support for dynamic switching languages

src/Shared/HandyControlDemo_Shared/Properties/Langs/LangDecorator.tt

@@ -0,0 +1,73 @@
+<#@ template debug="false" hostspecific="false" language="C#" #>
+<#@ assembly name="System.Core" #>
+<#@ import namespace="System.Linq" #>
+<#@ import namespace="System.Collections.Generic"#>
+<#@ assembly name="$(TargetPath)" #>
+<#@ import namespace="HandyControlDemo.Properties.Langs" #>
+<#@ output extension=".cs" #>
+<#
+	var resourceType = typeof(Lang);
+    var propertyNameList = resourceType.GetProperties().Where(item => item.PropertyType == typeof(string)).Select(item => item.Name);
+    var langDic = new Dictionary<string, string>();
+    foreach(var item in propertyNameList)
+    {
+        langDic[item] = 
+        @$"/// <summary>
+        ///   查找类似 {Lang.ResourceManager.GetString(item, Lang.Culture)} 的本地化字符串。
+        /// </summary>";
+    }
+#>
+using System.ComponentModel;
+using System.Globalization;
+using HandyControl.Tools;
+
+namespace HandyControlDemo.Properties.Langs
+{
+    public class LangDecorator : INotifyPropertyChanged
+    {
+        internal static LangDecorator Instance => ResourceHelper.GetResource<LangDecorator>("DemoLangs");
+
+        private static string CultureInfoStr;
+
+        public static CultureInfo Culture
+        {
+            get => Lang.Culture;
+            set
+            {
+                if (value == null) return;
+                if (Equals(CultureInfoStr, value.EnglishName)) return;
+                Lang.Culture = value;
+                CultureInfoStr = value.EnglishName;
+
+                Instance.UpdateLangs();
+            }
+        }
+
+		private void UpdateLangs()
+        {
+<#foreach(var item in propertyNameList){#>
+			OnPropertyChanged(nameof(<#=item#>));
+<#}#>
+        }
+
+<#foreach(var item in propertyNameList){#>
+        <#=langDic[item]#>
+		public string <#=item#> => Lang.<#=item#>;
+
+<#}#>
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        protected virtual void OnPropertyChanged(string propertyName) =>
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+    }
+
+    public class LangKeys
+    {
+<#foreach(var item in propertyNameList){#>
+        <#=langDic[item]#>
+		public static string <#=item#> = nameof(<#=item#>);
+
+<#}#>
+    }
+}