diff --git a/FreeSql.DbContext/FreeSql.DbContext.xml b/FreeSql.DbContext/FreeSql.DbContext.xml
index 2d6d3409..b3c14870 100644
--- a/FreeSql.DbContext/FreeSql.DbContext.xml
+++ b/FreeSql.DbContext/FreeSql.DbContext.xml
@@ -130,13 +130,6 @@
             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
@@ -509,14 +502,5 @@
             <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.Tests/FreeSql.Tests/Issues/521.cs b/FreeSql.Tests/FreeSql.Tests/Issues/521.cs
index 890ca1f8..6e338e66 100644
--- a/FreeSql.Tests/FreeSql.Tests/Issues/521.cs
+++ b/FreeSql.Tests/FreeSql.Tests/Issues/521.cs
@@ -5,6 +5,7 @@ using System.Collections.Generic;
 using System.ComponentModel;
 using System.ComponentModel.DataAnnotations;
 using System.Diagnostics;
+using System.Reflection;
 using System.Text;
 using System.Threading;
 using Xunit;
@@ -17,6 +18,18 @@ namespace FreeSql.Tests.Issues
         public void SelectTest()
         {
             IFreeSql fsql = g.sqlserver;
+
+            //fsql.Aop.AuditValue += (s, e) => {
+            //    if (e.Column.CsType == typeof(long)
+            //        && e.Property.GetCustomAttribute<SnowflakeAttribute>(false) != null
+            //        && e.Value?.ToString() == "0")
+            //    {
+            //        e.Value = 1;
+            //    }
+
+            //};
+
+
             fsql.Delete<ts521>().Where("1=1").ExecuteAffrows();
             fsql.Insert(new ts521 { ID = 1000000000000000001 }).ExecuteAffrows();
 
@@ -28,6 +41,7 @@ namespace FreeSql.Tests.Issues
         class ts521
         {
             [Key]
+            [Snowflake]
             public long ID { get; set; }
 
             [Description("名字")]
@@ -44,5 +58,6 @@ namespace FreeSql.Tests.Issues
             [Column(IsVersion = true, InsertValueSql = "1")]
             public long Version { get; set; }
         }
+        public class SnowflakeAttribute: Attribute { }
     }
 }
diff --git a/FreeSql/Internal/CommonProvider/UpdateProvider.cs b/FreeSql/Internal/CommonProvider/UpdateProvider.cs
index 5d579daf..14fb2985 100644
--- a/FreeSql/Internal/CommonProvider/UpdateProvider.cs
+++ b/FreeSql/Internal/CommonProvider/UpdateProvider.cs
@@ -374,7 +374,7 @@ namespace FreeSql.Internal.CommonProvider
                             changedDict.Add(col.Attribute.Name, true);
                     }
                     if (val == null && col.Attribute.MapType == typeof(string) && col.Attribute.IsNullable == false)
-                        col.SetValue(data, val = "");
+                        col.SetValue(d, val = "");
                 }
             }
         }