Data grid is not updating after setting item source to null

Question

I have a datagrid that is bound to an observable collection, when I update the items in the observable collection the data grid is not updating. I know that I notify won't fire since i'm not changing the collection just the properties, so I am trying to set the item source to null and the rebinding it after it checks for updates, but this is not working. Also I have tried items.refresh to no avail. The only thing I have found that works is by renavigating back to the PendingChanges page.

To get an idea of how this works. I have a window that has a page in it, and at the bottom is a window that is framed in, when you click a button it navigates to the window that contains the datagrid (pending changes)

Class and Page that contains the datagrid

public PendingChanges(page blahh)
{
   InitializeComponent();
   Datagrid.ItemsSource = obvs_collection;
}
public string GetPendingChanges()
{
    PopulatePendingChanges();
    return NumberOfItemsPending + " items checked out";
}
private void PopulateCollection()
{
    //obvs_collection.Clear();  this doesn't work
    //Datagrid.ItemsSource = null this doesn't work 
    foreach (var path in localPath)
    {
        obvs_collection.Add(new PendingItem()
        {
            ID = blah.Replace("\\",""),
            Path = path.ToString()
        });
    }
}

Class/Page that frames in the page with the data grid

private void CheckChanges()
{
    _pendingChangesPage = new PendingChanges(blah);
    PendingChangesTb.Text = _pendingChangesPage.GetPendingChanges();
}

Answer 1

更新任何数据源以反映其更改时，需要使用其.Refersh（）函数刷新网格。

dataGrid.Items.Refresh();

Answer 2

I'm thinking you would probably want just a single instance instead of creating a new one everytime you check for changes.

Try this:

PendingChanges _pendingChangesPage;

public PendingChanges(page blahh)
{
   InitializeComponent();
   Datagrid.ItemsSource = obvs_collection;
   _pendingChangesPage = new PendingChanges(blah);
}

private void CheckChanges()
{
    PendingChangesTb.Text = _pendingChangesPage.GetPendingChanges();
}