1. List<T> has more than 300 elements
2. Listview binding this List<T> when page show, but delay is more than 10s

Code:

List<app_process> saveList = new List<app_process>();

public ProcessPage() {
  InitializeComponent();

  saveList = getProcessDatas();

  this.processList.ItemsSource = saveList;
} 

I try to use Thread and dialog to optimize this problem but it is a failure.

List<app_process> saveList = new List<app_process>();
    public ProcessPage(){
       InitializeComponent();
      
        UserDialogs.Instance.ShowLoading("Loading");
        new Thread(new ThreadStart(() =>
            {
                saveList = getProcessDatas();
                this.processList.ItemsSource = saveList;
 
                Device.BeginInvokeOnMainThread(() =>
                {
                 UserDialogs.Instance.HideLoading();
                 });
            })).Start();
      
    } 

What's wrong with it? How can I solve it?

CodePudding user response：

Try overriding OnAppearing method and then run your processor async.

protected override async void OnAppearing()
{
   UserDialogs.Instance.ShowLoading("Loading");

   var data = await Task.Run(() => getProcessDatas());

   Device.BeginInvokeOnMainThread(() =>
   {
       this.processList.ItemsSource = data;
       UserDialogs.Instance.HideLoading();
   });
 }