[英]Updating textbox from Button click C#
I have the following textbox 我有以下文本框
<TextBox Grid.Column="1"
Grid.Row="1"
Name="groupAddressBox"
Width ="80"
Text="{Binding Path=GroupAddress, Converter={StaticResource groupAddressConverter}}"/>
When I change the text manually, it's all good. 当我手动更改文本时,一切都很好。
But when I try to do this via a button 但是当我尝试通过按钮执行此操作时
private void Test_Click(object sender, RoutedEventArgs e)
{
groupAddressBox.Text = "0/0/1";
}
Although the text changes, the source is not updated, and when I click on ok, it recognizes the value that was there before the change. 尽管文本更改了,但是源没有更新,当我单击“确定”时,它会识别出更改之前的值。 I cannot upgrade the source straight away, so I prefer to do this this way.
我无法立即升级源,因此我更喜欢这样做。
Is there something that can help me force the source upgrade via this way? 有什么可以帮助我通过这种方式强制进行源升级的东西吗?
Based on your question, I tried to create a Simple Example of MVVM Pattern with very basic functionality. 根据您的问题,我尝试创建具有基本功能的MVVM模式的简单示例。 Please do necessary change to XAML and CS file as I took the highlighted code only.
请仅对突出显示的代码进行XAML和CS文件的必要更改。
Helper Classes 助手类
public abstract class ViewModelBase : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propName)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propName));
}
}
}
public class CommandHandler : ICommand
{
public event EventHandler CanExecuteChanged { add { } remove { } }
private Action<object> action;
private bool canExecute;
public CommandHandler(Action<object> action, bool canExecute)
{
this.action = action;
this.canExecute = canExecute;
}
public bool CanExecute(object parameter)
{
return canExecute;
}
public void Execute(object parameter)
{
action(parameter);
}
}
ViewModel 视图模型
public class ViewModel : ViewModelBase
{
private string groupAddress;
public string GroupAddress
{
get
{
return groupAddress;
}
set
{
if(value != groupAddress)
{
groupAddress = value;
OnPropertyChanged("GroupAddress");
}
}
}
public ViewModel()
{
}
private ICommand clickCommand;
public ICommand ClickCommand
{
get
{
return clickCommand ?? (clickCommand = new CommandHandler(() => MyAction(), true));
}
}
public void MyAction()
{
GroupAddress = "New Group Address";
}
}
Window Xaml 窗口Xaml
<TextBox Grid.Column="1" Grid.Row="1" Width ="80"
Text="{Binding GroupAddress, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
<Button Content="Push" Style="{StaticResource TransparentButtonStyle}"
Margin="5" Command="{Binding ClickCommand}"/>
Window Xaml cs Window Xaml CS
ViewModel vm = new ViewModel();
this.DataContext = vm;
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