RadListView.GetDataView now always returns null in MAUI

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Last Updated: 15 May 2024 08:13 by ANANDHA

ANANDHA

Created on: 14 May 2024 09:55

Category: UI for .NET MAUI

Type: Bug Report

RadListView.GetDataView now always returns null in MAUI

I recently migrated my code from Xamarin.forms to MAUI.
RadListView.GetDataView now always returns null in MAUI , its working fine in Xamarin.forms.

I am trying to close all the groups while loading, but facing a null exception with DATAVIEW

protected override void OnAppearing()
{
base.OnAppearing();
try
{
//collapse all
var dataView = MyRadListView.GetDataView();
dataView.CollapseAll();}}

Duplicated

This item is a duplicate of an already existing item. You can find the original item here:

RadListView.GetDataView now always returns null

2 comments

ANANDHA

Posted on: 15 May 2024 08:13

@Didi

Thanks first.

It works if I put in "Page_Loaded".

Regards,

Anandha Bhamini

ADMIN

Didi

Posted on: 15 May 2024 07:50

Hello ANANDHA,

I see you add the collapse all code inside the OnAppearing. This is too early, the control is not loaded on the page. MAUI and Xamarin are different frameworks.

I can suggest you add the collapse all code inside the page loaded event. So to be sure that the page is loaded, then execute logic to the elements inside the page.

public partial class MainPage : ContentPage
{
    public MainPage()
    {
        InitializeComponent();

        this.page.Loaded += Page_Loaded;
    }

    private void Page_Loaded(object? sender, EventArgs e)
    {
        Dispatcher.StartTimer(TimeSpan.FromMicroseconds(200), () => {
            var data = this.listView.GetDataView();
            if (data != null)
            {
                data.CollapseAll();
            }

            return false;
        });
    }
}

Regards,
Didi
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