www.pudn.com > CS.rar > Disposer.cs

//----------------------------------------------------------------------------- 
// Code from _Programming the .NET Compact Framework with C#_ 
// and _Programming the .NET Compact Framework with VB_ 
// (c) Copyright 2002-2004 Paul Yao and David Durant.  
// All rights reserved. 
//----------------------------------------------------------------------------- 
 
using System; 
using System.Drawing; 
using System.Collections; 
using System.Windows.Forms; 
using System.Data; 
 
namespace Disposer 
{ 
   /// 
 
   /// Summary description for Form1. 
   /// 
 
   public class FormMain : System.Windows.Forms.Form 
   { 
      private System.Windows.Forms.Button cmdCreate; 
      private System.Windows.Forms.Button cmdDereference; 
      private System.Windows.Forms.Button cmdCollect; 
      private System.Windows.Forms.Button cmdDispose; 
      private System.Windows.Forms.Button cmdSuppress; 
      private System.Windows.Forms.MainMenu mainMenu1; 
 
      public FormMain() 
      { 
         // 
         // Required for Windows Form Designer support 
         // 
         InitializeComponent(); 
      } 
 
      /// 
 
      /// Clean up any resources being used. 
      /// 
 
      protected override void Dispose( bool disposing ) 
      { 
         base.Dispose( disposing ); 
      } 
      #region Windows Form Designer generated code 
      /// 
 
      /// Required method for Designer support - do not modify 
      /// the contents of this method with the code editor. 
      /// 
 
      private void InitializeComponent() 
      { 
         this.mainMenu1 = new System.Windows.Forms.MainMenu(); 
         this.cmdCreate = new System.Windows.Forms.Button(); 
         this.cmdDereference = new System.Windows.Forms.Button(); 
         this.cmdCollect = new System.Windows.Forms.Button(); 
         this.cmdDispose = new System.Windows.Forms.Button(); 
         this.cmdSuppress = new System.Windows.Forms.Button(); 
         //  
         // cmdCreate 
         //  
         this.cmdCreate.Location = new System.Drawing.Point(24, 40); 
         this.cmdCreate.Size = new System.Drawing.Size(128, 20); 
         this.cmdCreate.Text = "1) Create Object"; 
         this.cmdCreate.Click += new System.EventHandler(this.cmdCreate_Click); 
         //  
         // cmdDereference 
         //  
         this.cmdDereference.Location = new System.Drawing.Point(24, 160); 
         this.cmdDereference.Size = new System.Drawing.Size(128, 20); 
         this.cmdDereference.Text = "4) DeReference"; 
         this.cmdDereference.Click += new System.EventHandler(this.cmdDereference_Click); 
         //  
         // cmdCollect 
         //  
         this.cmdCollect.Location = new System.Drawing.Point(24, 200); 
         this.cmdCollect.Size = new System.Drawing.Size(128, 20); 
         this.cmdCollect.Text = "5) Garbage Collect"; 
         this.cmdCollect.Click += new System.EventHandler(this.cmdCollect_Click); 
         //  
         // cmdDispose 
         //  
         this.cmdDispose.Location = new System.Drawing.Point(24, 80); 
         this.cmdDispose.Size = new System.Drawing.Size(128, 20); 
         this.cmdDispose.Text = "2) Dispose"; 
         this.cmdDispose.Click += new System.EventHandler(this.cmdDispose_Click); 
         //  
         // cmdSuppress 
         //  
         this.cmdSuppress.Location = new System.Drawing.Point(24, 120); 
         this.cmdSuppress.Size = new System.Drawing.Size(128, 20); 
         this.cmdSuppress.Text = "3) Suppress Finalize"; 
         this.cmdSuppress.Click += new System.EventHandler(this.cmdSuppress_Click); 
         //  
         // FormMain 
         //  
         this.Controls.Add(this.cmdSuppress); 
         this.Controls.Add(this.cmdDispose); 
         this.Controls.Add(this.cmdCollect); 
         this.Controls.Add(this.cmdDereference); 
         this.Controls.Add(this.cmdCreate); 
         this.Menu = this.mainMenu1; 
         this.MinimizeBox = false; 
         this.Text = "Disposer"; 
 
      } 
      #endregion 
 
      /// 
 
      /// The main entry point for the application. 
      /// 
 
 
      static void Main()  
      { 
         Application.Run(new FormMain()); 
      } 
 
      ResourceWrapper rw = null; 
 
      private void cmdCreate_Click(object sender, EventArgs e) 
      { 
         rw = new ResourceWrapper(); 
      } 
 
      private void cmdDispose_Click(object sender, EventArgs e) 
      { 
         if(rw == null) 
            MessageBox.Show("rw == null -> Exception!"); 
         else 
            rw.Dispose(); 
      } 
 
      private void cmdSuppress_Click(object sender, EventArgs e) 
      { 
         if(rw == null) 
            MessageBox.Show("rw == null -> Exception!"); 
         else 
            GC.SuppressFinalize(rw); 
      } 
 
      private void cmdDereference_Click(object sender, EventArgs e) 
      { 
         rw = null; 
      } 
 
      private void cmdCollect_Click(object sender, EventArgs e) 
      { 
         GC.Collect(); 
      } 
 
 
   } // class FormMain 
 
   // 
   // Simple resource wrapper class to demonstrate managed-code 
   // support for manual cleanup functions 
   // 
   public class ResourceWrapper : System.Object, IDisposable 
   { 
      public ResourceWrapper() 
      { 
         MessageBox.Show("Constructor called"); 
      } 
      ~ResourceWrapper() 
      { 
         MessageBox.Show("Finalize called"); 
         Dispose(false); 
 
         // Call Dispose when supported by base class. 
         // base.Dispose(); 
      } 
      public void Dispose() 
      { 
         MessageBox.Show("Public Dispose called"); 
         Dispose(true); 
      } 
 
      protected void Dispose(bool bDisposing) 
      { 
         if (bDisposing) 
            MessageBox.Show("Dispose(true) -- are disposing"); 
         else 
            MessageBox.Show("Dispose(false) -- are finalizing"); 
      } 
   } // class ResourceWrapper 
 
} // namespace