C# 为什么我的XAML不响应变量中的更改

可能有一个非常简单的原因，为什么这不起作用，但我已经尝试了一切。我有一个文本块，其中文本绑定到一个变量，变量会更改，但文本不会：

 <TextBlock x:Name="modeLabel" Style="{StaticResource IndiTextBlock}"  Height="23" TextWrapping="Wrap" Grid.Row="0" Text="{Binding ModeLabelText}" Margin="35,22,58,0"/>

及

多谢各位

---

您的类必须实现该接口，并且在变量发生更改时，您应该触发该事件

public class Model : INotifyPropertyChanged
{
    public event EventHandler PropertyChanged; // event from INotifyPropertyChanged

    protected void RaisePropertyChanged(string propertyName)
    {
        var local = PropertyChanged;
        if (local != null)
        {
            local.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public void ToggleMode()
    {
        // ... your code ...
        RaisePropertyChanged("ModelLabelText");
    }
}

---

您已经为它设置了数据上下文，并实现了InotifyPropertyChanged自从它在if的两个分支中都发生了更改后，就可以安全地将OnPropertyChanged方法调用放在if后面：）

private void ToggleMode(object parameter)
{
    if (_isBasicCalculation)
    {
        _modeLabeltext = "Target profit";
        _isBasicCalculation = false;
    }
    else
    {
        _modeLabeltext = "Total to invest";
        _isBasicCalculation = true;
    }
}

    private void ToggleMode(object parameter)
    {
        if (_isBasicCalculation)
        {
            _modeLabeltext = "Target profit";
            OnPropertyChanged("ModeLabelText");
            _isBasicCalculation = false;

        }
        else
        {
            _modeLabeltext = "Total to invest";
            OnPropertyChanged("ModeLabelText");
            _isBasicCalculation = true;
        }

    }

public class Model : INotifyPropertyChanged
{
    public event EventHandler PropertyChanged; // event from INotifyPropertyChanged

    protected void RaisePropertyChanged(string propertyName)
    {
        var local = PropertyChanged;
        if (local != null)
        {
            local.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public void ToggleMode()
    {
        // ... your code ...
        RaisePropertyChanged("ModelLabelText");
    }
}