System windows controls image system drawing image

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  • Question

  • Hi Experts,

    I tried to convert image from ‘System.Windows.Controls.Image’ to ‘System.Drawing.Image’. using the following code.

    ImageConverter converter = new ImageConverter();
    var imge = (System.Drawing.Image)converter.ConvertTo(image, typeof(System.Drawing.Image));

    but am getting the following error.

    ‘ImageConverter’ is unable to convert ‘System.Windows.Controls.Image’ to ‘System.Drawing.Image’.

    Please help me anybody.

    -Ramesh

Answers

  • private System.Windows.Controls.Image ConvertDrawingImageToWPFImage(System.Drawing.Image gdiImg)
{


System.Windows.Controls.Image img = new System.Windows.Controls.Image();

//convert System.Drawing.Image to WPF image
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(gdiImg);
IntPtr hBitmap = bmp.GetHbitmap();
System.Windows.Media.ImageSource WpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());

img.Source = WpfBitmap;
img.Width = 500;
img.Height = 600;
img.Stretch = System.Windows.Media.Stretch.Fill;
return img;
}

    If this post answers your question, please click Mark As Answer. If this post is helpful please click
    Mark as Helpful.

    Regards,
    Nairs

    • Proposed as answer by

      Friday, July 6, 2012 4:26 AM

    • Marked as answer by
      Jason Dot Wang
      Thursday, July 12, 2012 9:06 AM

Источник

Skip to content

We can easily convert a “System.Windows.Controls.Image” to “System.Drawing.Image” by using the following code.

BitmapImage bi = new BitmapImage(new Uri(“pack://application:,,,/Assembly;component/Image.png”, UriKind.Absolute));

System.Windows.Media .Image oldImage = new Image();

image.Source = bi;

MemoryStream ms = new MemoryStream();

System.Windows.Media.Imaging.BmpBitmapEncoder bbe = new BmpBitmapEncoder();

bbe.Frames.Add(BitmapFrame.Create(new Uri(image.Source.ToString(), UriKind.RelativeOrAbsolute)));

bbe.Save(ms);

System.Drawing.Image newImage = System.Drawing.Image.FromStream(ms);

This is the way to convert “System.Windows.Controls.Image ” to “System.Drawing.Image” .

To know more about “System.Windows.Controls.Image” : http://msdn.microsoft.com/en-us/library/system.windows.controls.image.aspx

To know more about “System.Drawing.Image” : http://msdn.microsoft.com/en-us/library/system.drawing.image.aspx

Источник

6 / 6 / 3

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1

.NET 4.x

17.11.2015, 18:16. Показов 5685. Ответов 3

Как отобразить картинку в System.Drawing.Image на контрол Image?

Добавлено через 21 час 47 минут
Все еше нужна помошь…

__________________
Помощь в написании контрольных, курсовых и дипломных работ, диссертаций здесь



0

Bar-bar1an

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Регистрация: 12.12.2014

Сообщений: 50

25.11.2015, 23:00

2

Лучший ответ Сообщение было отмечено Hellcat как решение

Решение

C# 
1

image.Source = new DrawingImage(aDrawingGroup);

image — name of Image control
справка по DrawingImage — > https://msdn.microsoft.com/ru-… .110).aspx



0

C# Junior

3 / 2 / 1

Регистрация: 09.12.2018

Сообщений: 122

21.12.2018, 14:36

3

А какой язык?
C# я не знаю, но если проблема в импорте изображений то:
Чтобы импортировать изображение нужно зайти в свойства PictureBoxа, найти Image нажать …, файл ресурсов приложения, и импортировать картинку.



0

Рядовой

1476 / 875 / 319

Регистрация: 17.05.2015

Сообщений: 3,348

21.12.2018, 23:00

4

Hellcat,

C# 
1
2
3
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5
6
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 using (var stream = new MemoryStream())
                    {
                        bitmapGDI.Save(stream, ImageFormat.Bmp);// bitmapGDI - твой System.Drawing.Image
                        BitmapImage bitmap = new BitmapImage();
                        bitmap.BeginInit();
                        bitmap.StreamSource = new MemoryStream(stream.ToArray());
                        bitmap.EndInit();
 
                        return bitmap; // bitmap - это WPF'овский BitmapImage
                    };

Добавлено через 2 минуты
а тю, зачем поднимать темы 15 года?



