xiaomiMes/MainForm/ClassFile/DbHelper/JsonFileHelper.cs

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.IO;
using System.Text;

namespace MainForm.Common
{
    public class JsonFileHelper
    {
        /// <summary>
        /// 读取JSON文件
        /// </summary>
        /// <typeparam name="T">返回的类型</typeparam>
        /// <param name="fileName">打开的文件路径</param>
        /// <returns>实体类</returns>
        public static T ReadjsonT<T>(string fileName)
        {
            //using (System.IO.StreamReader file = System.IO.File.OpenText(System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase + fileName))
            using (System.IO.StreamReader file = System.IO.File.OpenText(fileName))
            {
                return JsonConvert.DeserializeObject<T>(file.ReadToEnd());
            }
        }
        //Config config = new Config();
        //config= JsonfileTools.ReadjsonT<Config>("SendDataZCCAconfig.json");

        /// <summary>
        /// 写入JSON文件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="fileName">保存使用的文件路径</param>
        /// <param name="tParameter">实体类</param>
        /// <returns>成功状态</returns>
        public static bool WritejsonT<T>(string fileName, T tParameter)
        {
            //string fp = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase + fileName;
            string fp = fileName;
            try
            {
                File.WriteAllText(fp, JsonConvert.SerializeObject(tParameter));  // 覆盖写入
                return true;
            }
            catch
            {
                return false;
            }
        }

        /// <summary>
        /// 修改-Value通过Key(AppSetting)
        /// </summary>
        /// <param name="filePath">文件路径</param>
        /// <param name="key">需要修改的key</param>
        /// <param name="value">更改为的值</param>
        /// <returns></returns>
        public static void ModifyValueByKey(string filePath, string[] key, string value)
        {
            try
            {
                if (!File.Exists(filePath))
                {
                    throw new Exception("需要修改的json文件不存在！");
                }
                string jsonStr = File.ReadAllText(filePath, Encoding.UTF8); // 读取文件流

                JObject json = JObject.Parse(jsonStr);  // 解析成json
                                                        //json[key] = value;  // 修改需要修改的字段
                switch (key.Length)
                {
                    case 1:
                        json[key[0]] = value;
                        break;
                    case 2:
                        json[key[0]][key[1]] = value;
                        break;
                    case 3:
                        json[key[0]][key[1]][key[2]] = value;
                        break;
                    default:
                        // 目前只用到最多三层的
                        break;
                }

                jsonStr = Convert.ToString(json);
                File.WriteAllText(filePath, jsonStr, Encoding.UTF8);
            }
            catch
            {
                throw new Exception($"修改{filePath}文件出错！");
            }
            
        }
    }
}