Update Cache Demos

Src/Asp.Net/ExtensionsDemo/Models/Student.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using SqlSugar;
+using System.Linq.Expressions;
+
+namespace ExtensionsDemo
+{
+    [SugarTable("STudent")]
+    public class Student
+    {
+        [SugarColumn(IsPrimaryKey = true, IsIdentity = true, ColumnName = "ID")]
+        public int Id { get; set; }
+        public int? SchoolId { get; set; }
+        public string Name { get; set; }
+        public DateTime? CreateTime { get; set; }
+        [SugarColumn(IsIgnore=true)]
+        public int TestId { get; set; }
+    }
+ 
+}