我的目标是使用我的应用程序共享数据,首选项等单独使用。希望它在我的整个应用程序中单独使用并希望它使用INotify在WPF中进行双向绑定。
我读到.net 4.5可以使用StaticPropertyChanged
所以我想知道下面我是如何实现它的,因为文档似乎不太明显。
public static class Global
{
public static event EventHandler<PropertyChangedEventArgs> StaticPropertyChanged;
private static void CallPropChanged(string Prop)
{
StaticPropertyChanged?.Invoke(Settings, new PropertyChangedEventArgs(Prop));
}
private static Store Settings = new Store();
public static int setting1
{
get { return Settings._setting1; }
set { if (value != Settings._setting1) { Settings._setting1 = value; CallPropChanged("setting1"); } }
}
}
internal sealed class Store
{
internal int _setting1;
}
我是否正确地想要完成我的目标?
编辑:做了一些修改:
public sealed class Global:INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
static readonly Global _instance = new Global();
private int _setting1;
private int _setting2;
private void CallPropChanged(string propertyName = null)
{
PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}
private bool SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
{
if (EqualityComparer<T>.Default.Equals(field, value)) return false;
field = value;
CallPropChanged(propertyName);
return true;
}
private Global() { }
public static int setting1
{
get { return _instance._setting1; }
set { _instance.SetField(ref _instance._setting1, value); }
}
public static int setting2
{
get { return _instance._setting2; }
set { _instance.SetField(ref _instance._setting2, value); }
}
}
答案 0 :(得分:0)
我不熟悉StaticPropertyChanged,但是我已经实现了像这样的单例视图模型:
public class MyViewModel : ViewModelBase
{
public static MyViewModel Instance { get; set; }
public static ICommand MyCommand { get; set; }
public MyViewModel()
{
Instance = this;
}
}
XAML中的和绑定按钮等,如下所示:
<Button Content="Click Me" Command="{x:Static vm:MyViewModel.MyCommand}" CommandParameter="MyParameters" />
您可以使用x:Static前缀绑定到静态字段,并且您可以正常使用INotifyPropertyChanged ...您可能会注意到此特定绑定实际上并不需要VM的单例实例,而是坚持使用单例模型,你也可以绑定到{x:Static vm:MyViewModel.Instance.Whatever}