- 完善 WithTempQuery + FromQuery 分组嵌套；

FreeSql.DbContext/FreeSql.DbContext.xml

@@ -800,5 +800,14 @@
             <param name="that"></param>
             <returns></returns>
         </member>
+        <member name="M:Microsoft.Extensions.DependencyInjection.FreeSqlRepositoryDependencyInjection.AddFreeRepository(Microsoft.Extensions.DependencyInjection.IServiceCollection,System.Action{FreeSql.FluentDataFilter},System.Reflection.Assembly[])">
+            <summary>
+            批量注入 Repository，可以参考代码自行调整
+            </summary>
+            <param name="services"></param>
+            <param name="globalDataFilter"></param>
+            <param name="assemblies"></param>
+            <returns></returns>
+        </member>
     </members>
 </doc>

FreeSql.Tests/FreeSql.Tests/SqlServer/Curd/SqlServerSelectWithTempQueryTest.cs

@@ -672,6 +672,47 @@ WHERE (a.[rownum] = 1) AND ((a.[Nickname] = N'name03' OR a.[Nickname] = N'name02
             Assert.Equal(list10[1].rownum, 1);
             Assert.Equal(list10[1].Id, 0);
             Assert.Null(list10[1].remark);
+
+
+            var sql11 = fsql.Select<TwoTablePartitionBy_User>()
+                .WithTempQuery(a => new
+                {
+                    user = a,
+                    rownum = SqlExt.RowNumber().Over().PartitionBy(a.Nickname).OrderBy(a.Id).ToValue()
+                })
+                .Where(a => a.rownum == 1)
+                .FromQuery(fsql.Select<TwoTablePartitionBy_UserExt>().Where(b => b.UserId > 0).GroupBy(b => b.UserId).WithTempQuery(b => new { uid = b.Key, rownum = b.Sum(b.Value.UserId) }))
+                .InnerJoin((a, b) => a.user.Id == b.uid)
+                .Where((a, b) => a.user.Nickname == "name03" || a.user.Nickname == "name02")
+                .ToSql((a, b) => new TwoTablePartitionBy_UserDto());
+            var assertSql11 = @"SELECT a.[rownum] as1 
+FROM ( 
+    SELECT a.[Id], a.[Nickname], row_number() over( partition by a.[Nickname] order by a.[Id]) [rownum] 
+    FROM [TwoTablePartitionBy_User] a ) a 
+INNER JOIN ( SELECT a.[UserId] [uid], sum(a.[UserId]) [rownum] 
+    FROM [TwoTablePartitionBy_UserExt] a 
+    WHERE (a.[UserId] > 0) 
+    GROUP BY a.[UserId] ) b ON a.[Id] = b.[uid] 
+WHERE (a.[rownum] = 1) AND ((a.[Nickname] = N'name03' OR a.[Nickname] = N'name02'))";
+            Assert.Equal(sql11, assertSql11);
+            var list11 = fsql.Select<TwoTablePartitionBy_User>()
+                .WithTempQuery(a => new
+                {
+                    user = a,
+                    rownum = SqlExt.RowNumber().Over().PartitionBy(a.Nickname).OrderBy(a.Id).ToValue()
+                })
+                .Where(a => a.rownum == 1)
+                .FromQuery(fsql.Select<TwoTablePartitionBy_UserExt>().Where(b => b.UserId > 0).GroupBy(b => b.UserId).WithTempQuery(b => new { uid = b.Key, rownum = b.Sum(b.Value.UserId) }))
+                .InnerJoin((a, b) => a.user.Id == b.uid)
+                .Where((a, b) => a.user.Nickname == "name03" || a.user.Nickname == "name02")
+                .ToList<TwoTablePartitionBy_UserDto>();
+            Assert.Equal(list11.Count, 2);
+            Assert.Equal(list11[0].rownum, 1);
+            Assert.Equal(list11[0].Id, 0);
+            Assert.Null(list11[0].remark);
+            Assert.Equal(list11[1].rownum, 1);
+            Assert.Equal(list11[1].Id, 0);
+            Assert.Null(list11[1].remark);
         }
         class TwoTablePartitionBy_User
         {

FreeSql/FreeSql.xml

@@ -3324,6 +3324,177 @@
             <param name="parms"></param>
             <returns></returns>
         </member>
+        <member name="M:FreeSql.IAdo.ExecuteConnectTestAsync(System.Int32,System.Threading.CancellationToken)">
+            <summary>
+            测试数据库是否连接正确，本方法执行如下命令：<para></para>
+            MySql/SqlServer/PostgreSQL/达梦/人大金仓/神通: SELECT 1<para></para>
+            Oracle: SELECT 1 FROM dual<para></para>
+            </summary>
+            <param name="commandTimeout">命令超时设置(秒)</param>
+            <param name="cancellationToken"></param>
+            <returns>true: 成功, false: 失败</returns>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteReaderAsync(System.Func{FreeSql.Internal.Model.FetchCallbackArgs{System.Data.Common.DbDataReader},System.Threading.Tasks.Task},System.Data.CommandType,System.String,System.Data.Common.DbParameter[],System.Threading.CancellationToken)">
+            <summary>
+            查询，若使用读写分离，查询【从库】条件cmdText.StartsWith("SELECT ")，否则查询【主库】
+            </summary>
+            <param name="readerHander"></param>
+            <param name="cmdType"></param>
+            <param name="cmdText"></param>
+            <param name="cmdParms"></param>
