使用C#在进度条中显示复制文件的进度

Code List:

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/*****************************************************************

** File Name: frmMain.cs

** Copyright (c) 1999 -2003

** Creator: FirePhoenix

** Created Date: 2004-11-13 15:24

** Modifier:

** Modify Date:

** Description:

** Version:1.0

******************************************************************/

#region Using Directives

using System;

using System.IO ;

using System.Xml ;

using System.Collections ;

using System.Reflection ;

using System.Text ;

using System.Data ;

using System.ComponentModel;

using System.Windows.Forms;

using System.Drawing;

using System.Threading ;

#endregion

namespace WindowsApplication4

{

/// <summary>

/// Copy Large File

/// </summary>

public class frmMain : System.Windows.Forms.Form

{

#region

private System.Windows.Forms.ProgressBar progressBar1;

private System.Windows.Forms.Button btnCopy;

/// <summary>

/// 必需的设计器变量。

/// </summary>

private System.ComponentModel.Container components = null;

public frmMain()

{

//

// Windows 窗体设计器支持所必需的

//

InitializeComponent();

//

// TODO: 在 InitializeComponent 调用后添加任何构造函数代码

//

}

/// <summary>

/// 清理所有正在使用的资源。

/// </summary>

protected override void Dispose( bool disposing )

{

if( disposing )

{

if (components != null)

{

components.Dispose();

}

}

base.Dispose( disposing );

}

#region Initialize Components

/// <summary>

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.progressBar1 = new System.Windows.Forms.ProgressBar();

this.btnCopy = new System.Windows.Forms.Button();

this.SuspendLayout();

//

// progressBar1

//

this.progressBar1.Location = new System.Drawing.Point(8, 16);

this.progressBar1.Name = "progressBar1";

this.progressBar1.Size = new System.Drawing.Size(208, 16);

this.progressBar1.TabIndex = 0;

//

// btnCopy

//

this.btnCopy.Location = new System.Drawing.Point(8, 48);

this.btnCopy.Name = "btnCopy";

this.btnCopy.TabIndex = 1;

this.btnCopy.Text = "Copy";

this.btnCopy.Click += new System.EventHandler(this.btnCopy_Click);

//

// frmMain

//

this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);

this.ClientSize = new System.Drawing.Size(232, 77);

this.Controls.Add(this.btnCopy);

this.Controls.Add(this.progressBar1);

this.Name = "frmMain";

this.Text = "Copy File";

this.ResumeLayout(false);

}

#endregion

/// <summary>

/// Entry Point

/// </summary>

[STAThread]

static void Main()

{

Application.Run(new frmMain());

}

#endregion

int totalSize; //Total Size

int position; //Position

const int BUFFER_SIZE = 4096;

byte[] buffer;

Stream stream;

private void btnCopy_Click(object sender, System.EventArgs e)

{

string strFile = "";

OpenFileDialog dlg = new OpenFileDialog();

if ( dlg.ShowDialog() == DialogResult.OK )

{

strFile = dlg.FileName ;

}

else

{

return ;

}

FileStream fs = new FileStream( strFile , FileMode.Open , FileAccess.Read ) ;

totalSize = (int)fs.Length ;

stream = fs;

//Delete file which aready exists.

if ( File.Exists( "c:\\copyedFile.bin" ) )

File.Delete( "c:\\copyedFile.bin" );

//Copy file while larger than 4KB.

if ( totalSize > BUFFER_SIZE )

{

buffer = new byte[ BUFFER_SIZE ];

// Async Invoke

stream.BeginRead( buffer , 0 , BUFFER_SIZE , new AsyncCallback( AsyncCopyFile ) , null );

}

else

{

fs.Close();

}

}

/// <summary>

/// Asynchronously copy file

/// </summary>

/// <param name="ar"></param>

private void AsyncCopyFile( IAsyncResult ar )

{

int readedLength ;

// Lock FileStream

lock( stream )

{

readedLength = stream.EndRead( ar ); // When stream endread, get readed length

}

// Write to disk

FileStream fsWriter = new FileStream( "C:\\copyedFile.bin" , FileMode.Append , FileAccess.Write );

fsWriter.Write( buffer , 0 , buffer.Length );

fsWriter.Close();

// Current stream position

position += readedLength;

// Response UI

MethodInvoker m = new MethodInvoker( SynchProgressBar );

m.BeginInvoke( null , null );

if ( position >= totalSize ) // Read over.

{

stream.Close(); //Close FileStream

return ;

}

// Continue to read and write

lock ( stream )

{

int leftSize = totalSize - position;

if ( leftSize < BUFFER_SIZE )

buffer = new byte[ leftSize ];

stream.BeginRead( buffer , 0 , buffer.Length , new AsyncCallback( AsyncCopyFile ) , null );

}

}

private void SynchProgressBar()

{

this.progressBar1.Maximum = totalSize;

this.progressBar1.Value = position ;

}

}

}