diff --git a/Src/Asp.Net/OracleTest/Demos/1_Query.cs b/Src/Asp.Net/OracleTest/Demos/1_Query.cs
index 12de1fbe5..5a47ca7cc 100644
--- a/Src/Asp.Net/OracleTest/Demos/1_Query.cs
+++ b/Src/Asp.Net/OracleTest/Demos/1_Query.cs
@@ -336,6 +336,18 @@ namespace OrmTest.Demo
             var list8 = db.Queryable<Student, School, School>((st, sc, sc2) => st.SchoolId == sc.Id && sc.Id == sc2.Id)
             .OrderBy(st=>st.Id)
             .Select((st, sc, sc2) => new { st.Name, st.Id, schoolName = sc.Name, schoolName2 = sc2.Name }).ToPageList(1, 2);
+
+            var q1 = db.Queryable<Student>().Select(it => new Student()
+            {
+                 Id=it.Id,
+                 Name="a"
+            });
+            var q2 = db.Queryable<Student>().Select(it => new Student()
+            {
+                Id = it.Id,
+                Name = "b"
+            });
+            var unionAllList=db.Union(q1, q2).ToList();
         }
         public static void Funs()
         {
diff --git a/Src/Asp.Net/SqlServerTest/Demos/1_Query.cs b/Src/Asp.Net/SqlServerTest/Demos/1_Query.cs
index 0ccc7dac8..93c89c74c 100644
--- a/Src/Asp.Net/SqlServerTest/Demos/1_Query.cs
+++ b/Src/Asp.Net/SqlServerTest/Demos/1_Query.cs
@@ -539,6 +539,18 @@ namespace OrmTest.Demo
                 id=st1.Id,
                 name=st2.Name
             }).ToList();
+
+            var q1 = db.Queryable<Student>().Select(it => new Student()
+            {
+                Id = it.Id,
+                Name = "a"
+            });
+            var q2 = db.Queryable<Student>().Select(it => new Student()
+            {
+                Id = it.Id,
+                Name = "b"
+            });
+            var unionAllList = db.Union(q1, q2).ToList();
         }
         public static void Funs()
         {
diff --git a/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs b/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
index dc20c7321..031ccfa85 100644
--- a/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
+++ b/Src/Asp.Net/SqlSugar/Utilities/UtilMethods.cs
@@ -78,7 +78,7 @@ namespace SqlSugar
                     //Compatible with.NET CORE parameters case
                     var name = parameter.ParameterName;
                     string newName = name +append+ addIndex;
-                    appendSql = appendSql.Replace(name, newName);
+                    appendSql =Regex.Replace(appendSql,name,newName,RegexOptions.IgnoreCase);
                     parameter.ParameterName = newName;
                 }
             }