Question

很抱歉再次发布同样的问题，但种类没有第一次正确。：）

这是服务器应用程序的代码，它可以接收连接并应该向客户端发送消息。

正如您所看到的，我有GUI的“类Form1：Form ”和服务器功能的“类ServerWCallbackImpl：IServerWithCallback ”。

问题是这些类无法通信，即我不能从表单事件中引入服务器函数，例如buttonClick，也不能在表单中更改某些内容，比如TextBox1.Text + = .. 。，来自服务器功能。

也许有人可以解释一下，代码应该怎么样，以便它可以工作？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.ServiceModel;

namespace server
{


[ServiceContract(Namespace = "server", CallbackContract = typeof(IDataOutputCallback), SessionMode = SessionMode.Required)]


public interface IServerWithCallback           ///// what comes from the client to the server.
{
    [OperationContract(IsOneWay = true)]
    void StartConnection(string clientName);

    [OperationContract(IsOneWay = true)]
    void Message_Cleint2Server(string msg);
}


public interface IDataOutputCallback          ///// what goes from the sertver, to the client.
{
    [OperationContract(IsOneWay = true)]
    void AcceptConnection();

    [OperationContract(IsOneWay = true)]
    void Message_Server2Client(string msg);
}


    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }


        private void Form1_Load(object sender, EventArgs e)     /// once the form loads, create and open a new ServiceEndpoint.
        {
              ServiceHost duplex = new ServiceHost(typeof(ServerWCallbackImpl));
              duplex.AddServiceEndpoint(typeof(IServerWithCallback), new NetTcpBinding(), "net.tcp://localhost:9080/service");
              duplex.Open();
              this.Text = "SERVER *on-line*";
        }

        private void buttonSendMsg_Click(object sender, EventArgs e)
        {
            /// callback.Message_Server2Client(textBox2.Text);
            /// The name 'Message_Server2Client' does not exist in the current context :(
        }

    }



        class ServerWCallbackImpl : IServerWithCallback /// NEED TO SOMEHOW MERGE THIS ONE WITH THE FORM1 CLASS
        {


            IDataOutputCallback callback = OperationContext.Current.GetCallbackChannel<IDataOutputCallback>();


            public void StartConnection(string name)
            {
                /// TextBox1.text += name + " has connected!";
                /// 'TextBox1' does not exist in the current context :(
                /// can't reach form1 components. :/
                MessageBox.Show( name + " has connected!");
                Message2Client("Welcome, "+name+"!");
            }


            public void Message_Cleint2Server(string msg)
            {
                /// TextBox1.text += msg;
                /// 'TextBox1' does not exist in the current context :(
                /// can't reach form1 components. :/
            }


            public void Message2Client(string msg)
            {
                callback.Message_Server2Client(msg);
            }


        }

}

Answer 1

双工变量的生命周期仅限于Form1_Load方法。这意味着您的主机将在方法完成后终止。要保持主机运行，请在方法外声明双工变量，并在方法中实例化它。

像这样：

public partial class Form1 : Form {
    //Declare the variable in the class, not the method body
    private ServiceHost duplex;

    public Form1() {
        InitializeComponent();
    }

    // once the form loads open a new ServiceEndpoint. 
    private void Form1_Load(object sender, EventArgs e) {
          duplex = new ServiceHost(typeof(ServerWCallbackImpl));
          duplex.AddServiceEndpoint(typeof(IServerWithCallback), new NetTcpBinding(), "net.tcp://localhost:9080/service");
          duplex.Open();
          this.Text = "SERVER *on-line*";
    }

    private void buttonSendMsg_Click(object sender, EventArgs e) {
        /// callback.Message_Server2Client(textBox2.Text);
        /// The name 'Message_Server2Client' does not exist in the current context :(
    }

}

EDIT1：

如果使用类似示例的类型实例化ServiceHost，则将为每个连接创建该类型的实例。您可以将实例的生命周期设置为我认为的会话，呼叫或连接。我不确定该对象如何访问您的表单。但是，如果您自己实例化ServerWCallbackImpl类并将引用传递给将要使用该实例的主机。

public partial class Form1 : Form {
    //Declare the variable in the class, not the method body
    private ServiceHost duplex;
    private ServerWithCallbackImpl localInstance;

    public Form1() {
        InitializeComponent();
    }

   private void Form1_Load(object sender, EventArgs e) {
      localInstance = new ServerWithCallbackImpl();
      NetTcpBinding binding = new NetTcpBinding ();
      duplex = new ServiceHost(localInstance, new Uri[] { new Uri("net.tcp://localhost:9080") });
      duplex .AddServiceEndpoint(typeof(IServerWithCallback), binding, "service");
      duplex .Open();
      this.Text = "SERVER *on-line*";
   }
 }

然后，ServerWithCallbackImpl对象必须跟踪它的客户端。要让服务器更新GUI，您可能希望将对Form作为参数的引用传递给ServerWithCallbackImpl构造函数。请查看the Publish/Subscriber pattern以更深入地了解回调。

在C＃/ WCF中创建一个类的实例？

1 个答案: