C#列表框通过单击项目填充文本框

我在listbox上遇到了一些问题，我一直在尝试这样做，当我点击一个项目时，它会用该项目的信息填充文本框（下图）。 （不让我贴照片）

这是我的代码（我目前拥有的代码将用我需要的内容填充文本框，但我希望它能够通过单击项目来完成相同的操作）

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提前感谢您的帮助。

请查看ListBox上的事件，它可能会满足您的需要。事实上，docuemntation中的示例代码显示了当在第一个列表框中选择项目时，如何在第二个列表框中选择项目，以便让您了解一些情况。

使用列表框的单击事件；将SelectedItems[0]强制转换为employee并填充文本框。为简单起见，将列表框的多个选择设置为false。例如：

private void listBox1_Clik(object sender, EventArgs e)
{
  Employee employee = listBox1.SelectedItems[0] as Employee;
  if (employee != null)
  {
      // use the employee object to populate the textbox.
  }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
namespace WindowsFormsApplication1
{
    // provides methods to read and write objects to a file
    public interface IStorable
    {
        // writes object's data to a StreamWriter object
        // The StreamReader object to write to
        void WriteData(StreamWriter swo);
        // reads object's data from a StreamReader object
        // The StreamReader object to read from
        void ReadData(StreamReader sro);
    }

    public abstract class Employee : IStorable
    {
        private int empNum;
        private string name;
        private string address;
        private string phoneNum;
        protected const double STATE_TAX = 0.075;
        protected const double FED_TAX = 0.20;
        // set data members to defaults
        public Employee()
        {
            empNum = 0;
            name = "unknown";
            address = "unknown";
            phoneNum = "unknown";
        }
        //  set data members to values passed to method
        //  employee number, name, address, and phone number
        public Employee(int _empNum, string _name, string _address, string _phoneNum)
        {
            empNum = _empNum;
            name = _name;
            address = _address;
            phoneNum = _phoneNum;
        }
        public int EmpNum
        {
            get { return empNum; }
            set { empNum = value; }
        }
        public string Name
        {
            get { return name; }
            set { name = value; }
        }
        public string Address
        {
            get { return address; }
            set { address = value; }
        }
        public string PhoneNum
        {
            get { return phoneNum; }
            set { phoneNum = value; }
        }
        // reads object's data from a StreamReader object
        // The method is virtual so we can use polymorphism
        public virtual void ReadData(StreamReader sro)
        {
            EmpNum = int.Parse(sro.ReadLine());
            Name = sro.ReadLine();
            Address = sro.ReadLine();
            PhoneNum = sro.ReadLine();
        }
        // writes object's data to a StreamReader object
        // The method is virtual so we can use polymorphism
        public virtual void WriteData(StreamWriter sro)
        {
            sro.WriteLine(this.EmpNum);
            sro.WriteLine(this.Name);
            sro.WriteLine(this.Address);
            sro.WriteLine(this.PhoneNum);
        }
        // calculates the employee's net pay
        public abstract double CalcPay();
    } 
    // The Hourly Class - represents an hourly employee
    // Inherits from Employee
    class Hourly : Employee
    {
        private const int WEEK = 40;
        private const double BONUS = 1.5;
        private double hoursWorked;
        private double hourlyWage;
        //set data members to defaults
        public Hourly()
        {
            hoursWorked = 0.0;
            hourlyWage = 0.0;
        }
        // set data members to values passed as arguments
        // employee number, name, address, phone number, hours, and wage
        public Hourly(int _empNum, string _name, string _address, string _phoneNum, double _hours, double _wage)
            : base(_empNum, _name, _address, _phoneNum)
        {
            hoursWorked = _hours;
            hourlyWage = _wage;
        }
        public double HoursWorked
        {
            get { return hoursWorked; }
            set { hoursWorked = value; }
        }
        public double HourlyWage
        {
            get { return hourlyWage; }
            set { hourlyWage = value; }
        }
        //  calculates gross pay
        //  hours * wage + time and 1/2 for overtime
        public override double CalcPay()
        {
            double overTime = 0.0;
            if (hoursWorked > WEEK)
            {
                overTime = hoursWorked - WEEK;
                hoursWorked -= WEEK;
            }
            double grossPay = hoursWorked * hourlyWage + overTime * hourlyWage * BONUS;
            double stateTax = grossPay * STATE_TAX;
            double fedTax = grossPay * FED_TAX;
            return (grossPay - stateTax - fedTax);
        }
        // reads object's data from a StreamReader object
        // Over-rides the ReadData method in Employee
        public override void ReadData(StreamReader sro)
        {       
            HoursWorked = double.Parse(sro.ReadLine());
            HourlyWage = double.Parse(sro.ReadLine());
            base.ReadData(sro);
        }
        // writes object's data to a StreamWriter object
        // Over-rides the WriteData method in Employee
        public override void WriteData(StreamWriter swo)
        {
            swo.WriteLine("hourly");
            swo.WriteLine(this.HoursWorked);
            swo.WriteLine(this.HourlyWage);
            base.WriteData(swo);
        }
    }
    class Salaried : Employee
    {
        private const double BENEFITS = 0.0524;
        private double salary;
        // set data members to defaults
        public Salaried()
        {
            salary = 0.0;
        }
        // set data members to values passed as arguments
        // employee number, name, address, phone number, salary
        public Salaried(int _empNum, string _name, string _address, string _phoneNum, double _salary)
            : base(_empNum, _name, _address, _phoneNum) 
        {
            salary = _salary;
        }
        public double Salary
        {
            get { return salary; }
            set { salary = value; }
        }
        // calculates pay for a salaried employee
        public override double CalcPay()
        {
            double stateTax = salary * STATE_TAX;
            double fedTax = salary * FED_TAX;
            double bennies = salary * BENEFITS;
            return (salary - stateTax - fedTax - bennies);
        }
        //reads object's data from a StreamReader object
        public override void ReadData(StreamReader sro)
        {
            Salary = double.Parse(sro.ReadLine());
            base.ReadData(sro);  // call Employee's ReadData to get name, address, etc
        }
        // writes data to StreamWriter 
        public override void WriteData(StreamWriter swo)
        {
            swo.WriteLine("salaried");
            swo.WriteLine(this.Salary);
            base.WriteData(swo); 
        }
    }
}

private void listBox1_Clik(object sender, EventArgs e)
{
  Employee employee = listBox1.SelectedItems[0] as Employee;
  if (employee != null)
  {
      // use the employee object to populate the textbox.
  }
}