C#跨线程修改控件——从MSIL和汇编看Invoke, 多线程, 事件与事件委托

线程间操作无效: 从不是创建控件"progressBar1"的线程访问它。

 1 #region Auto-Generated Properties
 2 
 3 // DelegateDemo - Director.cs
 4 // by Wings
 5 // Last Modified : 2013-05-28 11:43
 6 
 7 #endregion
 8 
 9 #region Using Block
10 
11 using System.Globalization;
12 using System.Threading;
13 
14 #endregion
15 
16 namespace DelegateDemo
17 {
18     public delegate void PostEventHandler(string postStatus);
19 
20     internal class Director
21     {
22         private static PostEventHandler _report;
23 
24         public event PostEventHandler OnReport
25         {
26             add { _report += value; }
27             remove { _report -= value; }
28         }
29 
30         public static void Test()
31         {
32             int counter = 0;
33             while (counter++ < 100)
34             {
35                 _report(counter.ToString(CultureInfo.InvariantCulture));
36                 Thread.Sleep(100);
37             }
38         }
39     }
40 }

 1 #region Auto-Generated Properties
 2   
 3   // DelegateDemo - Form1.cs
 4   // by Wings
 5   // Last Modified : 2013-05-27 19:54
 6   
 7   #endregion
 8   
 9   #region Using Block
10   
11   using System;
12   using System.Threading;
13   using System.Windows.Forms;
14   
15   #endregion
16   
17   namespace DelegateDemo
18   {
19       public partial class Form1 : Form
20       {
21           public Form1()
22           {
23               InitializeComponent();
24           }
25   
26           private void button1_Click(object sender, EventArgs e)
27           {
28               Director director = new Director();
29               director.OnReport += director_OnReport;
30               Thread thread = new Thread(Director.Test)
31                               {
32                                   Name = "thdDirector"
33                               };
34               thread.Start();
35           }
36   
37           private void director_OnReport(string postStatus)
38           {
39               int value = Convert.ToInt32(postStatus);
40               this.progressBar1.Value = value;  //此处产生异常
41           }
42       }
43   }

 1 #region Auto-Generated Properties
 2  
 3  // DelegateDemo - Form1.cs
 4  // by Wings
 5  // Last Modified : 2013-05-28 13:06
 6  
 7  #endregion
 8  
 9  #region Using Block
10  
11  using System;
12  using System.Threading;
13  using System.Windows.Forms;
14  
15  #endregion
16  
17  namespace DelegateDemo
18  {
19      public partial class Form1 : Form
20      {
21          public Form1()
22          {
23              InitializeComponent();
24          }
25  
26          private void button1_Click(object sender, EventArgs e)
27          {
28              Director director = new Director();
29              director.OnReport += director_OnReport;
30              Thread thread = new Thread(Director.Test)
31                              {
32                                  Name = "thdDirector"
33                              };
34              thread.Start();
35          }
36  
37          private void director_OnReport(string postStatus)
38          {
39              int value = Convert.ToInt32(postStatus);
40              if (this.progressBar1.InvokeRequired)
41              {
42                  SetValueCallback setValueCallback = delegate(int i)
43                                                      {
44                                                          this.progressBar1.Value = i;
45                                                      };
46                  this.progressBar1.BeginInvoke(setValueCallback, value);
47              }
48              else
49              {
50                  this.progressBar1.Value = value;
51              }
52          }
53  
54          private delegate void SetValueCallback(int value);
55      }
56  }