C#中的WCF多线程调用答案

【问题标题】：WCF multithread call in c#C#中的WCF多线程调用
【发布时间】：2018-10-18 08:19:45
【问题描述】：

我正在尝试调用WCF 服务，您可以在此处看到：

  [ServiceBehavior(UseSynchronizationContext = false,ConcurrencyMode =ConcurrencyMode.Multiple)]

    public class InquiryService : IInquiryService
    {
        private DataContext _ctx;
        private IUserService _userService;
        public InquiryService(DataContext ctx, INajaService najaService, IUserService userService)
        {
            _ctx = ctx;

            _userService = userService;
        }

        public Inquiryview Inquiry(string VisitDatetime, string Plaque)
        {

My service !!!!!
       }

}

WCFwebconfig:

 <serviceThrottling maxConcurrentCalls="1000" maxConcurrentSessions="1000" maxConcurrentInstances="1000" />

这是我调用服务的多线程程序：

private async void btnStart_Click(object sender, RoutedEventArgs e)
{
    btnStart.Content = "Please Wait...";
    btnStart.IsEnabled = false;

    await Task.Run(() =>
    {
        InquiryService service = new InquiryService();
        FinalList = new List<FinalData>();
        var items = Data.GetData(from, to).AsEnumerable();

        start = DateTime.Now;
        Parallel.ForEach(items, new ParallelOptions { MaxDegreeOfParallelism = threadCount }, item =>
         {
             string plaque = Plaque.GeneratePlaque(item.palll);

             var result = service.Inquiry(plaque);
             string serializedResult = new JavaScriptSerializer().Serialize(result);

             FinalData finalData = new FinalData()
             {
                 date = result.StartDate,
                 enddate = result.EndDate,
                 log = serializedResult,
                 plaque = plaque
             };

             lock (FinalList)
             {
                 FinalList.Add(finalData);

                 lock (lblCount)
                 {
                     Dispatcher.Invoke(() =>
                     {
                         lblCount.Content = FinalList.Count;
                     });
                 }
             }

             plaque = null;
         });

        end = DateTime.Now;
        duration = end - start;

        Dispatcher.Invoke(() =>
        {
            btnStart.Content = "Insert Data...";
        });

        Data.InsertData(FinalList);
    });

    btnStart.Content = "Start";
    btnStart.IsEnabled = true;

    MessageBox.Show("Service Response Time = " + duration.ToString());
}

调用服务的类：

私有 MemoryStream 毫秒；私有静态只读字符串 ServiceHostName = "https://****.muservice.ir/InquiryService.svc";

public InquiryService()
{
    ms = new MemoryStream();
}

public Result Inquiry(string Plaque)
{
    string result_ = "";
    ServicePointManager.ServerCertificateValidationCallback += (se, cert, chain, sslerror) => { return true; };
    DateTime start;
    DateTime end;
    using (var ClientRequest = new WebClient())
    {
        ClientRequest.Headers["Content-type"] = "application/json";
        ClientRequest.Encoding = Encoding.UTF8;
        NetworkCredential credential1 = new NetworkCredential("1", "1");
        ClientRequest.Credentials = credential1;
        start = DateTime.Now;
        result_ = ClientRequest.
            (ServiceHostName + "/Inquiry/2012-12-28" + "/" + Plaque);
        end = DateTime.Now;
    }

    var javascriptserializer = new JavaScriptSerializer();
    Result temp = javascriptserializer.Deserialize<Result>(result_);
    temp.StartDate = start;
    temp.EndDate = end;

    return temp;
}

运行程序后正确调用服务（大约 100 毫秒），但在大约 1000 次请求后，我的请求时间增长到（8 秒）。我想知道我应该改变什么吗？

【问题讨论】：

可能之前的 1000 个请求仍在处理中，所以下一个需要等待，直到前一千个请求中的至少一个完成。
您是否在 IIS 上托管？使用 Profiler 看看发生了什么，可能在 1000 个请求之后积累了大量未完成的请求，管道不太可能真正能够在没有任何序列化/排队的情况下并行执行 1000 个。
@dlatikay 是的，我正在使用 IIS
@dlatikay 那么我应该更改任何配置设置吗？在 wcf 中
@danish 那我该怎么办？

标签： c# multithreading wcf parallel-processing

【解决方案1】：

试试这个服务行为

 [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerCall,
                        ConcurrencyMode = ConcurrencyMode.Multiple)]

建议使用 PerCall 实例以实现可扩展性。

【讨论】：

【解决方案2】：

最后将此代码添加到客户端的配置文件中。因为windows有出站流量限制

<configuration>  
  <system.net>  
    <connectionManagement>  
      <add address="*" maxconnection="65456”/>  
    </connectionManagement>  
  </system.net>  
</configuration>

【讨论】：