.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 ); }
Windows Form Designer generated code [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……！"; } }
}