IsEnabled binding to a boolean

问题:

I have a list a simple dialog box which contains a few checkboxes, I wanted to have an Ok button that would be disabled unless the user changed a setting. In my view I have an OkEnabled property that I was binding the isEnabled property of the button to, if a check box changes its value it sets OkEnabled to true, but for some reason this doesnt enable the button.

public bool OkEnabled
{
    get
    {
        return m_okEnabled;
    }
    set
    {
        m_okEnabled = value;
        OnPropertyChanged("OkEnabled");
    }
}

<Button Content="OK" Style="{StaticResource MyButton}" Height="23" 
        HorizontalAlignment="Left" Margin="20" Name="m_okbutton" 
        VerticalAlignment="Top" Width="75"
        Click="okClick" IsEnabled="{Binding Path=OkEnabled}"/>

For some reason the Ok button won't change state when the OkEnabled property changes state. If I bind the IsEnabled property to one of the checkboxes I can see the button change state as the check box changes.

回答1:

In my view I have an OkEnabled property

By default, bindings are relative to the DataContext, not the view. Did you set the view as its own DataContext ?

回答2:

As you said that OkEnabled property is in view. which is not correct if you are using MVVM. It should be in model and assign model object into datacontext of view.