C# 读写Json格式配置文件信息

相关视频教程 https://www.bilibili.com/video/BV1av411n74E（如果不会请看我录制的视频教程）
这里对Josn解析，用的是Newtonsoft.Json，以下是核心代码

public class JosnConfigHelper
{
    private static Dictionary<string, string> configDic = new Dictionary<string, string>();
    /// <summary>
    /// 读取配置信息
    /// </summary>
    /// <param name="key"></param>
    /// <returns></returns>
    public static string ReadConfig(string key)
    {
        if (File.Exists("config.json") == false)//如果不存在就创建file文件夹
        {
            FileStream f = File.Create("config.json");
            f.Close();
        }
        string s = File.ReadAllText("config.json");
        try
        {
            configDic = JsonConvert.DeserializeObject<Dictionary<string, string>>(s);
        }
        catch
        {
            configDic = new Dictionary<string, string>();
        }

        if (configDic != null && configDic.ContainsKey(key))
        {
            return configDic[key];
        }
        else
        {
            return string.Empty;
        }
    }
    /// <summary>
    /// 添加配置信息
    /// </summary>
    /// <param name="key"></param>
    /// <param name="value"></param>
    public static void WriteConfig(string key, string value)
    {
        if (configDic == null)
        {
            configDic = new Dictionary<string, string>();
        }
        configDic[key] = value;
        string s = JsonConvert.SerializeObject(configDic);
        File.WriteAllText("config.json", s);
    }
    /// <summary>
    /// 删除配置信息
    /// </summary>
    /// <param name="key"></param>
    public static void DeleteConfig(string key)
    {
        if (configDic != null && configDic.ContainsKey(key))
        {
            configDic.Remove(key);
            string s = JsonConvert.SerializeObject(configDic);
            File.WriteAllText("config.json", s);
        }
    }
}