Is there a way to convert a System.IO.Stream to a Windows.Storage.Streams.IRandomAccessStream?

by

To use the extensions: you must add “using System.IO”

In Windows8, .NET and WinRT types are generally converted to/from compatible types under the hood so you don’t have to care about it.

For streams, however, there are helper methods to convert between WinRT and .NET streams:
For converting from WinRT streams -> .NET streams:

InMemoryRandomAccessStream win8Stream = GetData(); // Get a data stream from somewhere.
System.IO.Stream inputStream = win8Stream.AsStream()

For converting from .NET streams -> WinRT streams:

Windows.Storage.Streams.IInputStream inStream = stream.AsInputStream();
Windows.Storage.Streams.IOutputStream outStream = stream.AsOutputStream();

UPDATE: 2013-09-01

Let it not be said that Microsoft doesn’t listen to it’s developer community 😉

In the announcement for .NET FX 4.5.1, Microsoft states that:

Many of you have been wanting a way to convert a .NET Stream to a Windows Runtime IRandomAccessStream. Let’s just call it an AsRandomAccessStream extension method. We weren’t able to get this feature into Windows 8, but it was one of our first additions to Windows 8.1 Preview.

You can now write the following code, to download an image with HttpClient, load it in a BitmapImage and then set as the source for a Xaml Image control.

    //access image via networking i/o
    var imageUrl = "http://www.microsoft.com/global/en-us/news/publishingimages/logos/MSFT_logo_Web.jpg";
    var client = new HttpClient();
    Stream stream = await client.GetStreamAsync(imageUrl);
    var memStream = new MemoryStream();
    await stream.CopyToAsync(memStream);
    memStream.Position = 0;
    var bitmap = new BitmapImage();
    bitmap.SetSource(memStream.AsRandomAccessStream());
    image.Source = bitmap;

HTH.

More Related Contents:

  1. How to shut down the computer from C#
  2. Win32 API function to programmatically enable/disable device
  3. Allowing Untrusted SSL Certificates with HttpClient
  4. How to enumerate all windows belonging to a particular process using .NET?
  5. get the titles of all open windows
  6. Capture screenshot Including Semitransparent windows in .NET
  7. Does C# have an equivalent to JavaScript’s encodeURIComponent()?
  8. How do I determine a mapped drive’s actual path?
  9. How to get the z-order in windows?
  10. How do I disable a system device programmatically?
  11. Creating a temporary directory in Windows?
  12. What’s the best way to calculate the size of a directory in .NET?
  13. Path.Combine absolute with relative path strings
  14. File getting copied to SysWOW64 instead of System32
  15. How to render a WPF UserControl to a bitmap without creating a window
  16. Windows service with timer
  17. C# – Making a Process.Start wait until the process has start-up
  18. Watermark in System.Windows.Forms.TextBox
  19. How do I get information about recently connected USB device?
  20. Wrap C# application in .msi installer
  21. Winforms: Application.Exit vs Environment.Exit vs Form.Close
  22. How to check if another instance of the application is running [duplicate]
  23. Launching a Desktop Application with a Metro-style app
  24. How do I get common file type icons in C#?
  25. “MoveFile” function in C# (Delete file after reboot)
  26. How do I spawn threads on different CPU cores?
  27. Is .NET 4.0 Compatible with Windows XP SP2 or below? [closed]
  28. Domain credentials for a WebClient class don’t work
  29. How do I minimize a WinForms application to the notification area?
  30. Defining a working directory for executing a program (C#)

Leave a Comment