[Converters] Static converter interface for x:Bind

[Avid29]

Describe the bug

Very often binding requires a small, rather trivial, function... So trivial that if it weren't needed in XAML it would just be inline code.

Converters exist to bridge this gap, but using a full converter instance can be unnecessarily heavy when using x:Bind, which allows function binding.

My proposal is to introduce public static methods that provide the actual, strongly-type, conversion function into all of the toolkit converters.

Steps to reproduce

N/A

Expected behavior

This:

<Resources>
  <convert:BoolNegationConverter x:Key="BoolNegationConverter"/>
</Resources>
...
<ToggleSwitch Value="{x:Bind MyValue, Converter={StaticResource BoolNegationConverter} Mode=OneWay}">

Could be replaced with this:

<ToggleSwitch Value="{x:Bind convert:BoolNegationConverter.Convert(MyValue), Mode=OneWay}">

Screenshots

No response

Code Platform

• UWP
• WinAppSDK / WinUI 3
• Web Assembly (WASM)
• Android
• iOS
• MacOS
• Linux / GTK

Windows Build Number

• Windows 10 1809 (Build 17763)
• Windows 10 1903 (Build 18362)
• Windows 10 1909 (Build 18363)
• Windows 10 2004 (Build 19041)
• Windows 10 20H2 (Build 19042)
• Windows 10 21H1 (Build 19043)
• Windows 10 21H2 (Build 19044)
• Windows 10 22H2 (Build 19045)
• Windows 11 21H2 (Build 22000)
• Other (specify)

Other Windows Build number

No response

App minimum and target SDK version

• Windows 10, version 1809 (Build 17763)
• Windows 10, version 1903 (Build 18362)
• Windows 10, version 1909 (Build 18363)
• Windows 10, version 2004 (Build 19041)
• Windows 10, version 2104 (Build 20348)
• Windows 11, version 22H2 (Build 22000)
• Other (specify)

Other SDK version

No response

Visual Studio Version

No response

Visual Studio Build Number

No response

Device form factor

No response

Additional context

BindBack will not be usable because it does not return an actual value and is basically just a function that runs when the dependency property is updated.

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[Avid29]

Discussed on Discord here