+            <param name="cancellationToken"></param>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteReaderAsync(System.Func{FreeSql.Internal.Model.FetchCallbackArgs{System.Data.Common.DbDataReader},System.Threading.Tasks.Task},System.String,System.Object,System.Threading.CancellationToken)">
+            <summary>
+            查询，ExecuteReaderAsync(dr => {}, "select * from user where age > @age", new { age = 25 })<para></para>
+            提示：parms 参数还可以传 Dictionary&lt;string, object&gt;
+            </summary>
+            <param name="readerHander"></param>
+            <param name="cmdText"></param>
+            <param name="parms"></param>
+            <param name="cancellationToken"></param>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteArrayAsync(System.Data.CommandType,System.String,System.Data.Common.DbParameter[],System.Threading.CancellationToken)">
+            <summary>
+            查询
+            </summary>
+            <param name="cmdType"></param>
+            <param name="cmdText"></param>
+            <param name="cmdParms"></param>
+            <param name="cancellationToken"></param>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteArrayAsync(System.String,System.Object,System.Threading.CancellationToken)">
+            <summary>
+            查询，ExecuteArrayAsync("select * from user where age > @age", new { age = 25 })<para></para>
+            提示：parms 参数还可以传 Dictionary&lt;string, object&gt;
+            </summary>
+            <param name="cmdText"></param>
+            <param name="parms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteDataSetAsync(System.Data.CommandType,System.String,System.Data.Common.DbParameter[],System.Threading.CancellationToken)">
+            <summary>
+            查询
+            </summary>
+            <param name="cmdType"></param>
+            <param name="cmdText"></param>
+            <param name="cmdParms"></param>
+            <param name="cancellationToken"></param>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteDataSetAsync(System.String,System.Object,System.Threading.CancellationToken)">
+            <summary>
+            查询，ExecuteDataSetAsync("select * from user where age > @age; select 2", new { age = 25 })<para></para>
+            提示：parms 参数还可以传 Dictionary&lt;string, object&gt;
+            </summary>
+            <param name="cmdText"></param>
+            <param name="parms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteDataTableAsync(System.Data.CommandType,System.String,System.Data.Common.DbParameter[],System.Threading.CancellationToken)">
+            <summary>
+            查询
+            </summary>
+            <param name="cmdType"></param>
+            <param name="cmdText"></param>
+            <param name="cmdParms"></param>
+            <param name="cancellationToken"></param>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteDataTableAsync(System.String,System.Object,System.Threading.CancellationToken)">
+            <summary>
+            查询，ExecuteDataTableAsync("select * from user where age > @age", new { age = 25 })<para></para>
+            提示：parms 参数还可以传 Dictionary&lt;string, object&gt;
+            </summary>
+            <param name="cmdText"></param>
+            <param name="parms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteNonQueryAsync(System.Data.CommandType,System.String,System.Data.Common.DbParameter[],System.Threading.CancellationToken)">
+            <summary>
+            在【主库】执行
+            </summary>
+            <param name="cmdType"></param>
+            <param name="cmdText"></param>
+            <param name="cmdParms"></param>
+            <param name="cancellationToken"></param>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteNonQueryAsync(System.String,System.Object,System.Threading.CancellationToken)">
+            <summary>
+            在【主库】执行，ExecuteNonQueryAsync("delete from user where age > @age", new { age = 25 })<para></para>
+            提示：parms 参数还可以传 Dictionary&lt;string, object&gt;
+            </summary>
+            <param name="cmdText"></param>
+            <param name="parms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteScalarAsync(System.Data.CommandType,System.String,System.Data.Common.DbParameter[],System.Threading.CancellationToken)">
+            <summary>
+            在【主库】执行
+            </summary>
+            <param name="cmdType"></param>
+            <param name="cmdText"></param>
+            <param name="cmdParms"></param>
+            <param name="cancellationToken"></param>
+        </member>
+        <member name="M:FreeSql.IAdo.ExecuteScalarAsync(System.String,System.Object,System.Threading.CancellationToken)">
+            <summary>
+            在【主库】执行，ExecuteScalarAsync("select 1 from user where age > @age", new { age = 25 })<para></para>
+            提示：parms 参数还可以传 Dictionary&lt;string, object&gt;
+            </summary>
+            <param name="cmdText"></param>
