这是从我编写的一些示例代码中剪切并粘贴的，希望它能提供基础知识。目前仅支持文件数据和表单数据。
public class PostData{ private List<PostDataParam> m_Params; public List<PostDataParam> Params { get { return m_Params; } set { m_Params = value; } } public PostData() { m_Params = new List<PostDataParam>(); // Add sample param m_Params.Add(new PostDataParam("email", "MyEmail", PostDataParamType.Field)); } /// <summary> /// Returns the parameters array formatted for multi-part/form data /// </summary> /// <returns></returns> public string GetPostData() { // Get boundary, default is --AaB03x string boundary = ConfigurationManager.AppSettings["ContentBoundary"].ToString(); StringBuilder sb = new StringBuilder(); foreach (PostDataParam p in m_Params) { sb.AppendLine(boundary); if (p.Type == PostDataParamType.File) { sb.AppendLine(string.Format("Content-Disposition: file; name="{0}"; filename="{1}"", p.Name, p.FileName)); sb.AppendLine("Content-Type: text/plain"); sb.AppendLine(); sb.AppendLine(p.Value); } else { sb.AppendLine(string.Format("Content-Disposition: form-data; name="{0}"", p.Name)); sb.AppendLine(); sb.AppendLine(p.Value); } } sb.AppendLine(boundary); return sb.ToString(); }}public enum PostDataParamType{ Field, File}public class PostDataParam{ public PostDataParam(string name, string value, PostDataParamType type) { Name = name; Value = value; Type = type; } public string Name; public string FileName; public string Value; public PostDataParamType Type;}要发送数据，您需要：
HttpWebRequest oRequest = null;oRequest = (HttpWebRequest)HttpWebRequest.Create(oURL.URL);oRequest.ContentType = "multipart/form-data"; oRequest.Method = "POST";PostData pData = new PostData();byte[] buffer = encoding.GetBytes(pData.GetPostData());// Set content length of our dataoRequest.ContentLength = buffer.Length;// Dump our buffered postdata to the stream, booyahoStream = oRequest.GetRequestStream();oStream.Write(buffer, 0, buffer.Length);oStream.Close();// get the responseoResponse = (HttpWebResponse)oRequest.GetResponse();
希望这很清楚，我已经从一些来源进行了剪切和粘贴以使其更加简洁。
