DSoft.System.Mvvm 3.0.2110.41-prerelease

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 5.x) and WinUI 3 (Preview 4 and above)(Experimental)

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 5+)

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)); }
}

Using System.Mvvm.Ui

The UI static class provides two features

• A central interface for calling some simple UI functions
  • ShowAlert(string title, string message)
    • Show an alert with a title and message
  • ShowConfirmation(string title, string message)
    • Show a confirmation dialog and return the result
  • InvokeOnUIThread(Action)
    • Execute the action on the UI thread
  • InvokeOnUIThreadAsync(Action)
    • Execute the action on the UI thread asyncronously

The standard UI functions can be called directly after adding the DSoft.Mvvm.Ui package

using System.Mvvm;
... 

var result = await UI.ShowConfirmationDialogAsync("Confirm this", "This is a platform specific confirmation message");

if (result)
    await UI.ShowAlertAsync("YAY!", "You confirmed that");

NOTE: The standard UI functions only work when the platform code has been registered using MvvmManager.Init on the supported plaforms

MvvmManager

MvvmManager is a class that is found in the Dsoft.System.Mvvm.Ui package and registers the standard UI implementation for UI for each supported platform.

Call MvvmManager.Initto initialise the platform implementation.

NOTE: Only WPF(.NET framework, .NET Core 3.1, .NET 5.x) and WinUI 3 (Preview 4 and above) and UWP are supported with MvvmManager at the moment