WCF 和 MVC Web API 在 ZD7EFA19FBE7D2372FD5ADB60242 中的通用请求响应拦截器

Question

Some Background: We have lot of Web APIs and Services projects, Some of them are in WCF and some of them are in MVC Web API framework. 我的意图是为所有这些开发一个通用的请求/响应拦截器库，它可以记录请求和响应我在实际项目中所做的简约更改。 我知道我们可以使用 MVC Web API 的 ActionFilters 和 WCF 中的 MessageInspector 来完成这个任务。

我的问题：是否可以为 MVC WebAPI 和 WCF 服务创建一个通用的请求/响应拦截器库？ 如果不是，我认为我必须创建两个不同的库来实现我的目标。

Answer 1

在客户端实现 IClientMessageInspector 接口，在服务器端实现 IDispatchMessageInspector 接口。 您可以拦截请求和回复。

这是客户端上的示例代码：

  public class ClientMessageLogger : IClientMessageInspector
{
    public void AfterReceiveReply(ref Message reply, object correlationState)
    {
        string outputstr = $"Server reply message received by the client:\n{reply}\n";
        Console.WriteLine(outputstr);
    }

    public object BeforeSendRequest(ref Message request, IClientChannel channel)
    {
        string outputText = $"The request message that the client will send:\n{request}\n";
        Console.WriteLine(outputText);
        return null;

    }
}
[AttributeUsage(AttributeTargets.Interface)]
public class CustomBehavior : Attribute, IContractBehavior
{
    public Type TargetContract => typeof(ServiceReference1.ICalculator);
    public void AddBindingParameters(ContractDescription contractDescription, ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
    {
        return;
    }

    public void ApplyClientBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, ClientRuntime clientRuntime)
    {
        clientRuntime.ClientMessageInspectors.Add(new ClientMessageLogger());
    }
    public void ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime)
    {
        return;
    }

    public void Validate(ContractDescription contractDescription, ServiceEndpoint endpoint)
    {
        return;
    }
}

这是服务器上的示例代码：

 public class CustomMessageInspector : IDispatchMessageInspector
    {
        public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
        {
            string displayText = $"The request message received by the server:\n{request}\n";
            Console.WriteLine(displayText);
            return null;
        }

        public void BeforeSendReply(ref Message reply, object correlationState)
        {
            string displayText = $"Server reply message:\n{reply}\n";
            Console.WriteLine(displayText);
        }
    }
    [AttributeUsage(AttributeTargets.Interface)]
    public class CustomBehavior : Attribute, IContractBehavior
    {
        public void AddBindingParameters(ContractDescription contractDescription, ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
        {
            return;
        }

        public void ApplyClientBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, ClientRuntime clientRuntime)
        {
            return;
        }
        public void ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime)
        {
            dispatchRuntime.MessageInspectors.Add(new CustomMessageInspector());
        }

        public void Validate(ContractDescription contractDescription, ServiceEndpoint endpoint)
        {
            return;
        }
    }

最后，需要在界面上方应用[CustomBehavior] 。