Merge pull request '修复 上线率为分析原因' (#18) from dev into staging

Reviewed-on: #18

Learn.Archives.Core/Model/ExamClassTag.cs

@@ -66,7 +66,10 @@ namespace Learn.Archives.Core.Model
         /// 上线率
         /// </summary>
         [SugarColumn(IsIgnore = true)]
-        public decimal OnLineRate => OnLineCount / PeopleCount;
+        public decimal OnLineRate => (decimal)OnLineCount / (decimal)PeopleCount;
+        /// <summary>
+        /// 总人数
+        /// </summary>
         public int PeopleCount { get; set; }
         /// <summary>
         /// 上线人数