From fd8265c8d4cb768a363d5ad28568f5fa514a3dc7 Mon Sep 17 00:00:00 2001
From: sunkaixuan <610262374@qq.com>
Date: Wed, 20 Aug 2025 18:58:45 +0800
Subject: [PATCH] Add demo

---
 Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryWhere.cs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryWhere.cs b/Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryWhere.cs
index e2d26c856..a56f4a804 100644
--- a/Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryWhere.cs
+++ b/Src/Asp.NetCore2/MongoDbTest/UnitTest/QueryWhere.cs
@@ -97,7 +97,13 @@ namespace MongoDbTest
             var list77 = db.Queryable<Student>()
                 .Where(it=>"ac"== it.Name.Substring(1, it.SchoolId))
                 .Select(it => new { it.SchoolId,  name =it.Name.Substring(1, it.SchoolId) }).ToList();
-            if (list77.First().name != "ac") Cases.ThrowUnitError();
+            if (list77.First().name != "ac") Cases.ThrowUnitError(); 
+
+            var name = "acbd"; // 
+            var list78 = db.Queryable<Student>()
+             .Where(it => "ac" == name.Substring(0, it.SchoolId))
+             .ToList();
+            if (!list78.Any(it => "ac" == name.Substring(0, it.SchoolId))) Cases.ThrowUnitError();
         }
 
         private static void ValidateStudentData(SqlSugar.SqlSugarClient db)