利用WebClient实现文件传送

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
//添加命名引用空间
using System.Net;
using System.IO;
using System.Threading;

namespace 利用WebClient实现文件传送
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
//取消此异常以便跨线程访问控件
CheckForIllegalCrossThreadCalls = false;
}

private void StartDownload()
{
buttonDownLoad.Enabled = false;
string URI = textBoxURI.Text;
int n = URI.LastIndexOf('/');
string URIAddress = URI.Substring(0, n);
string fileName = URI.Substring(n + 1, URI.Length - n - 1);
string Dir = textBoxSavePath.Text;
string path = Dir + '\\' + fileName;
try
{
WebRequest myre = WebRequest.Create(URIAddress);
}
catch (WebException ex)
{
MessageBox.Show(ex.Message, "创建URI错误");
}
WebClient DownLoadClient = new WebClient();
try
{
statusStrip1.Items[0].Text = "开始下载文件……";
//将具有指定URI的资源下载到本地文件
DownLoadClient.DownloadFile(URI, path);
statusStrip1.Items[0].Text = "下载完成。";
}
catch (WebException ex)
{
MessageBox.Show(ex.Message, "下载错误");
statusStrip1.Items[0].Text = "";
}
buttonDownLoad.Enabled = true;
}

private void buttonDownLoad_Click(object sender, EventArgs e)
{
if (textBoxSavePath.Text == "")
{
MessageBox.Show("请选择保存路径后再下载");
return;
}
Thread thDownLoad = new Thread(new ThreadStart(StartDownload));
thDownLoad.Start();
}
//选择下载保存的文件夹
private void buttonFind1_Click(object sender, EventArgs e)
{
SaveFileDialog dlgSaveFile = new SaveFileDialog();
if (dlgSaveFile.ShowDialog() == DialogResult.OK)
{
string sFileInfo = dlgSaveFile.FileName;
textBoxSavePath.Text = sFileInfo.Substring(0, sFileInfo.LastIndexOf("\\"));
statusStrip1.Items[0].Text = "就绪";
}
}
//上传文件
private void StartUpLoad()
{
if (textBoxUpload.Text.Trim() == "" || textBoxURI.Text.Trim() == "")
{
MessageBox.Show("请输入要上载的文件名。", "错误",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
string filenamepath = textBoxUpload.Text.Trim();
string uristring = textBoxURI.Text.Trim();
string filename = filenamepath.Substring(filenamepath.LastIndexOf("\\") + 1);
if(uristring.EndsWith("/")==false)
{
uristring = uristring + "/";
}
uristring = uristring + filename;
//创建WebClient实例
WebClient UpLoadClient = new WebClient();
//获取与FTP服务器通信的凭据
UpLoadClient.Credentials = CredentialCache.DefaultCredentials;
//以文件流方式上传文件
FileStream fs = new FileStream(filename, FileMode.Open, FileAccess.Read);
//采用二进制数据流
BinaryReader r = new BinaryReader(fs);
try
{
byte[] postarray = r.ReadBytes((int)fs.Length);
//打开一个文件进行些操作
Stream poststream = UpLoadClient.OpenWrite(uristring, "put");
if (poststream.CanWrite)
{
poststream.Write(postarray, 0, postarray.Length);
statusStrip1.Items[0].Text = filename + "上传成功";
}
else
{
statusStrip1.Items[0].Text = "文件目前不可写";
}
poststream.Close();
}
catch (WebException ex)
{
statusStrip1.Items[0].Text = "上传失败" + ex.Message;
}
}
}

private void buttonFind_Click(object sender, 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)
{
textBoxUpload.Text = dlgOpenFile.FileName.ToString();
statusStrip1.Items[0].Text = "就绪";
}
}
}

private void buttonUpload_Click(object sender, EventArgs e)
{
Thread thUpload = new Thread(new ThreadStart(StartUpLoad));
thUpload.Start();
}
}
}