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Billing.Shared/Languages/PlatformCulture.cs

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+namespace Billing.Languages
+{
+    public partial class PlatformCulture
+    {
+        public string PlatformString { get; set; }
+        public string LanguageCode { get; set; }
+        public string LocaleCode { get; set; }
+
+        public string Language => string.IsNullOrEmpty(LocaleCode) ? LanguageCode : LanguageCode + "-" + LocaleCode;
+
+        public partial string GetNamespace();
+        public partial void Init();
+
+        public PlatformCulture()
+        {
+            Init();
+        }
+
+        private void Init(string cultureString) 
+        {
+            if (string.IsNullOrEmpty(cultureString))
+            {
+                cultureString = "zh-CN";
+            }
+
+            PlatformString = cultureString.Replace('_', '-');
+            if (PlatformString.Contains('-'))
+            {
+                var parts = PlatformString.Split('-');
+                LanguageCode = parts[0];
+                LocaleCode = parts[^1];
+            }
+            else
+            {
+                LanguageCode = PlatformString;
+                LocaleCode = string.Empty;
+            }
+        }
+
+        private string ToDotnetFallbackLanguage()
+        {
+            string netLanguage = LanguageCode switch
+            {
+                // fallback to Portuguese (Portugal)
+                "pt" => "pt-PT",
+                // equivalent to German (Switzerland) for this app
+                "gsw" => "de-CH",
+
+                // add more application-specific cases here (if required)
+                // ONLY use cultures that have been tested and known to work
+
+                // use the first part of the identifier (two chars, usually);
+                _ => LanguageCode,
+            };
+            Helper.Debug($".NET Fallback Language/Locale: {LanguageCode} to {netLanguage} (application-specific)");
+            return netLanguage;
+        }
+
+        public override string ToString() => PlatformString;
+    }
+}

Billing.Shared/Languages/Resource.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Xml;
+using Xamarin.Forms;
+using Xamarin.Forms.Xaml;
+
+namespace Billing.Languages
+{
+    internal class Resource
+    {
+        public static string TitleDateFormat => Text(nameof(TitleDateFormat));
+
+        static readonly Dictionary<string, LanguageResource> dict = new();
+
+        public static string Text(string name, params object[] args)
+        {
+            string current = App.CurrentCulture.PlatformString;
+            if (!dict.TryGetValue(current, out LanguageResource lang))
+            {
+                lang = new LanguageResource(App.CurrentCulture);
+                dict.Add(current, lang);
+            }
+            if (args == null || args.Length == 0)
+            {
+                return lang[name];
+            }
+            return string.Format(lang[name], args);
+        }
+
+        private class LanguageResource
+        {
+            private readonly Dictionary<string, string> strings;
+
+            public string this[string key]
+            {
+                get
+                {
+                    if (strings?.TryGetValue(key, out string val) == true)
+                    {
+                        return val;
+                    }
+                    return key;
+                }
+            }
+
+            public LanguageResource(PlatformCulture lang)
+            {
+                try
+                {
+                    var ns = lang.GetNamespace();
+                    var langId = $"{ns}.Languages.{lang.Language}.xml";
+                    var langCodeId = $"{ns}.Languages.{lang.LanguageCode}.xml";
+                    var assembly = typeof(LanguageResource).Assembly;
+                    var name = assembly.GetManifestResourceNames().FirstOrDefault(n =>
+                        string.Equals(n, langId, StringComparison.OrdinalIgnoreCase) ||
+                        string.Equals(n, langCodeId, StringComparison.OrdinalIgnoreCase));
+                    if (name == null)
+                    {
+                        name = $"{ns}.Languages.zh-CN.xml";
+                    }
+                    var xml = new XmlDocument();
+                    using (var stream = assembly.GetManifestResourceStream(name))
+                    {
+                        xml.Load(stream);
+                    }
+                    strings = new Dictionary<string, string>();
+                    foreach (XmlElement ele in xml.DocumentElement)
+                    {
+                        strings[ele.Name] = ele.InnerText;
+                    }
+                }
+                catch (Exception ex)
+                {
+                    Helper.Error("language.ctor", $"failed to load json resource: {lang}, {ex.Message}");
+                }
+            }
+        }
+    }
+
+    [ContentProperty(nameof(Text))]
+    public class TextExtension : IMarkupExtension
+    {
+        public string Text { get; set; }
+
+        public object ProvideValue(IServiceProvider serviceProvider)
+        {
+            if (Text == null)
+            {
+                return string.Empty;
+            }
+            return Resource.Text(Text);
+        }
+    }
+}

Billing.Shared/Languages/en.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+	<Accounts>Accounts</Accounts>
+	<Bills>Bills</Bills>
+	<Settings>Settings</Settings>
+	<Sunday>Su</Sunday>
+	<Monday>Mo</Monday>
+	<Tuesday>Tu</Tuesday>
+	<Wednesday>We</Wednesday>
+	<Thursday>Th</Thursday>
+	<Friday>Fr</Friday>
+	<Saturday>Sa</Saturday>
+	<NoRecords>Bills not yet generated</NoRecords>
+	<Memo>Click here to record</Memo>
+	<TitleDateFormat>MM/dd/yyyy</TitleDateFormat>
+</root>

Billing.Shared/Languages/zh-CN.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<root>
+	<Accounts>账户</Accounts>
+	<Bills>账单</Bills>
+	<Settings>设置</Settings>
+	<Sunday>周日</Sunday>
+	<Monday>周一</Monday>
+	<Tuesday>周二</Tuesday>
+	<Wednesday>周三</Wednesday>
+	<Thursday>周四</Thursday>
+	<Friday>周五</Friday>
+	<Saturday>周六</Saturday>
+	<NoRecords>还未产生账单</NoRecords>
+	<Memo>点此记录</Memo>
+	<TitleDateFormat>yyyy年MM月dd日</TitleDateFormat>
+</root>