添加项目文件。

2025-12-30 10:29:28 +08:00
parent 2989e660b3
commit 57cfd16e7b
21 changed files with 2348 additions and 0 deletions
@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Text.Json;
+using System.Threading.Tasks;
+using TodoList.Models;
+
+namespace TodoList.Services
+{
+    public class FileDataService : IDataService
+    {
+        private readonly string _filePath;
+
+        public FileDataService()
+        {
+            var appData = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
+            var folder = Path.Combine(appData, "TodoListApp");
+            Directory.CreateDirectory(folder);
+            _filePath = Path.Combine(folder, "tasks.json");
+        }
+
+        public async Task<List<TodoItem>> LoadTasksAsync()
+        {
+            if (!File.Exists(_filePath))
+            {
+                return new List<TodoItem>();
+            }
+
+            try
+            {
+                using var stream = File.OpenRead(_filePath);
+                var items = await JsonSerializer.DeserializeAsync<List<TodoItem>>(stream);
+                return items ?? new List<TodoItem>();
+            }
+            catch
+            {
+                return new List<TodoItem>();
+            }
+        }
+
+        public async Task SaveTaskAsync(TodoItem task)
+        {
+            var tasks = await LoadTasksAsync();
+            var existing = tasks.Find(t => t.Id == task.Id);
+            if (existing != null)
+            {
+                tasks.Remove(existing);
+            }
+            tasks.Add(task);
+            await SaveAllAsync(tasks);
+        }
+
+        public async Task SaveAllAsync(List<TodoItem> tasks)
+        {
+            using var stream = File.Create(_filePath);
+            await JsonSerializer.SerializeAsync(stream, tasks, new JsonSerializerOptions { WriteIndented = true });
+        }
+
+        public async Task DeleteTaskAsync(string id)
+        {
+            var tasks = await LoadTasksAsync();
+            var existing = tasks.Find(t => t.Id == id);
+            if (existing != null)
+            {
+                tasks.Remove(existing);
+                await SaveAllAsync(tasks);
+            }
+        }
+    }
+}