.net c# wpf Json读写以及修改保存 库文件为Newtonsoft.Json

使用的库文件为Newtonsoft.Json

读取JSON文件

 /// 

        /// 读取JSON文件
        /// 
        /// JSON文件中的key值
        /// JSON文件中的value值
        public JObject Readjson(string jsonfile)
        {
            using (System.IO.StreamReader file = System.IO.File.OpenText(jsonfile))
            {
                using (JsonTextReader reader = new JsonTextReader(file))
                {
                    JObject jObject = (JObject)JToken.ReadFrom(reader);
                    return jObject;
                }
            }
        }

写JSON文件

   public void Writejson(string jsonfile, JObject jObject)
        {
            using (System.IO.StreamWriter file = new System.IO.StreamWriter(jsonfile))
            {
                file.Write(jObject.ToString());
            }
        }

读JSON数组等，包括可能没有字段怎么处理

public ParameterItem ReadParameter()
        {
            try
            {
                JObject jObject = Readjson("a.json");
                JArray items = JArray.Parse(jObject["items"].ToString());
                foreach (var item in items)
                {
                    JObject itmeTemp = JObject.Parse(item.ToString());
                    if (uint.Parse(itmeTemp["channel"].ToString()) == channel)
                    {
                        ParameterItem parameterItem = new ParameterItem();
                        parameterItem.Channel = uint.Parse(itmeTemp["channel"].ToString());
                        parameterItem.Type = int.Parse(itmeTemp["type"].ToString());
                        parameterItem.Name = itmeTemp["name"].ToString();
                        if (itmeTemp.Property("maintenance") != null)
                        {
                            parameterItem.Maintenance = bool.Parse(itmeTemp["maintenance"].ToString()); ;
                        }
                        else
                        {
                            parameterItem.Maintenance = true;
                        }
                        return ParameterItem;
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("读取配置参数出现异常!"+ ex);
                return null;
            }
            return null;
        }

修改后写入

JObject jObject = Readjson("a.json");
                JToken items = jObject["items"];
                foreach (var item in items)
                {
                    for (int i = 0; i < newItem.Count; i++)
                    {
                        if (uint.Parse(item["channel"].ToString()) == newItem[i].Channel)
                        {
                            item["type"]  = newItem[i].Type;
                            item["oneToTwenty"] = newItem[i].OneToTwenty;
                            break;
                        }
                    }
                }
                Writejson("a.json", jObject);

JSON文件结构

{
	"count":2,
	"items": [
	{
		"channel": 0,
		"type":0,
		"name":"测试0通道",
	},
	{
		"channel": 1,
		"type":1,
		"name":"测试1通道",
	}]
}

举一反三可以实现很多功能