support for .NET framework 3.5

Still have bugs

Net35/HandyControl_Net35/Tools/Helper/ResourceHelper.cs

@@ -0,0 +1,89 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Windows;
+using HandyControl.Data;
+
+namespace HandyControl.Tools
+{
+    /// <summary>
+    ///     资源帮助类
+    /// </summary>
+    public class ResourceHelper
+    {
+        /// <summary>
+        ///     获取字符串
+        /// </summary>
+        /// <param name="key"></param>
+        /// <returns></returns>
+        public static string GetString(string key) => Application.Current.TryFindResource(key) as string;
+
+        /// <summary>
+        ///     获取字符串
+        /// </summary>
+        /// <param name="separator"></param>
+        /// <param name="keyArr"></param>
+        /// <returns></returns>
+        public static string GetString(string separator = ";", params string[] keyArr) =>
+            string.Join(separator, keyArr.Select(key => Application.Current.TryFindResource(key) as string).ToArray());
+
+        /// <summary>
+        ///     获取字符串
+        /// </summary>
+        /// <param name="keyArr"></param>
+        /// <returns></returns>
+        public static List<string> GetStringList(params string[] keyArr) => keyArr.Select(key => Application.Current.TryFindResource(key) as string).ToList();
+
+        /// <summary>
+        ///     获取资源
+        /// </summary>
+        /// <param name="key"></param>
+        /// <returns></returns>
+        public static T GetResource<T>(string key)
+        {
+            if (Application.Current.TryFindResource(key) is T resource)
+            {
+                return resource;
+            }
+
+            return default(T);
+        }
+
+        /// <summary>
+        ///     获取HandyControl皮肤
+        /// </summary>
+        /// <param name="skin"></param>
+        /// <returns></returns>
+        public static ResourceDictionary GetSkin(SkinType skin) => new ResourceDictionary
+        {
+            Source = new Uri($"pack://application:,,,/HandyControl;component/Themes/Skin{skin.ToString()}.xaml")
+        };
+
+        /// <summary>
+        ///     获取皮肤
+        /// </summary>
+        /// <param name="assembly"></param>
+        /// <param name="themePath"></param>
+        /// <param name="skin"></param>
+        /// <returns></returns>
+        public static ResourceDictionary GetSkin(Assembly assembly, string themePath, SkinType skin)
+        {
+            try
+            {
+                var uri = new Uri($"pack://application:,,,/{assembly.GetName().Name};component/{themePath}/Skin{skin.ToString()}.xaml");
+                return new ResourceDictionary
+                {
+                    Source = uri
+                };
+            }
+            catch
+            {
+                return new ResourceDictionary
+                {
+                    Source = new Uri($"pack://application:,,,/{assembly.GetName().Name};component/{themePath}/Skin{SkinType.Default.ToString()}.xaml")
+                };
+            }        
+        }
+    }
+}