使用WebClient实现文件上传

<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 UpLoad
{
 /// <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.Button btnSelect;
  private System.Windows.Forms.Button btnUpLoad;
  private System.Windows.Forms.StatusBar stBar;
  private System.Windows.Forms.OpenFileDialog openFile;
  private System.Windows.Forms.ListBox lstFiles;
  private System.Windows.Forms.Button btnDelete;
  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.btnSelect = new System.Windows.Forms.Button();
   this.btnUpLoad = new System.Windows.Forms.Button();
   this.stBar = new System.Windows.Forms.StatusBar();
   this.openFile = new System.Windows.Forms.OpenFileDialog();
   this.lstFiles = new System.Windows.Forms.ListBox();
   this.btnDelete = new System.Windows.Forms.Button();
   this.SuspendLayout();
   //
   // label1
   //
   this.label1.Location = new System.Drawing.Point(24, 15);
   this.label1.Name = "label1";
   this.label1.Size = new System.Drawing.Size(48, 23);
   this.label1.TabIndex = 0;
   this.label1.Text = "上传到:";
   //
   // label2
   //
   this.label2.Location = new System.Drawing.Point(8, 56);
   this.label2.Name = "label2";
   this.label2.Size = new System.Drawing.Size(64, 23);
   this.label2.TabIndex = 1;
   this.label2.Text = "上传文件:";
   //
   // txtURI
   //
   this.txtURI.Location = new System.Drawing.Point(80, 16);
   this.txtURI.Name = "txtURI";
   this.txtURI.Size = new System.Drawing.Size(256, 21);
   this.txtURI.TabIndex = 2;
   this.txtURI.Text = "";
   //
   // btnSelect
   //
   this.btnSelect.Location = new System.Drawing.Point(336, 56);
   this.btnSelect.Name = "btnSelect";
   this.btnSelect.TabIndex = 4;
   this.btnSelect.Text = "选择...";
   this.btnSelect.Click += new System.EventHandler(this.btnSelect_Click);
   //
   // btnUpLoad
   //
   this.btnUpLoad.Location = new System.Drawing.Point(336, 120);
   this.btnUpLoad.Name = "btnUpLoad";
   this.btnUpLoad.TabIndex = 5;
   this.btnUpLoad.Text = "开始上传";
   this.btnUpLoad.Click += new System.EventHandler(this.btnUpLoad_Click);
   //
   // stBar
   //
   this.stBar.Location = new System.Drawing.Point(0, 176);
   this.stBar.Name = "stBar";
   this.stBar.ShowPanels = true;
   this.stBar.Size = new System.Drawing.Size(424, 22);
   this.stBar.TabIndex = 6;
   //
   // openFile
   //
   this.openFile.Multiselect = true;
   this.openFile.Title = "选择上传问文件";
   //
   // lstFiles
   //
   this.lstFiles.ItemHeight = 12;
   this.lstFiles.Location = new System.Drawing.Point(80, 56);
   this.lstFiles.Name = "lstFiles";
   this.lstFiles.Size = new System.Drawing.Size(256, 88);
   this.lstFiles.TabIndex = 7;
   //
   // btnDelete
   //
   this.btnDelete.Location = new System.Drawing.Point(336, 88);
   this.btnDelete.Name = "btnDelete";
   this.btnDelete.TabIndex = 8;
   this.btnDelete.Text = "从列表删除";
   this.btnDelete.Click += new System.EventHandler(this.btnDelete_Click);
   //
   // Form1
   //
   this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
   this.ClientSize = new System.Drawing.Size(424, 198);
   this.Controls.Add(this.btnDelete);
   this.Controls.Add(this.lstFiles);
   this.Controls.Add(this.stBar);
   this.Controls.Add(this.btnUpLoad);
   this.Controls.Add(this.btnSelect);
   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(openFile.ShowDialog()==DialogResult.Cancel)
   {
    return;
   }
   for(int i=0;i<openFile.FileNames.Length;i++)
   {
    if(!lstFiles.Items.Contains(openFile.FileNames[i]))
    {
     lstFiles.Items.Add(openFile.FileNames[i]);
    }
   }
  }

  private void btnDelete_Click(object sender, System.EventArgs e)
  {
   if(lstFiles.SelectedIndex==-1)
   {
    return;
   }
   lstFiles.Items.RemoveAt(lstFiles.SelectedIndex);
  }

  private void btnUpLoad_Click(object sender, System.EventArgs e)
  {
   Thread th=new Thread(new ThreadStart(StartUpLoad));
   th.Start();
  }
  private void StartUpLoad()
  {
   string url=txtURI.Text;
   string path=string.Empty;
   int i=0;
   btnUpLoad.Enabled=false;
   try
   {
    stBar.Text="开始上传文件...";
    for(int j=0;j<lstFiles.Items.Count;j++)
    {
     stBar.Text="开始上传文件"+lstFiles.Items[j].ToString();
     client.UploadFile(url,"POST",lstFiles.Items[j].ToString());
     i++;
     stBar.Text=i.ToString()+"个文件上传";
    }
    stBar.Text="上传文件结束,总共上传"+i.ToString()+"个文件!";
   }
   catch(WebException ex)
   {
    MessageBox.Show(ex.Message,"Error");
    stBar.Text="上传中断";
   }
   finally
   {
    btnUpLoad.Enabled=true;
   }
  }
 }
}
</xmp>

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