How to refresh the DataSource on a WinForms DataGridView?

问题

I populate the GridView.DataSource from a EntityFramework Model:

gwTimeLog.DataSource = _entities.TimeLogs;

When a new row is added to the _entities, I try to update the grid (tried using the same statement as above, setting it null, then back to _entities.TimeLogs, etc...), but the grid simply won't update. Even though _entities.TimeLogs actually does contain the new rows.

What am I missing?

回答1:

OLD ANSWER: Did you try calling GridView.DataBind()?

Woops, I thought this was a WebForms DataGrid.

If you're on WinForms, you might want to look into the BindingSource class. Binding to that class instead of straight to your list will provide update notification, etc.

The following code works for me:

        List<Person> names = new List<Person>();
        names.Add(new Person(){
            FirstName = "Steve",
            LastName = "Jobs"
        });
        names.Add(new Person()
        {
            FirstName = "Bill",
            LastName = "Gates"
        });

        BindingSource source = new BindingSource();
        source.DataSource = names;
        dataGridView1.DataSource = source;

        names.Add(new Person()
        {
            FirstName = "Steve",
            LastName = "Balmer"
        });

        source.ResetBindings(false);

回答2:

The answer is to have the gridview connected to the BindingList rather than the List.

回答3:

This works for me:

dataGridView.DataSource = null;
dataGridView.DataSource = listOfSomething;

回答4:

 grid.EndEdit();
 BindingSource.EndEdit();
 _entities = new dbEntities();
 firmeBindingSource.DataSource=_entities.TimeLogs;

来源：https://stackoverflow.com/questions/2015327/how-to-refresh-the-datasource-on-a-winforms-datagridview

标签

winforms

entity-framework

datagridview

refresh