c#后台读取和写入json格式数据

http拿取json

//url json网络地址
 public class HttpUitls
    {
         public static string Get(string Url)
        {
            //System.GC.Collect();
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.Proxy = null;
            request.KeepAlive = false;
            request.Method = "GET";
            request.ContentType = "application/json; charset=UTF-8";
            request.AutomaticDecompression = DecompressionMethods.GZip;

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();
            myResponseStream.Close();

            if (response != null)
            {
                response.Close();
            }
            if (request != null)
            {
                request.Abort();
            }

            return retString;
        }

        public static string Post(string Url, string Data, string Referer)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.Method = "POST";
            request.Referer = Referer;
            byte[] bytes = Encoding.UTF8.GetBytes(Data);
            request.ContentType = "application/x-www-form-urlencoded";
            request.ContentLength = bytes.Length;
            Stream myResponseStream = request.GetRequestStream();
            myResponseStream.Write(bytes, 0, bytes.Length);

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            StreamReader myStreamReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
            string retString = myStreamReader.ReadToEnd();

            myStreamReader.Close();
            myResponseStream.Close();

            if (response != null)
            {
                response.Close();
            }
            if (request != null)
            {
                request.Abort();
            }
            return retString;
        }
    
}

Newtonsoft.Json引用 json读取

//将接口传入，这个HttpUitls的类，有兴趣可以研究下，也可以直接用就可以，不用管如何实现。
string getJson = HttpUitls.Get(url);

//这个需要引入Newtonsoft.Json这个DLL并using
//传入我们的实体类还有需要解析的JSON字符串这样就OK了。然后就可以通过实体类使用数据了。
Root rt = JsonConvert.DeserializeObject(getJson);
//这样就可以取出json数据里面的值
MessageBox.Show("com=" + rt.com + "
" + "condition=" + rt.condition + "
" + "ischeck=" + rt.ischeck + "
" + "state=" + rt.state + "
" + "status=" + rt.status);
//由于这个JSON字符串的 public List data 是一个集合，所以我们需要遍历集合里面的所有数据
for (int i = 0; i < rt.data.Count; i++)
{
MessageBox.Show("Data=" + rt.data[i].context + "
" + rt.data[i].location + "
" + rt.data[i].time + "
" + rt.data[i].ftime);
}

List转json格式写入

/**
* code 状态描述
* msg  返回信息
* count 总数
* list  数据
* */
public static string getJson(int code, string msg, int count, List list)
 {
            StringBuilder sb = new StringBuilder();
            sb.Append("{");

            sb.Append(""code":" + code);
            sb.Append(","message":"" + msg + """);
            sb.Append(","count":" + count);
            sb.Append(","detail":");
            try
            {
                MemoryStream stream1 = new MemoryStream();
                DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(List));
                ser.WriteObject(stream1, list);
                stream1.Position = 0;
                StreamReader sr = new StreamReader(stream1);
                sb.Append(sr.ReadToEnd());
            }
            catch (Exception e)
            {
                sb.Append("[{}]");
            }
            sb.Append("}");

            return sb.ToString();
}