73 lines
1.8 KiB
C#
73 lines
1.8 KiB
C#
using Cowain.Base.Models;
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using Cowain.Base.ViewModels;
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using System.ComponentModel;
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using System.Reflection;
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using System.Runtime.CompilerServices;
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namespace Cowain.Base.Helpers;
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public class GlobalData : INotifyPropertyChanged
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{
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public event PropertyChangedEventHandler? PropertyChanged;
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public void RaisePropertyChanged([CallerMemberName] string? propertyName = null)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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private static GlobalData? _instance;
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private static readonly object _lock = new object();
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private GlobalData()
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{
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}
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public static GlobalData Instance
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{
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get
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{
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if (_instance == null)
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{
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lock (_lock)
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{
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if (_instance == null)
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{
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_instance = new GlobalData();
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}
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}
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}
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return _instance;
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}
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}
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private IDictionary<string, object> _activeDictionary = new Dictionary<string, object>();
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public LoginUserViewModel? CurrentUser { get; set; }
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public void AddOrUpdate(string key, object? value)
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{
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if (value is null)
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{
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return;
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}
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if (_activeDictionary.ContainsKey(key))
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{
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_activeDictionary[key] = value;
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//字典中的值发生变化时，触发PropertyChanged事件
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RaisePropertyChanged("Item");
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}
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else
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{
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_activeDictionary.Add(key, value);
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// 添加新键时通知整个索引器
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RaisePropertyChanged("Item[]");
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}
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}
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public object? this[string key]
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{
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get
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{
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return _activeDictionary.TryGetValue(key, out var value) ? value : null;
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}
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}
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}
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