如何使用MVVM模式“禁用”WPF中的按钮?

通过使用命令模式。在视图模型中:

public class MyViewModel : ViewModel
{
    private readonly ICommand someCommand;

    public MyViewModel()
    {
        this.someCommand = new DelegateCommand(this.DoSomething, this.CanDoSomething);
    }

    public ICommand SomeCommand
    {
        get { return this.someCommand; }
    }

    private void DoSomething(object state)
    {
        // do something here
    }

    private bool CanDoSomething(object state)
    {
        // return true/false here is enabled/disable button
    }
}

在你的XAML中:

<Button Command="{Binding SomeCommand}">Do Something</Button>

读 this post 了解更多关于 DelegateCommand .

只要绑定 IsEnabled 要关闭的按钮的属性:

<Button IsEnabled="{Binding CanClose}"/>

如果返回canexecute of icommand值false,则按钮将被禁用。因此,无论您的按钮绑定到什么命令,当您想要禁用它时,看看您是否可以返回canexecute值false。

这也是可行的:

视图 :

        <Button>
            <Button.Style>
                <Style>
                    <Setter Property="Content" Value="Scream" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding btnEnabled}" Value="True">
                            <Setter Property="IsEnabled" Value="True" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
        </Button>

视图模型 :

    private bool _btnEnabled;
    public bool btnEnabled
    {
        get { return _btnEnabled; }
        set
        {
            if (_btnEnabled != value)
            {
                _btnEnabled = value;
                OnPropertyChanged();
            }
        }
    }