ColorToPercentCyanConverter

The ColorToPercentCyanConverter is a one way converter that allows users to convert an incoming Color to the cyan component as a value between 0 and 1.

The Convert method returns the cyan component as a value between 0 and 1 from the supplied value.

The ConvertBack method is not supported.

BaseConverter Properties

The following properties are implemented in the base class, public abstract class BaseConverter:

Property	Description
DefaultConvertReturnValue	Default value to return when IValueConverter.Convert(object?, Type, object?, CultureInfo?) throws an Exception. This value is used when CommunityToolkit.Maui.Options.ShouldSuppressExceptionsInConverters is set to true.
DefaultConvertBackReturnValue	Default value to return when IValueConverter.ConvertBack(object?, Type, object?, CultureInfo?) throws an Exception. This value is used when CommunityToolkit.Maui.Options.ShouldSuppressExceptionsInConverters is set to true.

ICommunityToolkitValueConverter Properties

The following properties are implemented in the public interface ICommunityToolkitValueConverter:

Property	Type	Description
DefaultConvertReturnValue	object?	Default value to return when IValueConverter.Convert(object?, Type, object?, CultureInfo?) throws an Exception. This value is used when CommunityToolkit.Maui.Options.ShouldSuppressExceptionsInConverters is set to true.
DefaultConvertBackReturnValue	object?	Default value to return when IValueConverter.ConvertBack(object?, Type, object?, CultureInfo?) throws an Exception. This value is used when CommunityToolkit.Maui.Options.ShouldSuppressExceptionsInConverters is set to true.

Syntax

The following examples will show how to use the ColorToPercentCyanConverter to display the cyan component of a specific Color.

XAML

Including the XAML namespace

In order to use the toolkit in XAML the following xmlns needs to be added into your page or view:

xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"

Therefore the following:

<ContentPage
    x:Class="CommunityToolkit.Maui.Sample.Pages.MyPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml">

</ContentPage>

Would be modified to include the xmlns as follows:

<ContentPage
    x:Class="CommunityToolkit.Maui.Sample.Pages.MyPage"
    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit">

</ContentPage>

Using the ColorToPercentCyanConverter

The ColorToPercentCyanConverter can be used as follows in XAML:

<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:toolkit="http://schemas.microsoft.com/dotnet/2022/maui/toolkit"
             x:Class="CommunityToolkit.Maui.Sample.Pages.Converters.ColorToPercentCyanConverterPage">

    <ContentPage.Resources>
        <ResourceDictionary>
            <toolkit:ColorToPercentCyanConverter x:Key="ColorToPercentCyanConverter" />
        </ResourceDictionary>
    </ContentPage.Resources>

    <VerticalStackLayout>
         <Label Text="The cyan component is:" />

         <Label Text="{Binding MyFavoriteColor, Converter={StaticResource ColorToPercentCyanConverter}}" />
     </VerticalStackLayout>

</ContentPage>

C#

The ColorToPercentCyanConverter can be used as follows in C#:

class ColorToPercentCyanConverterPage : ContentPage
{
    public ColorToPercentCyanConverterPage()
    {
        var label = new Label();

 		label.SetBinding(
 			Label.TextProperty,
 			new Binding(
 				nameof(ViewModel.MyFavoriteColor),
 				converter: new ColorToPercentCyanConverter()));

 		Content = new VerticalStackLayout
 		{
 			Children =
 			{
 				new Label { Text = "The cyan component is:" },
 				label
 			}
 		};
    }
}

C# Markup

Our CommunityToolkit.Maui.Markup package provides a much more concise way to use this converter in C#.

using CommunityToolkit.Maui.Markup;

class ColorToPercentCyanConverterPage : ContentPage
{
    public ColorToPercentCyanConverterPage()
    {
        Content = new VerticalStackLayout
        {
            Children =
            {
                new Label()
                    .Text("The cyan component is:"),
                new Label()
                    .Bind(
                        Label.TextProperty,
                        static (ViewModel vm) => vm.MyFavoriteColor,
                        converter: new ColorToPercentCyanConverter())
            }
        };
    }
}

Examples

You can find an example of this converter in action in the .NET MAUI Community Toolkit Sample Application.

API

You can find the source code for ColorToPercentCyanConverter over on the .NET MAUI Community Toolkit GitHub repository.