问题：HttpWebRequest request post 传参； 结果：好用的C# HttpWebRequest用P
在项目中，本来都是在站内进行数据交互的，后来又加进来一个买的php网站（艹）。需要进行数据交互，在没有考虑使用web服务的情况下，只有通过Post提交到页面进行数据交互是最好的方式了。
我这边使用的是C#，在C#中需要将本页面获取的数据，保存数据库的同时，提交给php那边。这里有一个功能是这样的：
1、提交多个参数
2、同时提交文件。
这里就需要这样一个类实现上述功能。通过搜索后，分享一下类，算是很好用的C# HttpWebRequest用Post同时提交参数和文件的封装类。
类：
private static string HttpPostData(string url, int timeOut, string fileKeyName,
string filePath, NameValueCollection stringDict)
{
string responseContent;
var memStream = new MemoryStream();
var webRequest = (HttpWebRequest)WebRequest.Create(url);
// 边界符
var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");
// 边界符
var beginBoundary = Encoding.ASCII.GetBytes("--" + boundary + "\r\n");
var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
// 最后的结束符
var endBoundary = Encoding.ASCII.GetBytes("--" + boundary + "--\r\n");
// 设置属性
webRequest.Method = "POST";
webRequest.Timeout = timeOut;
webRequest.ContentType = "multipart/form-data; boundary=" + boundary;
// 写入文件
const string filePartHeader =
"Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\n"+
"Content-Type: application/octet-stream\r\n\r\n";
var header = string.Format(filePartHeader, fileKeyName, filePath);
var headerbytes = Encoding.UTF8.GetBytes(header);
memStream.Write(beginBoundary, 0, beginBoundary.Length);
memStream.Write(headerbytes, 0, headerbytes.Length);
var buffer = new byte[1024];
int bytesRead; // =0
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
memStream.Write(buffer, 0, bytesRead);
}
// 写入字符串的Key
var stringKeyHeader = "\r\n--" + boundary +
"\r\nContent-Disposition: form-data; name=\"{0}\""+
"\r\n\r\n{1}\r\n";
foreach (byte[] formitembytes in from string key in stringDict.Keys
select string.Format(stringKeyHeader, key, stringDict[key])
into formitem
select Encoding.UTF8.GetBytes(formitem))
{
memStream.Write(formitembytes, 0, formitembytes.Length);
}
// 写入最后的结束边界符
memStream.Write(endBoundary, 0, endBoundary.Length);
webRequest.ContentLength = memStream.Length;
var requestStream = webRequest.GetRequestStream();
memStream.Position = 0;
var tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
memStream.Close();
requestStream.Write(tempBuffer, 0, tempBuffer.Length);
requestStream.Close();
var httpWebResponse = (HttpWebResponse)webRequest.GetResponse();
using (var httpStreamReader = new StreamReader(httpWebResponse.GetResponseStream(),
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