如何在C＃中的Datagridview中添加新行？

Question

I use following method to build datasource:

BindingList<Person> people = new BindingList<Person>();
foreach (var tag in names)
{
    people.Add(new Person
    {
        Id = tag.ID,
        Name = tag.Name,
        Tag = tag.Ref
    });
}
dataGridView1.DataSource = people;

How to add a new row in this GridView?

I tried this, but it reloads all data:

 BindingList<Person> people = new BindingList<Person>();


            //set datagridview datasource
            dataGridView1.DataSource = people;
            //add new product, named Cookie, to list ant boom you'll see it in your datagridview
            people.Add(new Person());


            dataGridView1.DataSource = people;

Answer 1

I'll assume you're working with WinForms application...

First of all, put BindingList<Person> people = new BindingList<Person>(); declaration in scope of your class, so that it's visible in all methods. Then, lets assume you're populating DataGridView on FormLoad event, and adding other on button1_Click :

So, that should be done like this:

public partial class Form1 : Form
{
    //declare new persons list here, not in method which loads data into list.
    BindingList<Person> persons = new BindingList<Person>();

    public Form1()
    { 
        InitializeComponent();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
        //your initial loading is here, I  guess
        people = new BindingList<Person>();

        foreach (var tag in names)
        {
            people.Add(new Person
            {
                Id = tag.ID,
                Name = tag.Name,
                Tag = tag.Ref
            });
        }
        dataGridView1.DataSource = people;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Person p = new Person() 
        {
            Id = 10,
            Name = "NewPersonName",
            Tag = 123
        }
        //you can see that I'm not making new instance of person list, just adding new Person inside
        persons.Add(p);
        dataGridView1.DataSource = people;
    }

}