WCF 参数拦截器

WCF 参数拦截器 应用于参数服务参数的校验

通过实现接口IParameterInspector来达到对在调用前或者调用后对参数的拦截作用

具体步骤

1. 新建一个wcf服务应用工程,定义一个服务

    [ServiceContract(Namespace="http://www.swzsoft.cn")]
    public interface IService1 {
        [ParameOperatorBehavior]
        [OperationContract]
        string register_user(string username, string password, int age);
    }

服务接口接口实现

    public class Service1 : IService1 {
        public string register_user(string username, string password, int age) {
            return username + ":" + password + ":" + age.ToString();
        }
    }

从服务契约我们知道该服务实例包含三个参数分别为: 

  username  : string 

  password  : string 

  age         : int

现在通过实现IParameterInspector来实现对该服务实例的参数拦截

    public class ParameInspector : IParameterInspector {
        public void AfterCall(string operationName, object[] outputs, object returnValue, object correlationState) {
            //throw new NotImplementedException();
        }

        public object BeforeCall(string operationName, object[] inputs) {
            if (string.IsNullOrWhiteSpace(inputs[0].ToString()) ||
                inputs[0].ToString().Length > 16) {
                throw new System.ServiceModel.FaultException("UserName");
            }

            if (string.IsNullOrWhiteSpace(inputs[1].ToString()) ||
                inputs[1].ToString().Length > 16) {
                throw new System.ServiceModel.FaultException("Password");
            }

            int age = Convert.ToInt32(inputs[2].ToString());
            if (age < 18) {
                throw new System.ServiceModel.FaultException("Age");
            }

            return null;

        }
    }

    public class ParameOperatorBehavior : Attribute, IOperationBehavior {
        public void AddBindingParameters(OperationDescription operationDescription, System.ServiceModel.Channels.BindingParameterCollection bindingParameters) {
           // throw new NotImplementedException();
        }

        public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation) {
           // throw new NotImplementedException();
        }

        public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation) {
           // throw new NotImplementedException();
            dispatchOperation.ParameterInspectors.Add(new ParameInspector());
        }

        public void Validate(OperationDescription operationDescription) {
            //throw new NotImplementedException();
        }
    }

　　

ParameOperatorBehavior  自定义属性,这里主要实现

IOperationBehavior.ApplyDispatchBehavior添加自定的拦截器