Question

我在我的代码中使用了WCF服务，客户端（WindowsFormsApplication1）捕获桌面视图并将其发送到服务器。之后，服务器将图像发送到Masterclient（windowsformsApplication2）。它工作......但是几分钟我从clientSide获得异常，因为对象引用不是设置对象的实例我如何解决这个问题....

这是我的代码：

public void SendToServerToMainServer(clsImageObject img)
{

        ConnectToServerSettings();
        InterfaceClass.IService serviceobj = Client.CreateChannel();// I   got  exception in This line,And the serviceobj got null Suddenly...
        serviceobj.SendToServerToMasterClient(img, clpro.MyIPAddress);
        Client.Close();
        Client = null;
    }
    }




public void ConnectToServerSettings()
{

        string StrAddress = File.ReadAllText(AppDomain.CurrentDomain.BaseDirectory + "url1.txt");
        //EndpointAddress ea = new EndpointAddress(@"net.tcp://10.0.3.33:2222/ClsPCMain");
        EndpointAddress ea = new EndpointAddress(StrAddress);
        NetTcpBinding binding = new NetTcpBinding(SecurityMode.None, false);
        //binding.TransferMode = TransferMode.Streamed;
        binding.MaxBufferPoolSize = Int32.MaxValue;
        binding.MaxReceivedMessageSize = Int32.MaxValue;
        binding.PortSharingEnabled = true;
        binding.ReceiveTimeout = TimeSpan.MaxValue;
        binding.SendTimeout = TimeSpan.MaxValue;
        binding.OpenTimeout = TimeSpan.MaxValue;
        binding.CloseTimeout = TimeSpan.MaxValue;
        binding.MaxReceivedMessageSize = Int32.MaxValue;
        binding.MaxBufferPoolSize = Int32.MaxValue;
        binding.MaxConnections = Int16.MaxValue;
        binding.ReaderQuotas.MaxArrayLength = Int32.MaxValue;
        binding.ReaderQuotas.MaxBytesPerRead = Int32.MaxValue;
        binding.ReaderQuotas.MaxDepth = Int32.MaxValue;
        binding.ReaderQuotas.MaxNameTableCharCount = Int32.MaxValue;
        binding.ReaderQuotas.MaxStringContentLength = Int32.MaxValue;
        binding.Security.Mode = SecurityMode.None;
        Client = new ChannelFactory<InterfaceClass.IService>(binding, ea);

    }

}

Answer 1

尝试在使用后关闭频道

using (InterfaceClass.IService serviceobj = Client.CreateChannel())
{
    serviceobj.SendToServerToMasterClient(img, clpro.MyIPAddress);
    serviceobj.Close();
    Client.Close();
    Client = null;
}

tbh，我不确定这段代码是否干净。您似乎使用了一个类（实例？）变量'Client'，您填写1方法，并在其他方法中关闭＆amp;清除。如果没有太多代码重写，我会修改'ConnectToServerSettings（）'的签名以返回Client实例，而不是将其推送到变量中。

希望这有帮助，

Answer 2

您应该非常小心地关闭通道，并在整个应用程序中放置对象空值检查，以避免对象引用为空的异常。

WCF客户端中的异常

2 个答案: