From bc8e0ea8ad37759ea3e3e2ebb60bdef75b49a911 Mon Sep 17 00:00:00 2001
From: maliming <6908465+maliming@users.noreply.github.com>
Date: Tue, 6 Oct 2020 21:33:44 +0800
Subject: [PATCH] Update Application-Services.md

---
 docs/en/Best-Practices/Application-Services.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/en/Best-Practices/Application-Services.md b/docs/en/Best-Practices/Application-Services.md
index 3332ce08ea..b14770d654 100644
--- a/docs/en/Best-Practices/Application-Services.md
+++ b/docs/en/Best-Practices/Application-Services.md
@@ -213,6 +213,12 @@ This method votes a question and returns the current score of the question.
 * **Do** always get all the related entities from repositories to perform the operations on them.
 * **Do** call repository's Update/UpdateAsync method after updating an entity. Because, not all database APIs support change tracking & auto update.
 
+#### Handle files
+
+* **Do not** use any file-related components(like `IFormFile`) or `Stream` in the application service interface. You can use primitive types as file parameters. Such as `byte[]`.
+* **Do** use a controller to handle file upload and call a application service method.
+
+
 #### Using Other Application Services
 
 * **Do not** use other application services of the same module/application. Instead;