NET MAUI binding elemens of an 2D multidimensional-CodePudding

what would be the way to bind an element of an 2D multidimensional array in NET MAUI?

I tried to do the following:

<Label Text="{Binding Calendar.MatrixMonth[0,0]}"
                       Style="{StaticResource subTitleLightTextStyle}"
                       Grid.Row="2"
                       HorizontalOptions="Start" />

But that doesn't work, it just shows the error:

No constructor for type 'BindingExtension' has 2 parameters

CodePudding user response：

It seams that you are trying to use the Binding markup extension (which only accepts one parameter as the path of property to bind) You need something like x:Bind in UWP's which unfortunately is not yet supported in MAUI out of the box. But there is a library that allows you to do so here. So you can try this code (not tested):

<Label Text="{x:Bind Calendar.MatrixMonth[0,0]}"
                       Style="{StaticResource subTitleLightTextStyle}"
                       Grid.Row="2"
                       HorizontalOptions="Start" />

CodePudding user response：

I cannot find a directly binding way for 2D array. But you could use ValueConverter as an alternative. Try the following code:

In xaml,

//define a value converter
<ContentPage.Resources>
    <local:ArrayToStringConverter x:Key="arrayToStringConverter"/>
</ContentPage.Resources>

...
// for label, consume this converter and pass the parameter "1,1" as index
<Label  FontSize="32" HorizontalOptions="Center" Text="{Binding Calendar.MatrixMonth,
                                Converter={StaticResource arrayToStringConverter},
            ConverterParameter='1,1'}">

And you could generate a new file to do value converter:

public class ArrayToStringConverter : IValueConverter
{

    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
       var a = value as string[,];
        string p = parameter.ToString();
        var index1 = int.Parse(p.Split(",")[0]);
        var index2 = int.Parse(p.Split(",")[1]);
        return a[index1, index2];
    }
....
}

For more info, you could refer to Binding value converters

Hope it works for you.