利用WebClient类向服务器上载文件

作者：孟宪会 出自：【孟宪会之精彩世界】 发布日期：2003年7月30日 17点44分10秒

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.NET 提供了许多上载文件的方法，在Windows Form应用程序中，我们可以使用WebClient类来实现。WebClient类也有两个方法可以上载，UploadFile和OpenWrite方法，下面就是一个实际的例子，两种方法都有代码：

结果如下：



C#代码如下：

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Net;
using System.Text;
using System.IO;


namespace UploadFile
{
  public class Form1 : System.Windows.Forms.Form
  {
    private System.Windows.Forms.Label label1;
    private System.Windows.Forms.Label label2;
    private System.Windows.Forms.Button button1;
    private System.Windows.Forms.Label label3;
    private System.Windows.Forms.Button button2;
    private System.Windows.Forms.TextBox txtFileName;
    private System.Windows.Forms.TextBox txtServerPath;
    private System.Windows.Forms.LinkLabel linkLabel1;
    
    private System.ComponentModel.Container components = null;

    public Form1()
    {
      InitializeComponent();
    }
    protected override void Dispose( bool disposing )
    {
      if( disposing )
      {
        if (components != null) 
        {
          components.Dispose();
        }
      }
      base.Dispose( disposing );
    }

    #region Windows Form Designer generated code
    private void InitializeComponent()
    {
      System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));
      this.label1 = new System.Windows.Forms.Label();
      this.txtServerPath = new System.Windows.Forms.TextBox();
      this.label2 = new System.Windows.Forms.Label();
      this.button1 = new System.Windows.Forms.Button();
      this.txtFileName = new System.Windows.Forms.TextBox();
      this.label3 = new System.Windows.Forms.Label();
      this.button2 = new System.Windows.Forms.Button();
      this.linkLabel1 = new System.Windows.Forms.LinkLabel();
      this.SuspendLayout();
      // 
      // label1
      // 
      this.label1.ForeColor = System.Drawing.Color.Red;
      this.label1.Location = new System.Drawing.Point(8, 96);
      this.label1.Name = "label1";
      this.label1.Size = new System.Drawing.Size(448, 16);
      this.label1.TabIndex = 0;
      this.label1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
      // 
      // txtServerPath
      // 
      this.txtServerPath.Location = new System.Drawing.Point(128, 8);
      this.txtServerPath.Name = "txtServerPath";
      this.txtServerPath.Size = new System.Drawing.Size(320, 21);
      this.txtServerPath.TabIndex = 1;
      this.txtServerPath.Text = "http://mengxianhui/aspxWeb/Images/";
      // 
      // label2
      // 
      this.label2.AutoSize = true;
      this.label2.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, 
                                  System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
      this.label2.ForeColor = System.Drawing.Color.Navy;
      this.label2.Location = new System.Drawing.Point(8, 12);
      this.label2.Name = "label2";
      this.label2.Size = new System.Drawing.Size(116, 17);
      this.label2.TabIndex = 2;
      this.label2.Text = "请输入服务器地址：";
      this.label2.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
      // 
      // button1
      // 
      this.button1.Location = new System.Drawing.Point(192, 64);
      this.button1.Name = "button1";
      this.button1.TabIndex = 3;
      this.button1.Text = "上载文件";
      this.button1.Click += new System.EventHandler(this.button1_Click);
      this.button1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.button1_MouseDown);
      // 
      // txtFileName
      // 
      this.txtFileName.Location = new System.Drawing.Point(128, 32);
      this.txtFileName.Name = "txtFileName";
      this.txtFileName.Size = new System.Drawing.Size(232, 21);
      this.txtFileName.TabIndex = 4;
      this.txtFileName.Text = "";
      // 
      // label3
      // 
      this.label3.AutoSize = true;
      this.label3.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, 
                                  System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
      this.label3.ForeColor = System.Drawing.Color.DarkBlue;
      this.label3.Location = new System.Drawing.Point(8, 38);
      this.label3.Name = "label3";
      this.label3.Size = new System.Drawing.Size(116, 17);
      this.label3.TabIndex = 5;
      this.label3.Text = "请输入上传文件名：";
      this.label3.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
      // 
      // button2
      // 
      this.button2.Location = new System.Drawing.Point(370, 32);
      this.button2.Name = "button2";
      this.button2.Size = new System.Drawing.Size(80, 23);
      this.button2.TabIndex = 6;
      this.button2.Text = "浏览文件…";
      this.button2.Click += new System.EventHandler(this.button2_Click);
      // 
      // linkLabel1
      // 
      this.linkLabel1.Location = new System.Drawing.Point(16, 120);
      this.linkLabel1.Name = "linkLabel1";
      this.linkLabel1.Size = new System.Drawing.Size(440, 24);
      this.linkLabel1.TabIndex = 7;
      this.linkLabel1.TextAlign = System.Drawing.ContentAlignment.MiddleCenter;
      this.linkLabel1.LinkClicked += new 
        System.Windows.Forms.LinkLabelLinkClickedEventHandler(this.linkLabel1_LinkClicked);
      // 
      // Form1
      // 
      this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
      this.BackColor = System.Drawing.SystemColors.Control;
      this.ClientSize = new System.Drawing.Size(464, 157);
      this.Controls.Add(this.linkLabel1);
      this.Controls.Add(this.button2);
      this.Controls.Add(this.txtFileName);
      this.Controls.Add(this.label3);
      this.Controls.Add(this.txtServerPath);
      this.Controls.Add(this.label2);
      this.Controls.Add(this.button1);
      this.Controls.Add(this.label1);
      this.Icon = ((System.Drawing.Icon)(resources.GetObject("$this.Icon")));
      this.Name = "Form1";
      this.Text = "WebClient 上传文件的例子";
      this.Resize += new System.EventHandler(this.Form1_Resize);
      this.ResumeLayout(false);

