WPF enable/disable button depending on value

Question

i would like to enable/disable buttons according to the current active userlevel. i have a property in the MV for the current userlevel:

public int CurrentUserLevel
    {
        get { return _CurrentUserLevel; }
        set
        {
            if (_CurrentUserLevel == value)
                return;
            _CurrentUserLevel = value;
            RaisePropertyChanged("CurrentUserLevel");
        }
    }

how can i enable/disable the button if this value is >=x?

Breealzibub · Accepted Answer · 2014-07-17 14:26:32Z

5

You'll need to create a property in your ViewModel, for which the Button's IsEnabled property can bind to. Make sure that the new property's PropertyChanged event is raised whenever the CurrentUserLevel is changed.

public int CurrentUserLevel
{
    get { /*...*/ }
    set
    {
        /*...*/
        RaisePropertyChanged("CurrentUserLevel");
        RaisePropertyChanged("IsAllowedToDoSomething"); //dependant property
    } 
}

public bool IsAllowedToDoSomething
{
    get { return CurrentUserLevel > 1; }
}

And in your XAML:

<Button IsEnabled="{Binding IsAllowedToDoSomething}" Content="Click me!" />

edited Jul 17, 2014 at 14:26

answered Jul 17, 2014 at 13:52

Breealzibub

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3 Comments

el-nino Over a year ago

thanks for the answer. so if i have 5 userlevels (1 to 5), i'll need to create 5 properties right? for each level one.

Breealzibub Over a year ago

One for each type of binding you want to create on a Button, yes. MVVM ViewModels contain a lot of these "helper" properties, which make binding from the View more natural.

mins Over a year ago

Perhaps we can use binding converters and a single property instead of secondary properties. Converters accept a parameter, so maybe a single converter will be required.

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