c#基礎，單執行緒，跨執行緒訪問和執行緒帶引數

若青若墨發表於2018-05-02
C#執行緒
  1 using System;
  2 using System.Collections.Generic;
  3 using System.Threading;
  4 using System.Windows.Forms;
  5 
  6 namespace 執行緒和跨執行緒
  7 {
  8     public partial class Form1 : Form
  9     {
 10         public Form1()
 11         {
 12             InitializeComponent();
 13         }
 14         /// <summary>
 15         /// 單執行緒直接假死了
 16         /// </summary>
 17         /// <param name="sender"></param>
 18         /// <param name="e"></param>
 19         private void btnAlone_Click(object sender, EventArgs e)
 20         {
 21             for (int i = 0; i < 100000; i++)
 22             {
 23                 //通過[除錯]-[視窗]-[輸出]顯示列印值
 24                 Console.WriteLine(i);
 25             }
 26         }
 27 
 28 
 29         /// <summary>
 30         /// 新執行緒執行，窗體不假死
 31         /// </summary>
 32         /// <param name="sender"></param>
 33         /// <param name="e"></param>
 34         private void btnNew_Click(object sender, EventArgs e)
 35         {
 36             Thread th = new Thread(ShowCalculator)
 37             {
 38                 IsBackground = true
 39             };
 40             th.Start();
 41 
 42         }
 43         /// <summary>
 44         /// 迴圈計算方法，供新執行緒使用
 45         /// </summary>
 46         private void ShowCalculator()
 47         {
 48             for (int i = 0; i < 100000; i++)
 49             {//通過[除錯]-[視窗]-[輸出]顯示列印值
 50                 Console.WriteLine(i);
 51             }
 52         }
 53         /// <summary>
 54         /// 帶引數的
 55         /// </summary>
 56         /// <param name="sender"></param>
 57         /// <param name="e"></param>
 58         private void btnParameters_Click(object sender, EventArgs e)
 59         {
 60             List<int> list = new List<int>() { 1, 2, 3, 4, 5 };
 61             ParameterizedThreadStart parThreadStart = new ParameterizedThreadStart(ShowParameters);
 62             Thread th = new Thread(parThreadStart) { IsBackground = true };
 63             th.Start(list);
 64         }
 65         private void ShowParameters(object obj)
 66         {
 67             //執行緒中的引數只能是Object
 68             List<int> result = obj as List<int>;
 69             foreach (var item in result)
 70             {
 71                 MessageBox.Show(item.ToString());
 72             }
 73         }
 74         /// <summary>
 75         /// 跨執行緒訪問
 76         /// </summary>
 77         /// <param name="sender"></param>
 78         /// <param name="e"></param>
 79         private void button1_Click(object sender, EventArgs e)
 80         {
 81             Thread th = new Thread(ShowMulti) { IsBackground = true };
 82             th.Start();
 83         }
 84         /// <summary>
 85         /// 解決跨執行緒訪問報異常,不使用關閉跨執行緒檢查
 86         /// </summary>
 87         private void ShowMulti()
 88         {
 89             int first = 0;
 90             for (int i = 0; i < 10; i++)
 91             {
 92                 first = i;
 93             }
 94             //是否要對lbl控制元件進行跨執行緒
 95             if (this.lblShow.InvokeRequired)
 96             {
 97                 //對委託中的資料型別驗證
 98                 this.lblShow.Invoke(new Action<Label, string>(ShowLableValue), this.lblShow, first.ToString());
 99             }
100             else
101             {
102                 this.lblShow.Text = first.ToString();
103             }
104         }
105         /// <summary>
106         /// 把值寫到控制元件中
107         /// </summary>
108         /// <param name="lbl"></param>
109         /// <param name="value"></param>
110         private void ShowLableValue(Label lbl, string value)
111         {
112             lbl.Text = value;
113         }
114 
115         private void Form1_Load(object sender, EventArgs e)
116         {
117             //關閉跨程式檢查
118             //Label.CheckForIllegalCrossThreadCalls = false;
119             //改用委託方法實現
120         }
121     }
122 }

 

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