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JSON task manager

Load and save tasks using JSON files.

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All C# source files below are loaded together in the playground. Files written by a run live in its virtual directory.

Program.cs

using System.Text.Json;

var tasks = new List<TaskItem>
{
    new("Write the README", true),
    new("Add unit tests", false),
    new("Ship to TestFlight", false),
};

File.WriteAllText("tasks.json", JsonSerializer.Serialize(tasks));

var saved = File.ReadAllText("tasks.json");
var loaded = JsonSerializer.Deserialize<List<TaskItem>>(saved) ?? new List<TaskItem>();

foreach (var task in loaded)
{
    Console.WriteLine($"[{(task.Done ? "x" : " ")}] {task.Title}");
}
Console.WriteLine($"{loaded.Count(t => !t.Done)} of {loaded.Count} left");

Models/TaskItem.cs

public sealed record TaskItem(string Title, bool Done);

TaskManager.csproj

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net10.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <AssemblyName>TaskManager</AssemblyName>
  </PropertyGroup>
</Project>