System.Mvvm

Model View View Model (MVVM) classes with built in Dependency Injection (DI) for all variants of .NET.

Also provides centralised multi-platform UI Management for WPF (.NET Framework, .NET Core 3.1 and .NET 6.x), WinUI 3, UWP and Xamarin.Forms for calling UI functionality from your Non-UI shared code.

Functionality

• Implements INotifyPropertyChanged
• Implements INotifyDataErrorInfo
• Events for handling and detecting changes
• Additional properties for
  • IsLoaded
  • IsBusy
  • IsBusyReveresed
  • IsValid
  • IsEditable
  • IsEditableReversed
• Data Validation
• Built-In Error notification methods
• ICommand binding helpers
• Notification extension actions
  • Rather than overriding a property, add an action when it changes
• Base View Models for
  • Forms
  • Lists
  • Searchable Lists
  • Tree View Searchable Lists
• UI
  • Core UI functions for Showing Alerts and Confirmation Dialogs (using platform specific implementations)
    • UWP, WinUI and WPF (.NET Framework and .NET Core 3.1, .NET 6+) and Xamarin.Forms

Classes

ViewModel

This is the base View Model abstract class which contains the most common MVVM functionality

ListViewModel<T,T2>

This class inherits from ViewModel and provides additonal functionality for managing lists of data

SearchViewModel<T, T2>

This class inherits from ListViewModel<T,T2> and adds search and filtering functionality to the standard ListViewModel

SearchTreeViewModel<T, T2>

This class inherits from SearchViewModel<T, List<T>> and adds Tree Path preparation to the standard SearchViewModel

Using System.Mvvm

Basic ViewModel

All of the ViewModel base classess are in the System.Mvvm namespace. To create a basic ViewModel simple inherit from ViewModel.

using System.Mvvm;
...
public class MainViewModel : ViewModel
{

To create a notifiable property create a property with a backing field using the propfull snippet and add a call to NotifyPropertyChanged.

private int myVar;

public int MyProperty
{
    get { return myVar; }
    set { myVar = value;  NotifyPropertyChanged();}
}

NotifyPropertyChanged will automatically pickup the calling member, but you can also be explicit.

private int myVar;

public int MyProperty
{
    get { return myVar; }
    set { myVar = value; NotifyPropertyChanged(nameof(MyProperty)); }
}

UI

UI functionality is provided through nuget packages for each supported platform center around the DSoft.System.Mvvm.UI package, which allows you to access UI functionality from your shared Non-UI code.

Supported platforms

• WPF
  • .NET Framework 4.6.1 and above
  • .NET Core 3.1
  • .NET 6.x and above
    • Windows 10 and above is supported for both net6.0-windows7 and net6.0-windows10.0.18362.0 target framework monikers (TFMs) incase you want to use the Windows 10 SDK in your WPF app.
• UWP/WinUI
  • UWP Windows 10 version 2004 (19041) and above
  • WinUI using Windows App SDK 1.0 or above using .NET 6.0 or above
    • Windows 10 version 2004 (19041) and above
• Xamarin.Forms
  • Xamarin.Forms 5.x for .Net Standard 2.0 and above
    • Use on the shared project containing the Xamarin Application not the platform specific mobile apps.