+            <param name="parms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.IAdo.QueryAsync``1(System.Data.CommandType,System.String,System.Data.Common.DbParameter[],System.Threading.CancellationToken)">
+            <summary>
+            执行SQL返回对象集合，QueryAsync&lt;User&gt;("select * from user where age > @age", new SqlParameter { ParameterName = "age", Value = 25 })
+            </summary>
+            <typeparam name="T"></typeparam>
+            <param name="cmdType"></param>
+            <param name="cmdText"></param>
+            <param name="cmdParms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.IAdo.QueryAsync``1(System.String,System.Object,System.Threading.CancellationToken)">
+            <summary>
+            执行SQL返回对象集合，QueryAsync&lt;User&gt;("select * from user where age > @age", new { age = 25 })<para></para>
+            提示：parms 参数还可以传 Dictionary&lt;string, object&gt;
+            </summary>
+            <typeparam name="T"></typeparam>
+            <param name="cmdText"></param>
+            <param name="parms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.IAdo.QueryAsync``2(System.Data.CommandType,System.String,System.Data.Common.DbParameter[],System.Threading.CancellationToken)">
+            <summary>
+            执行SQL返回对象集合，Query&lt;User&gt;("select * from user where age > @age; select * from address", new SqlParameter { ParameterName = "age", Value = 25 })
+            </summary>
+            <typeparam name="T1"></typeparam>
+            <typeparam name="T2"></typeparam>
+            <param name="cmdType"></param>
+            <param name="cmdText"></param>
+            <param name="cmdParms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
+        <member name="M:FreeSql.IAdo.QueryAsync``2(System.String,System.Object,System.Threading.CancellationToken)">
+            <summary>
+            执行SQL返回对象集合，Query&lt;User, Address&gt;("select * from user where age > @age; select * from address", new { age = 25 })<para></para>
+            提示：parms 参数还可以传 Dictionary&lt;string, object&gt;
+            </summary>
+            <typeparam name="T1"></typeparam>
+            <typeparam name="T2"></typeparam>
+            <param name="cmdText"></param>
+            <param name="parms"></param>
+            <param name="cancellationToken"></param>
+            <returns></returns>
+        </member>
         <member name="E:FreeSql.IAop.ParseExpression">
             <summary>
             可自定义解析表达式
@@ -4347,6 +4518,12 @@
             <param name="timeout">超时</param>
             <returns></returns>
         </member>
+        <member name="M:FreeSql.Internal.ObjectPool.IObjectPool`1.GetAsync">
+            <summary>
+            获取资源
+            </summary>
+            <returns></returns>
+        </member>
         <member name="M:FreeSql.Internal.ObjectPool.IObjectPool`1.Return(FreeSql.Internal.ObjectPool.Object{`0},System.Boolean)">
             <summary>
             使用完毕后，归还资源
@@ -4422,6 +4599,12 @@
             </summary>
             <param name="obj">资源对象</param>
         </member>
+        <member name="M:FreeSql.Internal.ObjectPool.IPolicy`1.OnGetAsync(FreeSql.Internal.ObjectPool.Object{`0})">
+            <summary>
+            从对象池获取对象成功的时候触发，通过该方法统计或初始化对象
+            </summary>
+            <param name="obj">资源对象</param>
+        </member>
         <member name="M:FreeSql.Internal.ObjectPool.IPolicy`1.OnReturn(FreeSql.Internal.ObjectPool.Object{`0})">
             <summary>
             归还对象给对象池的时候触发
@@ -5863,222 +6046,3 @@
         </member>
     </members>
 </doc>
-ystem.Boolean}})">
-            <summary>
-            使用 and 拼接两个 lambda 表达式
-            </summary>
-            <param name="exp1"></param>
-            <param name="condition">true 时生效</param>
-            <param name="exp2"></param>
-            <returns></returns>
-        </member>
-        <member name="M:System.Linq.Expressions.LambadaExpressionExtensions.Or``4(System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,System.Boolean}},System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,System.Boolean}})">
-            <summary>
-            使用 or 拼接两个 lambda 表达式
-            </summary>
-            <returns></returns>
-        </member>
-        <member name="M:System.Linq.Expressions.LambadaExpressionExtensions.Or``4(System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,System.Boolean}},System.Boolean,System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,System.Boolean}})">
-            <summary>
-            使用 or 拼接两个 lambda 表达式
-            </summary>
-            <param name="exp1"></param>
-            <param name="condition">true 时生效</param>
-            <param name="exp2"></param>
-            <returns></returns>
-        </member>
