C# HttpWebRequest和 webclient 的POST方法

WebClient:
1.post字符串
public string SendField_wc(string URL,string CookieData, string postData)
{
WebClient myWebClient = new WebClient();
myWebClient.Headers.Add("Cookie", CookieData);
//添加文章
myWebClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
//发送的字符转为字节流
byte[] sendData = http://www.mamicode.com/Encoding.GetEncoding("utf-8").GetBytes(postData.ToString());
//长度
myWebClient.Headers.Add("ContentLength", sendData.Length.ToString());
//提交
byte[] recData = http://www.mamicode.com/myWebClient.UploadData(URL,"POST", sendData);
//显示返回值注意编码
return(Encoding.GetEncoding("utf-8").GetString(recData));

}
2.post文件
public string SendFile_wc(string URL, string CookieData, string FilePath)
{
WebClient myWebClient = new WebClient();
myWebClient.Headers.Add("Cookie", CookieData);
byte[] responseArray = myWebClient.UploadFile(URL, "POST",FilePath);
string resmsg = Encoding.GetEncoding("utf-8").GetString(responseArray);
return resmsg;
}

HttpWebRequest:
cookie处理方法：
private CookieContainer GetUriCookieContainer(Uri uri, string cookieData)
{
//定义CookieCollection 对象的集合提供容器
CookieContainer cookies = null;
//判断是否存在字符串
if (cookieData.Length > 0)
{
//实例化CookieCollection对象
cookies = new CookieContainer();
//分解出cookie字符串
string[] cooks = cookieData.Split(‘;‘);
//遍历所有数组
for (int i = 0; i < cooks.Length; i++)
{
//将字符中的逗号替换
cooks[i] = cooks[i].Replace(",", "%2C");
//设置cookie信息
cookies.SetCookies(uri, cooks[i]);
}
}
return cookies;
}

1.post字符串
public string SendField_wbr(string URL, string CookieData, string postData)
{
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
try
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(URL);
//设置cookie
Uri uri = new Uri(URL);
request.CookieContainer = GetUriCookieContainer(uri, CookieData);

request.ContentType = "application/x-www-form-urlencoded";
request.Timeout = 30000;
request.Method = "POST";
request.ContentLength = byteArray.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(byteArray, 0, byteArray.Length);
requestStream.Close();
HttpWebResponse webResponse = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(webResponse.GetResponseStream(), Encoding.UTF8);
String sResult = reader.ReadToEnd();
reader.Close();
return sResult;
}
catch (Exception ex)
{
return "<error>" + ex.Message + "</error>";
}
}
2.post文件 (参考：http://www.cnblogs.com/greenerycn/archive/2010/05/15/csharp_http_post.html)
private string SendFile_wbr(string url, int timeOut, string fileKeyName, string filePath, NameValueCollection stringDict, string CookieData)
{

string responseContent;
var memStream = new MemoryStream();
var webRequest = (HttpWebRequest)WebRequest.Create(url);
//设置Cookie信息???
Uri uri = new Uri(url);
webRequest.CookieContainer = GetUriCookieContainer(uri, CookieData);
// 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(),
Encoding.GetEncoding("utf-8")))
{
responseContent = httpStreamReader.ReadToEnd();
}

fileStream.Close();
httpWebResponse.Close();
webRequest.Abort();

return responseContent;
}

C# HttpWebRequest和 webclient 的POST方法