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  1. HttpHelper类:

    using System;
    using System.Collections.Specialized;
    using System.IO;
    using System.Net;
    using System.Text;
    
    namespace ConsoleApplication1
    {
        public static class HttpHelper
        {
            private static readonly Encoding DEFAULTENCODE = Encoding.UTF8;
    
            /// <summary>
            /// HttpUploadFile
            /// </summary>
            /// <param name="url"></param>
            /// <param name="file"></param>
            /// <param name="data"></param>
            /// <returns></returns>
            public static string HttpUploadFile(string url, string file, NameValueCollection data)
            {
                return HttpUploadFile(url, file, data, DEFAULTENCODE);
            }
    
            /// <summary>
            /// HttpUploadFile
            /// </summary>
            /// <param name="url"></param>
            /// <param name="file"></param>
            /// <param name="data"></param>
            /// <param name="encoding"></param>
            /// <returns></returns>
            public static string HttpUploadFile(string url, string file, NameValueCollection data, Encoding encoding)
            {
                return HttpUploadFile(url, new string[] { file }, data, encoding);
            }
    
            /// <summary>
            /// HttpUploadFile
            /// </summary>
            /// <param name="url"></param>
            /// <param name="files"></param>
            /// <param name="data"></param>
            /// <returns></returns>
            public static string HttpUploadFile(string url, string[] files, NameValueCollection data)
            {
                return HttpUploadFile(url, files, data, DEFAULTENCODE);
            }
    
            /// <summary>
            /// HttpUploadFile
            /// </summary>
            /// <param name="url"></param>
            /// <param name="files"></param>
            /// <param name="data"></param>
            /// <param name="encoding"></param>
            /// <returns></returns>
            public static string HttpUploadFile(string url, string[] files, NameValueCollection data, Encoding encoding)
            {
                string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");
                byte[] boundarybytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
                byte[] endbytes = Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
    
                //1.HttpWebRequest
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
                request.ContentType = "multipart/form-data; boundary=" + boundary;
                request.Method = "POST";
                request.KeepAlive = true;
                request.Credentials = CredentialCache.DefaultCredentials;
    
                using (Stream stream = request.GetRequestStream())
                {
                    //1.1 key/value
                    string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";
                    if (data != null)
                    {
                        foreach (string key in data.Keys)
                        {
                            stream.Write(boundarybytes, 0, boundarybytes.Length);
                            string formitem = string.Format(formdataTemplate, key, data[key]);
                            byte[] formitembytes = encoding.GetBytes(formitem);
                            stream.Write(formitembytes, 0, formitembytes.Length);
                        }
                    }
    
                    //1.2 file
                    string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: application/octet-stream\r\n\r\n";
                    byte[] buffer = new byte[4096];
                    int bytesRead = 0;
                    for (int i = 0; i < files.Length; i++)
                    {
                        stream.Write(boundarybytes, 0, boundarybytes.Length);
                        string header = string.Format(headerTemplate, "file" + i, Path.GetFileName(files[i]));
                        byte[] headerbytes = encoding.GetBytes(header);                    
                        stream.Write(headerbytes, 0, headerbytes.Length);
                        using (FileStream fileStream = new FileStream(files[i], FileMode.Open, FileAccess.Read))
                        {                        
                            while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                            {
                                stream.Write(buffer, 0, bytesRead);
                            }
                        }
                    }
    
                    //1.3 form end
                    stream.Write(endbytes, 0, endbytes.Length);
                }
                //2.WebResponse
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                using (StreamReader stream = new StreamReader(response.GetResponseStream()))
                {
                    return stream.ReadToEnd();
                }
            }
        }
    }
  2. 调用示例:

    using System;
    using System.Collections.Specialized;
    
    namespace ConsoleApplication1
    {
        class Program
        {
            static void Main(string[] args)
            {
                NameValueCollection data = new NameValueCollection();
                data.Add("name", "木子屋");
                data.Add("url", "http://www.mzwu.com/");
                Console.WriteLine(HttpHelper.HttpUploadFile("http://localhost/Test", new string[] { @"E:\Index.htm", @"E:\test.rar" }, data));
    
                Console.ReadKey();
            }
        }
    }
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