- Improvements to system calls

- system calls now async with await
- added start command to example
- added "handled" property to system call event args

TelegramBotBase/Base/FormBase.cs

@@ -44,6 +44,10 @@ namespace TelegramBotBase.Form
             
         }
 
+        /// <summary>
+        /// Gets invoked if gets navigated to this form
+        /// </summary>
+        /// <returns></returns>
         public virtual async Task Opened()
         {
 
@@ -62,17 +66,31 @@ namespace TelegramBotBase.Form
 
         }
 
+        /// <summary>
+        /// Gets invoked if the form gets loaded and on every message belongs to this context
+        /// </summary>
+        /// <param name="message"></param>
+        /// <returns></returns>
         public virtual async Task Load(MessageResult message)
         {
 
         }
 
+        /// <summary>
+        /// Gets invoked if the user has clicked a button.
+        /// </summary>
+        /// <param name="message"></param>
+        /// <returns></returns>
         public virtual async Task Action(MessageResult message)
         {
 
         }
 
-
+        /// <summary>
+        /// Gets invoked at the end of the cycle to "Render" text, images, buttons, etc...
+        /// </summary>
+        /// <param name="message"></param>
+        /// <returns></returns>
         public virtual async Task Render(MessageResult message)
         {
 

TelegramBotBase/BotBase.cs

@@ -42,6 +42,8 @@ namespace TelegramBotBase
 
         private static object __evSystemCall = new object();
 
+        public delegate Task SystemCallEventHandler(object sender, SystemCallEventArgs e);
+
         private static object __evException = new object();
 
         private static object __evUnhandledCall = new object();
@@ -220,7 +222,10 @@ namespace TelegramBotBase
             if (e.IsSystemCall && this.SystemCalls.Contains(e.SystemCommand))
             {
                 var sce = new SystemCallEventArgs(e.SystemCommand, e.SystemCallParameters, e.Message, ds.DeviceId, ds);
-                OnSystemCall(sce);
+                await OnSystemCall(sce);
+
+                if (sce.Handled)
+                    return;
             }
 
             FormBase activeForm = null;
@@ -377,21 +382,13 @@ namespace TelegramBotBase
         /// <summary>
         /// Will be called if a system call gets raised
         /// </summary>
-        public event EventHandler<SystemCallEventArgs> SystemCall
-        {
-            add
-            {
-                this.__Events.AddHandler(__evSystemCall, value);
-            }
-            remove
-            {
-                this.__Events.RemoveHandler(__evSystemCall, value);
-            }
-        }
+        public event SystemCallEventHandler SystemCall;
 
-        public void OnSystemCall(SystemCallEventArgs e)
+
+        public async Task OnSystemCall(SystemCallEventArgs e)
         {
-            (this.__Events[__evSystemCall] as EventHandler<SystemCallEventArgs>)?.Invoke(this, e);
+            if (this.SystemCall != null)
+                await SystemCall(this, e);
         }
 
         /// <summary>

TelegramBotBase/Properties/AssemblyInfo.cs

@@ -32,5 +32,5 @@ using System.Runtime.InteropServices;
 // Sie können alle Werte angeben oder die standardmäßigen Build- und Revisionsnummern 
 // übernehmen, indem Sie "*" eingeben:
 // [assembly: AssemblyVersion("1.0.*")]
-[assembly: AssemblyVersion("1.3.1.0")]
-[assembly: AssemblyFileVersion("1.3.1.0")]
+[assembly: AssemblyVersion("1.3.1.2")]
+[assembly: AssemblyFileVersion("1.3.1.2")]