C# ComboBox Data Binding: Displaying a List of Objects
This guide demonstrates how to populate a C# ComboBox with a list of objects, displaying a specific property (e.g., "Name") of each object as an item in the dropdown. We'll use a BindingSource
to manage the data connection.
Step 1: Defining the Data Class and List
First, create a class (e.g., Country
) with the properties you want to represent in your ComboBox. Here's an example with a Name
property and a list of City
objects:
public class Country { public string Name { get; set; } public IList<City> Cities { get; set; } = new List<City>(); } public class City { public string Name { get; set; } }
Now, create a list of Country
objects:
List<Country> countries = new List<Country>() { new Country { Name = "UK" }, new Country { Name = "Australia" }, new Country { Name = "France" } };
Step 2: Setting up the BindingSource
Create a BindingSource
object and assign your countries
list as its data source:
BindingSource bindingSource = new BindingSource(); bindingSource.DataSource = countries;
Step 3: Connecting the BindingSource to the ComboBox
Link the BindingSource
to your ComboBox:
comboBox1.DataSource = bindingSource;
Step 4: Configuring Display and Value Members
Specify the property to display in the ComboBox dropdown (DisplayMember
) and the property to retrieve when an item is selected (ValueMember
):
comboBox1.DisplayMember = "Name"; comboBox1.ValueMember = "Name"; // Or another suitable property if needed
Step 5: Accessing the Selected Item
To get the selected Country
object:
Country selectedCountry = (Country)comboBox1.SelectedItem;
Handling Dynamic Updates (IBindingList)
For dynamic updates (adding or removing items from the list), ensure your data source implements the IBindingList
interface. BindingList<t></t>
is a good choice:
BindingList<Country> countries = new BindingList<Country>() { /* ... your countries ... */ }; bindingSource.DataSource = countries;
This approach ensures that changes to the underlying countries
list are automatically reflected in the ComboBox.
The above is the detailed content of How to Bind a List of Objects to a ComboBox in C#?. For more information, please follow other related articles on the PHP Chinese website!

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