Question

我是WCF的新手，我已经为我的项目添加了一个示例WCF服务，但是当我尝试通过浏览器访问webservice方法时，它显示了空白窗口。我搜索谷歌的解决方案，但解决一个问题出现另一个问题我想知道如何在我的浏览器窗口中以json格式获取服务返回的值。

我的代码是这样的：

[ServiceContract]

public interface IService
{   

    [OperationContract]
    [WebGet(UriTemplate = "DoWork", ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare)]
        int DoWork();
}

类是这样的：

public class Service : IService
{
    private int counter=0;
    public int DoWork()
    {
        counter++;
        return counter;
    }
}

Web.config是这样的：

<?xml version="1.0"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
    <connectionStrings>
        <add name="ApplicationServices" connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true" providerName="System.Data.SqlClient"/>
    </connectionStrings>
    <system.web>
        <compilation debug="true" targetFramework="4.0"/>
        <authentication mode="Forms">
            <forms loginUrl="~/Account/Login.aspx" timeout="2880"/>
        </authentication>
        <membership>
            <providers>
                <clear/>
                <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10" applicationName="/"/>
            </providers>
        </membership>
        <profile>
            <providers>
                <clear/>
                <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>
            </providers>
        </profile>
        <roleManager enabled="false">
            <providers>
                <clear/>
                <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/"/>
                <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/"/>
            </providers>
        </roleManager>
    </system.web>
    <system.webServer>
        <modules runAllManagedModulesForAllRequests="true"/>
    </system.webServer>
    <system.serviceModel>

    <services >
      <service name="Service">
        <endpoint address ="http://localhost:1726/WcfSessionMgt/Service.svc" contract ="IService" binding ="basicHttpBinding"  listenUri="/" ></endpoint>
        <endpoint address="mex" contract="IMetadataExchange" binding="mexHttpBinding"/>
      </service>

    </services>


    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="false" />
    </system.serviceModel>
</configuration>

Answer 1

尝试通过添加Json行为配置来指定您正在使用Json进行操作。如果您没有指定您期望Json响应/请求，则默认为XML，这可能是您所看到的问题。

示例web.config如下：

  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="JsonBehavior">
          <webHttp defaultOutgoingResponseFormat="Json"/>
        </behavior>
      </endpointBehaviors>  
    </behaviors>
    <services>
      <service name="Service.Service">
        <endpoint address="http://localhost/Service/Service.svc"
                  listenUri="/" binding="webHttpBinding"
                  contract="Service.Service" 
                  behaviorConfiguration="JsonBehavior"/>
      </service>
    </services>
  </system.serviceModel>

如果这不起作用，请尝试将以下内容添加到web.config中。它将输出一个详细的日志，可能允许您进一步调试问题：

  <system.diagnostics>
    <sources>
      <source name="System.ServiceModel"
              switchValue="Information, ActivityTracing"
              propagateActivity="true">
        <listeners>
          <add name="traceListener"
              type="System.Diagnostics.XmlWriterTraceListener"
              initializeData= "c:\log\Traces.svclog" />
        </listeners>
      </source>
    </sources>
  </system.diagnostics>

如果您从此转储中发布错误的详细日志，则可能会得到更好的响应。

修改：已移除 httpsGetEnabled =“true”

Answer 2

通过将我的web.config更改为此来解决。

<?xml version="1.0"?>
<configuration>
    <system.web>
        <compilation debug="true" targetFramework="4.0"/>
    </system.web>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
  <system.serviceModel>

    <serviceHostingEnvironment>
      <baseAddressPrefixFilters>
          <add prefix="http://localhost:1726/WcfSessionMgt/"/>
      </baseAddressPrefixFilters>
    </serviceHostingEnvironment>
    <behaviors>
      <serviceBehaviors>
        <behavior name="ServiceBehavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="JsonBehavior">
          <webHttp/>
        </behavior>
      </endpointBehaviors>
    </behaviors>
    <services>
      <service behaviorConfiguration="ServiceBehavior" name="Service">
         <endpoint address="http://localhost:1726/WcfSessionMgt/Service.svc" binding="webHttpBinding" contract="IService" behaviorConfiguration="JsonBehavior">
          <identity>
            <dns value="http://localhost:1726"/>
          </identity>
        </endpoint>
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
  </system.serviceModel>
  <system.diagnostics>
    <sources>
      <source name="System.ServiceModel"
              switchValue="Information, ActivityTracing"
              propagateActivity="true">
        <listeners>
          <add name="traceListener"
              type="System.Diagnostics.XmlWriterTraceListener"
              initializeData= "c:\log\Traces.svclog" />
        </listeners>
      </source>
    </sources>
  </system.diagnostics>
</configuration>

WCF服务在浏览器中显示空白

2 个答案: