c# - 如何从复选框/Windows 窗体/C# 显示随机名称

Question

首先我会说我是编程初学者，但我想制作一个工作程序来随机化员工的姓名。仅在复选框中选中的名称。目前，它会从所有名称或最近选择的名称中随机分配我。目前名称标记为:N1、N2、N3、N4、N5: 我的代码如下:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace MNW_v._1
{
    public partial class Form1 : Form
    {
      
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           
        }

        private void groupBox1_Enter(object sender, EventArgs e)
        {

        }

        private void N1_CheckedChanged(object sender, EventArgs e)
        {
            
        }

        private void N2_CheckedChanged(object sender, EventArgs e)
        {
            
        }

        private void N3_CheckedChanged(object sender, EventArgs e)
        {
            
        }

        private void N4_CheckedChanged(object sender, EventArgs e)
        {
            
        }

        private void N5_CheckedChanged(object sender, EventArgs e)
        {
            
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string[] tablica = new string[] { N1.Text, N2.Text, N3.Text, N4.Text, N5.Text };
            
            Random rn = new Random();
            int obj = rn.Next(0, tablica.Length);
            Console.Write(obj);
            if (N1.Checked)
            {
                MessageBox.Show(N1.Text);
            }
            else if (N2.Checked)
            {
                MessageBox.Show(N2.Text);
            }
            else if (N3.Checked)
            {
                MessageBox.Show(N3.Text);
            }
            else if (N4.Checked)
            {
                MessageBox.Show(N4.Text);
            }
            else if (N5.Checked)
            {
                MessageBox.Show(N5.Text);
            }
            
        }
    }
}

我已经尝试过创建一个附加类，但似乎选中这些框不会影响程序的运行。

Answer 1

我宁愿有一个 CheckBox 数组，而不是它们的 Text 数组:

using System.Linq;

...

private void button1_Click(object sender, EventArgs e) {
  // So we have all CheckBoxes of interest in the collection (array)
  // we can query
  var boxes = new CheckBox[] {
    N1, N2, N3, N4, N5
  };

  // How many checked CheckBoxes do we have
  int count = boxes.Count(box => box.Checked);

  // If we have at least one checked CheckBox, we can get random one
  string randomName = count > 0
    ? boxes.Where(box => box.Checked).ElementAt(Random.Shared.Next(count)).Text
    : ""; // If none of boxes has been checked 

  MessageBox.Show(randomName);      
}

如果您的 .Net 版本不支持Random.Shared，您可以使用字段:

using System.Linq;

...

private static readonly Random random = new Random();

private void button1_Click(object sender, EventArgs e) {
  var boxes = new CheckBox[] {
    N1, N2, N3, N4, N5
  };

  int count = boxes.Count(box => box.Checked);

  string randomName = count > 0
    ? boxes.Where(box => box.Checked).ElementAt(random.Next(count)).Text
    : ""; 

  MessageBox.Show(randomName);      
}