What is the XAML syntax to pass several enum values to a converter parameter in MAUI?

Question

I am able to provide one enum value as a ConverterParameter like so:

Text="{Binding TextValue, Converter={mct:TextConverter}, ConverterParameter={x:Static local:MyEnum.Value1}}"

Or several values of simple types like so:

Text="{Binding TextValue, Converter={mct:TextConverter}, ConverterParameter='1|2'}"

But I have not figured out even after some research how tot provide several values of an enumeration type (flag enum).

What I am trying to do is something like:

ConverterParameter = {local:MyEnum.Value1|local:MyEnum.Value2}

Maybe I should use an array of object instead of trying of providing flag values as it is not supported in XAML syntax? Thanks for any input on this

Answer 1

You need to handle the flags in your Model or ViewModel. XAML is not C#, so you cannot use the pipe (|) to use multiple flags in a binding expression or directly as an expression for a converter parameter.

However, what you can do is something like this in C#:

[Flags]
public enum MyEnum
{
    Value1,
    Value2,
    Value3
}

public partial class MyModel : ObservableObject
{
    [ObservableProperty]
    private MyEnum _flags;

    [ObservableProperty]
    private string _textValue;

    public MyModel()
    {
        Flags = Value1 | Value3;
        TextValue = "Some Text";
    }
}

And then consume the Flags property as a binding argument to the ConverterParameter in your XAML:

<Label>
    <Label.Text>
        <Binding
            Path="TextValue"
            Converter="{mct:TextConverter}"
            ConverterParameter="{Binding Flags}" />
    </Label.Text>
</Label>