C#：如何在组合框中显示来自自定义 class 对象的列表

Question

这是我的 class:

namespace LAN_index_program
{
public class LAN_object
{
    public string Name { get; set; }
    public LAN_object(
        DEVICETYPE a_type,
        string a_deviceName,
        string a_deviceManufacure,
        string a_deviceOwner,
        string a_deviceIp,
        string a_deviceMac,
        DateTime a_deviceInstalationDate
        )
    {
        m_deviceType = a_type;
        m_deviceName            = a_deviceName;
        m_deviceManufacure      = a_deviceManufacure;
        m_deviceOwner           = a_deviceOwner;
        m_deviceIp              = a_deviceIp;
        m_deviceMac             = a_deviceMac;
        m_deviceInstalationDate = a_deviceInstalationDate;
        Name = a_deviceName;
    }

//        public string a_deviceName
//        {
//            get
//            {
//                return m_deviceName;
//            }
//        }

    public enum DEVICETYPE
    {
        Router,
        Switch,
        Access_point,
        Laptop,
        Phone,
        Computer
    };

    public string toString()
    {
        string lan_onbjectstring = "";

        lan_onbjectstring = m_deviceType.ToString() + "\r\n";
        lan_onbjectstring +=  m_deviceName + "\r\n";
        lan_onbjectstring += m_deviceManufacure + "\r\n";
        lan_onbjectstring += m_deviceOwner + "\r\n";
        lan_onbjectstring += m_deviceIp + "\r\n";
        lan_onbjectstring += m_deviceMac + "\r\n";
        lan_onbjectstring += m_deviceInstalationDate.ToShortDateString() + "\r\n";

        return lan_onbjectstring;
    }

    public override string ToString()
    {
        return m_deviceName;
    }

    DEVICETYPE m_deviceType;
    string m_deviceName;
    string m_deviceManufacure;
    string m_deviceOwner;
    string m_deviceIp;
    string m_deviceMac;
    DateTime m_deviceInstalationDate;
}
}

这是我认为可以做到的代码：

m_listLanObjects = new List<LAN_object>();

        comboBox1.DataSource = m_listLanObjects;
        comboBox1.DisplayMember = "Name";
        comboBox1.ValueMember = null;

每次我向列表添加新的 LAN_object 时，我都会将数据源重置为 m_listlanobjects。但是组合框没有填满。

namespace LAN_index_program
{
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        m_listLanObjects = new List<LAN_object>();

        comboBox1.DataSource = m_listLanObjects;
        comboBox1.DisplayMember = "Name";
        comboBox1.ValueMember = null;

    }


    public void AddLanObject(LAN_object a_newLanObject, LAN_object a_oldlanobject, bool New = true)
    {
        if (New)
        {
            m_listLanObjects.Add(a_newLanObject);
        }
        else
        {
            int index = m_listLanObjects.IndexOf(a_oldlanobject);
            m_listLanObjects.RemoveAt(index);
            m_listLanObjects.Insert(index, a_newLanObject);
        }
        richTextBox1.Text = "";
        richTextBox1.Text = listToString();
        comboBox1.DataSource = m_listLanObjects;
    }
}
}

我想从它的名字中选择一个 lan_object (m_deviceName)。并在按下按钮时想要在进一步的功能中使用该特定 Lan_object。

希望有人能帮忙，google一次没帮上忙。

Answer 1

为了尽可能多地保持当前代码相同，您必须先将 DataSource 设置为 null，然后再次设置 DisplayMember（因为它被删除），然后再次设置你的DataSource。

comboBox1.DataSource = null;
comboBox1.DisplayMember = "Name";
comboBox1.DataSource = m_listLanObjects;

一种更简单的方法是使用 BindingList<T> 而不是 List<T>，因为这将自动更新您的 DataSource，而无需重置 DataSource.

您将 BindingList 声明如下：

private BindingList<LAN_object> m_listLanObjects = new BindingList<LAN_object>();

public Form1()
{
    InitializeComponent();

    comboBox1.DataSource = new BindingSource {DataSource = m_listLanObjects};
    comboBox1.DisplayMember = "Name";
}

然后只需将项目添加到集合中，它们就会显示在 ComboBox。

C#：如何在组合框中显示来自自定义 class 对象的列表

C#: how to show list from custom class objects in a combobox

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