Question

我对编程很陌生。我目前正在尝试创建将计算number1的平方根等的WPF应用程序。我在使用计算平方根（而不仅仅是）的方法时遇到问题。我收到一个错误说：

没有任何论据符合所需的形式参数＆＃39; sender＆＃39; ＆＃39; MainWindow.RadioBT_Root2_Checked（object，RoutedEventArgs）＆＃39;

RadioBT_Root3_Checked和RadioBT_Root4_Checked发生此错误，因为我有3种方法。

其代码为CS7036。我做得不好？我搜索的很多，但我无法找到它（或者我无法搜索）。

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.Navigation;
using System.Windows.Shapes;

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

    double number1;
    double number2;
    double result;

    private void TXB_1_TextChanged(object sender, TextChangedEventArgs e) {

    }

    private void TXB_2_TextChanged(object sender, TextChangedEventArgs e) {

    }

    private void BT_Potegowanie_Click(object sender, RoutedEventArgs e) {
      try {
        number1 = double.Parse(TXB_1.Text);
        number2 = double.Parse(TXB_2.Text);
        result = Math.Pow(number1, number2);

        MessageBox.Show("WYNIK: " + result.ToString());

      } catch (Exception) {
        MessageBox.Show("Wystąpił błąd.", "Błąd", MessageBoxButton.OK, MessageBoxImage.Error);
      }
    }

    public void BT_Root_Click(object sender, RoutedEventArgs e) {
      if (RadioBT_Root2_Checked()) ///CS7036
        MessageBox.Show("RESULT: " + result.ToString());

      if (RadioBT_Root3_Checked()) ///CS7036
        MessageBox.Show("RESULT: " + result.ToString());

      if (RadioBT_Root4_Checked()) ///CS7036
        MessageBox.Show("RESULT: " + result.ToString());
    }

    public void RadioBT_Root2_Checked(object sender, RoutedEventArgs e) {
      number1 = double.Parse(TXB_1.Text);
      result = Math.Sqrt(number1);
    }

    public void RadioBT_Root3_Checked(object sender, RoutedEventArgs e) {
      number1 = double.Parse(TXB_1.Text);
      number2 = (1 / 3.0);
      result = Math.Pow(number1, number2);
    }

    public void RadioBT_Root4_Checked(object sender, RoutedEventArgs e) {
      number1 = double.Parse(TXB_1.Text);
      number2 = (1 / 4.0);
      result = Math.Pow(number1, number2);
    }
  }
}

编辑：我已经完成了Ed Plunkett所吮吸的事情，而我现在又遇到了另一个问题。它与XAML有关（我认为）。我还发现我可能需要放置＆＃39; ??假＆＃39;在某些地方。错误列表显示：＆＃39; MainWindow＆＃39;不包含＆＃39; RadioBT_Root4_Checked＆＃39;的定义没有扩展方法＆＃39; RadioBT_Root4_Checked＆＃39;接受类型＆＃39; MainWindow＆＃39;的第一个参数。可以找到（你错过了使用指令或程序集引用吗？）

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.Navigation;
using System.Windows.Shapes;

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

        private void TXB_1_TextChanged(object sender, TextChan`enter code here`gedEventArgs e)
        {

        }

        private void TXB_2_TextChanged(object sender, TextChangedEventArgs e)
        {

        }

        public void BT_Root_Click(object sender, RoutedEventArgs e)
        {
            double number1 = 0;
            double number2 = 0;
            double result = 0;

            if (RadioBT_Root2.IsChecked ?? false)    ///CS0266
            {
                number1 = double.Parse(TXB_1.Text);
                result = Math.Sqrt(number1);
            }
            else if (RadioBT_Root3.IsChecked ?? false)   ///CS0266
            {
                number1 = double.Parse(TXB_1.Text);
                number2 = (1 / 3.0);
                result = Math.Pow(number1, number2);
            }
            else if (RadioBT_Root4.IsChecked ?? false)   ///CS0266
            {
                number1 = double.Parse(TXB_1.Text);
                number2 = (1 / 4.0);
                result = Math.Pow(number1, number2);
            }

            MessageBox.Show("RESULT: " + result.ToString());
        }       
    }

我的XAML代码：

＆＃13;

