[开发测试]JSON格式 在winform下的实现-类的集合以JSON格式读写。

1.创建一个JSONHelper类。

 public class JSONHelper
    {
        /// <summary>
        /// 实体对象转换成JSON字符串
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="x"></param>
        /// <returns></returns>
        public static string EntityToJSON<T>(T x)
        {
            string result = string.Empty;

            try
            {
                result = JsonConvert.SerializeObject(x);
            }
            catch (Exception)
            {
                result = string.Empty;
            }
            return result;

        }

        /// <summary>
        /// JSON字符串转换成实体类
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="json"></param>
        /// <returns></returns>
        public static T JSONToEntity<T>(string json)
        {
            T t = default(T);
            try
            {
                t = (T)JsonConvert.DeserializeObject(json, typeof(T));
            }
            catch (Exception)
            {
                t = default(T);
            }

            return t;
        }

    }

2.创建实体类用于保存数据

 public  class Student
    {
        public int StudentId { get; set; }
        public string StudentName { get; set; }

    }

3.创建winform 通过集合条用Model 和 JSONHelper类

   private void btn_Save_Click(object sender, EventArgs e)
        {
            List<Student> stuList = new List<Student>()
            {
                new Student(){StudentId=1,StudentName="小明"},
                new Student(){StudentId=2,StudentName="小红"},
                new Student(){StudentId=3,StudentName="小丽"}
            };
          if (SaveConfig(JSONHelper.EntityToJSON(stuList), Application.StartupPath+"\\1.txt"))
            {
                MessageBox.Show("导出配置文件成功！", "导出配置");
            }
            else
            {
                MessageBox.Show("导出配置文件失败！", "导出配置");
            }
        }

        private bool SaveConfig(string info, string path)
        {
            FileStream fs;
            StreamWriter sw;
            try
            {
                //保存协议信息
                fs = new FileStream(path, FileMode.Create);
                sw = new StreamWriter(fs, Encoding.Default);
                sw.WriteLine(info);
                sw.Close();
                fs.Close();
            }
            catch (Exception)
            {
                return false;
            }
            return true;

        }
        private List<Student> ConfigList = new List<Student>();
        private void btn_Read_Click(object sender, EventArgs e)
        {

            using (OpenFileDialog fileDialog = new OpenFileDialog())
            {
                fileDialog.Multiselect = false;
                fileDialog.Filter = "Text文件|*.txt";
                if (fileDialog.ShowDialog() == DialogResult.OK)
                {
                    ConfigList = GetConfigInfo(fileDialog.FileName);
                    dataGridView1.DataSource = null;
                    dataGridView1.DataSource = ConfigList;
                }
            }
        }
        public List<Student> GetConfigInfo(string filename)
        {
            FileStream fs = new FileStream(filename, FileMode.Open);
            StreamReader sr = new StreamReader(fs, Encoding.Default);
            string str = sr.ReadToEnd();
            sr.Close();
            fs.Close();
            return JSONHelper.JSONToEntity<List<Student>>(str);
        }

4.结果

读取.

保存。

?

?注意：写入是把类以集合的形式序列化，读取是把字符串反序列化成为类。