😎调整即时通讯注册

Admin.NET/Admin.NET.Web.Core/Startup.cs

@@ -168,8 +168,11 @@ public class Startup : AppStartup
         services.AddViewEngine();
 
         // 即时通讯
-        services.AddSignalR(SetNewtonsoftJsonSetting);
         //services.AddSingleton<IUserIdProvider, UserIdProvider>();
+        services.AddSignalR(options =>
+        {
+            options.KeepAliveInterval = TimeSpan.FromSeconds(5);
+        }).AddNewtonsoftJsonProtocol(options => SetNewtonsoftJsonSetting(options.PayloadSerializerSettings));
 
         // 系统日志
         services.AddLoggingSetup();