在Xamarin表单中保留AppsContext.Instance中的数据

public class AppsContext
{
    private static AppsContext _instance;
    private static readonly object _lock = new object();

    private Dictionary<string, object> _data = new Dictionary<string, object>();

    private AppsContext()
    {
        // 初始化数据
    }

    public static AppsContext Instance
    {
        get
        {
            lock (_lock)
            {
                if (_instance == null)
                {
                    _instance = new AppsContext();
                }
                return _instance;
            }
        }
    }

    public void SetValue(string key, object value)
    {
        lock (_lock)
        {
            _data[key] = value;
            // 持久化数据到本地存储
            SaveToLocalStorage();
        }
    }

    public T GetValue<T>(string key)
    {
        lock (_lock)
        {
            if (_data.TryGetValue(key, out var value))
            {
                return (T)value;
            }
            return default(T);
        }
    }

    private void SaveToLocalStorage()
    {
        // 实现将数据保存到本地存储的逻辑
    }

    private void LoadFromLocalStorage()
    {
        // 实现从本地存储加载数据的逻辑
    }
}