C# Json文件写入、读取 | Json文件序列化、反序列化

 Json写入（序列化）

using System.IO;
using System.Text;

/// <summary>
/// 对象转换为json字符串
/// </summary>
/// <param name="obj">需要转换的对象</param>
/// <returns></returns>
public string ObjectToJson(object obj)
{
    var strJson = "";
    DataContractJsonSerializer json = new DataContractJsonSerializer(obj.GetType());
    //序列化
    using (MemoryStream stream = new())
    {
        json.WriteObject(stream, obj);
        strJson = Encoding.UTF8.GetString(stream.ToArray());
    }
    return strJson;
}

/// <summary>
/// 将序列化的json字符串内容写入json文件
/// </summary>
/// <param name="path">路径</param>
/// <param name="jsonConents">Json内容</param>
private void WriteJsonFile(string path, string jsonConents)
{
    File.WriteAllText(path, jsonConents, Encoding.UTF8);
}

使用：

public class Student
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Sex { get; set; }
}

//需要写入Json文件中的数据集合
List<Student> students = new List<Student>();
students.Add(new Student { Id = 1 ,Name="111",Sex="男"});
students.Add(new Student { Id = 2 ,Name="222",Sex="男"});
students.Add(new Student { Id = 3 ,Name="333",Sex="女"});
students.Add(new Student { Id = 4 ,Name="444",Sex="男"});
students.Add(new Student { Id = 5 ,Name="555",Sex="男"});

//转为Json字符串
string text = ObjectToJson(students);//调用写入方法
WriteJsonFile(@"D:\Desktop\test.json", text);

 

 Json文件读取（反序列化）

添加“ Newtonsoft.Json ”程序安装包

/// <summary>
/// 反序列化
/// </summary>
/// <param name="filePath">文件路径</param>
/// <returns></returns>
private List<T> JsonToList<T>(string filePath)
{
    string jsonStr = File.ReadAllText(filePath);

    //反序列化
    var list = new List<T>(JsonConvert.DeserializeObject<List<T>>(jsonStr));

    return list;
}

 使用：

var stu = JsonToList<Student>(@"D:\Desktop\test.json");