From e9504f3b36137dbea39ff9cf062dbcc265080532 Mon Sep 17 00:00:00 2001
From: FlorianDahn <ich@florian-dahn.de>
Date: Tue, 15 Sep 2020 16:36:54 +0200
Subject: [PATCH] Update ButtonForm.cs

- adding method for adding one single button row
- fix for ToList method if no buttons are available
---
 TelegramBotBase/Form/ButtonForm.cs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/TelegramBotBase/Form/ButtonForm.cs b/TelegramBotBase/Form/ButtonForm.cs
index 048c83e..47d023b 100644
--- a/TelegramBotBase/Form/ButtonForm.cs
+++ b/TelegramBotBase/Form/ButtonForm.cs
@@ -61,6 +61,11 @@ namespace TelegramBotBase.Form
             this.DependencyControl = control;
         }
 
+        public void AddButtonRow(String Text, String Value, String Url = null)
+        {
+            Buttons.Add(new List<ButtonBase>() { new ButtonBase(Text, Value, Url) });
+        }
+
         public void AddButtonRow(IEnumerable<ButtonBase> row)
         {
             Buttons.Add(row.ToList());
@@ -129,7 +134,7 @@ namespace TelegramBotBase.Form
 
         public List<ButtonBase> ToList()
         {
-            return this.Buttons.Aggregate((a, b) => a.Union(b).ToList());
+            return this.Buttons.DefaultIfEmpty(new List<ButtonBase>()).Aggregate((a, b) => a.Union(b).ToList());
         }
 
         public InlineKeyboardButton[][] ToInlineButtonArray()