    }
    #endregion
    [STAThread]
    static void Main() 
    {
      Application.Run(new Form1());
    }

    /// <summary>
    /// .NET SDK 上面的打开文件的类
    /// </summary>

    private FileStream OpenFile()
    {
      OpenFileDialog dlgOpenFile = new OpenFileDialog();
      dlgOpenFile.ShowReadOnly = true;


      if(dlgOpenFile.ShowDialog() == DialogResult.OK)
      {
        if(dlgOpenFile.ReadOnlyChecked == true)
        {
          return (FileStream)dlgOpenFile.OpenFile();

        }
        else
        {
          string path = dlgOpenFile.FileName;
          return new FileStream(path, System.IO.FileMode.Open, 
            System.IO.FileAccess.ReadWrite);
        }
      }
      return null;
    }

    private void button2_Click(object sender, System.EventArgs e)
    {
      OpenFileDialog dlgOpenFile = new OpenFileDialog();
      dlgOpenFile.InitialDirectory = @"C:\";
      dlgOpenFile.ShowReadOnly = false;
      dlgOpenFile.ReadOnlyChecked = true;
      dlgOpenFile.Filter = "所有文件 (*.*)|*.*";
      if(dlgOpenFile.ShowDialog() == DialogResult.OK)
      {
        if(dlgOpenFile.ReadOnlyChecked == true)
        {
          txtFileName.Text = dlgOpenFile.FileName.ToString();
        }
      }
    }

    private void button1_Click(object sender, System.EventArgs e)
    {
      // 需要注意的是：txtServerPath文件夹有匿名可写的权限。
      // 可以自己定义新文件名字
      if(txtFileName.Text.Trim() == "" || txtServerPath.Text.Trim() == "")
      {
        MessageBox.Show("请输入你要上载的文件名字！","错误：", MessageBoxButtons.OK,
                                                         MessageBoxIcon.Information); 
      }
      else
      {
        /// 得到文件名，文件扩展名字，服务器路径
        string fileNamePath = txtFileName.Text.Trim();
        string uriString = txtServerPath.Text.Trim();
        string fileName = fileNamePath.Substring(fileNamePath.LastIndexOf("\\") + 1); 
        string fileNameExt = fileName.Substring(fileName.LastIndexOf(".") + 1);
        if(uriString.EndsWith("/") == false) uriString = uriString + "/";

        uriString = uriString + fileName;
        /// 创建WebClient实例
        WebClient myWebClient = new WebClient();
        myWebClient.Credentials = CredentialCache.DefaultCredentials;

        // 要上传的文件
        FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
        //FileStream fs = OpenFile();
        BinaryReader r = new BinaryReader(fs);
        try
        {
          //使用UploadFile方法可以用下面的格式
          //myWebClient.UploadFile(uriString,"PUT",fileNamePath);
          byte[] postArray = r.ReadBytes((int)fs.Length);
          Stream postStream = myWebClient.OpenWrite(uriString,"PUT");
          if(postStream.CanWrite)
          {
            postStream.Write(postArray,0,postArray.Length);
            label1.Text = fileName + "上传成功！";
          }
          else
          {
            label1.Text = "文件目前不可写！";
          }
          postStream.Close();
          linkLabel1.Text = "查看上载的文件";
          for(int i = linkLabel1.Links.Count - 1;i>-1;i--)
          linkLabel1.Links.Remove(linkLabel1.Links[i]);
          linkLabel1.Links.Add(0,linkLabel1.Text.Length,uriString);          
        }
        catch(WebException errMsg)
        {
          label1.Text="上传失败：" + errMsg.Message;
        }
      }
    }

    private void linkLabel1_LinkClicked(object sender, System.Windows.Forms.LinkLabelLinkClickedEventArgs e)
    {
      this.WindowState = FormWindowState.Minimized;
      this.linkLabel1.Links[linkLabel1.Links.IndexOf(e.Link)].Visited = true;
      string target = e.Link.LinkData as string;
      if(null != target)
      {
        System.Diagnostics.Process.Start(target);
      }
      else
      {    
        MessageBox.Show("请用浏览器访问：" + target);
      }
    }

    private void Form1_Resize(object sender, System.EventArgs e)
    {
      if(this.WindowState == FormWindowState.Maximized) this.WindowState = FormWindowState.Normal;
    }

    private void button1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
    {
      if(txtFileName.Text.Trim() != "" && txtServerPath.Text.Trim() != "")
      label1.Text = "正在上传文件，请稍侯……！";
    }  
  }
}