Updated Repository Layer (markdown)

Repository-Layer.md

@@ -119,6 +119,51 @@ repo.CompareState(item) can obtain the status change information
 Dictionary<string, object[]> CompareState(TEntity newdata);
 ```
 
+## Ioc + Login
+
+`repo.DbContextOptions.AuditValue` is suitable for combining with Ioc AddScoped information.
+
+Example: Automatically use login information when using warehouse insert/update
+
+```csharp
+services.AddSingleton(fsql);
+services.AddScoped(r => new MyRepositoryOptions
+{
+    AuditValue = e => {
+        var user = r.GetService<User>();
+        if (user == null) return;
+        if (e.AuditValueType == AuditValueType.Insert &&
+            e.Object is IEntityCreated obj1 && obj1 != null) {
+            obj1.CreatedUserId = user.Id;
+            obj1.CreatedUserName = user.Username;
+        }
+        if (e.AuditValueType == AuditValueType.Update &&
+            e.Object is IEntityModified obj2 && obj2 != null) {
+            obj2.ModifiedUserId = user.Id;
+            obj2.ModifiedUserName = user.Username;
+        }
+    }
+});
+services.AddScoped(typeof(IBaseRepository<>), typeof(MyRepository<>));
+services.AddScoped(typeof(IBaseRepository<,>), typeof(MyRepository<,>));
+
+class MyRepository<TEntity, TKey> : BaseRepository<TEntity, TKey> where TEntity : class
+{
+    public MyRepository(IFreeSql fsql, MyRepositoryOptions options) : base(fsql, null, null)
+    {
+        if (options?.AuditValue != null) DbContextOptions.AuditValue += (_, e) => options.AuditValue(e);
+    }
+}
+class MyRepository<TEntity> : MyRepository<TEntity, long> where TEntity : class
+{
+    public MyRepository(IFreeSql fsql, MyRepositoryOptions options) : base(fsql, options) { }
+}
+class MyRepositoryOptions
+{
+    public Action<DbContextAuditValueEventArgs> AuditValue { get; set; }
+}
+```
+
 ## Filtering and Verification
 
 Suppose we have two entities: `User` and `Topic`, and two repositories are defined in the domain class: