DelegateBindings 1.1.0

dotnet add package DelegateBindings --version 1.1.0
NuGet\Install-Package DelegateBindings -Version 1.1.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="DelegateBindings" Version="1.1.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add DelegateBindings --version 1.1.0
#r "nuget: DelegateBindings, 1.1.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install DelegateBindings as a Cake Addin
#addin nuget:?package=DelegateBindings&version=1.1.0

// Install DelegateBindings as a Cake Tool
#tool nuget:?package=DelegateBindings&version=1.1.0

DelegateBindings

<a href="https://www.nuget.org/packages/DelegateBindings"><img src="https://img.shields.io/nuget/v/DelegateBindings" /></a>

Easy property bindings using delegates, with the help of Nito.Mvvm.CalculatedProperties.

How to use it

First you need view models implemented like this:

public class RootViewModel : INotifyPropertyChanged
{
	private readonly PropertyHelper properties;

	public RootViewModel()
	{
		properties = new(RaisePropertyChanged);
	}

	public event PropertyChangedEventHandler? PropertyChanged;

	private void RaisePropertyChanged(PropertyChangedEventArgs args) =>
		PropertyChanged?.Invoke(this, args);

	public string Text
	{
		get => properties.Get("");
		set => properties.Set(value);
	}

	public ObservableCollection<Item> Items =>
		properties.Get(() => new ObservableCollection<Item>());
}

public class ItemViewModel : INotifyPropertyChanged
{
	private readonly PropertyHelper properties;

	public ItemViewModel()
	{
		properties = new(RaisePropertyChanged);
	}

	public event PropertyChangedEventHandler? PropertyChanged;

	private void RaisePropertyChanged(PropertyChangedEventArgs args) =>
		PropertyChanged?.Invoke(this, args);

	public string Content
	{
		get => properties.Get("");
		set => properties.Set(value);
	}
}

Bind()

Then, it's just as simple as calling the binding like this:

using static DelegateBindings.DelegateBinder;

// ...

var binding1 = Bind(() => label1.Text = viewModel.Text);
var binding2 = Bind(() => label2.Text = viewModel.Items.FirstOrDefault()?.Content);

Whenever viewModel.Text changes, label1.Text will be changed as well.

It also works for observable collections. Whenever the Items list is updated, or the first item's Content is updated, label2.Text will also change.

WhenChanged()

Another alternative is to use WhenChanged() to subscribe to property changes.

using static DelegateBindings.DelegateBinder;

// ...

var binding3 = WhenChanged(() => viewModel.Text, x => Show(x));
var binding4 =
	WhenChanged(() => viewModel.Items.Count)
	.Subscribe(x => LogCount(x)); // Support for Rx.NET

void Show(string text)
{
	MessageBox.Show(text);
}

void LogCount(int count)
{
	Console.WriteLine($"We have {count} elements so far.");
}

Remarks

  • The Bind() method receives an Action, not an Expression, which means you're not limited by the C# features available in expressions.
  • The view models MUST be implemented with Nito.Mvvm.CalculatedProperties. If you're using other libraries, the bindings WON'T WORK.
  • Bindings are one-way. I'm planning to add two-way binding in the future but for now you can do two bindings like this:
    Bind(() => viewModel2.Result = viewModel1.Text);
    Bind(() => viewModel1.Text = viewModel2.Result);
    
    Or, for UI controls (WinForms, WPF, etc), use events directy:
    Bind(() => textBox.Text = viewModel1.Text);
    textBox.Validated += (_, _) => viewModel1.Text = textBox.Text;
    

License

MIT

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp1.0 was computed.  netcoreapp1.1 was computed.  netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard1.0 is compatible.  netstandard1.1 was computed.  netstandard1.2 was computed.  netstandard1.3 was computed.  netstandard1.4 was computed.  netstandard1.5 was computed.  netstandard1.6 was computed.  netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net45 was computed.  net451 was computed.  net452 was computed.  net46 was computed.  net461 is compatible.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen30 was computed.  tizen40 was computed.  tizen60 was computed. 
Universal Windows Platform uap was computed.  uap10.0 was computed. 
Windows Phone wp8 was computed.  wp81 was computed.  wpa81 was computed. 
Windows Store netcore was computed.  netcore45 was computed.  netcore451 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
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NuGet packages (1)

Showing the top 1 NuGet packages that depend on DelegateBindings:

Package Downloads
WebView2.DOM.Components

Define components for WebView2.DOM in a simple way

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Version Downloads Last updated
1.1.0 204 9/14/2023
1.0.0 157 8/20/2023