通过服务端的IParameterInspector或IServiceBehavior更改操作输入参数

Question

我正在IParameterInspector验证我的WCF服务操作，如：

  class MyParameterInspector : IParameterInspector
{ 
    public object BeforeCall(string operationName, object[] inputs)
    {
        Token token = CarrierHelper.ReadMessageHeader<Token>();
        //Here change the operation entered parameters or something else
    }
}

我想阅读在Beforecall中制作或操作的参数或值，如：

 public string MyOperation()
    {
        //Here I want to read that parameter which manipulate or make in BeforeCall
    }

实施这种方法是否有好方法或解决方法？

更多解释：

通过IParameterInspector我们可以为每个操作定义一个atrrib来检查用户访问权限，因此我通过IOperationBehavior和IParameterInspector实现了此操作，因此在BeforeCall用户可以检索并检查attrib作为操作权限（操作授权）静态作为枚举，但假设每个操作应该知道如何在资源上运行（资源安全性，行级安全性）资源是动态的我不能将它们定义为静态或硬编码，如权限应该从每个用户的DB读取，我认为也可以实现这一点，但我真的不知道如何？

 public class RemedyBehaviorAttribute : Attribute, IOperationBehavior
{
    public PrimitiveActivity[] PermissionsToCheck { get; set; }
    public RemedyBehaviorAttribute(params PrimitiveActivity[] pi)
    {
        PermissionsToCheck = pi;
    }
    public void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection<ServiceEndpoint> endpoints, BindingParameterCollection bindingParameters)
    {
    }

    public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { }

    public void AddBindingParameters(OperationDescription operationDescription,
        BindingParameterCollection bindingParameters)
    {
    }

    public void ApplyClientBehavior(OperationDescription operationDescription,
        ClientOperation clientOperation)
    {
        RemedyParameterInspector paramInspector = new RemedyParameterInspector
        {
            Permissions = PermissionsToCheck
        };
        clientOperation.ParameterInspectors.Add(paramInspector);
    }

    public void ApplyDispatchBehavior(OperationDescription operationDescription,
        DispatchOperation dispatchOperation)
    {
        RemedyParameterInspector paramInspector = new RemedyParameterInspector
        {
            Permissions = PermissionsToCheck
        };
        dispatchOperation.ParameterInspectors.Add(paramInspector);
    }

    public void Validate(OperationDescription operationDescription)
    {
    }
}

class RemedyParameterInspector : IParameterInspector
{
    public PrimitiveActivity[] Permissions { get; set; }
    public void AfterCall(string operationName, object[] outputs, object returnValue, object correlationState)
    {
    }

    public object BeforeCall(string operationName, object[] inputs)
    {
        Token token = CarrierHelper.ReadMessageHeader<Token>();
        bool hasAccess = Permissions.Any(x => token.HasAccess(x));
        if (!hasAccess)
            throw new Exception(string.Format("Response to end user get failed, User:{0} have not access to operation:{1}...", token.UserGUID, operationName));
        return null;
    }

    private void SetLoggingContext(object[] inputs, MethodInfo mi)
    {
    } 
    private void CreateArgumentForInvokeLog(MethodInfo mi, object[] inputs)
    {

    }
    private void CreateArgumentForResultLog(MethodInfo mi, object[] outputs, object returnValue)
    {

    }

}

并使用：

 [RemedyBehavior(PrimitiveActivity.Search, PrimitiveActivity.ManageExam)]
    public DTO_OUT Search(DTO_IN find_DTO_IN)
    {
    }

提前致谢。