Add unit test

Src/Asp.Net/SqlServerTest/SqlServerTest.csproj

@@ -97,6 +97,7 @@
     <Compile Include="Models\OrderItem.cs" />
     <Compile Include="Demo\Demo0_SqlSugarClient.cs" />
     <Compile Include="Models\ViewOrder.cs" />
+    <Compile Include="UnitTest\UCustom20.cs" />
     <Compile Include="UnitTest\UnitUpdateSubQuery.cs" />
     <Compile Include="UnitTest\UnitManyToManyDeleteNav.cs" />
     <Compile Include="UnitTest\UnitCustom12312.cs" />

Src/Asp.Net/SqlServerTest/UnitTest/Main.cs

@@ -31,6 +31,7 @@ namespace OrmTest
         }
         public static void Init()
         {
+            UCustom20.Init();
             UTran2.Init();
             UnitUpdateSubQuery.Init();
             UnitManyToManyDeleteNav.Init();

Src/Asp.Net/SqlServerTest/UnitTest/UCustom20.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OrmTest 
+{
+    public  class UCustom20
+    {
+        public static void Init() 
+        {
+            var db = NewUnitTest.Db;
+            var list = db.Queryable<Order>()
+            .Take(2)
+             .Select(i => new TestDTO
+             {
+                 SubOne = new TestSubDTO { NameOne = i.Name, NameTwo = i.Name },
+                 SubTwo = new TestSubDTO { NameOne = i.Name, NameTwo = i.Name }
+             })
+             .ToList();
+        }
+
+        public class TestDTO
+        {
+            public TestSubDTO SubOne { get; set; }
+
+            public TestSubDTO SubTwo { get; set; }
+        }
+
+        public class TestSubDTO
+        {
+            public string NameOne { get; set; }
+
+            public string NameTwo { get; set; }
+        }
+    }
+}