C# 实现http不同方法的请求

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C#  实现http不同方法的请求

1、不带参数的POST请求

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、带参数的POST请求

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 = ;
    foreach (var item in dic)
    {
        if (i > )
            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, , 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、不带参数的GET请求

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;
}  

4、带参数的GET请求

public static string Get(string url, Dictionary<string, string> dic)
{
    string result = "";
    StringBuilder builder = new StringBuilder();
    builder.Append(url);
    if (dic.Count > )
    {
        builder.Append("?");
        int i = ;
        foreach (var item in dic)
        {
            if (i > )
                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;
}  

5、自定义HTTP请求头

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();
}  

参考：https://blog.****.net/u011127019/article/details/53021164