double-to-int-converter.md

title	author	description	ms.date
DoubleToIntConverter - .NET MAUI Community Toolkit	bijington	The DoubleToIntConverter is a converter that allows users to convert an incoming double value to an int and vice-versa.	03/09/2022

DoubleToIntConverter

The DoubleToIntConverter is a converter that allows users to convert an incoming double value to an int and vice-versa. Optionally the user can provide a multiplier to the conversion through the Ratio property.

The Convert method returns the supplied value converted to an int and multiplied by a ratio.

The ConvertBack method returns the supplied value converted to a double and divided by a ratio.

Note

Note that the ratio can be supplied in the following ways:

1. as the ConverterParameter in the converter binding,
2. as the Ratio property on the converter.

Note that the ConverterParameter option will take precedence over the Ratio property.

[!INCLUDE common converter properties]

Syntax

XAML

Including the XAML namespace

[!INCLUDE XAML usage guidance]

Using the DoubleToIntConverter

The DoubleToIntConverter 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.DoubleToIntConverterPage">

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

    <Label Text="{Binding MyValue, Converter={StaticResource DoubleToIntConverter}}" />

</ContentPage>

C#

The DoubleToIntConverter can be used as follows in C#:

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

		label.SetBinding(
			Label.TextProperty,
			new Binding(
				nameof(ViewModel.MyValue),
				converter: new DoubleToIntConverter()));

		Content = 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 DoubleToIntConverterPage : ContentPage
{
    public DoubleToIntConverterPage()
    {
        Content = new Label()
            .Bind(
                Label.TextProperty,
                static (ViewModel vm) => vm.MyValue,
                converter: new DoubleToIntConverter());
    }
}

Properties

Property	Type	Description
Ratio	int	The multiplier to apply during the conversion.

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 DoubleToIntConverter over on the .NET MAUI Community Toolkit GitHub repository.