截图
<xmp>
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO;
using System.Net;
using System.Threading;
namespace DownLoad
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox txtURI;
private System.Windows.Forms.TextBox txtPath;
private System.Windows.Forms.Button btnSelect;
private System.Windows.Forms.Button btnDownLoad;
private System.Windows.Forms.StatusBar stBar;
private System.Windows.Forms.FolderBrowserDialog folderBD;
//使用WebClient的方法以实现文件的下载
private WebClient client=new WebClient();
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// 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 Windows 窗体设计器生成的代码
/// <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.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.txtURI = new System.Windows.Forms.TextBox();
this.txtPath = new System.Windows.Forms.TextBox();
this.folderBD = new System.Windows.Forms.FolderBrowserDialog();
this.btnSelect = new System.Windows.Forms.Button();
this.btnDownLoad = new System.Windows.Forms.Button();
this.stBar = new System.Windows.Forms.StatusBar();
this.SuspendLayout();
//
// label1
//
this.label1.Location = new System.Drawing.Point(8, 24);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(96, 23);
this.label1.TabIndex = 0;
this.label1.Text = "下载文件的URI:";
//
// label2
//
this.label2.Location = new System.Drawing.Point(16, 64);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(88, 23);
this.label2.TabIndex = 1;
this.label2.Text = "本地保存路径:";
//
// txtURI
//
this.txtURI.Location = new System.Drawing.Point(112, 25);
this.txtURI.Name = "txtURI";
this.txtURI.Size = new System.Drawing.Size(208, 21);
this.txtURI.TabIndex = 2;
this.txtURI.Text = "";
//
// txtPath
//
this.txtPath.Location = new System.Drawing.Point(112, 65);
this.txtPath.Name = "txtPath";
this.txtPath.Size = new System.Drawing.Size(208, 21);
this.txtPath.TabIndex = 3;
this.txtPath.Text = "";
//
// btnSelect
//
this.btnSelect.Location = new System.Drawing.Point(328, 64);
this.btnSelect.Name = "btnSelect";
this.btnSelect.TabIndex = 4;
this.btnSelect.Text = "选择路径...";
this.btnSelect.Click += new System.EventHandler(this.btnSelect_Click);
//
// btnDownLoad
//
this.btnDownLoad.Location = new System.Drawing.Point(112, 104);
this.btnDownLoad.Name = "btnDownLoad";
this.btnDownLoad.TabIndex = 5;
this.btnDownLoad.Text = "下载";
this.btnDownLoad.Click += new System.EventHandler(this.btnDownLoad_Click);
//
// stBar
//
this.stBar.Location = new System.Drawing.Point(0, 184);
this.stBar.Name = "stBar";
this.stBar.Size = new System.Drawing.Size(424, 22);
this.stBar.TabIndex = 6;
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(424, 206);
this.Controls.Add(this.stBar);
this.Controls.Add(this.btnDownLoad);
this.Controls.Add(this.btnSelect);
this.Controls.Add(this.txtPath);
this.Controls.Add(this.txtURI);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void btnSelect_Click(object sender, System.EventArgs e)
{
if(folderBD.ShowDialog()==DialogResult.Cancel)
{
return;
}
txtPath.Text=folderBD.SelectedPath;
}
private void btnDownLoad_Click(object sender, System.EventArgs e)
{
//开启线程,以改善用户体验.
Thread th=new Thread(new ThreadStart(StartDownLoad));
//th.Name="New DownLoad";
th.Start();
}
private void StartDownLoad()
{
string url=string.Empty;
string fileName=string.Empty;
int n=0;
string path=string.Empty;
btnDownLoad.Enabled=false;
url=txtURI.Text;
n=url.LastIndexOf('/');
fileName=url.Substring(n+1);
path=txtPath.Text+"\\"+fileName;
try
{
WebRequest request=WebRequest.Create(url);
}
catch(WebException ex)
{
MessageBox.Show(ex.Message,"Error");
}
try
{
stBar.Text="开始下载文件...";
client.DownloadFile(url,path);
stBar.Text="下载完毕,文件已经保存到"+path.ToString();
}
catch(WebException ex)
{
MessageBox.Show(ex.Message,"Error");
stBar.Text=string.Empty;
}
finally
{
btnDownLoad.Enabled=true;
}
}
}
}
</xmp> 
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