using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceModel;
namespace Calculator.Service
{
  [ServiceContract]
  public interface ICalculator
  {
    [OperationContract]
    double Add(double x, double y);
    [OperationContract]
    double Subtract(double x, double y);
    [OperationContract]
    double Multiply(double x, double y);
    [OperationContract]
    double Divide(double x, double y);
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace Calculator.Service
{
  public class CalculatorService:ICalculator
  {
    public double Add(double x, double y)
    {
      return x + y;
    }
    public double Subtract(double x, double y)
    {
      return x - y;
    }
    public double Multiply(double x, double y)
    {
      return x * y;
    }
    public double Divide(double x, double y)
    {
      return x / y;
    }
  }
}

using Calculator.Service;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.Text;
using System.Windows.Forms;
namespace Calculator.Host
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    ServiceHost host = null;
    private void btnOpen_Click(object sender, EventArgs e)
    {
      host = new ServiceHost(typeof(CalculatorService));
      host.AddServiceEndpoint(typeof(ICalculator), new WSHttpBinding(), "http://localhost:8008/Calculator");
      if (host.Description.Behaviors.Find<ServiceMetadataBehavior>()==null)
      {
        ServiceMetadataBehavior behavior = new ServiceMetadataBehavior();
        behavior.HttpGetEnabled = true;
        behavior.HttpGetUrl = new Uri("http://localhost:8008/Calculator/metadata");
        host.Description.Behaviors.Add(behavior);
      }
      host.Opened += delegate { label1.Text = "服務(wù)已經(jīng)啟動(dòng)！"; };
      host.Open();
    }
    private void btnClose_Click(object sender, EventArgs e)
    {
      if (host.State != CommunicationState.Closed)
      {
        host.Closed += delegate { label1.Text = "服務(wù)已經(jīng)停止！"; };
        host.Close();
      }
    }
  }
}

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;
namespace Calculator.Client
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }
    private void Form1_Load(object sender, EventArgs e)
    {
      comboBox1.Text = "+";
    }
    private void button1_Click(object sender, EventArgs e)
    {
      CalculatorService.CalculatorClient client = new CalculatorService.CalculatorClient();
      double x = Convert.ToDouble (textBox1.Text);
      double y = Convert.ToDouble(textBox2.Text);
      double result=0;
      string operater = comboBox1.Text;
      switch (operater )
      {
        case "+":
          result = client.Add(x, y);
          break;
        case "-":
          result = client.Subtract(x, y);
          break;
        case "*":
          result = client.Multiply(x, y);
          break;
        case "/":
          if (y==0)
          {
            MessageBox.Show("除數(shù)不能為0！");
            return;
          }
          result = client.Divide(x, y);
          break;
      }
      label1.Text = textBox1.Text + comboBox1.Text + textBox2.Text + " = " + Convert.ToString(result);
    }
  }
}