0
Источник

I was struck with the problem of converting a System.Drawing.Image type Image to System.Windows.Controls.Image. It was very difficult to find relevant resources on the Internet. So I thought of sharing the method for the benefits of everyone.

It works perfectly for me!!.

private System.Windows.Controls.Image ConvertDrawingImageToWPFImage(System.Drawing.Image gdiImg)
{

System.Windows.Controls.Image img = new System.Windows.Controls.Image();

//convert System.Drawing.Image to WPF image
System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(gdiImg);
IntPtr hBitmap = bmp.GetHbitmap();
System.Windows.Media.ImageSource WpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());

img.Source = WpfBitmap;
img.Width = 500;
img.Height = 600;
img.Stretch = System.Windows.Media.Stretch.Fill;
return img;
}

Источник
title description ms.date ms.topic helpviewer_keywords ms.assetid

Drawing Objects Overview

Get acquainted with objects and how to use them to efficiently draw shapes, bitmaps, text, and media in Windows Presentation Foundation (WPF).

03/30/2017

overview

ImageDrawing objects [WPF]

GlyphRunDrawing objects [WPF]

GeometryDrawing objects [WPF]

drawings [WPF], about drawings

Drawing objects [WPF]

DrawingGroup objects [WPF]

9b5ce5c0-e204-4320-a7a8-0b2210d62f88

This topic introduces xref:System.Windows.Media.Drawing objects and describes how to use them to efficiently draw shapes, bitmaps, text, and media. Use xref:System.Windows.Media.Drawing objects when you create clip art, paint with a xref:System.Windows.Media.DrawingBrush, or use xref:System.Windows.Media.Visual objects.

What Is a Drawing Object

A xref:System.Windows.Media.Drawing object describes visible content, such as a shape, bitmap, video, or a line of text. Different types of drawings describe different types of content. The following is a list of the different types of drawing objects.

  • xref:System.Windows.Media.GeometryDrawing – Draws a shape.

  • xref:System.Windows.Media.ImageDrawing – Draws an image.

  • xref:System.Windows.Media.GlyphRunDrawing – Draws text.

  • xref:System.Windows.Media.VideoDrawing – Plays an audio or video file.

  • xref:System.Windows.Media.DrawingGroup – Draws other drawings. Use a drawing group to combine other drawings into a single composite drawing.

xref:System.Windows.Media.Drawing objects are versatile; there are many ways you can use a xref:System.Windows.Media.Drawing object.

  • You can display it as an image by using a xref:System.Windows.Media.DrawingImage and an xref:System.Windows.Controls.Image control.

  • You can use it with a xref:System.Windows.Media.DrawingBrush to paint an object, such as the xref:System.Windows.Controls.Page.Background%2A of a xref:System.Windows.Controls.Page.

  • You can use it to describe the appearance of a xref:System.Windows.Media.DrawingVisual.

  • You can use it to enumerate the contents of a xref:System.Windows.Media.Visual.

WPF provides other types of objects that are capable of drawing shapes, bitmaps, text, and media. For example, you can also use xref:System.Windows.Shapes.Shape objects to draw shapes, and the xref:System.Windows.Controls.MediaElement control provides another way to add video to your application. So when should you use xref:System.Windows.Media.Drawing objects? When you can sacrifice framework level features to gain performance benefits or when you need xref:System.Windows.Freezable features. Because xref:System.Windows.Media.Drawing objects lack support for Layout, input, and focus, they provide performance benefits that make them ideal for describing backgrounds, clip art, and for low-level drawing with xref:System.Windows.Media.Visual objects.

Because they are a type xref:System.Windows.Freezable object, xref:System.Windows.Media.Drawing objects gain several special features, which include the following: they can be declared as resources, shared among multiple objects, made read-only to improve performance, cloned, and made thread-safe. For more information about the different features provided by xref:System.Windows.Freezable objects, see the Freezable Objects Overview.

Draw a Shape

To draw a shape, you use a xref:System.Windows.Media.GeometryDrawing. A geometry drawing’s xref:System.Windows.Media.GeometryDrawing.Geometry%2A property describes the shape to draw, its xref:System.Windows.Media.GeometryDrawing.Brush%2A property describes how the interior of the shape should be painted, and its xref:System.Windows.Media.GeometryDrawing.Pen%2A property describes how its outline should be drawn.

The following example uses a xref:System.Windows.Media.GeometryDrawing to draw a shape. The shape is described by a xref:System.Windows.Media.GeometryGroup and two xref:System.Windows.Media.EllipseGeometry objects. The shape’s interior is painted with a xref:System.Windows.Media.LinearGradientBrush and its outline is drawn with a xref:System.Windows.Media.Brushes.Black%2A xref:System.Windows.Media.Pen.

This example creates the following xref:System.Windows.Media.GeometryDrawing.

A GeometryDrawing of two ellipses
A GeometryDrawing

[!code-csharpDrawingMiscSnippets_snip#GeometryDrawingExampleInline]
[!code-xamlDrawingMiscSnippets_snip#GeometryDrawingExampleInline]

For the complete example, see Create a GeometryDrawing.

Other xref:System.Windows.Media.Geometry classes, such as xref:System.Windows.Media.PathGeometry enable you to create more complex shapes by creating curves and arcs. For more information about xref:System.Windows.Media.Geometry objects, see the Geometry Overview.

For more information about other ways to draw shapes that don’t use xref:System.Windows.Media.Drawing objects, see Shapes and Basic Drawing in WPF Overview.

Draw an Image

To draw an image, you use an xref:System.Windows.Media.ImageDrawing. An xref:System.Windows.Media.ImageDrawing object’s xref:System.Windows.Media.ImageDrawing.ImageSource%2A property describes the image to draw, and its xref:System.Windows.Media.ImageDrawing.Rect%2A property defines the region where the image is drawn.

The following example draws an image into a rectangle located at (75,75) that is 100 by 100 pixel. The following illustration shows the xref:System.Windows.Media.ImageDrawing created by the example. A gray border was added to show the bounds of the xref:System.Windows.Media.ImageDrawing.

A 100 by 100 ImageDrawing drawn at (75,75)
A 100 by 100 ImageDrawing

[!code-csharpDrawingMiscSnippets_snip#ImageDrawing100by100Inline]
[!code-xamlDrawingMiscSnippets_snip#ImageDrawing100by100Inline]

For more information about images, see the Imaging Overview.

Play Media (Code Only)

[!NOTE]
Although you can declare a xref:System.Windows.Media.VideoDrawing in Extensible Application Markup Language (XAML), you can only load and play its media using code. To play video in Extensible Application Markup Language (XAML), use a xref:System.Windows.Controls.MediaElement instead.

To play an audio or video file, you use a xref:System.Windows.Media.VideoDrawing and a xref:System.Windows.Media.MediaPlayer. There are two ways to load and play media. The first is to use a xref:System.Windows.Media.MediaPlayer and a xref:System.Windows.Media.VideoDrawing by themselves, and the second way is to create your own xref:System.Windows.Media.MediaTimeline to use with the xref:System.Windows.Media.MediaPlayer and xref:System.Windows.Media.VideoDrawing.

[!NOTE]
When distributing media with your application, you cannot use a media file as a project resource, like you would an image. In your project file, you must instead set the media type to Content and set CopyToOutputDirectory to PreserveNewest or Always.

To play media without creating your own xref:System.Windows.Media.MediaTimeline, you perform the following steps.

  1. Create a xref:System.Windows.Media.MediaPlayer object.

    [!code-csharpDrawingMiscSnippets_snip#VideoDrawingExampleInline1]

  2. Use the xref:System.Windows.Media.MediaPlayer.Open%2A method to load the media file.

    [!code-csharpDrawingMiscSnippets_snip#VideoDrawingExampleInline2]

  3. Create a xref:System.Windows.Media.VideoDrawing.

    [!code-csharpDrawingMiscSnippets_snip#VideoDrawingExampleInline3]

  4. Specify the size and location to draw the media by setting the xref:System.Windows.Media.VideoDrawing.Rect%2A property of the xref:System.Windows.Media.VideoDrawing.

    [!code-csharpDrawingMiscSnippets_snip#VideoDrawingExampleInline4]

  5. Set the xref:System.Windows.Media.VideoDrawing.Player%2A property of the xref:System.Windows.Media.VideoDrawing with the xref:System.Windows.Media.MediaPlayer you created.

    [!code-csharpDrawingMiscSnippets_snip#VideoDrawingExampleInline5]

  6. Use the xref:System.Windows.Media.MediaPlayer.Play%2A method of the xref:System.Windows.Media.MediaPlayer to start playing the media.

