Add converter

src/Converters/Converters/Converters.csproj

@@ -45,6 +45,7 @@
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="UpperTextConverter.cs" />
     <Compile Include="ValueConversionAttribute.cs" />
+    <Compile Include="ValueConverterGroup.cs" />
   </ItemGroup>
   <ItemGroup>
     <Reference Include="Xamarin.Forms.Core, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">

src/Converters/Converters/ValueConverterGroup.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using Xamarin.Forms;
+
+namespace FormsCommunityToolkit.Converters
+{
+    /// <summary>
+    /// Conversion values using the sequential conversion of each of the converters from the first to the last.
+    /// </summary>
+    [ValueConversion(typeof(IEnumerator<IValueConverter>), typeof(IEnumerator<IValueConverter>))]
+    public class ValueConverterGroup : List<IValueConverter>, IValueConverter
+    {
+        public static ValueConverterGroup Instance { get; } = new ValueConverterGroup();
+
+        /// <summary>
+        /// Convert the value using a sequence of converters, from first to last.
+        /// </summary>
+        /// <param name="value"></param>
+        /// <param name="targetType"></param>
+        /// <param name="parameter"></param>
+        /// <param name="culture"></param>
+        /// <returns>Result of executing a sequence of converters.</returns>
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return this.Aggregate(value, (current, converter) => converter.Convert(current, targetType, parameter, culture));
+        }
+
+        /// <summary>
+        /// Converts the back.
+        /// </summary>
+        /// <param name="value"></param>
+        /// <param name="targetType"></param>
+        /// <param name="parameter"></param>
+        /// <param name="culture"></param>
+        /// <returns></returns>
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) => null;
+    }
+}