C#发送Get、Post请求(带参数)

get请求

1.简单发送get请求

/// <summary>
/// 指定url地址使用get 方式获取全部字符串
/// </summary>
/// <param name="url">请求链接地址</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
    {
        //获取内容
        using (streamreader reader = new streamreader(stream))
        {
            result = reader.readtoend();
        }
    }
    finally
    {
        stream.close();
    }
    return result;
}

2.带请求参数的get方法

/// <summary>
/// 发送get请求
/// </summary>
/// <param name="url">地址</param>
/// <param name="dic">请求参数定义</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());
    //添加参数
    httpwebresponse resp = (httpwebresponse)req.getresponse();
    stream stream = resp.getresponsestream();
    try
    {
        //获取内容
        using (streamreader reader = new streamreader(stream))
        {
            result = reader.readtoend();
        }
    }
    finally
    {
        stream.close();
    }
    return result;
}

3.自定义指定http请求头，自定义指定编码解析返回结果

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，此处使用的编码是：gb2312
//using (streamreader reader = new streamreader(stream, encoding.default))
using (streamreader reader = new streamreader(stream, encoding.getencoding("gb2312")))
{
    result = reader.readtoend();
}

post请求

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

        /// <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,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 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

/// <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>
/// <param name="content">post提交数据内容(utf-8编码的)</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 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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