How to Bind a Custom Class List to a ComboBox in C#?

Use binding list to operate ComboBox

This article describes how to bind a list of custom class objects to the ComboBox control. Here is the solution:

First, modify the Country class and add a constructor to initialize the Name and Cities properties:

<code class="language-csharp">public class Country
{
    public string Name { get; set; }
    public IList<City> Cities { get; set; }

    public Country(string name)
    {
        Name = name;
        Cities = new List<City>();
    }
}</code>

Create Country list of objects:

<code class="language-csharp">List<Country> countries = new List<Country>
{
    new Country("英国"),
    new Country("澳大利亚"),
    new Country("法国")
};</code>

Initialize BindingSource and set it DataSource to a list of countries:

<code class="language-csharp">var bindingSource1 = new BindingSource();
bindingSource1.DataSource = countries;</code>

Bind ComboBox's DataSource to BindingSource's DataSource:

<code class="language-csharp">comboBox1.DataSource = bindingSource1.DataSource;</code>

Set ComboBox's DisplayMember and ValueMember to the corresponding attributes of the Country class:

<code class="language-csharp">comboBox1.DisplayMember = "Name";
comboBox1.ValueMember = "Name";</code>

ComboBox will now display the names of each country in the list. To retrieve the selected country, you can use the SelectedItem attribute of the ComboBox:

<code class="language-csharp">Country selectedCountry = (Country)comboBox1.SelectedItem;</code>

Note that for dynamic updates, your data structure should implement the IBindingList interface. It is recommended to use BindingList<T>.

Be sure to bind DisplayMember to a property rather than a public field to ensure correct display and functionality.

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