Xamarin Community Toolkit: EqualConverter, NotEqualConverter, and Data Types

Question

Xamarin Community Toolkit: EqualConverter, NotEqualConverter, and Data Types

Nathan Sokalski 4,056

I am using the EqualConverter & NotEqualConverter IValueConverter(s) from the Xamarin Community Toolkit. I am comparing the TranslationY property of an element to the value of the ConverterParameter as follows:

IsVisible="{Binding TranslationY,Source={x:Reference frmNavigation},Converter={StaticResource Equal},ConverterParameter=57}"
IsVisible="{Binding TranslationY,Source={x:Reference frmNavigation},Converter={StaticResource NotEqual},ConverterParameter=57}"

However, the result is False for both of the above, regardless of the value of TranslationY or the ConverterParameter. Back when I was using UWP, I had a problem like this that was caused by the value & ConverterParameter not being of the same type (TranslationY is a Double, I'm not sure what type the converter views the ConverterParameter as). I solved this by writing my own IValueConverter, but I am wondering if there is any way to avoid needing to do this? Thanks.

Cole Xia (Shanghai Wicresoft Co,.Ltd.) 6,726 Reputation points

2020-12-23T06:20:19.037+00:00

@Nathan Sokalski

It will be helpful if you provide the code in EqualConverter and NotEqualConverter .

acmeaney 76

//Equal
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
            => (value != null && value.Equals(parameter)) || (value == null && parameter == null);

//Not Equal
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
            => !((value != null && value.Equals(parameter)) || (value == null && parameter == null));

There isn't much in here that would say they have to be the same type to me, but the easiest way to see is to put them in your own converter and check out what happens using breakpoints.

Nathan Sokalski 4,056 Reputation points

2020-12-23T17:14:36.173+00:00

EqualConverter & NotEqualConverter are part of the Xamarin Community Toolkit. I have not seen the code.

Cole Xia (Shanghai Wicresoft Co,.Ltd.) 6,726 Reputation points

2020-12-23T06:20:19.037+00:00

@Nathan Sokalski

It will be helpful if you provide the code in EqualConverter and NotEqualConverter .
acmeaney 76 Reputation points

2020-12-23T15:09:56.367+00:00

//Equal public object Convert(object value, Type targetType, object parameter, CultureInfo culture) => (value != null && value.Equals(parameter)) || (value == null && parameter == null); //Not Equal public object Convert(object value, Type targetType, object parameter, CultureInfo culture) => !((value != null && value.Equals(parameter)) || (value == null && parameter == null));

There isn't much in here that would say they have to be the same type to me, but the easiest way to see is to put them in your own converter and check out what happens using breakpoints.
Nathan Sokalski 4,056 Reputation points

2020-12-23T17:14:36.173+00:00

EqualConverter & NotEqualConverter are part of the Xamarin Community Toolkit. I have not seen the code.

Answer 1

Hello,

Welcome to our Microsoft Q&A platform!

You could compare the source code of EqualConverter class with the other converter class such as IntToBoolConverter. The EqualConverter and NotEqualConverter class don't return a value in the Convert and ConvertBack method.

The EqualConverter function is not supported for now, you could report an issue or a feature request to the product team on github.

Source code link:
https://github.com/xamarin/XamarinCommunityToolkit/tree/main/src/CommunityToolkit/Xamarin.CommunityToolkit/Converters

Best Regards,

Jarvan Zhang

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Xamarin Community Toolkit: EqualConverter, NotEqualConverter, and Data Types

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