-        <member name="M:System.Linq.Expressions.LambadaExpressionExtensions.Not``4(System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,System.Boolean}},System.Boolean)">
-            <summary>
-            将 lambda 表达式取反
-            </summary>
-            <param name="exp"></param>
-            <param name="condition">true 时生效</param>
-            <returns></returns>
-        </member>
-        <member name="M:System.Linq.Expressions.LambadaExpressionExtensions.And``5(System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}},System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}})">
-            <summary>
-            使用 and 拼接两个 lambda 表达式
-            </summary>
-            <returns></returns>
-        </member>
-        <member name="M:System.Linq.Expressions.LambadaExpressionExtensions.And``5(System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}},System.Boolean,System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}})">
-            <summary>
-            使用 and 拼接两个 lambda 表达式
-            </summary>
-            <param name="exp1"></param>
-            <param name="condition">true 时生效</param>
-            <param name="exp2"></param>
-            <returns></returns>
-        </member>
-        <member name="M:System.Linq.Expressions.LambadaExpressionExtensions.Or``5(System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}},System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}})">
-            <summary>
-            使用 or 拼接两个 lambda 表达式
-            </summary>
-            <returns></returns>
-        </member>
-        <member name="M:System.Linq.Expressions.LambadaExpressionExtensions.Or``5(System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}},System.Boolean,System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}})">
-            <summary>
-            使用 or 拼接两个 lambda 表达式
-            </summary>
-            <param name="exp1"></param>
-            <param name="condition">true 时生效</param>
-            <param name="exp2"></param>
-            <returns></returns>
-        </member>
-        <member name="M:System.Linq.Expressions.LambadaExpressionExtensions.Not``5(System.Linq.Expressions.Expression{System.Func{``0,``1,``2,``3,``4,System.Boolean}},System.Boolean)">
-            <summary>
-            将 lambda 表达式取反
-            </summary>
-            <param name="exp"></param>
-            <param name="condition">true 时生效</param>
-            <returns></returns>
-        </member>
-        <member name="M:FreeUtil.NewMongodbId">
-            <summary>
-            生成类似Mongodb的ObjectId有序、不重复Guid
-            </summary>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Insert``1">
-            <summary>
-            插入数据
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Insert``1(``0)">
-            <summary>
-            插入数据，传入实体
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <param name="source"></param>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Insert``1(``0[])">
-            <summary>
-            插入数据，传入实体数组
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <param name="source"></param>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Insert``1(System.Collections.Generic.List{``0})">
-            <summary>
-            插入数据，传入实体集合
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <param name="source"></param>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Insert``1(System.Collections.Generic.IEnumerable{``0})">
-            <summary>
-            插入数据，传入实体集合
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <param name="source"></param>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.InsertOrUpdate``1">
-            <summary>
-            插入或更新数据，此功能依赖数据库特性（低版本可能不支持），参考如下：<para></para>
-            MySql 5.6+: on duplicate key update<para></para>
-            PostgreSQL 9.4+: on conflict do update<para></para>
-            SqlServer 2008+: merge into<para></para>
-            Oracle 11+: merge into<para></para>
-            Sqlite: replace into<para></para>
-            达梦: merge into<para></para>
-            人大金仓：on conflict do update<para></para>
-            神通：merge into<para></para>
-            MsAccess：不支持<para></para>
-            注意区别：FreeSql.Repository 仓储也有 InsertOrUpdate 方法（不依赖数据库特性）
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Update``1">
-            <summary>
-            修改数据
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Update``1(System.Object)">
-            <summary>
-            修改数据，传入动态条件，如：主键值 | new[]{主键值1,主键值2} | TEntity1 | new[]{TEntity1,TEntity2} | new{id=1}
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <param name="dywhere">主键值、主键值集合、实体、实体集合、匿名对象、匿名对象集合</param>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Select``1">
-            <summary>
-            查询数据
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Select``1(System.Object)">
