在组合框中正确显示列表项并对项目选择做出反应

Question

我创建了一个我的自定义类对象的列表“employeeList”。 该类称为“Employee”：

public class Employee
{
    public string firstName;
    public string lastName;
    public string region;
    public Position position;
    public List<double> goals;
    public List<double> tests;
    public double correlation;
    public Employee supervisor;
    ....
}

这里我将列表传递给 Form.cs 并将我的列表绑定到组合框

var employeeList = correlation.ComputeCorrelation();
var bSource = new BindingSource();
bSource.DataSource = employeeList;
comboBox1.DataSource = bSource.DataSource;
Employee f = (Employee)comboBox1.SelectedItem;

老实说，我还没有完全弄清楚整个绑定是如何工作的，但这不是问题。问题是，一旦绑定完成，所有项目都会以它们的默认名称出现在组合框中，例如 Correlation_new.Employee。我想要做的是通过 Employee 类中的字段“名称”显示项目。我怎么做？

另外，我只是不知道如何处理在组合框中选择项目的事件。我需要获取该项目的内容。

Answer 1

你的 Employee.cs 类应该写成如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace YourProjectName
{
public class Employee
{
    public string firstName;
    public string lastName;
    public string region;
    public Position position;
    public List<double> goals;
    public List<double> tests;
    public double correlation;
    public Employee supervisor;
    public String GetFirstName() { return firstName; }
    public String GetLastName() { return lastName; }
    public String GetRegion() { return region; }
    /*You can increase get method to connect your variables.*/
}

 */*Above class like .net mvc model classes.*/*

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Linq;
    using System.Text;

    namespace YourProjectName
    {
    public partial class Form 
    {
        private List<Employee> employees{ get; set; }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            txtTitleBox.Text = comboBox1.SelectedItem.ToString();
        }

        public List<Employee> LoadCombobox()
        {
                List<Employee> employees= new List<Employee>(); 
                var employeeList = correlation.ComputeCorrelation();
                var bSource = new BindingSource();
                bSource.DataSource = employeeList;
                employees.Add(bSource.DataSource);
                return employees;
        }

        private void LoadYourCombobox_1(object sender, EventArgs e)
        {
          employees= LoadCombobox();
          foreach (Employee employee in employees)
            {
                comboBox1.Items.Add(employees.GetFirstName());
            }
        }
    }
    }

当用户选择项目时，您可以使用以下代码块：

Employees employee = employees.Where(f => f.GetFirstName().Equals(comboBox1.SelectedValue)).FistOrDefault();

if (employee!= null)
{
    //do work
}

或者你可以使用下面的代码块：

if you want the firstName: comboBox1.SelectedValue

if you want the index: comboBox1.SelectedIndex

希望代码对你有所帮助。