form1.cs

WindowsForms实现安全的多线程详解示例

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Text;
using System.Threading;
using System.Diagnostics;

namespace DelegateAsyncRun 
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Button _btnRun;
		private System.Windows.Forms.NumericUpDown _txtSecond;
		private System.Windows.Forms.Label _lblSecond;
		private System.Windows.Forms.ProgressBar _Progress;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null)
				{
					components.Dispose();
				}
			}
      
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent() 
		{
			this._btnRun = new System.Windows.Forms.Button();
			this._txtSecond = new System.Windows.Forms.NumericUpDown();
			this._lblSecond = new System.Windows.Forms.Label();
			this._Progress = new System.Windows.Forms.ProgressBar();
			((System.ComponentModel.ISupportInitialize)(this._txtSecond)).BeginInit();
			this.SuspendLayout();
			// 
			// _btnRun
			// 
			this._btnRun.Location = new System.Drawing.Point(195, 16);
			this._btnRun.Name = "_btnRun";
			this._btnRun.TabIndex = 2;
			this._btnRun.Text = "执行";
			this._btnRun.Click += new System.EventHandler(this._btnRun_Click);
			// 
			// _txtSecond
			// 
			this._txtSecond.Location = new System.Drawing.Point(107, 17);
			this._txtSecond.Maximum = new System.Decimal(new int[] {
																	   10000,
																	   0,
																	   0,
																	   0});
			this._txtSecond.Name = "_txtSecond";
			this._txtSecond.Size = new System.Drawing.Size(72, 20);
			this._txtSecond.TabIndex = 1;
			this._txtSecond.Value = new System.Decimal(new int[] {
																	 1,
																	 0,
																	 0,
																	 0});
			// 
			// _lblSecond
			// 
			this._lblSecond.Location = new System.Drawing.Point(19, 16);
			this._lblSecond.Name = "_lblSecond";
			this._lblSecond.Size = new System.Drawing.Size(64, 23);
			this._lblSecond.TabIndex = 0;
			this._lblSecond.Text = "执行秒数";
			// 
			// _Progress
			// 
			this._Progress.Dock = System.Windows.Forms.DockStyle.Bottom;
			this._Progress.Location = new System.Drawing.Point(0, 135);
			this._Progress.Maximum = 1;
			this._Progress.Name = "_Progress";
			this._Progress.Size = new System.Drawing.Size(288, 23);
			this._Progress.TabIndex = 3;
			// 
			// Form1
			// 
			this.AcceptButton = this._btnRun;
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(288, 158);
			this.Controls.Add(this._Progress);
			this.Controls.Add(this._lblSecond);
			this.Controls.Add(this._txtSecond);
			this.Controls.Add(this._btnRun);
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
			this.MaximizeBox = false;
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "委托异步方式执行";
			((System.ComponentModel.ISupportInitialize)(this._txtSecond)).EndInit();
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main()
		{
			Application.Run( new Form1() );
		}

		// 显示进度条
		void ShowProgress( int totalStep, int currentStep ) 
		{
			_Progress.Maximum = totalStep;
			_Progress.Value = currentStep;
		}

		// 执行任务的委托声明
		delegate void RunTaskDelegate( int seconds );

		// 执行任务
		void RunTask( int seconds )
		{
			// 每 1 / 4 秒 显示进度一次
			for( int i = 0; i < seconds * 4; i++ )
			{
				Thread.Sleep( 250 );

				// 显示进度条
				ShowProgress( seconds * 4, i + 1 );
			}
		}

		// 通过创建工作线程消除用户界面线程的阻塞问题
		private void _btnRun_Click( object sender, System.EventArgs e )
		{
			RunTaskDelegate runTask = new RunTaskDelegate( RunTask );

			// 委托同步调用方式
			//runTask( Convert.ToInt16( _txtSecond.Value ) );

			// 委托异步调用方式
			runTask.BeginInvoke( Convert.ToInt16( _txtSecond.Value ), null, null );
		}
	}
}