Question

当我尝试直接从Web应用程序访问Windows服务中托管的WCF服务时出现问题，我无法理解我做错了什么。

我尝试了我发现的所有建议，但没有任何帮助。我使用AngularJs，但这并不重要，我接受所有建议。

有我的项目：https://github.com/djromix/Portal.WorckFlow

Portal.Services是Windows服务。

这是我的Windows服务配置：

<system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />
    <httpProtocol>
      <customHeaders>
        <add name="Access-Control-Allow-Origin" value="*" />
        <add name="Access-Control-Allow-Headers" value="Content-Type" />
      </customHeaders>
    </httpProtocol>
</system.webServer>
<system.serviceModel>
    <behaviors>
          <serviceBehaviors>
            <behavior name="">
                <serviceMetadata httpGetEnabled="true" httpsGetEnabled="true" />
                <serviceDebug includeExceptionDetailInFaults="false" />
            </behavior>
        </serviceBehaviors>
    </behaviors>
    <services>
        <service name="Portal.Services.ServiceContract.PortalContract">
            <endpoint 
                address="" 
                binding="basicHttpBinding" 
                contract="Portal.Services.ServiceContract.IPortalContract">
                <identity>
                    <dns value="localhost" />
                </identity>
            </endpoint>
            <endpoint 
                address="mex" 
                binding="mexHttpBinding" 
                contract="IMetadataExchange" />
            <host>
                <baseAddresses>
                    <add baseAddress="http://localhost:8000/Portal" />
                </baseAddresses>
            </host>
        </service>
    </services>
</system.serviceModel>

服务代码：

 namespace Portal.Services.ServiceContract
    {
        // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IPortalContract" in both code and config file together.
        [ServiceContract(Namespace = "")]
        public interface IPortalContract
        {
            [WebInvoke(ResponseFormat = WebMessageFormat.Json, Method = "GET", BodyStyle = WebMessageBodyStyle.Wrapped)]
            double Ping();

            [OperationContract]
            object CashInResult(string key);
        }
    }

namespace Portal.Services.ServiceContract
{
    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
    public class PortalContract : IPortalContract
    {
        public double Ping()
        {
            return -1;
        }

        [WebGet]
        [WebInvoke(ResponseFormat = WebMessageFormat.Json, Method = "GET", BodyStyle = WebMessageBodyStyle.Wrapped)]
        public object CashInResult(string key)
        {
            return new {Value = "Some Data"};
        }
    }
}

我只想简单访问url并获取json结果
http://localhost:8000/Portal/CashInResult?key=secretkey

现在我收到错误[Failed to load resource: the server responded with a status of 400 (Bad Request)]

从Web应用程序我得到错误

 XMLHttpRequest cannot load /Portal/CashInResult?key=1. Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin '???' is therefore not allowed access. The response had HTTP status code 400.

Answer 1

要让您的GET请求正常工作，您可以在浏览器中自己将标题（Access-Control-Allow-Origin）添加到请求中，但只有GET请求才有效。

如果您在Windows服务中运行WCF，则不使用system.webServer，因为没有IIS。

此链接显示如何在IIS之外的WCF中实现完全CORS。

https://code.msdn.microsoft.com/windowsdesktop/Implementing-CORS-support-c1f9cd4b

但在SO帖子中解释有点长，但这就是为什么它现在不适合你......

CORS世界中有两种类型的请求，“正常”请求和“预检”请求。

正常或安全（HTTP GET）请求涉及浏览器向请求发送ORIGIN标头，服务器根据该标头接受/拒绝。

预检或不安全（例如POST，PUT或DELETE）请求涉及浏览器发送HTTP OPTIONS请求，要求获得将实际请求发送到服务器的权限。

当您在system.webServer部分中启用设置时，IIS将为您提供所有这些功能。托管WCF作为Windows服务需要IIS出局，所以在WCF中你需要自己实现CORS。

我认为您应该重新考虑并使用IIS，如果服务的目的是为HTTP请求提供服务。

Answer 2

经过多次尝试，我找到了解决方案。

     namespace Portal.Services.ServiceContract
{
    // NOTE: You can use the "Rename" command on the "Refactor" menu to change the interface name "IPortalContract" in both code and config file together.
    [ServiceContract(Namespace = "")]
    public interface IPortalContract
    {
        [WebInvoke(ResponseFormat = WebMessageFormat.Json, Method = "GET", BodyStyle = WebMessageBodyStyle.Wrapped)]
        double Ping();

        [OperationContract]
        string CashInResult(string key);
    }
}

namespace Portal.Services.ServiceContract
        {
            [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
            public class PortalContract : IPortalContract
            {
                readonly Logger _nLog = LogManager.GetCurrentClassLogger();
                public double Ping()
                {
                    using (var tMeter = new TimeMeterLog(_nLog, "Ping"))
                    {
                        tMeter.Info("-1");
                        return -1;
                    }
                }

                [WebGet(UriTemplate = "/CashInResult/{key}", ResponseFormat = WebMessageFormat.Json)]
                public string CashInResult(string key)
                {
                    using (var tMeter = new TimeMeterLog(_nLog, "CashInResult"))
                    {
                        var result = JsonConvert.SerializeObject(new { Value = "Some Data" });
                        tMeter.Info(result);
                        return result;
                    }
                }
            }
        }

从浏览器调用服务：

http://localhost:8000/rest/Ping

结果：{"PingResult":-1}

有源代码。 https://github.com/djromix/Portal.WorckFlow

访问Windows服务中托管的WCF

2 个答案: