How to show date by formatting?

Question

I have a model like below. On the Xaml side, I show the CreatedAt property in the ListView. However, this property must be formatted and displayed according to the current culture. When I do it on the XAML side, I have to specify a fixed format. I wonder how I can format the date and display it via CreateAt in a culturally sensitive manner? Thanks.

using System;

namespace Akıllı_Notlar.Models
{
    internal class Note
    {
        private int _ıd;
        private string _title;
        private string _content;
        private DateTime _createdAt;
        private DateTime? _updatedAt;

        public int Id { get => _ıd; set => _ıd = value; }

        public string Title { get => _title; set => _title = value; }

        public string Content { get => _content; set => _content = value; }

        public DateTime CreatedAt { get => _createdAt; set => _createdAt = value; }

        public DateTime? UpdatedAt { get => _updatedAt; set => _updatedAt = value; }

        public int CategoryId { get; set; }
        public Category Category { get; set; }
    }
}

Answer 1

I'm not too familiar with WPF but this SO post suggests using the StringFormat binding flag:

https://stackoverflow.com/questions/5046429/wpf-binding-stringformat-short-date-string#answer-5046460

e.g.

<TextBlock Text="{Binding CreatedAt, StringFormat=d}" />

Provided that you've set the current thread's culture to your user's culture this should hopefully work:

Thread.CurrentThread.CurrentCulture = new CultureInfo("en-GB");

Is this what you've already tried?

Answer 2

Sample using Language property .

<Window x:Class="Gekka.WpfApplication1.MainWindow1"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Gekka.WpfApplication1"
        mc:Ignorable="d"
        Title="MainWindow2" Width="200" FontSize="16" SizeToContent="Height">
    <StackPanel >
        <FrameworkElement.FlowDirection>
            <Binding ElementName="combo1" Path="SelectedItem">
                <Binding.Converter>
                    <local:FlowDirectionConverter />
                </Binding.Converter>
            </Binding>
        </FrameworkElement.FlowDirection>
        
        <ListView ItemsSource="{Binding}" Height="100" >
            <ListView.View>
                <GridView>
                    <GridView.Columns>
                        <GridViewColumn Header="Title" DisplayMemberBinding="{Binding Path=Title}" />
                        <GridViewColumn Header="CreatedAt"
                                        DisplayMemberBinding="{Binding Path=CreatedAt,StringFormat=d}" />
                    </GridView.Columns>
                </GridView>
            </ListView.View>
        </ListView>
        

        <ComboBox x:Name="combo1" SelectedItem="{Binding RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Window},Path=Language}">
            <ComboBox.ItemsSource>
                <x:Array Type="{x:Type x:XmlLanguage}">
                    <x:XmlLanguage>ar-ae</x:XmlLanguage>
                    <x:XmlLanguage>en-us</x:XmlLanguage>
                    <x:XmlLanguage>fr-fr</x:XmlLanguage>
                    <x:XmlLanguage>ja-jp</x:XmlLanguage>
                </x:Array>
            </ComboBox.ItemsSource>
        </ComboBox>
    </StackPanel>

</Window>

namespace Gekka.WpfApplication1
{
    using System;
    using System.Globalization;
    using System.Linq;
    using System.Windows;
    using System.Windows.Controls;

    public partial class MainWindow1 : Window
    {
        public MainWindow1()
        {
            InitializeComponent();

            this.Language = System.Windows.Markup.XmlLanguage.GetLanguage(System.Globalization.CultureInfo.CurrentUICulture.IetfLanguageTag);

            this.DataContext = new Note[] { new Note() };
        }

        class Note
        {
            public string Title { get; set; } = "Test";
            public DateTime? CreatedAt { get; set; } = DateTime.Now;
        }
    }

    class FlowDirectionConverter : System.Windows.Data.IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is System.Windows.Markup.XmlLanguage xl)
            {
                value = xl.GetEquivalentCulture();
            }

            if (value is System.Globalization.CultureInfo ci)
            {
                if (ci.TextInfo.IsRightToLeft)
                {
                    return FlowDirection.RightToLeft;
                }
            }
            return FlowDirection.LeftToRight;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }
}