diff --git a/General/utils/CollectionsUtils.cs b/General/utils/CollectionsUtils.cs
index c43d062..cf5993c 100644
--- a/General/utils/CollectionsUtils.cs
+++ b/General/utils/CollectionsUtils.cs
@@ -1,4 +1,5 @@
-using System;
+using Microsoft.VisualBasic;
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
@@ -6,13 +7,13 @@ using System.Text;
 using System.Threading.Tasks;
 
 namespace Soul2.General.utils {
-    public class CollectionsUtils {
+    public static class CollectionsUtils {
         /// <summary>
         /// 判断非空
         /// </summary>
         /// <param name="collection">集合对象</param>
         /// <returns>是否非空</returns>
-        public static bool isNotEmpty(IEnumerable collection) {
+        public static bool isNotEmpty(this IEnumerable collection) {
             return !isEmpty(collection);
         }
 
@@ -21,7 +22,7 @@ namespace Soul2.General.utils {
         /// </summary>
         /// <param name="collection">集合对象</param>
         /// <returns>是否为空</returns>
-        public static bool isEmpty(IEnumerable collection) {
+        public static bool isEmpty(this IEnumerable collection) {
             if (collection == null) {
                 return true;
             }
@@ -30,5 +31,24 @@ namespace Soul2.General.utils {
             }
             return true;
         }
+
+        /// <summary>
+        /// 去重
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="list"></param>
+        /// <returns></returns>
+        public static List<T> duplicateRemoval<T>(this List<T> list) {
+            if (list.isNotEmpty()) {
+                var set = new HashSet<T>(list);
+                return new List<T>(set);
+            } else {
+                return list;
+            }
+        }
+
+        public static HashSet<T> toSet<T>(this IEnumerable<T> collection) {
+            return new HashSet<T>(collection);
+        }
     }
 }