完善功能

电子展板/Utility/Other/RandomUtils.cs

@@ -0,0 +1,13 @@
+using System;
+
+namespace 电子展板.Utility.Other
+{
+    public class RandomUtils
+    {
+        public static int GetRandomInt(int start, int end)
+        {
+            Random rand = new Random();
+            return rand.Next(start, end);
+        }
+    }
+}