WPF暂时禁用用户输入功能

本文介绍了WPF暂时禁用用户输入功能的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

大家好， 我又回来了另一个问题，不过在这个问题上我还没有尝试过。这是因为我真的不知道从哪里开始。 情景 我有一个WPF应用程序基于MVVM原则构建（虽然我认为它不是100％MVVM）。 该应用程序具有以下结构：

Hi Guys, I'm back again with another question, however on this one I've not actually tried anything yet. This is because I don't really have a clue where to start. Scenario I have an WPF application built on MVVM principles (although it is not 100% MVVM I think). The application has the following structure:

Main Window ->ViewContainer (has a menu system in it that creates buttons based on viewmodel) -> View A -> View B -> View C

问题/要求 查看C上有一个按钮在其底层viewmodel上调用命令，现在问题是这是一个长时间运行的命令，我想要做的是阻止用户进行任何用户交互但保持应用程序能够更新。该进程在单独的线程上运行，因此UI可以更新屏幕日志。但是用户仍然可以单击ViewContainer菜单中的按钮并更改视图。我需要防止这种情况，因为在此过程运行时其他选项不应该运行。 目前我可以禁用交互View C，但尝试adhear到MVVM我不知道如何将这种行为应用到父容器？ 任何帮助/指针都将不胜感激。 需要更多信息，请问。

Problem/requirement View C has a button on it that calls a command on its underlying viewmodel, now the issue is this is a long running command and what I want to do is prevent the user from doing any user interaction but keep the application able to update. The process runs on a separate thread so the UI can update an onscreen log. But the user can still click buttons in the ViewContainer menu and change views. I need to prevent this because the other options shouldn't run while this process is running. Currently I am able to disable interaction View C, but with trying to adhear to MVVM I'm not sure how I can apply this behavior to parent containers? Any help/pointers would be appreciated. Need more info, just ask.

推荐答案

尝试为负责更改视图的按钮定义一个命令。 br /> 你应该使用一个委托命令。 Try to define a command for the buttons which are responsible for the change of the view. You should use a Delegate Command for this. class DelegateCommand : ICommand { private readonly Predicate<object> _canExecute; private readonly Action<object> _execute; public event EventHandler CanExecuteChanged; public DelegateCommand(Action<object> execute) { _execute = execute; } public DelegateCommand(Action<object> execute, Predicate<object> canExecute) { _execute = execute; _canExecute = canExecute; } public bool CanExecute(object parameter) { if (_canExecute == null) { return true; } return _canExecute(parameter); } public void Execute(object parameter) { _execute(parameter); } public void RaiseCanExecuteChanged() { if (CanExecuteChanged != null) { CanExecuteChanged(this, EventArgs.Empty); } } }

它让您有机会定义命令是否可执行或不。 要做到这一点，尝试做这样的事情：

It gives you the opportunity to define whether the command is executable or not. To do this, try doing something like this:

// public ICommand SwitchViewCommand { get; set; } public void SwitchView(object parameter) { //Your Logic here. }

public bool AllowSwitchView(object parameter) { //Your Conditions here }

并且不要忘记实例化你的命令：

And dont forget to instantiate your command:

SwitchViewCommand = new DelegateCommand(SwitchView, AllowSwitchView);

我希望这会对你有所帮助:) 抱歉我的英文不好。

I hope this will help you :) And sorry for my bad english.