SignalRChatForWebApi/ChatCommon/JsonHelper.cs

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using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;

namespace ChatCommon
{
    /// <summary>
    /// json帮助类
    /// </summary>
    public class JsonHelper
    {
        /// <summary>
        /// 把对象序列化json字符串
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static string ToJsonString(object obj)
        {
            return JsonConvert.SerializeObject(obj);
        }
        /// <summary>
        /// 把json字符串转成对象
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="jsonString"></param>
        /// <returns></returns>
        public static T ToJsonObject<T>(string jsonString)
        {
            return JsonConvert.DeserializeObject<T>(jsonString);
        }
        /// <summary>
        /// List转成json 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="jsonName"></param>
        /// <param name="list"></param>
        /// <returns></returns>
        public static string ListToJson<T>(IList<T> list, string jsonName)
        {
            StringBuilder Json = new StringBuilder();
            if (string.IsNullOrEmpty(jsonName))
                jsonName = list[0].GetType().Name;
            Json.Append("{\"" + jsonName + "\":[");
            if (list.Count > 0)
            {
                for (int i = 0; i < list.Count; i++)
                {
                    T obj = Activator.CreateInstance<T>();
                    PropertyInfo[] pi = obj.GetType().GetProperties();
                    Json.Append("{");
                    for (int j = 0; j < pi.Length; j++)
                    {
                        Type type;
                        object o = pi[j].GetValue(list[i], null);
                        string v = string.Empty;
                        if (o != null)