diff --git a/FreeSql.DbContext/FreeSql.DbContext.xml b/FreeSql.DbContext/FreeSql.DbContext.xml
index 9c6cd88b..743835e4 100644
--- a/FreeSql.DbContext/FreeSql.DbContext.xml
+++ b/FreeSql.DbContext/FreeSql.DbContext.xml
@@ -532,5 +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.Tests/FreeSql.Tests/UnitTest3.cs b/FreeSql.Tests/FreeSql.Tests/UnitTest3.cs
index dcfab4da..93056dd7 100644
--- a/FreeSql.Tests/FreeSql.Tests/UnitTest3.cs
+++ b/FreeSql.Tests/FreeSql.Tests/UnitTest3.cs
@@ -233,6 +233,12 @@ namespace FreeSql.Tests
                     EdiId2 = SqlExt.Max(a.Key).Over().PartitionBy(a.Value.EdiId).OrderByDescending(a.Value.Id).ToValue(),
                 });
 
+            var sqlextIsNull = g.sqlserver.Select<EdiItem>()
+                .ToSql(a => new
+                {
+                    nvl = SqlExt.IsNull(a.EdiId, 0)
+                });
+
             var sqlextGroupConcat = g.mysql.Select<Edi, EdiItem>()
                 .InnerJoin((a, b) => b.Id == a.Id)
                 .ToSql((a, b) => new
diff --git a/FreeSql/Extensions/FreeSqlGlobalExpressionCallExtensions.cs b/FreeSql/Extensions/FreeSqlGlobalExpressionCallExtensions.cs
index a5cecf49..a625db9d 100644
--- a/FreeSql/Extensions/FreeSqlGlobalExpressionCallExtensions.cs
+++ b/FreeSql/Extensions/FreeSqlGlobalExpressionCallExtensions.cs
@@ -104,6 +104,19 @@ namespace FreeSql
         public static ISqlOver<long> RowNumber() => Over<long>("row_number()");
         #endregion
 
+        /// <summary>
+        /// isnull、ifnull、coalesce、nvl
+        /// </summary>
+        /// <typeparam name="TValue"></typeparam>
+        /// <param name="value"></param>
+        /// <param name="defaultValue"></param>
+        /// <returns></returns>
+        public static TValue IsNull<TValue>(TValue value, TValue defaultValue)
+        {
+            expContext.Value.Result = expContext.Value._commonExp._common.IsNull(expContext.Value.ParsedContent["value"], expContext.Value.ParsedContent["defaultValue"]);
+            return default(TValue);
+        }
+
         /// <summary>
         /// case when .. then .. end
         /// </summary>
@@ -311,7 +324,7 @@ namespace FreeSql
         public interface IGroupConcat { }
         #endregion
 
-        #region string.Join 反射处理，此块代卖用于反射，所以别修改定义
+        #region string.Join 反射处理，此块代码用于反射，所以别修改定义
         public static string StringJoinSqliteGroupConcat(object column, object delimiter)
         {
             expContext.Result = $"group_concat({expContext.ParsedContent["column"]},{expContext.ParsedContent["delimiter"]})";
diff --git a/FreeSql/FreeSql.xml b/FreeSql/FreeSql.xml
index 8af604f0..a550efcb 100644
--- a/FreeSql/FreeSql.xml
+++ b/FreeSql/FreeSql.xml
@@ -1103,6 +1103,15 @@
             </summary>
             <returns></returns>
         </member>
+        <member name="M:FreeSql.SqlExt.IsNull``1(``0,``0)">
+            <summary>
+            isnull、ifnull、coalesce、nvl
+            </summary>
+            <typeparam name="TValue"></typeparam>
+            <param name="value"></param>
+            <param name="defaultValue"></param>
+            <returns></returns>
+        </member>
         <member name="M:FreeSql.SqlExt.Case">
             <summary>
             case when .. then .. end