diff --git a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
index faaf92d60..6f8e64eb5 100644
--- a/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
+++ b/Src/Asp.Net/SqlSugar/Abstract/SqlBuilderProvider/QueryBuilder.cs
@@ -441,12 +441,12 @@ namespace SqlSugar
             return string.Format(temp, sql.ToString(), (pageIndex - 1) * pageSize + 1, pageIndex * pageSize);
         }
 
-        public virtual string GetSelectByItems(List<KeyValuePair<string, object>> items)
+        public virtual string GetSelectByItems(List<KeyValuePair<string, JoinMapper>> items)
         {
             var array = items.Select(it => {
-                dynamic dynamicObj = this.Context.Utilities.DeserializeObject<dynamic>(this.Context.Utilities.SerializeObject(it.Value));
-                var dbName = Builder.GetTranslationColumnName((string)(dynamicObj.dbName));
-                var asName = Builder.GetTranslationColumnName((string)(dynamicObj.asName));
+                JoinMapper dynamicObj = it.Value;
+                var dbName = Builder.GetTranslationColumnName(dynamicObj.DbName);
+                var asName = Builder.GetTranslationColumnName(dynamicObj.AsName);
                 return string.Format("{0}.{1} AS {2}", it.Key, dbName, asName);
             });
             return string.Join(",", array);
diff --git a/Src/Asp.Net/SqlSugar/Entities/JoinMapper.cs b/Src/Asp.Net/SqlSugar/Entities/JoinMapper.cs
index b45d7729e..efe4f965a 100644
--- a/Src/Asp.Net/SqlSugar/Entities/JoinMapper.cs
+++ b/Src/Asp.Net/SqlSugar/Entities/JoinMapper.cs
@@ -6,9 +6,9 @@ using System.Threading.Tasks;
 
 namespace SqlSugar 
 {
-    internal class JoinMapper
+    public class JoinMapper
     {
-        public string asName { get; set; }
-        public string dbName { get; set; }
+        public string AsName { get; set; }
+        public string DbName { get; set; }
     }
 }
diff --git a/Src/Asp.Net/SqlSugar/Infrastructure/Mapper.cs b/Src/Asp.Net/SqlSugar/Infrastructure/Mapper.cs
index 0577d20d0..ef6cc495b 100644
--- a/Src/Asp.Net/SqlSugar/Infrastructure/Mapper.cs
+++ b/Src/Asp.Net/SqlSugar/Infrastructure/Mapper.cs
@@ -19,7 +19,7 @@ namespace SqlSugar
             string result = string.Empty;
             var veiwModel = _context.EntityMaintenance.GetEntityInfo<TResult>();
             var exp = (queryBuilder.JoinExpression as LambdaExpression);
-            List<KeyValuePair<string, object>> selectItems = new List<KeyValuePair<string, object>>();
+            List<KeyValuePair<string, JoinMapper>> selectItems = new List<KeyValuePair<string, JoinMapper>>();
             var exParsmeters = exp.Parameters.Select(it => new { shortName = it.Name, type = it.Type }).ToList();
             foreach (var viewColumns in veiwModel.Columns)
             {
@@ -54,10 +54,10 @@ namespace SqlSugar
                     {
                         JoinMapper joinMapper = new JoinMapper()
                         {
-                             asName=viewColumns.PropertyName,
-                             dbName=columnInfo.it.DbColumnName
+                             AsName=viewColumns.PropertyName,
+                             DbName=columnInfo.it.DbColumnName
                         };
-                        selectItems.Add(new KeyValuePair<string, object>(expPars.shortName,joinMapper));
+                        selectItems.Add(new KeyValuePair<string, JoinMapper>(expPars.shortName,joinMapper));
                         isbreak = true;
                     }
                 }