-            <summary>
-            查询数据，传入动态条件，如：主键值 | new[]{主键值1,主键值2} | TEntity1 | new[]{TEntity1,TEntity2} | new{id=1}
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <param name="dywhere">主键值、主键值集合、实体、实体集合、匿名对象、匿名对象集合</param>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Delete``1">
-            <summary>
-            删除数据
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Delete``1(System.Object)">
-            <summary>
-            删除数据，传入动态条件，如：主键值 | new[]{主键值1,主键值2} | TEntity1 | new[]{TEntity1,TEntity2} | new{id=1}
-            </summary>
-            <typeparam name="T1"></typeparam>
-            <param name="dywhere">主键值、主键值集合、实体、实体集合、匿名对象、匿名对象集合</param>
-            <returns></returns>
-        </member>
-        <member name="M:IFreeSql.Transaction(System.Action)">
-            <summary>
-            开启事务（不支持异步）<para></para>
-            v1.5.0 关闭了线程事务超时自动提交的机制
-            </summary>
-            <param name="handler">事务体 () => {}</param>
-        </member>
-        <member name="M:IFreeSql.Transaction(System.Data.IsolationLevel,System.Action)">
-            <summary>
-            开启事务（不支持异步）<para></para>
-            v1.5.0 关闭了线程事务超时自动提交的机制
-            </summary>
-            <param name="isolationLevel"></param>
-            <param name="handler">事务体 () => {}</param>
-        </member>
-        <member name="P:IFreeSql.Ado">
-            <summary>
-            数据库访问对象
-            </summary>
-        </member>
-        <member name="P:IFreeSql.Aop">
-            <summary>
-            所有拦截方法都在这里
-            </summary>
-        </member>
-        <member name="P:IFreeSql.CodeFirst">
-            <summary>
-            CodeFirst 模式开发相关方法
-            </summary>
-        </member>
-        <member name="P:IFreeSql.DbFirst">
-            <summary>
-            DbFirst 模式开发相关方法
-            </summary>
-        </member>
-        <member name="P:IFreeSql.GlobalFilter">
-            <summary>
-            全局过滤设置，可默认附加为 Select/Update/Delete 条件
-            </summary>
-        </member>
-    </members>
-</doc>

FreeSql/Internal/CommonExpression.cs

@@ -242,23 +242,26 @@ namespace FreeSql.Internal
                         if (diymemexp != null && exp is MemberExpression expMem2 && expMem2.Member.Name == "Key" && expMem2.Expression.Type.FullName.StartsWith("FreeSql.ISelectGroupingAggregate`"))
                         {
                             field.Append(diymemexp._field);
+                            string dbNestedField = null;
                             if (diymemexp._map.Childs.Any() == false) //处理 GroupBy(a => a.Title) ToSql(g => new { tit = a.Key }, FieldAliasOptions.AsProperty) 问题
                             {
                                 if (index >= 0)
                                 {
-                                    parent.DbNestedField = $"as{++index}";
+                                    dbNestedField = $"as{++index}";
-                                    field.Append(_common.FieldAsAlias(parent.DbNestedField));
+                                    field.Append(_common.FieldAsAlias(dbNestedField));
                                 }
                                 else if (string.IsNullOrEmpty(parent.CsName) == false)
                                 {
-                                    parent.DbNestedField = GetFieldAsCsName(parent.CsName);
+                                    dbNestedField = GetFieldAsCsName(parent.CsName);
-                                    if (index == ReadAnonymousFieldAsCsName && diymemexp._field.EndsWith(parent.DbNestedField, StringComparison.CurrentCultureIgnoreCase) == false) //DbField 和 CsName 相同的时候，不处理
+                                    if (index == ReadAnonymousFieldAsCsName && diymemexp._field.EndsWith(dbNestedField, StringComparison.CurrentCultureIgnoreCase) == false) //DbField 和 CsName 相同的时候，不处理
-                                        field.Append(_common.FieldAsAlias(parent.DbNestedField));
+                                        field.Append(_common.FieldAsAlias(dbNestedField));
                                 }
                             }
                             var parentProp = parent.Property;
-                            diymemexp._map.CopyTo(parent);
+                            diymemexp._map.CopyTo(parent); //可能会清空 parent.DbNestedField、CsName 值
                             parent.Property = parentProp; //若不加此行，会引用 GroupBy(..).ToList(a => new Dto { key = a.Key }) null 错误，CopyTo 之后 Property 变为 null
+                            if (string.IsNullOrWhiteSpace(dbNestedField) == false)
+                                parent.DbNestedField = dbNestedField;
                             return false;
                         }
                         if (parent.CsType == null) parent.CsType = exp.Type;