How to customize WCF error behavior_问答_开发者

How to customize WCF error behavior

开发者 https://www.devze.com 2023-03-18 08:59 出处：网络

I am creatin开发者_高级运维g a WCF service to provide REST-ful web HTTP service. This is what I want:

相关专题：wcf

I am creatin开发者_高级运维g a WCF service to provide REST-ful web HTTP service. This is what I want:

http://myservice/correct/url

this should return the result in JSON/XML

http://myservice/incorrect/url

this should return a customized error message, instead the standard "Endpoint not found." error.

I read about the IErrorHandler interface, and extending the WebHttpBehavior class. But does not work.

The easiest way to do that is to define operations to handle the "Not Found" cases - by using an UriTemplate of '*' (it will match if no other templates match the incoming request). The code below shows an example of it.

public class Post_0424d917_89cd_43c8_be70_5d4c6934b48c
{
    [ServiceContract]
    public interface ITest
    {
        [WebGet(UriTemplate = "/Echo?text={text}")]
        string EchoGet(string text);
        [WebInvoke(UriTemplate = "/Echo")]
        string EchoPost(string text);
        [WebGet(UriTemplate = "*")]
        Stream ErrorForGet();
        [WebInvoke(UriTemplate = "*")]
        Stream ErrorForPost();
    }
    public class Service : ITest
    {
        public string EchoGet(string text) { return text; }
        public string EchoPost(string text) { return text; }
        public Stream ErrorForPost() { return this.ErrorForGet(); }
        public Stream ErrorForGet()
        {
            WebOperationContext.Current.OutgoingResponse.StatusCode = HttpStatusCode.NotFound;
            WebOperationContext.Current.OutgoingResponse.ContentType = "text/html";
            string result = @"<html>
  <head>
    <title>Resource not found</title>
  </head>
  <body>
    <h1>This resource cannot be found</h1>
  </body>
</html>";
            return new MemoryStream(Encoding.UTF8.GetBytes(result));
        }
    }
    static void SendRequest(string uri, string method, string contentType, string body)
    {
        HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create(uri);
        req.Method = method;
        if (!String.IsNullOrEmpty(contentType))
        {
            req.ContentType = contentType;
        }

        if (body != null)
        {
            byte[] bodyBytes = Encoding.UTF8.GetBytes(body);
            req.GetRequestStream().Write(bodyBytes, 0, bodyBytes.Length);
            req.GetRequestStream().Close();
        }

        HttpWebResponse resp;
        try
        {
            resp = (HttpWebResponse)req.GetResponse();
        }
        catch (WebException e)
        {
            resp = (HttpWebResponse)e.Response;
        }

        Console.WriteLine("HTTP/{0} {1} {2}", resp.ProtocolVersion, (int)resp.StatusCode, resp.StatusDescription);
        foreach (string headerName in resp.Headers.AllKeys)
        {
            Console.WriteLine("{0}: {1}", headerName, resp.Headers[headerName]);
        }

        Console.WriteLine();
        Console.WriteLine(new StreamReader(resp.GetResponseStream()).ReadToEnd());

        Console.WriteLine();
        Console.WriteLine("  *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*  ");
        Console.WriteLine();
    }
    public static void Test()
    {
        string baseAddress = "http://" + Environment.MachineName + ":8000/Service";
        ServiceHost host = new ServiceHost(typeof(Service), new Uri(baseAddress));
        host.AddServiceEndpoint(typeof(ITest), new WebHttpBinding(), "").Behaviors.Add(new WebHttpBehavior());
        host.Open();
        Console.WriteLine("Host opened");

        SendRequest(baseAddress + "/Echo?text=hello", "GET", null, null);
        SendRequest(baseAddress + "/Echo", "POST", "application/json", "\"world\"");

        SendRequest(baseAddress + "/NotFound", "GET", null, null);
        SendRequest(baseAddress + "/NotFound", "POST", "text/xml", "<body/>");

        Console.Write("Press ENTER to close the host");
        Console.ReadLine();
        host.Close();
    }
}