Improvements and Adjustments

await Task.CompletedTask;
return await Task.FromResult(0);

v2rayN/ServiceLib/Handler/AppHandler.cs

@@ -135,7 +135,7 @@
             return await SQLiteHelper.Instance.TableAsync<SubItem>().OrderBy(t => t.Sort).ToListAsync();
         }
 
-        public async Task<SubItem?> GetSubItem(string subid)
+        public async Task<SubItem?> GetSubItem(string? subid)
         {
             return await SQLiteHelper.Instance.TableAsync<SubItem>().FirstOrDefaultAsync(t => t.Id == subid);
         }

v2rayN/ServiceLib/Handler/AutoStartupHandler.cs

@@ -45,6 +45,8 @@ namespace ServiceLib.Handler
             {
                 AutoStartTaskService(autoRunName, "", "");
             }
+
+            await Task.CompletedTask;
         }
 
         private static async Task SetTaskWindows()
@@ -66,6 +68,7 @@ namespace ServiceLib.Handler
             {
                 Logging.SaveLog(_tag, ex);
             }
+            await Task.CompletedTask;
         }
 
         /// <summary>
@@ -127,6 +130,7 @@ namespace ServiceLib.Handler
             {
                 Logging.SaveLog(_tag, ex);
             }
+            await Task.CompletedTask;
         }
 
         private static async Task SetTaskLinux()

v2rayN/ServiceLib/Handler/ConfigHandler.cs

@@ -162,7 +162,7 @@ namespace ServiceLib.Handler
                 Length = "100-200",
                 Interval = "10-20"
             };
-             
+
             if (config.SystemProxyItem.SystemProxyExceptions.IsNullOrEmpty())
             {
                 config.SystemProxyItem.SystemProxyExceptions = Utils.IsWindows() ? Global.SystemProxyExceptionsWindows : Global.SystemProxyExceptionsLinux;
@@ -472,7 +472,7 @@ namespace ServiceLib.Handler
             }
 
             ProfileExHandler.Instance.SetSort(lstProfile[index].IndexId, sort);
-            return 0;
+            return await Task.FromResult(0);
         }
 
         /// <summary>
@@ -1050,7 +1050,7 @@ namespace ServiceLib.Handler
                     Port = node.PreSocksPort.Value,
                 };
             }
-
+            await Task.CompletedTask;
             return itemSocks;
         }
 
@@ -1620,7 +1620,7 @@ namespace ServiceLib.Handler
                         break;
                     }
             }
-            return 0;
+            return await Task.FromResult(0);
         }
 
         public static async Task<int> SetDefaultRouting(Config config, RoutingItem routingItem)

v2rayN/ServiceLib/Handler/CoreConfigHandler.cs

@@ -80,7 +80,7 @@
 
                 ret.Msg = string.Format(ResUI.SuccessfulConfiguration, "");
                 ret.Success = true;
-                return ret;
+                return await Task.FromResult(ret);
             }
             catch (Exception ex)
             {

v2rayN/ServiceLib/Handler/ProfileExHandler.cs

@@ -20,7 +20,7 @@ namespace ServiceLib.Handler
         public async Task Init()
         {
             await InitData();
-            Task.Run(async () =>
+            _ = Task.Run(async () =>
             {
                 while (true)
                 {
@@ -32,7 +32,7 @@ namespace ServiceLib.Handler
 
         public async Task<ConcurrentBag<ProfileExItem>> GetProfileExs()
         {
-            return _lstProfileEx;
+            return await Task.FromResult(_lstProfileEx);
         }
 
         private async Task InitData()

v2rayN/ServiceLib/Handler/StatisticsHandler.cs

@@ -72,7 +72,7 @@
                 return;
             }
 
-            if(indexId == toIndexId)
+            if (indexId == toIndexId)
             {
                 return;
             }
@@ -101,7 +101,7 @@
 
         private void UpdateServerStatHandler(ServerSpeedItem server)
         {
-            UpdateServerStat(server);
+            _ = UpdateServerStat(server);
         }
 
         private async Task UpdateServerStat(ServerSpeedItem server)