.Add(BitmapFrame.Create(image))
encoder.Save(stream)