Nullable Guid Converter

This converter allows you to change a String to a Guid type. Some properties and bindings in XAML require this type, meaning a string with an actual Guid value within will still fail without this converter.

<Rock:Parameter Name="Guid"
    Value="{Binding ItemGuid, Converter={Rock:NullableGuidConverter}}" />

In this example, the string Guid value within ItemGuid would be converted to a Guid type.