之前基于WPF 3.0开发的应用程序有一个DelegateCommand类型,在升级至WPF 4.0后发现CanExecuteChanged事件产生通知后对应的UI并未产生变化。 1///<summary>2///委托命令3///</summary>4publicclassDelegateCommand<T>: ICommand5{6///<summary>7///命令执行前事件8///</summary>9publiceventEventHandler<CancelEventAr...
1回答 WPF mvvm按钮(ICommand) CanExecute不工作 、、 CanExecute仅执行一次。LoadLogTable); private bool LogIsSelected() // return true; //Funktionerit im WPF 浏览78提问于2019-11-02得票数 0 2回答 WPF中带有MVVM的ICommand 、 我是MVVM和WPF的新手,尝试在WPF和MVVM中使用ICommand。下面是密码。感谢...
Can I bind a Boolean value to a button click ? can I bind a controls IsEnabled to the SelectedIndex of one or more comboboxes? Can I create DataTemplate Programatically? Can I Customize Grid Lines in WPF? Can I declare variable in the XAML code? Can I get the DatePicker to display a...
关于wpf 的ICommand 的 CanExecute CanExecuteChanged func action的认识
WPF 中的命令是藉由實作ICommand介面來建立。ICommand公開兩個方法:Execute和CanExecute,以及一個事件CanExecuteChanged。Execute執行與命令建立關聯的動作。CanExecute判斷命令是否可以在目前命令目標上執行。 如果集中命令作業的命令管理員偵測到命令來源的變更可能會使命令繫結已引發但尚未執行的命令失效,則會引發CanExecuteCha...
因为CanExecuteChanged发生,使用者的第一感觉就是CanExecute从false变到true或者由true变到false了。 关于这个设计问题,我想不出原因,所以希望高人解释下。:) 另外,还有一个小问题,MSDN中说到: In theWindowsPresentation Foundation (WPF) commanding system, the CommandTarget property on a ICommandSource is only ...
ICommand CanExecute() not working ICommand.CanExecute in MVVM Image border Image doesn't change when ImageSource changed Image in button not showing up when execution Image is not showing in runtime. Image Quality WPF Image Refresh problem Image shows during design time but not during runtime ...
WPF implements the command concept via the ICommand interface. This is part of the Microsoft .NET Framework. This interface has two methods and an event: void Execute(object parameter)—This executes code when the command is invoked. bool CanExecute(object parameter)—This determines i...
The CAL includes new commands such as the DelegateCommand<T>, which allows you to specify the two delegates for the Execute and CanExecute methods in the constructor. Using this command allows you to wire up views without having to delegate through methods defined in the view itself and wi...
ICommand CanExecute() not working ICommand.CanExecute in MVVM Image border Image doesn't change when ImageSource changed Image in button not showing up when execution Image is not showing in runtime. Image Quality WPF Image Refresh problem Image shows during design time but not during runtime ...