不断收到此错误:事件“System.Windows.Controls.Primitives.ToggleButton.Checked"只能出现在 += 或 -= 的左侧 [英] Keep getting this error: The event 'System.Windows.Controls.Primitives.ToggleButton.Checked' can only appear on the left hand side of += or -=

问题描述

在制作如下程序时，我不断收到此错误:

I keep getting this error when making the program as given below:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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 simplecalc
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            int a, b, c;
            a = int.Parse(textBox1.Text);
            b = int.Parse(textBox2.Text);
            if (rbadd.Checked == true)
                c = a + b;
            else if (rbsubtract.Checked == true)
                c = a - b;
            else if (rbdivide.Checked == true)
                c = a / b;
            else
                c = a * b;
            textBox3.Text = c.ToString();
        }
    }
}

我正在用 WPF 用 C# 制作一个基本的计算器.我对 C# 很陌生.

I am in the process of making a basic calculator in C# in WPF. I am very new to C#.

推荐答案

Checked 这里是一个事件，而不是一个bool，发生了何时被检查.您需要一个不同的属性 - 大概是 IsChecked.

Checked here is an event, not a bool, that happens when it is checked. You need a different property - presumably IsChecked.

小注，但在风格上，通常最好不要将布尔值与 true/false 进行比较，而是:

Minor note, but stylistically, it is usually preferable not to compare booleans to true/false, but rather:

        if (rbadd.IsChecked)
            c = a + b;
        else if (rbsubtract.IsChecked)
            c = a - b;
        else if (rbdivide.IsChecked)
            c = a / b;

等；或者如果您想测试 false:if(!rbadd.IsChecked).

etc; or if you wanted to test for false: if(!rbadd.IsChecked).

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