how to inset a new jsondata in a text file

Question

i am working with uwp

try

        {  

            var path = @"text file\\GetAllEmp.txt";  
              

            string rawJson = File.ReadAllText(path, Encoding.UTF8);  

            ObservableCollection<EmployeeItem> Employee = new ObservableCollection<EmployeeItem>();  
            var jsonData = JsonConvert.SerializeObject(rawJson);  

            List<EmployeeItem> emp = JsonConvert.DeserializeObject<List<EmployeeItem>>(rawJson);  

            listitem.ItemsSource = emp;  

}

i need to insert a data Without deleting the existing data i have uploaded the file in solution explore

my text file contains
[
{
"Id": 5,
"GID": 1,
"SID": 34
},
{
"Id": 4,
"GID": 1,
"SID": 33
},
{
"Id": 3,
"GID": 1,
"SID": 32
}
]

public class EmployeeItem  
{  
  
[JsonProperty("Id")]  
public int Id { get; set; }  
  
[JsonProperty("GID")]  
public long GroupID { get; set; }  
  
[JsonProperty("SID")]  
public long SiteID { get; set; }  
}  

i have read my text file i just need to add a new data

i have given my text file in solution expolore

is there is any other method please let me know

Answer 1

Here is a simple example which I use Bogus library to mock-up data. The code was done in a console project but will work with any project type.

Model

public class Person  
{  
    public int Id { get; set; }  
    public string FirstName { get; set; }  
    public string LastName { get; set; }  
    public DateTime BirthDate { get; set; }  
  
    public Person(int identifier)  
    {  
        Id = identifier;  
    }  
  
    public Person() { }  
  
    public string Details => $"{Id,-4}{FirstName} {LastName} {BirthDate:d}";  
}  

Create some data

public class BogusOperations  
{  
    public static List<Person> People(int count = 10)  
    {  
        int identifier = 1;  
  
        Faker<Person> fakePerson = new Faker<Person>()  
                .CustomInstantiator(f => new Person(identifier++))  
                .RuleFor(p => p.FirstName, f => f.Person.FirstName)  
                .RuleFor(p => p.LastName, f => f.Person.LastName)  
                .RuleFor(p => p.BirthDate, f => f.Date.Past(10))  
            ;  
  
  
        return fakePerson.Generate(count);  
  
    }  
}  

Read/write operations

public class Operations  
{  
    private static string FileName => "People.json";  
    public static JsonSerializerOptions Indented  
        => new() { WriteIndented = true };  
    public static List<Person> Read()  
    {  
        var list = JsonSerializer.Deserialize<List<Person>>(File.ReadAllText(FileName));  
  
        return list;  
    }  
    public static void Save(List<Person> list)  
    {  
        File.WriteAllText(FileName, JsonSerializer.Serialize(list, Indented));  
    }  
}  

Run it

Operations.Save(BogusOperations.People(2));  
var people = Operations.Read();  
foreach (var person in people)  
{  
    Console.WriteLine(person.Details);  
}  
  
people.Add(new Person()  
{  
    Id = 3,   
    FirstName = "Jim",   
    LastName = "Smith",   
    BirthDate = new DateTime(1990,1,1)  
});  
Operations.Save(people);  
Console.WriteLine();  
  
people = Operations.Read();  
foreach (var person in people)  
{  
    Console.WriteLine(person.Details);  
}