C# 调用api 并解析返回的json字符串

C# 调用api 并 解析返回的json字符串

1. 调用api

1. 首先需要引用 using System.IO; using System.Net;
2. 编写请求api函数，下面是发送 GET 请求函数。

        //请求api
        public static string ApiGet(string url)
        {
            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "GET";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/json";

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }

3. 发送POST请求的函数。

        public static string ApiPost(string url, string body)
        {
            Encoding encoding = Encoding.UTF8;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Method = "POST";
            request.Accept = "text/html, application/xhtml+xml, */*";
            request.ContentType = "application/json";

            byte[] buffer = encoding.GetBytes(body);
            request.ContentLength = buffer.Length;
            request.GetRequestStream().Write(buffer, 0, buffer.Length);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                return reader.ReadToEnd();
            }
        }

4. 以GET方式，请求api。如果需要传值，在url中添加即可。
   例如：发送请求携带传用户名和密码 ：“http://127.0.0.1:8000/detail/test?userName=123&password=123”

        static void Main(string[] args)
        {
            string jsonStr = ApiGet("http://127.0.0.1:8000/detail/test");
        }

5. 以POST方式，请求api。携带json格式的用户名和密码。

        static void Main(string[] args)
        {
            string jsonStr = ApiPost("http://127.0.0.1:8000/detail/test", "{userName:\"123\",password:\"123\"}");
        }

2. 解析json字符串

1. 首先需要在解决方案中.右击 引用 添加引用，选择 System.Web.Extensions，确定。

2. 引用命名空间 using System.Web.Script.Serialization;
3. 编写接收的Json串的属性。例如接收的Json串是{“code”: 200,“message”:“get”}，需要为键创建属性。

        public class Test
        {
            public int code { get; set; }
            public string message { get; set; }
        }

4. 解析Json串。

        static void Main(string[] args)
        {
            //请求api
            string jsonStr = ApiGet("http://127.0.0.1:8000/detail/test");
            
            //解析Json串
            JavaScriptSerializer js = new JavaScriptSerializer();
            var model = js.Deserialize<Test>(jsonStr);

            //输出值
            Console.WriteLine(model.code);
            Console.WriteLine(model.message);
        }

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