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What's new in WCF 4.5 - Part 8

Internationalized Domain Names support

Internationalized domain name is a domain name that contains non-ASCII characters. Now WCF 4.5 support the IDN. Means ?

  1. Ability to host WCF with IDN name
  2. Client can call the service by using IDN name

Fig 1: Display the config settings

Uri has two properties Host and DnsSafeHost. These properties contain Unicode or Punycode values depending upon the IDN configuration settings

  • "None" - no conversions are performed by Uri.Host or Uri.DnsSafeHos
  • "AllExceptIntranet" - uri.Host remains Unicode and uri.DnsSafeHost is converted to Punycode
  • "All" - uri.DnsSafeHost is converted to Punycode for internet addresses, and remains Unicode for intranet addresses

Note:This setting is not required to be configured for Windows 8 and newer versions.


  • Always create the service with Interface->Implementation format, mention the contract in Interface.
  • Define the service in Class library and refer the class library in Host project. Don’t use service class in host project.
  • Change the instance mode to per call as default.
  • Always catch exception using try/catch block and throw exception using FaultException < T >.
  • Logging and Include exception should be enable while compiling the project in debug mode. While in production deployment disable the logging and Include exception details.