C# 发送Post请求(带参数)

此处内容传输都是用UTF-8编码

1.不带参数发送Post请求

    /// <summary>
    /// 指定Post地址使用Get 方式获取全部字符串
    /// </summary>
    /// <param name="url">请求后台地址</param>
    /// <returns></returns>
    public static string Post(string url)
    {
        string result = "";
        HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
        req.Method = "POST";
        HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
        Stream stream = resp.GetResponseStream();
        //获取内容
        using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
        {
            result = reader.ReadToEnd();
        }
        return result;
    }

2.带参数Post请求,指定键值对

/// /// 指定Post地址使用Get 方式获取全部字符串 ///
/// 请求后台地址
///
public static string Post(string url,Dictionary dic)
{
string result = "";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
#region 添加Post 参数
StringBuilder builder = new StringBuilder();
int i = 0;
foreach (var item in dic)
{
if (i > 0)
builder.Append("&");
builder.AppendFormat("{0}={1}", item.Key, item.Value);
i++;
}
byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
req.ContentLength = data.Length;
using (Stream reqStream = req.GetRequestStream())
{
reqStream.Write(data, 0, data.Length);
reqStream.Close();
}
#endregion
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
Stream stream = resp.GetResponseStream();
//获取响应内容
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
result = reader.ReadToEnd();
}
return result;
}


3.带参数的Post请求,指定发送字符串内容

/// /// 指定Post地址使用Get 方式获取全部字符串 ///
/// 请求后台地址
/// Post提交数据内容(utf-8编码的)
///
public static string Post(string url, string content)
{
string result = "";
HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
#region 添加Post 参数
byte[] data = Encoding.UTF8.GetBytes(content);
req.ContentLength = data.Length;
using (Stream reqStream = req.GetRequestStream())
{
    reqStream.Write(data, 0, data.Length);
    reqStream.Close();
}
#endregion

HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
Stream stream = resp.GetResponseStream();
//获取响应内容
using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
{
    result = reader.ReadToEnd();
}
return result;
}


转载方法:

HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create("http://fanyi.baidu.com/transcontent");
Encoding encoding = Encoding.UTF8;
string param = "ie=utf-8&source=txt&query=hello&t=1327829764203&token=8a7dcbacb3ed72cad9f3fb079809a127&from=auto&to=auto";
//encoding.GetBytes(postData);
byte[] bs = Encoding.ASCII.GetBytes(param);
string responseData = String.Empty;
req.Method = "POST";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = bs.Length;
using (Stream reqStream = req.GetRequestStream())
{
reqStream.Write(bs, 0, bs.Length);
reqStream.Close();
}
using (HttpWebResponse response = (HttpWebResponse)req.GetResponse())
{
using (StreamReader reader = new StreamReader(response.GetResponseStream(),encoding))
{
responseData = reader.ReadToEnd().ToString();
}
context.Response.Write(responseData);
}

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