finally

FibonacciWindow.xaml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Documents;
+using System.Windows.Input;
+using System.Windows.Media;
+using System.Windows.Media.Imaging;
+using System.Windows.Shapes;
+
+namespace Lab
+{
+    /// <summary>
+    /// Interaction logic for FibonacciWindow.xaml
+    /// </summary>
+
+    public partial class FibonacciWindow : Window
+    {
+        private void ClickBack(object sender, RoutedEventArgs e) => Close();
+
+        private void ClickCalc(object sender, RoutedEventArgs e)
+        {
+            OutBox.Text = "";
+            InfoText.Text = "";
+
+            if (!Parsers.TryParseInt(NBox.Text, out int n) || n <= 0) {
+                InfoText.Text = "Введите целое N, N > 0.";
+                return;
+            }
+
+            long a = 1;
+            long b = 1;
+            List<long> list = new List<long>();
+            while (a < n) { list.Add(a); long next = a + b; a = b; b = next; }
+
+            OutBox.Text = string.Join(", ", list);
+            InfoText.Text = $"Найдено чисел: {list.Count}.";
+        }
+
+        public FibonacciWindow()
+        {
+            InitializeComponent();
+        }
+    }
+}