100 lines
2.9 KiB
C#
100 lines
2.9 KiB
C#
using System.IO;
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using Newtonsoft.Json;
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using Prism.Mvvm;
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using Store.Management.Framework.Configs;
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namespace Store.Management.Framework.Services;
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public interface ISettingsServiceBase<T> where T : class
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{
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T Model { get; }
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string FilePath { get; }
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T GetDefaultModel();
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void LoadSettings();
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Task LoadSettingsAsync();
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void SaveSettings();
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Task SaveSettingsAsync();
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}
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/// <summary>
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/// JSON 配置服务。缺失文件保留当前配置，加载失败保留旧模型并抛出异常。
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/// 保存通过同目录临时文件替换目标；模型变更应在所属 UI 线程调用。
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/// </summary>
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public abstract class JsonSettingsServiceBase<T> : BindableBase, ISettingsServiceBase<T> where T : class
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{
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private readonly SemaphoreSlim _gate = new(1, 1);
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private T? _model;
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/// <summary>默认按模型类型名保存到用户配置目录，派生类可覆盖文件名或完整路径。</summary>
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public virtual string FilePath => FolderConfig.GetSettingsFilePath(typeof(T).Name + ".json");
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public abstract T GetDefaultModel();
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public T Model
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{
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get => _model ??= GetDefaultModel() ?? throw new InvalidOperationException("默认配置不能为空。");
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protected set
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{
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ArgumentNullException.ThrowIfNull(value);
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SetProperty(ref _model, value);
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}
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}
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public void LoadSettings()
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{
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T? loaded = LoadModelAsync().GetAwaiter().GetResult();
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if (loaded is not null) Model = loaded;
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}
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public void SaveSettings() => SaveSettingsAsync().GetAwaiter().GetResult();
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public async Task LoadSettingsAsync()
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{
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T? loaded = await LoadModelAsync();
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if (loaded is not null) Model = loaded;
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}
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private async Task<T?> LoadModelAsync()
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{
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T? loaded = null;
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await _gate.WaitAsync().ConfigureAwait(false);
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try
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{
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string path = GetFullPath();
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try
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{
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string json = await File.ReadAllTextAsync(path).ConfigureAwait(false);
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loaded = JsonConvert.DeserializeObject<T>(json)
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?? throw new JsonSerializationException($"配置文件不能为 null：{path}");
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}
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catch (FileNotFoundException) { }
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catch (DirectoryNotFoundException) { }
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}
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finally { _gate.Release(); }
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return loaded;
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}
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public async Task SaveSettingsAsync()
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{
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// 在首次等待前读取模型，避免在后台线程初始化默认模型。
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string json = JsonConvert.SerializeObject(Model, Formatting.Indented);
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await _gate.WaitAsync().ConfigureAwait(false);
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string? temporaryPath = null;
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try
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{
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string path = GetFullPath();
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Directory.CreateDirectory(Path.GetDirectoryName(path)!);
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temporaryPath = path + "." + Guid.NewGuid().ToString("N") + ".tmp";
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await File.WriteAllTextAsync(temporaryPath, json).ConfigureAwait(false);
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File.Move(temporaryPath, path, overwrite: true);
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}
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finally
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{
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try { if (temporaryPath is not null && File.Exists(temporaryPath)) File.Delete(temporaryPath); }
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finally { _gate.Release(); }
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}
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}
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private string GetFullPath()
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{
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ArgumentException.ThrowIfNullOrWhiteSpace(FilePath);
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return Path.GetFullPath(FilePath);
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}
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}
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