C#發(fā)送Get、Post請求(帶參數(shù))

更新時間：2021年09月10日 16:13:56 作者：天馬3798

本文主要介紹了C#發(fā)送Get、Post請求，文中通過示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下

Get請求

1.簡單發(fā)送Get請求

/// <summary>
/// 指定Url地址使用Get 方式獲取全部字符串
/// </summary>
/// <param name="url">請求鏈接地址</param>
/// <returns></returns>
public static string Get(string url)
{
    string result = "";
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
    Stream stream = resp.GetResponseStream();
    try
    {
        //獲取內容
        using (StreamReader reader = new StreamReader(stream))
        {
            result = reader.ReadToEnd();
        }
    }
    finally
    {
        stream.Close();
    }
    return result;
}

2.帶請求參數(shù)的Get方法

/// <summary>
/// 發(fā)送Get請求
/// </summary>
/// <param name="url">地址</param>
/// <param name="dic">請求參數(shù)定義</param>
/// <returns></returns>
public static string Get(string url, Dictionary<string, string> dic)
{
    string result = "";
    StringBuilder builder = new StringBuilder();
    builder.Append(url);
    if (dic.Count > 0)
    {
        builder.Append("?");
        int i = 0;
        foreach (var item in dic)
        {
            if (i > 0)
                builder.Append("&");
            builder.AppendFormat("{0}={1}", item.Key, item.Value);
            i++;
        }
    }
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(builder.ToString());
    //添加參數(shù)
    HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
    Stream stream = resp.GetResponseStream();
    try
    {
        //獲取內容
        using (StreamReader reader = new StreamReader(stream))
        {
            result = reader.ReadToEnd();
        }
    }
    finally
    {
        stream.Close();
    }
    return result;
}

3.自定義指定Http請求頭，自定義指定編碼解析返回結果

HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
req.Method = "GET";
req.Headers["Accept-Language"] = "zh-CN,zh;q=0.8";
req.Referer = "https://www.baidu.com/";
HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
Stream stream = resp.GetResponseStream();
string result = "";
//注意，此處使用的編碼是：gb2312
//using (StreamReader reader = new StreamReader(stream, Encoding.Default))
using (StreamReader reader = new StreamReader(stream, Encoding.GetEncoding("gb2312")))
{
    result = reader.ReadToEnd();
}

Post請求

此處內容傳輸都是用UTF-8編碼

1.不帶參數(shù)發(fā)送Post請求

        /// <summary>
        /// 指定Post地址使用Get 方式獲取全部字符串
        /// </summary>
        /// <param name="url">請求后臺地址</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();
            //獲取內容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }

2.帶參數(shù)Post請求,指定鍵值對

        /// <summary>
        /// 指定Post地址使用Get 方式獲取全部字符串
        /// </summary>
        /// <param name="url">請求后臺地址</param>
        /// <returns></returns>
        public static string Post(string url,Dictionary<string,string> dic)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            #region 添加Post 參數(shù)
            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();
            //獲取響應內容
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }

3.帶參數(shù)的Post請求，指定發(fā)送字符串內容

/// <summary>
/// 指定Post地址使用Get 方式獲取全部字符串
/// </summary>
/// <param name="url">請求后臺地址</param>
/// <param name="content">Post提交數(shù)據(jù)內容(utf-8編碼的)</param>
/// <returns></returns>
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 參數(shù)
    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();
    //獲取響應內容
    using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
    {
        result = reader.ReadToEnd();
    }
    return result;
}

轉載方法：

 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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