这可能是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TextBlock,文本绑定到一个变量,变量发生了变化,但Text没有:
<TextBlock x:Name="modeLabel" Style="{StaticResource IndiTextBlock}" Height="23" TextWrapping="Wrap" Grid.Row="0" Text="{Binding ModeLabelText}" Margin="35,22,58,0"/>
控制文本值的代码位于viewmodel中:
public string ModeLabelText { get { return _modeLabeltext; } }
public ComboBoxItem SelectedMode { get { return _selectedMode; }
set
{
if (_selectedMode == value) return;
_selectedMode = value;
ToggleMode(null);
EvaluateScenario(null);
}
和
private void ToggleMode(object parameter)
{
if (_isBasicCalculation)
{
_modeLabeltext = "Target profit";
_isBasicCalculation = false;
}
else
{
_modeLabeltext = "Total to invest";
_isBasicCalculation = true;
}
}
答案 0 :(得分:2)
您的班级必须实施INotifyPropertyChanged
界面,并且在更改变量时,您应该触发事件
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");
}
}
答案 1 :(得分:0)
private void ToggleMode(object parameter)
{
if (_isBasicCalculation)
{
_modeLabeltext = "Target profit";
OnPropertyChanged("ModeLabelText");
_isBasicCalculation = false;
}
else
{
_modeLabeltext = "Total to invest";
OnPropertyChanged("ModeLabelText");
_isBasicCalculation = true;
}
}