From 7594a16e38304739487b053405153379faee6e58 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Thu, 7 Jan 2021 16:23:20 +0800
Subject: 史诗级重构！
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---
 BackEnd/Timeline/Services/BasicTimelineService.cs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'BackEnd/Timeline/Services/BasicTimelineService.cs')

diff --git a/BackEnd/Timeline/Services/BasicTimelineService.cs b/BackEnd/Timeline/Services/BasicTimelineService.cs
index 0d9f64a9..be500135 100644
--- a/BackEnd/Timeline/Services/BasicTimelineService.cs
+++ b/BackEnd/Timeline/Services/BasicTimelineService.cs
@@ -15,6 +15,13 @@ namespace Timeline.Services
     /// </summary>
     public interface IBasicTimelineService
     {
+        /// <summary>
+        /// Check whether a timeline with given id exists without getting full info.
+        /// </summary>
+        /// <param name="id">The timeline id.</param>
+        /// <returns>True if exist. Otherwise false.</returns>
+        Task<bool> CheckExistence(long id);
+
         /// <summary>
         /// Get the timeline id by name.
         /// </summary>
@@ -67,6 +74,11 @@ namespace Timeline.Services
             };
         }
 
+        public async Task<bool> CheckExistence(long id)
+        {
+            return await _database.Timelines.AnyAsync(t => t.Id == id);
+        }
+
         public async Task<long> GetTimelineIdByName(string timelineName)
         {
             if (timelineName == null)
-- 
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