Databound StatusBarItem TextBlock不更新

Question

我已經設置了自己的StatusObject類來更新狀態欄。雖然在調試時似乎都會更新，但StatusBar不顯示任何文本。我感覺有些東西顯然很痛苦，但我不知道是什麼。數據綁定看起來不錯，但不確定。任何人都能發現任何東西嗎

查看

<Window x:Class="WpfApp3.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:local="clr-namespace:WpfApp3" 
     mc:Ignorable="d" 
     Title="MainWindow" Height="350" Width="525"> 
    <Grid> 
     <Grid Margin="13,167,-29,156" x:Name="StatusGrid" DataContext="{Binding}"> 

      <StatusBar x:Name="StatusBar" HorizontalAlignment="Left" Height="45" VerticalAlignment="Top" Width="497" Margin="0,0,0,-45" > 
       <StatusBarItem Width="171"> 
       <TextBlock Text="{Binding Status, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Width="161" Height="37"/> 
       </StatusBarItem> 
    <Separator/> 
       <StatusBarItem> 
       <TextBlock Text="{Binding ActiveJoist, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" Width="314" Height="38"/> 
       </StatusBarItem> 
      </StatusBar> 

    </Grid> 
<Button Content="Button" HorizontalAlignment="Left" Margin="13,219,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/> 

    </Grid> 
</Window> 

代碼隱藏

using System.Collections.ObjectModel; 
using System.ComponentModel; 
using System.Runtime.CompilerServices; 
using System.Windows; 
namespace WpfApp3 
{ 
public partial class MainWindow : Window 
    { 

    public class StatusObject : INotifyPropertyChanged 
    { 
     public ObservableCollection<string> Log { get; set; } 
     public string Status { get; set; } 
     public string ActiveJoist { get; set; } 

     public event PropertyChangedEventHandler PropertyChanged; 

     protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) 
     { 
      PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); 
     } 
    } 
    public StatusObject statusObject = new StatusObject(); 

    public MainWindow() 
    { 
     InitializeComponent(); 
     StatusGrid.DataContext = statusObject; 

    } 

    private void Button_Click(object sender, RoutedEventArgs e) 
    { 
     Create(); 
    } 

    public void Create() 
    { 
     statusObject.Status = "test string"; 
     statusObject.ActiveJoist = "test string 2"; 
    } 
    } 
} 

編輯：不知道它的問題，但我有綁定到多個DataGrid中我查看多個DataContexts，在大約相同的確切的時尚，沒有問題。

Answer 1

問題出在我的班上，並沒有明確地打電話給OnPropertyChanged。我將屬性更改爲具有支持字段並明確稱爲OnPropertyChanged。這是更新的類。不過，我不知道爲什麼會這樣。我有其他類沒有明確地調用OnPropertyChanged，但他們仍然綁定和更新完美。如果有人知道，我很樂意聽到解釋。

public class StatusObject : INotifyPropertyChanged 
{ 
    public ObservableCollection<string> Log { get; set; } 

    private string _status; 
    public string Status 
    { 
     get => _status; 
     set 
     { 
      _status = value; 
      OnPropertyChanged(nameof(Status)); 
     } 
    } 

    private string _activeJoist; 
    public string ActiveJoist 
    { 
     get => _activeJoist; 
     set 
     { 
      _activeJoist = value; 
      OnPropertyChanged(nameof(ActiveJoist)); 
     } 
    } 

    public event PropertyChangedEventHandler PropertyChanged; 

    [NotifyPropertyChangedInvocator] 
    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null) 
    { 
     PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); 
    } 
}