wcf - aspNet兼容性启用="true"

Question

我制作了一个 Azure Web 应用程序，其中包含 ASP.NET Web，其中还包含一些 JSON WCF 服务。我真的对 WCF 服务模型了解不够，无法确保我做得正确，这对您来说正确吗？是否还有其他服务模型配置能够更好地实现可扩展性、最大并发连接数等？

      <system.serviceModel>
        <behaviors>
          <serviceBehaviors>
            <behavior name="">
              <serviceMetadata httpGetEnabled="true" />
              <serviceDebug includeExceptionDetailInFaults="true" />
            </behavior>
          </serviceBehaviors>
        </behaviors>
        <serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true" />
      </system.serviceModel>
  <system.net>
    <settings>
      <!-- See http://social.msdn.microsoft.com/Forums/en-US/windowsazuredata/thread/d84ba34b-b0e0-4961-a167-bbe7618beb83 -->
      <servicePointManager expect100Continue="false" />
    </settings>
  </system.net>  

这可行，但我偶尔会遇到意外的连接丢失(超时)，并且在我的开发环境中没有 HTTP 错误代码，这让我很担心。

更新于 2011 年 11 月 24 日

web.config

  <system.net>
    <connectionManagement>
      <!-- See http://social.msdn.microsoft.com/Forums/en-US/windowsazuredata/thread/d84ba34b-b0e0-4961-a167-bbe7618beb83 -->
      <add address="*" maxconnection="48" />
    </connectionManagement>
  </system.net>  

我怀疑可能是 Visual Studio Web 服务器导致 Ajax 调用超时，几分钟后服务开始再次接受请求。这是我的完整设置，你能看出问题出在哪里吗？我对该服务只有一次 Ajax 调用。

接口(interface)

IExample.cs:

using System.ServiceModel;
using System.ServiceModel.Web;

namespace WebPages.Interfaces
{
    [ServiceContract]
    public interface IExample
    {
        [OperationContract]
        [WebInvoke(Method = "GET",
            ResponseFormat = WebMessageFormat.Json)]
        string GetSomething(string id);
    }
}

ExampleService.svc.cs 标记

<%@ ServiceHost Language="C#" Debug="true" Service="WebPages.Interfaces.ExampleService" CodeBehind="ExampleService.svc.cs" Factory="System.ServiceModel.Activation.WebServiceHostFactory" %>

ExampleService.svc.cs 代码隐藏

namespace WebPages.Interfaces
{
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class ExampleService : IExample
    {
        string JsonSerializeSomething(Something something)
        {
            var serializer = new DataContractJsonSerializer(something.GetType());
            var memoryStream = new MemoryStream();

            serializer.WriteObject(memoryStream, something);

            return Encoding.Default.GetString(memoryStream.ToArray());
        }

        public string GetSomething(string id)
        {
            var something = DoSomeBusinessLogic(id);

            return JsonSerializeSomething(something);
        }
    }
}

来自客户端的 jQuery 调用

function _callServiceInterface(id, delegate) {
    var restApiCall = "Interfaces/ExampleService.svc/GetSomething?id="
            + escape(id);

    $.getJSON(restApiCall, delegate);
}

function _getSomethingFromService() {
    _callServiceInterface('123',
        function (result) {
            var parsedResult = $.parseJSON(result);
            $('#info').html(result.SomethingReturnedFromServiceCall);
        }
    );
}

更新

我想我现在知道问题是什么了；看来WCF服务默认是单线程的(来源:http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=EN-US&k=k(SYSTEM.SERVICEMODEL.SERVICEBEHAVIORATTRIBUTE.CONCURRENCYMODE);k(TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV4.0%22);k(DevLang-CSHARP)&rd=true)。这解释了为什么我的 Ajax 调用会超时，它被另一个线程阻塞。这段代码应该可以更好地工作:

ExampleService.svc.cs

[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple, InstanceContextMode = InstanceContextMode.PerSession,
         IncludeExceptionDetailInFaults = false, MaxItemsInObjectGraph = Int32.MaxValue)]
    //[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class ExampleService : IExample

web.config

 <system.serviceModel>
    <protocolMapping>
      <add scheme="http" binding="webHttpBinding" bindingConfiguration="" />
    </protocolMapping>
    <behaviors>
      <endpointBehaviors>
        <behavior name="">
          <webHttp defaultOutgoingResponseFormat="Json" />
        </behavior>
      </endpointBehaviors>
      <serviceBehaviors>
        <behavior name="">
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" />
  </system.serviceModel>  

ExampleService.svc

<%@ ServiceHost Language="C#" Debug="true" Service="WebPages.Interfaces.TagService" CodeBehind="TagService.svc.cs" %>

2011 年 10 月 9 日更新

我想我在这里得到了我需要的答案 Locking with ConcurrencyMode.Multiple and InstanceContextMode.PerCall

aspNetCompatibilityEnabled="false" 表示无法在我的 WCF 代码中访问 HttpContext、ASP.NET session 等。

Answer 1

我想我在这里得到了我需要的答案 Locking with ConcurrencyMode.Multiple and InstanceContextMode.PerCall

aspNetCompatibilityEnabled="false" 表示无法在我的 WCF 代码中访问 HttpContext、ASP.NET session 等。