Binded DataGridView to List<T> not showing data
This is the code I have (it a very simple example):
public partial class Form1 : Form
{
List<Person> listPersons;
public Form1()
{
InitializeComponent();
listPersons = new List<Person>();
dataGridView1.DataSource = listPersons;
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text.Length > 0)
{
Person p = new Person();
p.Name = textBox1.Text;
listPersons.Add(p);
}
}
}
class Person
{
public string Name { get; set; }
}
When you press the button, data IS added to the list, but it doesn't show up in the DataGridView . What am I missing?
I have tried setting AutoGenerateColumns and VirtualMode to true , but that didn't resolve the issue either.
It's been awhile, and I've switched jobs since working on WinForms code that tried to bind List<T>s to DataGridViews. If I recall correctly, whatever you bind needs to implement IBindingList, which List<T> doesn't. I may be wrong on that.
In any case, what I used was BindingListView, which was incredibly fast and easy. You just do:
List<Customer> customers = GetCustomers();
BindingListView<Customer> view = new BindingListView<Customer>(customers);
dataGridView1.DataSource = view;
And you're done. I haven't looked at the source in a few years, but I believe it wraps the List<T> with a class that implements IBindingList.
But if I use only BindingList<T> instead of List<T> it does work.
Example code:
BindingList<Person> bl;
public Form1()
{
InitializeComponent();
bl = new BindingList<Person>();
dataGridView1.DataSource = bl;
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text.Length > 0)
{
Person p = new Person();
p.Name = textBox1.Text;
bl.Add(p);
textBox1.Text = "";
textBox1.Focus();
}
}
But I would still like to figure out how to show data in DataGridView after bindng it with List.
集中您的FillGrid功能并在您想更新网格时调用它
public Form1()
{
InitializeComponent();
listPersons = new List<Person>();
FillGrid();
}
private void button1_Click(object sender, EventArgs e)
{
if (textBox1.Text.Length > 0)
{
Person p = new Person();
p.Name = textBox1.Text;
listPersons.Add(p);
FillGrid();
}
}
private void FillGrid()
{
dataGridView1.DataSource = listPersons;
}
上一篇: 申请中的请求对象