C# 使用jQuery使用WCF服务

我一直在努力尝试从WCF服务获取数据，但运气不佳，我会感谢您的帮助，这是我的代码，我在ajax调用的错误函数中总是得到“0 undefined”：

Service1.svc.cs

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class Service1 : IService1
{
    public string GetData()
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        string output = "It worked";

        return serializer.Serialize(output); 
    }
}

    [OperationContract]
    [System.ServiceModel.Web.WebInvoke(Method = "POST",
        ResponseFormat = System.ServiceModel.Web.WebMessageFormat.Json)]
    string GetData();

IService1.cs

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class Service1 : IService1
{
    public string GetData()
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        string output = "It worked";

        return serializer.Serialize(output); 
    }
}

    [OperationContract]
    [System.ServiceModel.Web.WebInvoke(Method = "POST",
        ResponseFormat = System.ServiceModel.Web.WebMessageFormat.Json)]
    string GetData();

Web.config

<?xml version="1.0"?>
<configuration>

  <appSettings>
    <add key="aspnet:UseTaskFriendlySynchronizationContext" value="true" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5"/>
  </system.web>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="ServiceBehavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
          </behavior>
        </serviceBehaviors>
      <endpointBehaviors>
        <behavior name="ServiceAspNetAjaxBehavior">
          <enableWebScript />
          </behavior>
        </endpointBehaviors>
    </behaviors>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true"/>
    <services>
      <service behaviorConfiguration="ServiceBehavior" name="MyService.Service1">
        <endpoint address="" binding="webHttpBinding" contract="MyService.IService1" behaviorConfiguration="ServiceAspNetAjaxBehavior">
          <identity>
            <dns value="localhost"/>
          </identity>
          </endpoint>
          <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
          </service>
        </services>
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
    <!--
        To browse web app root directory during debugging, set the value below to true.
        Set to false before deployment to avoid disclosing web app folder information.
      -->
    <directoryBrowse enabled="true"/>
  </system.webServer>

</configuration>

---

localhost是您的WCF服务所在的位置，在这之后，它就可以工作了！非常感谢你们两位告诉我Javascript的调试器，这给了我线索

更新：

我刚刚找到了解决方案，结果我需要在WCF服务解决方案中创建一个Global.asax文件，代码如下：

    protected void Application_BeginRequest(object sender, EventArgs e)
    {
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "http://localhost");
        if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
        {
            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "POST, PUT, DELETE");

            HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
            HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
            HttpContext.Current.Response.End();
        }
    }

protected void Application_BeginRequest(object sender, EventArgs e)
{
    HttpContext.Current.Response.AddHeader("Access-Control-Allow-Origin", "http://localhost");
    if (HttpContext.Current.Request.HttpMethod == "OPTIONS")
    {
        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Methods", "POST, PUT, DELETE");

        HttpContext.Current.Response.AddHeader("Access-Control-Allow-Headers", "Content-Type, Accept");
        HttpContext.Current.Response.AddHeader("Access-Control-Max-Age", "1728000");
        HttpContext.Current.Response.End();
    }
}

---

localhost是您的WCF服务所在的位置，在这之后，它就可以工作了！非常感谢你们两位告诉我Javascript的调试器，这给了我线索

result.GetDataResult将向您提供该错误。您可以从Google Chrome调试javascript，并查看结果返回的值。我刚刚将其更改为：success:function（result）{alert（result.d）；}，结果相同。如何从Google chrome调试javascript代码？不要在jQuery脚本中使用

alert（resultObject）

，而是使用

console.log（result）

。然后，您可以在浏览器的开发控制台（通常使用

F12

键打开）中查看结果。在打开的面板中查找名为Console的选项卡。我得到：请求的资源上没有“Access Control Allow Origin”头。因此，不允许访问源“null”。回复的HTTP状态代码为405。与论坛网站不同，我们不使用“感谢”或“感谢任何帮助”或签名。顺便说一句，这是“提前感谢”，而不是“提前感谢”。