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C# - SOLID Question

Posted on 2016-09-24
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Last Modified: 2016-09-29
I'm working on a Xamarin App.  I'm using the MVVM pattern.  I have two view models.  I'm setting the title and both titles are exactly the same as displayed below.  My question is how would you separate this so the title is set once so it is not in two different classes?

    public class MainPageViewModel : BaseViewModel
    {
        public string MainTitle { get; set; }
        public ICommand ButtonCommand { get; set; }

        public MainPageViewModel()
        {
            this.MainTitle = "My Title";
        }
    }

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Question by:CipherIS
6 Comments
 
LVL 33

Expert Comment

by:ste5an
ID: 41814120
The question is: Why do you have two view models?

Without further information: Setting the title should be done in your base view model class.
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Author Comment

by:CipherIS
ID: 41814224
I'm creating a viewmodel for each View as they will both have different functionality.
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Accepted Solution

by:
Miguel Oz earned 500 total points
ID: 41814229
You could create a base class for your common view model code:
public class MyAppViewModel : BaseViewModel
{
    public string MainTitle { get; set; }

    public MainPageViewModel()
    {
        this.MainTitle = "My Title";
    }
}

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and then use It in your view model:
public class MainPageViewModel : MyAppViewModel
{
    public ICommand ButtonCommand { get; set; }

    public MainPageViewModel() : base()
    {
    }
}

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LVL 33

Expert Comment

by:sarabande
ID: 41814783
Setting the title should be done in your base view model class.

ste5an is right. a common base class for both the views is the right place to set the title if it is the same for both views.

i don't see a reason to creating a further baseclass.

Sara
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Author Comment

by:CipherIS
ID: 41814898
This is the code in my BaseViewModel.  You would still add the Text in the BaseViewModel?

public abstract class BaseViewModel : INotifyPropertyChanged
    {
        public INavigation Navigation { get; set; }

        protected BaseViewModel(INavigation navigation = null)
        {
            Navigation = navigation;
        }

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Expert Comment

by:ste5an
ID: 41814900
Yup.
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