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// <copyright>
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
namespace System.ServiceModel.Channels
{
// In .net 4.0, the WebMessageEncoder uses a raw encoder, different than ByteStreamMessageEncoder. This raw encoder produces Messages for which the
// Message.GetReaderAtBodyContents() method returns an XmlDictionaryReader positioned on content (the root element of the xml); that's because MoveToContent()
// is called on the reader before it's returned.
//
// Starting with .net 4.5, the WebMessageEncoder uses the ByteStreamMessageEncoder. By default, this encoder produces Messages for which the body reader is initially
// positioned on None (just before the root element). It does so for compatibility with .net 4.0. So we need the WebMessageEncoder to create a non-default
// ByteStreamMessageEncoder that triggers the MoveToContent() call. We don't want to expose a direct public way to create this non-default ByteStreamMessageEncoder
// and WebMessageEncoder (from System.ServiceModel.Web.dll) doesn't have access to the internals of ByteStreamMessageEncoder (from System.ServiceModel.Channels.dll).
// So we use this intermediate interface.
//
// This is what we want to have:
// +---------------------+------------------------------------------------------------+--------------------------------------------------------------------------+
// | | WebMessageEncodingBindingElement/WebMessageEncoder is used | ByteStreamMessageEncodingBindingElement/ByteStreamMessageEncoder is used |
// +=====================+============================================================+==========================================================================+
// | .net 4.0 | the Message body reader is initially positioned on content | the Message body reader is initially positioned on None |
// +---------------------+------------------------------------------------------------+--------------------------------------------------------------------------+
// | .net 4.5 (or after) | the Message body reader is initially positioned on content | the Message body reader is initially positioned on None |
// +---------------------+------------------------------------------------------------+--------------------------------------------------------------------------+
//
// See 252277 @ CSDMain for other info.
internal interface IWebMessageEncoderHelper
{
void EnableBodyReaderMoveToContent();
}
}
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