根据状态禁用多个控件 [英] Disabling multiple controls depending on a state

问题描述

我是Caliburn和WPF的新手，请问这是一个非常琐碎的问题。

I'm new to both Caliburn and WPF, so excuse me if it is a rather trivial question.

情况如下：
我具有多个控件（例如按钮和文本框-后者是重要的部分）。
其状态（启用/禁用）取决于布尔属性。

The scenario is the following: I have multiple controls (like buttons and textboxes - the latter is the important part). Their state (Enabled/Disabled) are dependent on a boolean property.

我尝试使用的第一个建议方法是使用Can [FunctionName]约定和NotifyOfPropertyChange（ （）=> Can [FunctionName]）。

The first suggested method I tried was using the Can[FunctionName] convention and NotifyOfPropertyChange(() => Can[FunctionName]). It worked well with the button, but it did not work with the textbox.

如何将IsEnabled属性绑定到状态而不使用View的代码？

How do I bind IsEnabled property to a state without using the code-behind of the View?

我在ViewModel中尝试的代码不适用于文本框：

The code I tried in the ViewModel didn't work for the textbox:

private bool _buttonEnableState = true;

public bool ButtonEnableState
{
    get
    {
        return _buttonEnableState;
    }

    set
    {
        _buttonEnableState = value;

        NotifyOfPropertyChange(() => CanTheButton);
        NotifyOfPropertyChange(() => CanTheTextBox);
    }
}

public bool CanTheButton
{
    get
    {
        return ButtonEnableState;
    }
}

public void TheButton()
{
}

public bool CanTheTextBox
{
    get
    {
        return ButtonEnableState;
    }
}

从视图中：

<Button x:Name="TheButton" Content="This is the button" ... />
<TextBox x:Name="TheTextBox" ... />

预先感谢！

推荐答案

您是否尝试过显而易见的操作？：

Have you tried the obvious?:

<Button Content="This is the button" IsEnabled="{Binding ButtonEnableState}" />
<TextBox x:Name="TheTextBox" IsEnabled="{Binding ButtonEnableState}" />

更新>>>

继续从评论中进行对话...现在，您在 AppViewModel 类中有一个 public 属性，并且它的一个实例类设置为包含 Button 和 TextBox DataContext c $ c>控件？

So, continuing the conversation from the comments... now you have a public property in your AppViewModel class and an instance of that class is set as the DataContext of your view that contains the Button and TextBox controls?

让我们看看 Binding 是否确实在工作？不...尝试将您的代码更改为：

Let's see if the Binding is really working or not... try changing your code to this:

<Button Content="{Binding ButtonEnableState}" />

如果设置了 Button.Content ， Binding 可以正常工作，并且您有其他问题。

If the Button.Content is set then the Binding works just fine and you have a different problem.

UPDATE 2 >>>

UPDATE 2 >>>

正如@Charleh所述，您还需要确保已将属性值的更改通知 INotifyPropertyChanged 接口：

As @Charleh mentioned, you also need to make sure that you have notified the INotifyPropertyChanged interface of the change of property value:

NotifyOfPropertyChange(() => ButtonEnableState);

这篇关于根据状态禁用多个控件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！