diff --git a/Examples/base_entity/Program.cs b/Examples/base_entity/Program.cs
index 4ce60e3a..946fc5ca 100644
--- a/Examples/base_entity/Program.cs
+++ b/Examples/base_entity/Program.cs
@@ -69,6 +69,24 @@ namespace base_entity
             public Sys_reg_user RegUser { get; set; }
         }
 
+        public class tttorder
+        {
+            [Column(IsPrimary = true)]
+            public long Id { get; set; }
+            public string Title { get; set; }
+            public int Quantity { get; set; }
+            public decimal Price { get; set; }
+
+
+            public tttorder(string title, int quantity, decimal price)
+            {
+                Id = DateTime.Now.Ticks;
+                Title = title;
+                Quantity = quantity;
+                Price = price;
+            }
+        }
+
         static void Main(string[] args)
         {
             #region 初始化 IFreeSql
@@ -107,6 +125,11 @@ namespace base_entity
             BaseEntity.Initialization(fsql, () => _asyncUow.Value);
             #endregion
 
+            fsql.Insert(new tttorder("xx1", 1, 10)).ExecuteAffrows();
+            fsql.Insert(new tttorder("xx2", 2, 20)).ExecuteAffrows();
+
+            var tttorders = fsql.Select<tttorder>().Limit(2).ToList();
+
             var tsql1 = fsql.Select<Sys_reg_user>()
                 .Include(a => a.Owner)
                 .Where(a => a.UnionId == "xxx")
diff --git a/Examples/base_entity/base_entity.csproj b/Examples/base_entity/base_entity.csproj
index 201c18db..b2bcd550 100644
--- a/Examples/base_entity/base_entity.csproj
+++ b/Examples/base_entity/base_entity.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
diff --git a/FreeSql.DbContext/FreeSql.DbContext.xml b/FreeSql.DbContext/FreeSql.DbContext.xml
index d198eb6c..ce9ce69d 100644
--- a/FreeSql.DbContext/FreeSql.DbContext.xml
+++ b/FreeSql.DbContext/FreeSql.DbContext.xml
@@ -130,6 +130,13 @@
             清空状态数据
             </summary>
         </member>
+        <member name="M:FreeSql.DbSet`1.RemoveAsync(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})">
+            <summary>
+            根据 lambda 条件删除数据
+            </summary>
+            <param name="predicate"></param>
+            <returns></returns>
+        </member>
         <member name="M:FreeSql.DbSet`1.Add(`0)">
             <summary>
             添加
@@ -525,5 +532,14 @@
             <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>
diff --git a/FreeSql/Extensions/FreeSqlGlobalExtensions.cs b/FreeSql/Extensions/FreeSqlGlobalExtensions.cs
index d8657041..c4534b31 100644
--- a/FreeSql/Extensions/FreeSqlGlobalExtensions.cs
+++ b/FreeSql/Extensions/FreeSqlGlobalExtensions.cs
@@ -151,7 +151,7 @@ public static partial class FreeSqlGlobalExtensions
     {
         var ret = _dicInternalGetTypeConstructor0OrFirst.GetOrAdd(that, tp =>
             tp.GetConstructor(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic, null, new Type[0], null) ??
-            tp.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic).FirstOrDefault());
+            tp.GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic).OrderBy(a => a.IsPublic ? 0 : 1).FirstOrDefault());
         if (ret == null && isThrow) throw new ArgumentException($"{that.FullName} 类型无方法访问构造函数");
         return ret;
     }