在WPF中绑定列表框项IsEnabled [英] Binding listbox item IsEnabled in WPF

问题描述

我已经为此工作了大约一个小时.
我的问题很简单:
我有一个类似
的列表框

I''ve been working on this for about an hour.
My problem is very simple:
I''ve a listbox like

<listbox istabstop="True" keyboardnavigation.tabnavigation="Continue">
 <listboxitem name="A" isenabled="{Binding EnableA}" content="aa"></listboxitem>
<listboxitem name="B" content="bb"></listboxitem>
 </listbox>

我想在视图模型中使用EnableA切换IsEnabled属性..

在此先感谢您的帮助...

i want to switch the IsEnabled property using EnableA in the viewmodel..

thanks in advance for any help...

推荐答案

我认为您的问题出在您的表单构造函数中.您需要使用新语法实例化viewmodel.应该是这样的:-

I think your problem lies in your form constructor. you need to instantiate the viewmodel using the new syntax. It should be something like this:-

public testView(INavigationViewModel model, IEventAggregator eventaggricator) 
            { 
                InitializeComponent(); 
                model viewModel = new model();
                this.DataContext = viewModel;
                this.eventaggricator = eventaggricator; 
            } 

希望对您有帮助

Hope this helps

ListBox是Items容器.所以我通常在ViewModel中设置一个ObservableCollection of Models；每个模型的每个绑定属性都有INotifyPropertyChanged；然后将Listbox使用ItemTemplate绑定到ObservableCollection，以格式​​化每个Model的显示.

然后只需切换适当的Model的boolean属性，并且如果绑定正确，相应的ListBoxItem Enabled状态就会更改.

ListBox is an Items container. so I usually set up an ObservableCollection of Models in the ViewModel; each Model has INotifyPropertyChanged for each bound property; and the Listbox is bound to the ObservableCollection using an ItemTemplate to format the displaying of each Model.

Then it is just a matter of toggling the appropriate Model''s boolean property and the corresponding ListBoxItem Enabled state will change if correctly bound.

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