C# 文件管理系统 上传 下载
怎样用C#编写一个文件管理系统，提供文件的上传、下载、浏览、检索功能。
[解决办法]
百度吧，里面有很多你需要的例子。
[解决办法]
上传，下载，浏览信息全部保存在数据库啊！~~
他要下载就给他个文件保存的路径，他要上传就往数据库里面存一条保存路径，他要查询就给浏览次数+1不就OK 了~~~
[解决办法]
using System;
using System.Collections.Generic;
using System.Text;
using System.Collections.Specialized;
using System.Net;
using System.Net.Sockets;
using System.IO;
namespace CompleteClient
{
/// <summary>
/// 文件发送工作类
/// </summary>
class PostFile
{
/// <summary>
/// 通过post发送指定文件的指定字段到指定的uri上
/// </summary>
/// <param name="uploadfile">上传文件路径</param>
/// <param name="url">上传的到的URi位置</param>
/// <param name="offset">当前偏移量</param>
/// <param name="size">需要发送的块大小</param>
/// <param name="fileFormName">服务器端"GET"取得的文件名</param>
/// <param name="contenttype">文件类型(保留用)</param>
/// <param name="querystring">GET数组(供服务器用GET取得一些信息)</param>
/// <param name="cookies">本地cookies(保留用)</param>
/// <returns>uri的response的内容以string的形式返回</returns>
public string UploadFileEx(string uploadfile, string url, long offset, long size,
string fileFormName, string contenttype,
NameValueCollection querystring, CookieContainer cookies)
{
if ((fileFormName == null)
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(fileFormName.Length == 0))
{
fileFormName = "file";
}
if ((contenttype == null)
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(contenttype.Length == 0))
{
contenttype = "application/octet-stream";
}
string postdata;
postdata = "?";
if (querystring != null)
{
foreach (string key in querystring.Keys)
{
postdata += key + "=" + querystring.Get(key) + "&";
}
}
Uri uri = new Uri(url + postdata);
string boundary = "----------" + DateTime.Now.Ticks.ToString("x");
HttpWebRequest webrequest = (HttpWebRequest)WebRequest.Create(uri);
webrequest.CookieContainer = cookies;
webrequest.ContentType = "multipart/form-data; boundary=" + boundary;
webrequest.Method = "POST";
// 构造一个post请求的http头
StringBuilder sb = new StringBuilder();
sb.Append("--");
sb.Append(boundary);
sb.Append("\r\n");
sb.Append("Content-Disposition: form-data; name="");
sb.Append(fileFormName);
sb.Append(""; filename="");
sb.Append(Path.GetFileName(uploadfile));
sb.Append(""");
sb.Append("\r\n");
sb.Append("Content-Type: ");
sb.Append(contenttype);
sb.Append("\r\n");
sb.Append("\r\n");
string postHeader = sb.ToString();
byte[] postHeaderBytes = Encoding.UTF8.GetBytes(postHeader);
// Build the trailing boundary string as a byte array
// ensuring the boundary appears on a line by itself
byte[] boundaryBytes =
Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
FileStream fileStream = new FileStream(uploadfile,
FileMode.Open, FileAccess.Read);
long length = postHeaderBytes.Length + (long)size +
boundaryBytes.Length;
webrequest.ContentLength = length;
Stream requestStream = webrequest.GetRequestStream();
// 写入post头
requestStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);
// 写入文件内容
byte[] buffer = new Byte[size];
fileStream.Seek(offset, SeekOrigin.Current);
fileStream.Read(buffer, 0, buffer.Length);
requestStream.Write(buffer, 0, buffer.Length);
// 写入post请求的尾
requestStream.Write(boundaryBytes, 0, boundaryBytes.Length);
//读取服务器的反馈消息
WebResponse responce = webrequest.GetResponse();
Stream s = responce.GetResponseStream();
StreamReader sr = new StreamReader(s);
return sr.ReadToEnd();
}
}
}