<Window x:Class="Examples.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:Examples"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Label x:Name="label" Content="First number&#xD;&#xA;&#xA;First number" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="10,10,0,0" Width="117" Height="31" FontSize="15"/>
        <TextBox x:Name="TXB_1" HorizontalAlignment="Left" Height="28" Margin="132,10,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120" FontSize="15" TextChanged="TXB_1_TextChanged"/>
        <Label x:Name="label1" Content="Second number&#xD;&#xA;&#xA;Second number&#xD;&#xA;" HorizontalAlignment="Left" Margin="10,46,0,0" VerticalAlignment="Top" Width="117" Height="30" FontSize="15"/>
        <TextBox x:Name="TXB_2" HorizontalAlignment="Left" Height="28" Margin="132,48,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="120" TextChanged="TXB_2_TextChanged" FontSize="15"/>
        <Separator HorizontalAlignment="Left" Height="19" Margin="0,69,0,0" VerticalAlignment="Top" Width="517"/>
        <Button x:Name="BT_Root" Content="ROOT" HorizontalAlignment="Left" Margin="10,81,0,0" VerticalAlignment="Top" Width="128" Height="48" FontSize="16" Click="BT_Root_Click"/>
        <RadioButton x:Name="RadioBT_Root2" Content="Root2" HorizontalAlignment="Left" Margin="143,81,0,0" VerticalAlignment="Top" Checked="RadioBT_Root2_Checked"/>
        <RadioButton x:Name="RadioBT_Root3" Content="Root3" HorizontalAlignment="Left" Margin="143,96,0,0" VerticalAlignment="Top" Checked="RadioBT_Root3_Checked"/>
        <RadioButton x:Name="RadioBT_Root4" Content="Root4" HorizontalAlignment="Left" Margin="143,111,0,0" VerticalAlignment="Top" Checked="RadioBT_Root4_Checked"/>
    </Grid>
</Window>

＆＃13;

我也试过更改＆＃39; Checked =＆＃34; RadioBT_Root4_Checked＆＃34; /＆gt;＆＃39; to＆＃39; Checked =＆＃34; RadioBT_Root4.IsChecked＆＃34; /＆gt;＆＃39;。它说＆＃39;错误检查=＆＃34; RadioBT_Root2.IsChecked＆＃34;无效。＆＃39; RadioBT_Root2.IsChecked＆＃39;不是有效的事件处理程序方法名称。只有生成的或代码隐藏类的实例方法才有效。＆＃39;

Answer 1

您正在调用事件处理程序 - 例如RadioBT_Root2_Checked - 没有参数，即使它们需要两个参数。你也表现得像他们“回归”bool，即使他们“没有”回归。

“回归”是什么意思？ 1 + 3返回4：

int x = 1 + 3;

现在x等于4.

函数可以返回值：

public bool GreaterThan(int x, int y) { return x > y; }

像这样使用：

if (GreaterThan(10, 9))
{
    MessageBox.Show("10 is greater than 9");
}

但我认为你真的不想打电话给那些方法。我想这就是你想要的：

单击Root时，我认为您想要找出用户单击的复选框，然后显示该结果。选中复选框后，计算结果;这些函数是事件处理程序。要找出每个复选框的IF，请查看复选框对象 - 使用您给出的名称 - 并查看其IsChecked属性。

像这样：

public void BT_Root_Click(object sender, RoutedEventArgs e) { if (RadioBT_Root2.IsChecked) MessageBox.Show("RESULT: " + result.ToString()); else if (RadioBT_Root3.IsChecked) MessageBox.Show("RESULT: " + result.ToString()); else if (RadioBT_Root4.IsChecked) MessageBox.Show("RESULT: " + result.ToString()); }

除了，看看那些if语句：这三个人都在做同样的事情。您可以进一步简化：

public void BT_Root_Click(object sender, RoutedEventArgs e) { MessageBox.Show("RESULT: " + result.ToString()); }

但这是一个更好的方法：

public void BT_Root_Click(object sender, RoutedEventArgs e) { double number1 = 0; double number2 = 0; double result = 0; if (RadioBT_Root2.IsChecked) { number1 = double.Parse(TXB_1.Text); result = Math.Sqrt(number1); } else if (RadioBT_Root3.IsChecked) { number1 = double.Parse(TXB_1.Text); number2 = (1 / 3.0); result = Math.Pow(number1, number2); } else if (RadioBT_Root4.IsChecked) { number1 = double.Parse(TXB_1.Text); number2 = (1 / 4.0); result = Math.Pow(number1, number2); } MessageBox.Show("RESULT: " + result.ToString()); }

您不需要result，number和number2成为类成员，并且您根本不需要这些*_Checked事件处理程序。

没有任何论据符合所要求的形式参数＆＃39; sender＆＃39; of MainWindow

1 个答案: