Get each listview's row height

Dimitris Christoforidis 301

Hello and hope everyone doing well, i need to calculate each listview's row height. My listivew has uneven rows.
Or if it is possible to get all rows height by once. Thank you

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 72,336 Reputation points Microsoft Vendor

2021-08-31T02:37:53.997+00:00

if it is possible to get all rows height by once.

I am afraid this answer is no. If rows do not appear in the screen, row cannot be rendered, so rows' height we cannot get it. I create a demo, I get the View height in the <ViewCell Appearing="ViewCell_Appearing" >, But I find I cannot get height when Row appear at the first time, but I can get height at the second time.

Dimitris Christoforidis 301

Thank you LeonLu. I tried view cell appearing but i am getting always height = -1.
Here is My code:

<StackLayout>
    <Button Clicked="Button_Clicked"/>
    <ListView x:Name="test" HasUnevenRows="True">
        <ListView.ItemTemplate>
            <DataTemplate>
                <ViewCell Appearing="ViewCell_Appearing">
                    <StackLayout >
                        <Label Text="{Binding Name}"/>
                    </StackLayout>
                </ViewCell>
            </DataTemplate>
        </ListView.ItemTemplate>
    </ListView>
</StackLayout>


 public class Customer
    {
        public string Name { get; set; }
    }
    private void Button_Clicked(object sender, EventArgs e)
    {
        var items = new ObservableCollection<Customer>();
        items.Add(new Customer { Name = "Dimitris" });

        test.ItemsSource = items;
    }
    private async void ViewCell_Appearing(object sender, EventArgs e)
    {
        var ss = sender as ViewCell;
        await DisplayAlert("", ss.Height.ToString(), "OK");
    }

Dimitris Christoforidis 301 Reputation points

2021-08-31T11:55:59.21+00:00
Or if it is possible to get each row height after appears in screen.
Example

foreach (var row in listView) { }
Leon Lu (Shanghai Wicresoft Co,.Ltd.) 72,336 Reputation points Microsoft Vendor

2021-09-01T05:33:35.73+00:00
I set CachingStrategy="RecycleElement", then here is my onAppearing code. Please notice, when your row appear at the first time, the height value is -1, You can get the height value at the second appearing time,

private void ViewCell_Appearing(object sender, EventArgs e) { var cell = sender as ViewCell; var myView=cell.View; var getHeight= myView.Height; Console.WriteLine("======"+ getHeight + "==========="); }
Dimitris Christoforidis 301 Reputation points

2021-09-01T08:20:37.123+00:00

ΤThank you LeonLu!! Is there any code which i can trigger Appearing event programmaticaly?
Leon Lu (Shanghai Wicresoft Co,.Ltd.) 72,336 Reputation points Microsoft Vendor

2021-09-02T09:27:21.34+00:00

I am afraid this answer is No, ViewCell's Appearing method is a lifecycle method, we can not use C# code to trigger it

Share via

Get each listview's row height