本文实例讲述了C#实现HTTP上传文件的方法。分享给大家供大家参考。具体实现方法如下：

发送文件代码如下：

复制代码 代码如下:

/// <summary>

/// Http上传文件

/// </summary>

public static string HttpUploadFile(string url, string path)

{

// 设置参数

HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;

CookieContainer cookieContainer = new CookieContainer();

request.CookieContainer = cookieContainer;

request.AllowAutoRedirect = true;

request.Method = "POST";

string boundary = DateTime.Now.Ticks.ToString("X"); // 随机分隔线

request.ContentType = "multipart/form-data;charset=utf-8;boundary=" + boundary;

byte[] itemBoundaryBytes = Encoding.UTF8.GetBytes("rn--" + boundary + "rn");

byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("rn--" + boundary + "--rn");

int pos = path.LastIndexOf("");

string fileName = path.Substring(pos + 1);

//请求头部信息

StringBuilder sbHeader = new StringBuilder(string.Format("Content-Disposition:form-data;name="file";filename="{0}"rnContent-Type:application/octet-streamrnrn", fileName));

byte[] postHeaderBytes = Encoding.UTF8.GetBytes(sbHeader.ToString());

FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);

byte[] bArr = new byte[fs.Length];

fs.Read(bArr, 0, bArr.Length);

fs.Close();

Stream postStream = request.GetRequestStream();

postStream.Write(itemBoundaryBytes, 0, itemBoundaryBytes.Length);

postStream.Write(postHeaderBytes, 0, postHeaderBytes.Length);

postStream.Write(bArr, 0, bArr.Length);

postStream.Write(endBoundaryBytes, 0, endBoundaryBytes.Length);

postStream.Close();

//发送请求并获取相应回应数据

HttpWebResponse response = request.GetResponse() as HttpWebResponse;

//直到request.GetResponse()程序才开始向目标网页发送Post请求

Stream instream = response.GetResponseStream();

StreamReader sr = new StreamReader(instream, Encoding.UTF8);

//返回结果网页（html）代码

string content = sr.ReadToEnd();

return content;

}

接收文件的代码如下：

复制代码 代码如下:

using System;

using System.Web;

namespace SWX

{

public partial class test2 : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

HttpPostedFile file = Request.Files[0];

file.SaveAs(MapPath("UploadFile" + file.FileName));

Response.Write("Successrn");

}

}

}

希望本文所述对大家的C#程序设计有所帮助。