Question

I am using the following query:

string query = @"SELECT r.id, user_name, user_phone, date_create, REPLACE( date_payment,  '0000-00-00 00:00:00',  'Не оплачено' ) as 
                date_payment, payment_method, amount, rs.name_ru
                FROM request AS r, request_status AS rs
                WHERE r.status = rs.id";

And i am binding datatemplate in the following way:

DataTemplate>
    <TextBlock VerticalAlignment="Center" Text="{Binding date_payment}" Width="135" />
</DataTemplate>

Its throwing correct output except the “date_payment” Its output value comes “System.Byte[]“.
please help!!!

Thank from MBen

class ByteArrayToString : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null)
            {
                var listOfBytes = value as Byte[];
                string output = "";
                output = System.Text.Encoding.UTF8.GetString(listOfBytes);
                return output;
            }

            return "";
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }

Answer 1

date_payment is an Array, and you didn’t provide any way for WPF for displaying it, so it calls ToString . You can provide a data converter for it.

Add a resource to your Window or page :

   <Window.Resources>
        <local:ByteArrayToString x:Key="ByteArrayConverter" />
    </Window.Resources>

Use it in your TextBlock as such :

<TextBlock VerticalAlignment="Center" Text="{Binding date_payement, Converter={StaticResource ByteArrayConverter}}" Width="135" />

Now you need to add a new class that does the conversion :

    class ByteArrayToString : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value != null)
            {
                var listOfBytes = value as Byte[];
                string output ="";
                output = listOfBytes.Aggregate(output, (current, elemt) => current + elemt.ToString());
                return output;
            }

            return "";
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return DependencyProperty.UnsetValue;
        }
    }