修复bug和新增部分功能

ConsoleApp/Program.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -15,6 +16,8 @@ namespace ConsoleApp
             string str = "";
             double a = 10.0;
             double b = 100;
+
+            Debug.Assert(a == b);
             //确保str满足条件才能继续执行，不满足即抛出异常
             Guard.IsNotNullOrEmpty(str);//抛出异常
             Guard.IsLessThan(a,b);