C#实现HTTP上传文件的方法

/// <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("\r\n--" + boundary + "\r\n");
    byte[] endBoundaryBytes = Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");
    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}\"\r\nContent-Type:application/octet-stream\r\n\r\n", 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;

}

接收文件代码

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("Success\r\n");
        }
    }
}

其他参考连接

C#HTTP文件上传和参数_c# http上传文件-CSDN博客