.NET Compact Framework 3.5 支持 WCF 的子集
.NET Compact Framework 3.5 已经支持 Windows Communication Foundation (WCF)了，这是.NET CF 3.5 最让人兴奋的特性之一。不过，.NET CF 版的 WCF是.NET Framework 3.5 版 WCF 的功能子集。MSDN Library for Visual Studio 2008 Beta 2 (Development Tools and Languages|Visual Studio|.NET Framework Programming in Visual Studio|.NET Compact Framework|Application Development|Windows Communication Foundation (WCF) Development|Messaging in the .NET Compact Framework) 中是这样描述的：
其中 Mail Binding 是很有意思的一个特性，我 以前的随笔有提过。不过这个功能需要跟 Exchange Server 配合使用，有一定的局限性。WCF Exchange Server Mail Transport 使用方法可以参考 MSDN 文档。
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The subset of Windows Communication Foundation (WCF) that is implemented in the .NET Compact Framework provides a unified programming model for building message-oriented applications. It enables developers to build secure messaging applications that work across platforms and that support interaction with existing WCF services on the desktop.
(译文：.NET 精简框架实现了 WCF 的子集，为构建面向消息的应用程序提供了统一的编程模型。这使得开发人员能够构建跨平台的安全的消息应用程序，并且支持跟现有的运行在桌面平台的 WCF 服务交互。)
WCF messaging layer on the .NET Compact Framework
Support for the WS-Security version 1.0 specification includes SOAP message security using X.509 certificates. The Message class is built on the WS-Addressing standard.
MSDN Library for Visual Studio 2008 Beta 2 对 Compact WCF与 Desktop WCF 之间的差异描述得不够详尽，只是简单描述了一下架构和安全方面的不同。
今天发现有人整理了一个比较详细的表格，供大家参考：
| Feature | Desktop WCF | Compact WCF |
| Bindings: | ||
| · BasicHttpBinding | Yes | Yes |
| · CustomBinding | Yes | Yes |
| · WindowsMobileMailBinding | N/A | Yes |
| · ExchangeWebServiceMailBinding | Yes, via NetCF install | Yes |
| Formatters: | ||
| · SoapFormatter | Yes | Yes |
| · BinaryFormatter | Yes | No |
| Encoders: | ||
| · TextMessageEncoder | Yes | Yes |
| · BinaryMessageEncodingBindingElement | Yes | No |
| · MTOMEncoder | Yes | No |
| · GzipEncoder | Sample available | Sample available |
| Transports: | ||
| · HttpTransportBindingElement | Yes | Yes |
| · HttpsTransportBindingElement | Yes | Yes |
| · MailTransportBindingElement | Yes, via NetCF install | Yes |
| · MsmqTransportBindingElement | Yes | No |
| · TcpTransportBindingElement | Yes | No |
| · (other transports) | Yes | No |
| XmlDictionaryReader/Writer | Yes | Yes; stub around XmlTextReader/Writer |
| DataContractSerializer | Yes | No; but can be wire-compatible with DCS via XmlSerializer |
| Service proxy generation | Yes; via SvcUtil.exe | Yes; via NetCFSvcUtil.exe, not integrated into VS2008 |
| · Non-HTTP transports | Yes | No |
| · Custom headers | Yes | No |
| WS-Addressing | Yes | Yes |
| WS-Security message level security | ||
| · X.509 | Yes | Yes |
| · Username/password | Yes | No |
| · SecurityAlgorithmSuite.Basic256Rsa15 | Yes | Yes |
| · SecurityAlgorithmSuite.Basic256 | Yes | No |
| WS-ReliableMessaging | Yes | No |
| Patterns | ||
| · Service model | Yes | No |
| · Message layer programming | Yes | Yes |
| · Buffered messages | Yes | Yes |
| · Streaming messages | Yes | No |
| · Endpoint descriptions in .config files | Yes | No |
| Channel extensibility | Yes | Yes |
| Security channel extensibility | Yes | No |
其中 Mail Binding 是很有意思的一个特性，我 以前的随笔有提过。不过这个功能需要跟 Exchange Server 配合使用，有一定的局限性。WCF Exchange Server Mail Transport 使用方法可以参考 MSDN 文档。