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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： <![CDATA[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……！";
}
}
}
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