Metro各种流转换

Ibuffer转byte[] 

byte[] bytes=WindowsRuntimeBufferExtensions.ToArray(buffer,,(int)buffer.Length); 

Byte[]转Ibuffer 

WindowsRuntimeBufferExtensions.AsBuffer(bytes,,bytes.Length); 

IRandomAccessStream转 Stream

Stream stream=WindowsRuntimeStreamExtensions.AsStreamForRead(randomStream.GetInputStreamAt(0));

Ibuffer转Stream

Stream stream = WindowsRuntimeBufferExtensions.AsStream(buffer);

Byte转Stream

Stream stream = new MemoryStream(bytes);

IRandomAccessStream转FileInputStream

FileInputStream inputStream=randomStream.GetInputStreamAt(0) as FileInputStream;

IRandomAccessStream转FileOutputStream

FileOutputStream outStream= randomStream.GetOutputStreamAt(0) as FileOutputStream;

参考：http://www.cnblogs.com/jing870812/archive/2012/04/12/2444870.html