c# post和get請求

// <summary>
/// 發送http post請求
/// </summary>
/// <param name="url">地址</param>
/// <param name="parameters">查詢參數集合</param>
/// <returns></returns>
public string CreatePostHttpResponse(string url, IDictionary<string, string> parameters)
{
    HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;//創建請求對象
    request.Method = "POST";//請求方式
    request.ContentType = "application/x-www-form-urlencoded";//鏈接類型
    //構造查詢字符串
    if (!(parameters == null || parameters.Count == 0))
    {
        StringBuilder buffer = new StringBuilder();
        bool first = true;
        foreach (string key in parameters.Keys)
        {
 
            if (!first)
            {
                buffer.AppendFormat("&{0}={1}", key, parameters[key]);
            }
            else
            {
                buffer.AppendFormat("{0}={1}", key, parameters[key]);
                first = false;
            }
        }
        byte[] data = Encoding.UTF8.GetBytes(buffer.ToString());
        //寫入請求流
        using (Stream stream = request.GetRequestStream())
        {
            stream.Write(data, 0, data.Length);
        }
    }
    return GetResponseString((HttpWebResponse)request.GetResponse());

 }

/// <summary> /// 發送http Get請求 /// </summary> 
/// <param name="url"></param> 
/// <returns></returns> 
public string CreateGetHttpResponse(string url) 
{ 
　　HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; 
　　request.Method = "GET"; 
　　request.ContentType = "application/x-www-form-urlencoded";//鏈接類型 
　　return GetResponseString((HttpWebResponse)request.GetResponse()); 
} 

/// <summary> /// 從HttpWebResponse對象中提取響應的數據轉換為字符串 /// </summary> 
/// <param name="webresponse"></param> 
/// <returns></returns> 
public string GetResponseString(HttpWebResponse webresponse) 
{ 
　　using (Stream s = webresponse.GetResponseStream()) 
   { 
　　　　StreamReader reader = new StreamReader(s, Encoding.UTF8); return reader.ReadToEnd(); 
   } 
}