Intersoft Community - ClientUI - Add code to ViewModel Base to take advantage of Intellisense

Add code to ViewModel Base to take advantage of Intellisense

bbakermai — Wed, 07 Jul 2010 07:55:47 GMT

I've always thought it made more sense to call it RaisePropertyChanged, since I'm explicitly calling it in a setter, as opposed to reacting to an event with an On<event> method name. So, that's my convention, opinionated though it may be.

Add code to ViewModel Base to take advantage of Intellisense

technical@intersoftpt.com — Tue, 06 Jul 2010 06:18:53 GMT

Bob,

Thank you for your sharing your information. I have forwarded your feedback to our development team, it will be included in the RTM version of our templates and samples.

One thing that I noted is that you used RaisePropertyChanged name instead of OnPropertyChanged. Althought just a minor naming issue, we suggest that OnPropertyChanged is used instead of RaisePropertyChanged since it's more consistent with WPF-style MVVM guidelines.

Let me know if you have any thoughts or other questions on ClientUI.

Add code to ViewModel Base to take advantage of Intellisense

bbakermai — Mon, 05 Jul 2010 13:37:10 GMT

Adding something like this to your ViewModelBase:

        public void RaisePropertyChanged<TProperty>(Expression<Func<TProperty>> property)
        {
            if (PropertyChanged == null)
            {
                return;
            }
 
            var lambda = (LambdaExpression)property;
 
            MemberExpression memberExpression;
 
            if (lambda.Body is UnaryExpression)
            {
                var unaryExpression = (UnaryExpression)lambda.Body;
                memberExpression = (MemberExpression)unaryExpression.Operand;
            }
            else memberExpression = (MemberExpression)lambda.Body;
 
            OnPropertyChanged(memberExpression.Member.Name);
        }

will allow for code like this in ViewModel class property setters:

RaisePropertyChanged( () => MyProperty);

The result is no more typos inside of string properties. Of course, if you've copying and pasting, you can still forget to change the property for the pasted one.