Question

我创建了一个WCF休息服务，然后使用ajax从javascript调用它。现在我想要异步执行此服务，但它也应该可以访问会话变量。

 [ServiceContract]
public interface IService
{
    [OperationContract]
    [WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Json, UriTemplate = "/DoWork")]
    void DoWork();

}

    [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]
public class Service : IService
{
    public void DoWork()
    {

        System.Threading.Thread.Sleep(15000); // Making some DB calls which take long time.
        try
        {

            HttpContext.Current.Session["IsCompleted"] = "True"; // Want to set a value in session to know if the async operation is completed or not.
        }
        catch
        {
        }
    }
}

Web.Config =

   <system.serviceModel>
    <serviceHostingEnvironment aspNetCompatibilityEnabled="true" multipleSiteBindingsEnabled="true" />
    <bindings>
      <webHttpBinding>
        <binding name="Rest_WebBinding">
          <security mode="Transport">
          </security>
        </binding>
      </webHttpBinding>
    </bindings>
    <behaviors>
      <endpointBehaviors>
        <behavior name="Rest">
          <webHttp />
        </behavior>
      </endpointBehaviors>
      <serviceBehaviors>
        <behavior name="AsyncHost.Services.ServiceBehavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service behaviorConfiguration="AsyncHost.Services.ServiceBehavior" name="AsyncHost.Services.Service">

        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
        <endpoint behaviorConfiguration="Rest" binding="webHttpBinding" contract="AsyncHost.Services.IService" />
      </service>
    </services>
  </system.serviceModel>
  <system.web>

我从javascript中使用此服务，如下所示，

$.ajax({
                type: "POST",
                async: true,
                contentType: "application/json",
                url: 'http://localhost:34468/Services/Service.svc/DoWork',
                data: null,
                cache: false,
                processData: false,
                error: function () {
                    alert('Error');
                }
            });

    setTimeout("window.location.href = 'SecondPage.aspx';", 200);

这里我并不担心这个服务的响应，但它应该在完成之后更新会话变量，因为我已经在服务实现中进行了评论。

调用此服务后，我希望将其重定向到secondpage.aspx，异步服务调用应继续在后台执行。但在上述情况下，它等待服务的完全执行（即同步执行），然后重定向到secondpage.aspx。如果有任何其他方法可以实现这一点，请告诉我。

Answer 1

您可以从服务中返回一个布尔值。在返回布尔响应之前，只需启动一个新线程并执行后台作业。

通过会话变量访问异步调用WCF休息服务

1 个答案: