WCF体验之旅(6)：在Winform Application中调用Duplex Service出现Timeout Exception的原因和解决方案(1)

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using Artech.DuplexWCFService.Contract;
using System.ServiceModel;
namespace Artech. WCFService.Client
{
[ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]
public class CalculatorCallbackHandler : ICalculatorCallback
{
ICalculatorCallback Members#region ICalculatorCallback Members
public void ShowResult(double x, double y, double result)
{
MessageBox.Show(string.Format("x + y = {2} 
where x = {0} and {1}", x, y, result),"
Result", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
#endregion
}
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace Artech. WCFService.Client
{
public partial class Form1 : Form
{
private DuplexCalculatorClient _calculator;
private double _op1;
private double _op2;
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
this._calculator = new DuplexCalculatorClient(
new System.ServiceModel.InstanceContext(new CalculatorCallbackHandler()));
}
private void Calculate()
{
this._calculator.Add(this._op1, this._op2);
}
private void buttonCalculate_Click(object sender, EventArgs e)
{
if (!double.TryParse(this.textBoxOp1.Text.Trim(), out this._op1))
{
MessageBox.Show("Please enter a valid number","Error", 
MessageBoxButtons.OK,MessageBoxIcon.Error);
this.textBoxOp1.Focus();
}
if (!double.TryParse(this.textBoxOp2.Text.Trim(), out this._op2))
{
MessageBox.Show("Please enter a valid number","Error", 
MessageBoxButtons.OK,MessageBoxIcon.Error);
this.textBoxOp1.Focus();
}
try
{
this.Calculate();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, 
MessageBoxIcon.Error);
} 
}
}
}