    [!code-csharpDrawingMiscSnippets_snip#VideoDrawingExampleInline6]

The following example uses a xref:System.Windows.Media.VideoDrawing and a xref:System.Windows.Media.MediaPlayer to play a video file once.

[!code-csharpDrawingMiscSnippets_snip#VideoDrawingExampleInline]

To gain additional timing control over the media, use a xref:System.Windows.Media.MediaTimeline with the xref:System.Windows.Media.MediaPlayer and xref:System.Windows.Media.VideoDrawing objects. The xref:System.Windows.Media.MediaTimeline enables you to specify whether the video should repeat. To use a xref:System.Windows.Media.MediaTimeline with a xref:System.Windows.Media.VideoDrawing, you perform the following steps:

  1. Declare the xref:System.Windows.Media.MediaTimeline and set its timing behaviors.

    [!code-csharpDrawingMiscSnippets_snip#RepeatingVideoDrawingExampleInline1]

  2. Create a xref:System.Windows.Media.MediaClock from the xref:System.Windows.Media.MediaTimeline.

    [!code-csharpDrawingMiscSnippets_snip#RepeatingVideoDrawingExampleInline2]

  3. Create a xref:System.Windows.Media.MediaPlayer and use the xref:System.Windows.Media.MediaClock to set its xref:System.Windows.Media.MediaPlayer.Clock%2A property.

    [!code-csharpDrawingMiscSnippets_snip#RepeatingVideoDrawingExampleInline3]

  4. Create a xref:System.Windows.Media.VideoDrawing and assign the xref:System.Windows.Media.MediaPlayer to the xref:System.Windows.Media.VideoDrawing.Player%2A property of the xref:System.Windows.Media.VideoDrawing.

    [!code-csharpDrawingMiscSnippets_snip#RepeatingVideoDrawingExampleInline4]

The following example uses a xref:System.Windows.Media.MediaTimeline with a xref:System.Windows.Media.MediaPlayer and a xref:System.Windows.Media.VideoDrawing to play a video repeatedly.

[!code-csharpDrawingMiscSnippets_snip#RepeatingVideoDrawingExampleInline]

Note that, when you use a xref:System.Windows.Media.MediaTimeline, you use the interactive xref:System.Windows.Media.Animation.ClockController returned from the xref:System.Windows.Media.Animation.Clock.Controller%2A property of the xref:System.Windows.Media.MediaClock to control media playback instead of the interactive methods of xref:System.Windows.Media.MediaPlayer.

Draw Text

To draw text, you use a xref:System.Windows.Media.GlyphRunDrawing and a xref:System.Windows.Media.GlyphRun. The following example uses a xref:System.Windows.Media.GlyphRunDrawing to draw the text «Hello World».

[!code-csharpDrawingMiscSnippets_snip#GlyphRunDrawingExampleInline]
[!code-xamlDrawingMiscSnippets_snip#GlyphRunDrawingExampleInline]

A xref:System.Windows.Media.GlyphRun is a low-level object intended for use with fixed-format document presentation and print scenarios. A simpler way to draw text to the screen is to use a xref:System.Windows.Controls.Label or a xref:System.Windows.Controls.TextBlock. For more information about xref:System.Windows.Media.GlyphRun, see the Introduction to the GlyphRun Object and Glyphs Element overview.

Composite Drawings

A xref:System.Windows.Media.DrawingGroup enables you to combine multiple drawings into a single composite drawing. By using a xref:System.Windows.Media.DrawingGroup, you can combine shapes, images, and text into a single xref:System.Windows.Media.Drawing object.

The following example uses a xref:System.Windows.Media.DrawingGroup to combine two xref:System.Windows.Media.GeometryDrawing objects and an xref:System.Windows.Media.ImageDrawing object. This example produces the following output.

A DrawingGroup with multiple drawings
A composite drawing

[!code-csharpDrawingMiscSnippets_snip#GraphicsMMSimpleDrawingGroupExample]
[!code-xamlDrawingMiscSnippets_snip#GraphicsMMSimpleDrawingGroupExample]

A xref:System.Windows.Media.DrawingGroup also enables you to apply opacity masks, transforms, bitmap effects, and other operations to its contents. xref:System.Windows.Media.DrawingGroup operations are applied in the following order: xref:System.Windows.Media.DrawingGroup.OpacityMask%2A, xref:System.Windows.Media.DrawingGroup.Opacity%2A, xref:System.Windows.Media.DrawingGroup.BitmapEffect%2A, xref:System.Windows.Media.DrawingGroup.ClipGeometry%2A, xref:System.Windows.Media.DrawingGroup.GuidelineSet%2A, and then xref:System.Windows.Media.DrawingGroup.Transform%2A.

The following illustration shows the order in which xref:System.Windows.Media.DrawingGroup operations are applied.

DrawingGroup order of operations
Order of DrawingGroup operations

The following table describes the properties you can use to manipulate a xref:System.Windows.Media.DrawingGroup object’s contents.

Property Description Illustration
xref:System.Windows.Media.DrawingGroup.OpacityMask%2A Alters the opacity of selected portions of the xref:System.Windows.Media.DrawingGroup contents. For an example, see How to: Control the Opacity of a Drawing. A DrawingGroup with an opacity mask
xref:System.Windows.Media.DrawingGroup.Opacity%2A Uniformly changes the opacity of the xref:System.Windows.Media.DrawingGroup contents. Use this property to make a xref:System.Windows.Media.Drawing transparent or partially transparent. For an example, see How to: Apply an Opacity Mask to a Drawing. DrawingGroups with different opacity settings
xref:System.Windows.Media.DrawingGroup.BitmapEffect%2A Applies a xref:System.Windows.Media.Effects.BitmapEffect to the xref:System.Windows.Media.DrawingGroup contents. For an example, see How to: Apply a BitmapEffect to a Drawing. DrawingGroup with a BlurBitmapEffect
xref:System.Windows.Media.DrawingGroup.ClipGeometry%2A Clips the xref:System.Windows.Media.DrawingGroup contents to a region you describe using a xref:System.Windows.Media.Geometry. For an example, see How to: Clip a Drawing . DrawingGroup with a defined clip region
xref:System.Windows.Media.DrawingGroup.GuidelineSet%2A Snaps device independent pixels to device pixels along the specified guidelines. This property is useful for ensuring that finely detailed graphics render sharply on low-DPI displays. For an example, see Apply a GuidelineSet to a Drawing. A DrawingGroup with and without a GuidelineSet
xref:System.Windows.Media.DrawingGroup.Transform%2A Transforms the xref:System.Windows.Media.DrawingGroup contents. For an example, see How to: Apply a Transform to a Drawing. A rotated DrawingGroup

Display a Drawing as an Image

To display a xref:System.Windows.Media.Drawing with an xref:System.Windows.Controls.Image control, use a xref:System.Windows.Media.DrawingImage as the xref:System.Windows.Controls.Image control’s xref:System.Windows.Controls.Image.Source%2A and set the xref:System.Windows.Media.DrawingImage object’s xref:System.Windows.Media.DrawingImage.Drawing%2A?displayProperty=nameWithType property to the drawing you want to display.

The following example uses a xref:System.Windows.Media.DrawingImage and an xref:System.Windows.Controls.Image control to display a xref:System.Windows.Media.GeometryDrawing. This example produces the following output.

A GeometryDrawing of two ellipses
A DrawingImage

[!code-csharpDrawingMiscSnippets_snip#DrawingImageExampleWholePage]
[!code-xamlDrawingMiscSnippets_snip#DrawingImageExampleWholePage]

Paint an Object with a Drawing

A xref:System.Windows.Media.DrawingBrush is a type of brush that paints an area with a drawing object. You can use it to paint just about any graphical object with a drawing. The xref:System.Windows.Media.Drawing property of a xref:System.Windows.Media.DrawingBrush describes its xref:System.Windows.Media.DrawingBrush.Drawing%2A. To render a xref:System.Windows.Media.Drawing with a xref:System.Windows.Media.DrawingBrush, add it to the brush using the brush’s xref:System.Windows.Media.Drawing property and use the brush to paint a graphical object, such as a control or panel.

The following examples uses a xref:System.Windows.Media.DrawingBrush to paint the xref:System.Windows.Shapes.Shape.Fill%2A of a xref:System.Windows.Shapes.Rectangle with a pattern created from a xref:System.Windows.Media.GeometryDrawing. This example produces the following output.

A tiled DrawingBrush
A GeometryDrawing used with a DrawingBrush

[!code-csharpDrawingMiscSnippets_snip#DrawingBrushExampleWholePage]
[!code-xamlDrawingMiscSnippets_snip#DrawingBrushExampleWholePage]

The xref:System.Windows.Media.DrawingBrush class provides a variety of options for stretching and tiling its content. For more information about xref:System.Windows.Media.DrawingBrush, see the Painting with Images, Drawings, and Visuals overview.

Render a Drawing with a Visual

A xref:System.Windows.Media.DrawingVisual is a type of visual object designed to render a drawing. Working directly at the visual layer is an option for developers who want to build a highly customized graphical environment, and is not described in this overview. For more information, see the Using DrawingVisual Objects overview.

DrawingContext Objects

The xref:System.Windows.Media.DrawingContext class enables you to populate a xref:System.Windows.Media.Visual or a xref:System.Windows.Media.Drawing with visual content. Many such lower-level graphics objects use a xref:System.Windows.Media.DrawingContext because it describes graphical content very efficiently.

Although the xref:System.Windows.Media.DrawingContext draw methods appear similar to the draw methods of the xref:System.Drawing.Graphics?displayProperty=nameWithType type, they are actually very different. xref:System.Windows.Media.DrawingContext is used with a retained mode graphics system, while the xref:System.Drawing.Graphics?displayProperty=nameWithType type is used with an immediate mode graphics system. When you use a xref:System.Windows.Media.DrawingContext object’s draw commands, you are actually storing a set of rendering instructions (although the exact storage mechanism depends on the type of object that supplies the xref:System.Windows.Media.DrawingContext) that will later be used by the graphics system; you are not drawing to the screen in real-time. For more information about how the Windows Presentation Foundation (WPF) graphics system works, see the WPF Graphics Rendering Overview.

You never directly instantiate a xref:System.Windows.Media.DrawingContext; you can, however, acquire a drawing context from certain methods, such as xref:System.Windows.Media.DrawingGroup.Open%2A?displayProperty=nameWithType and xref:System.Windows.Media.DrawingVisual.RenderOpen%2A?displayProperty=nameWithType.

Enumerate the Contents of a Visual

In addition to their other uses, xref:System.Windows.Media.Drawing objects also provide an object model for enumerating the contents of a xref:System.Windows.Media.Visual.

The following example uses the xref:System.Windows.Media.VisualTreeHelper.GetDrawing%2A method to retrieve the xref:System.Windows.Media.DrawingGroup value of a xref:System.Windows.Media.Visual and enumerate it.

[!code-csharpDrawingMiscSnippets_snip#GraphicsMMRetrieveDrawings]

See also

  • xref:System.Windows.Media.Drawing
  • xref:System.Windows.Media.DrawingGroup
  • 2D Graphics and Imaging
  • Painting with Images, Drawings, and Visuals
  • Geometry Overview
  • Shapes and Basic Drawing in WPF Overview
  • WPF Graphics Rendering Overview
  • Freezable Objects Overview
  • How-to Topics
Источник

You may want to work with the image from an Image control as a standard Windows bitmap.  You can convert the System.Windows.Controls.Image to a System.Drawing.Bitmap as follows (imgLife is an Image control):

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            RenderTargetBitmap rtBmp = new RenderTargetBitmap((int)imgLife.ActualWidth, (int)imgLife.ActualHeight,
                96.0, 96.0, PixelFormats.Pbgra32);

            imgLife.Measure(new System.Windows.Size((int)imgLife.ActualWidth, (int)imgLife.ActualHeight));
            imgLife.Arrange(new Rect(new System.Windows.Size((int)imgLife.ActualWidth, (int)imgLife.ActualHeight)));

            rtBmp.Render(imgLife);

            PngBitmapEncoder encoder = new PngBitmapEncoder();
            MemoryStream stream = new MemoryStream();
            encoder.Frames.Add(BitmapFrame.Create(rtBmp));

            // Save to memory stream and create Bitamp from stream
            encoder.Save(stream);
            System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(stream);

            // Demonstrate that we can do something with the Bitmap
            bitmap.Save(@"D:TempLife.png", ImageFormat.Png);

            // Optionally, if we didn't need Bitmap object, but
            // just wanted to render to file, we could:
            //encoder.Save(new FileStream(@"D:TempLife-Other.png", FileMode.Create));
        }

Источник

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