修复WCF运行错误,Contract接口函数需要OperationContract属性

CSharp/Contract/RealmContract/ICalculator.cs

@@ -5,6 +5,7 @@ namespace RealmContract
 	[ServiceContract(Name = "Calculator", Namespace = "http://www.egametang.com/")]
 	public interface ICalculator
 	{
+		[OperationContract]
 		double Add(double x, double y);
 	}
 }