Xamarin Forms ListView Data Binding nested objects

Question

I have simple Page with ListView

<ListView x:Name="ForecastView">
    <ListView.ItemTemplate>
        <DataTemplate>
            <TextCell Text="{Binding mainData.Temperature}" />
        </DataTemplate>
    </ListView.ItemTemplate>
 </ListView>

I'm trying to bind nested property by using . to access it. My item source:

private ObservableCollection<ForecastData> forecast = new ObservableCollection<ForecastData>();

I'm setting it in constructor:

ForecastView.ItemsSource = forecast;

My model is looking like this:

public class ForecastData
    {
        public MainData mainData;
.....
public class MainData
    {
        public double Temperature;
...

After REST call my list is populated by elements (I can select them), but text property is blank. Can You help me figure out what is wrong. I have tried everything and nothing helps (I have read all similar question on Stack Overflow).

Try to read here: http://stackoverflow.com/questions/36985634/xamarin-forms-databinding-separator, http://stackoverflow.com/questions/31041542/how-to-bind-to-a-nested-class-wpf and http://stackoverflow.com/questions/14546347/how-to-use-nested-class-in-wpf-xaml. — EgoPingvina, Dec 06 '16 at 12:49
you can only bind to public properties (with getters and setters) not public variables or methods — Jason, Dec 06 '16 at 13:02

score 7 · Accepted Answer · answered Dec 06 '16 at 13:07

7

The problem is that you are trying to bind to a public field.

You can only bind to properties.

So change:

public MainData mainData;

To:

public MainData mainData { get; set; }

And it should work!

Also for Temperature of course.

answered Dec 06 '16 at 13:07

Gerald Versluis

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I love You Gerald! – Prettygeek Dec 06 '16 at 13:11
1

Well thank you! I've stared at it for sometime myself as well, after that you never forget! – Gerald Versluis Dec 06 '16 at 13:12
Yes, full two days of nerves. Now I will remember forever! – Prettygeek Dec 06 '16 at 13:16
How to bind information when MainData model has subclass which is a list? – Thamarai T Dec 25 '20 at 08:01

Xamarin Forms ListView Data Binding nested objects

1 Answers1