當代碼隱藏值更改時，用戶控件未更新

Question

我有一個在運行時更新的viewmodel類。但是，如果視圖模型中的值在運行時的代碼隱藏中發生更改，則視圖不會更新。我哪裏做錯了？

視圖模型看起來是這樣的：

public class vmA : modelA, INotifyPropertyChanged 
{ 
    public event PropertyChangedEventHandler PropertyChanged; 

    private void OnPropertyChanged(PropertyChangedEventArgs propertyChangedEventArgs) 
    { 
     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyChangedEventArgs.PropertyName)); 
    } 

    public vmA() 
    { 
     SomeValue = 254.43F; //This value is shown when the control is loaded 
    } 

    public void SetSomeValue(int _someValue) 
    { 
     SomeValue = _someValue; // If this is executed, the view still shows 254.43, even though _someValue contains a different value 
    } 
} 

（這是由視圖模型繼承）模型類看起來像這樣

public class modelA : INotifyPropertyChanged 
{ 
    public event PropertyChangedEventHandler PropertyChanged; 

    public void OnPropertyChanged(PropertyChangedEventArgs propertyChangedEventArgs) 
    { 
     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyChangedEventArgs.PropertyName)); 
    } 

    private int someValue 

    public int SomeValue 
    { 
     get { return someValue 
     set { someValue value; OnPropertyChanged(new PropertyChangedEventArgs("SomeValue")); }     
    } 
} 

綁定是這樣

<UserControl.DataContext> 
    <vm:vmA></vm:vmA> 
</UserControl.DataContext> 

完成

該文本框綁定：

<TextBox x:Name="tbBetragNetto" Text='{Binding BetragNetto, Mode=TwoWay}' Grid.Column="0"/> 

Answer 1

因爲你有2 INotifyPropertyChanged的實現。綁定與你想要聽的事件混淆。將您的視圖模型縮小至此：

public class vmA : modelA 
{ 
    public vmA() 
    { 
     SomeValue = 254.43F; //This value is shown when the control is loaded 
    } 

    public void SetSomeValue(int _someValue) 
    { 
     SomeValue = _someValue; // If this is executed, the view still shows 254.43, even though _someValue contains a different value 
    } 
}