單擊按鈕時增加文本框值 WPF C#

Question

我想要做的是我有一個文本框，一個“-”和一個“+”按鈕，在按鈕單擊時我需要減少/增加它的值。 我對 WPF 的經驗接近 0，我們只在學校學習過控制台應用程序，現在我們得到了這個任務，我不知道為什么這個代碼示例不起作用：

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.Navigation;
using System.Windows.Shapes;

namespace sudokuGUI
{
   /// <summary>
   /// Interaction logic for MainWindow.xaml
   /// </summary>
   public partial class MainWindow : Window
   {
       public MainWindow()
       {
           InitializeComponent();
       }

       private void Button_Click(object sender, RoutedEventArgs e)
       {
           int ertek = Convert.ToInt32(textBox1.Text);
           if (ertek > 4)
           {
               textBox1.Text = $"{ertek--}";
           }
       }

       private void Button_Click_1(object sender, RoutedEventArgs e)
       {
           int ertek = Convert.ToInt32(textBox1.Text);
           if (ertek < 9)
           {
               textBox1.Text = $"{ertek++}";
           }
       }
   }
}

<Window x:Class="sudokuGUI.MainWindow"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
       xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
       xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
       xmlns:local="clr-namespace:sudokuGUI"
       mc:Ignorable="d"
       Title="Sudoku-ellenőrző" Height="210" Width="540">
   <Grid>
       <TextBox x:Name="textBox2" HorizontalAlignment="Left" Height="23" TextWrapping="Wrap" VerticalAlignment="Top" Width="512" Margin="10,90,0,0"/>
       <Label Content="Új feladvány mérete:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,10,0,0"/>
       <Button Content="-" HorizontalAlignment="Left" VerticalAlignment="Top" Width="20" Margin="144,13,0,0" Click="Button_Click"/>
       <Button Content="+" HorizontalAlignment="Left" VerticalAlignment="Top" Width="20" Margin="194,13,0,0" Click="Button_Click_1"/>
       <Label Content="Kezdőállapot:" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,59,0,0"/>
       <Label x:Name="label1" Content="Hossz: 0" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,118,0,0"/>
       <Button Content="Ellenőrzés" HorizontalAlignment="Left" VerticalAlignment="Top" Width="75" Margin="447,118,0,0"/>
       <TextBox x:Name="textBox1" HorizontalAlignment="Left" Height="20" TextWrapping="Wrap" Text="4" VerticalAlignment="Top" Width="20" Margin="169,13,0,0" TextAlignment="Center" IsEnabled="False"/>

   </Grid>
</Window>

任何幫助表示贊賞！

Answer 1

ertek++是一個后綴自增運算符。 ertek++的結果就是運行前ertek的值。

使用簡單的+運算符：

private void Button_Click_1(object sender, RoutedEventArgs e)
{
   int ertek = Convert.ToInt32(textBox1.Text);
   if (ertek < 9)
   {
       textBox1.Text = $"{ertek+1}";
   }
}