部署IIS后，报错Could not load type 'System.ServiceModel.Activation.HttpModule' from assembly 'System.ServiceModel, Version=3.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

解决方法：重新注册一下 asp.net 4.0：
C:/Windows/Microsoft.NET/Framework/v4.0.30319/aspnet_regiis.exe -i