问题从不同的类访问属性... UI未更新[MVVM] [英] Problem Accessing Property from different class... UI is not Updating [MVVM]

问题描述

问题从不同的类访问属性...

Problem Accessing Property from different class...

UI不是更新[MVVM]

UI is not Updating [MVVM]

1。我试图从不同的类访问IsEnabled属性。 （MVVM）

1. I am Trying to Access IsEnabled Property from Different Class. (MVVM)

public class FirstScreeenViewModel : INotifyPropertyChanged
{

 TwoClassInteraction _sc = new TwoClassInteraction();
  public FirstScreeenViewModel()
{
 ControlEnabled = _sc.ControlEnabled;
}
 private bool _controlEnabled;

  public bool ControlEnabled
        {
            get => _controlEnabled;
            set
            {
                _controlEnabled = value;
                Selectedhandbuger = false;
                OnPropertyChanged(nameof(ControlEnabled));
            }
        }

}

  public class TwoClassInteraction : Basepropertychangedevent
    {
        private bool _controlEnabledproperty;
        public bool ControlEnabled
        {
            get => _controlEnabledproperty;
            set
            {
                if (_controlEnabledproperty == value) return;
                _controlEnabledproperty = value;

                OnPropertyChanged("ControlEnabled");
            }
        }
    }

Now I am Accessing from Third Class

  public class ThirdClassInteraction : Basepropertychangedevent
    {
public void Test()
{

var mm = new TwoClassInteraction();
mm.ControlEnabled = false;
}

}

但是UI未更新......  IsEnabled =" {Binding ControlEnabled}"

But UI is Not Updating...... IsEnabled="{Binding ControlEnabled}"

我的要求很简单..

更改属性值来自多个班级和用户界面应该被反映 

推荐答案

尝试使用Singleton以及不工作的UI不更新

Tried Singleton As well Not Working UI not Updating

 public class TwoClassInteraction : Basepropertychangedevent
    {
        public TwoClassInteraction()
        {
            ControlEnabled = true;
        }
        private static volatile TwoClassInteraction _instance;
        private static readonly object SyncRoot = new object();

        public static TwoClassInteraction InstanceTwoClassInteraction
        {
            get
            {
                if (_instance != null) return _instance;
                lock (SyncRoot)
                {
                    if (_instance == null)
                        _instance = new TwoClassInteraction();
                }

                return _instance;
            }
        }


        private bool _controlEnabledproperty;
        public bool ControlEnabled
        {
            get => _controlEnabledproperty;
            set
            {
                
                _controlEnabledproperty = value;

                OnPropertyChanged("ControlEnabled");
            }
        }
    }

public void Test()
{

TwoClassInteraction.InstanceTwoClassInteraction.ControlEnabled = false;
}

IsEnabled="{Binding ControlEnabled}"

不是他们工作..

我的要求很简单..

更改多个类和UI的属性值应该被反映 

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