将对象绑定到ListBox [英] Bind object to ListBox

问题描述

我正在做Windows窗体应用程序，我有以下课程:

I am doing a Windows Form Application and I have the following classes:

Person.cs

class Person
{
    public string name{ get; set; }

    public Person(string name)
    {
        this.name = name;
    }
}

Repository.cs

class Repository
{

    private static instance;

    private Repository()
    {
        persons= new List<Person>();
    }

    public static Instance
    {
        get
        {
             if (instance == null)
             {
                 instance = new Repository();
             }
             return instance;
        }
    }

    private List<Person> videos;

    public List<Person> getVideos()
    {
        return videos;
    }
}

我想将Form中的ListBox绑定到存储库中的人员列表.

I want to bind a ListBox in my Form to the list of persons in my repository.

我该怎么做?我正在尝试使用设计器执行此操作，我的ListBox中有字段DataSource，是否将其与我的Person或Repository类绑定? cass的字段必须是公共的?绑定后，我添加到存储库中的所有数据都会自动出现在我的ListBox?

How can I do that? I am trying to do that using the designer, I have the field DataSource in my ListBox, do I bind it with my Person or Repository class? The fields of the cass must be public? After the binding any data I add to my repository will automatically appear in my ListBox?

推荐答案

以下是将List<T>绑定到ListBox的绝对最小示例:

Here is an absolutely minimal example of databinding a List<T> to a ListBox:

class Person
{
    public string Name{ get; set; }               // the property we need for binding
    public Person(string name) { Name = name; }   // a constructor for convenience
    public override string ToString() {  return Name; }  // necessary to show in ListBox
}

class Repository
{
    public List<Person> persons { get; set; }
    public Repository()  { persons = new List<Person>(); }
}

private void button1_Click(object sender, EventArgs e)
{
    Repository rep = new Repository();           // set up the repository
    rep.persons.Add(new Person("Tom Jones"));    // add a value
    listBox1.DataSource = rep.persons;           // bind to a List<T>
}

注意:由于多种原因，DataSource的每次更改，显示屏都不会不更新，其中最显着的原因是性能.我们可以通过以下最小方式控制刷新:

Note: The display will not update on each change to the DataSource for several reasons, most notably for performance. We can control the refresh, in a minimal way like this:

private void button2_Click(object sender, EventArgs e)
{
    rep.persons.Add(new Person("Tom Riddle"));
    listBox1.DataSource = null;  
    listBox1.DataSource = rep.persons;  
}

使用BindingSource稍微扩展示例，我们可以调用ResetBindings来更新如下所示的项目:

Expanding the example a little, using a BindingSource we can, among other things, call ResetBindings to update the items shown like this:

private void button1_Click(object sender, EventArgs e)
{
    rep.persons.Add(new Person("Tom Jones"));
    rep.persons.Add(new Person("Tom Hanks"));
    BindingSource bs = new BindingSource(rep, "persons");
    listBox1.DataSource = bs;
}

private void button2_Click(object sender, EventArgs e)
{
    rep.persons.Add(new Person("Tom Riddle"));
    BindingSource bs = (BindingSource)listBox1.DataSource;
    bs.ResetBindings(false);
}

这篇关于将对象绑定到ListBox的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！