Xamarin表单：分组ObservableCollection

Question

I have a ListView binded to ObservableCollection<Request> . Here's Request class:

public class Request
{
    public int Id { get; set; }
    public string RequestName { get; set; }
    public string Provider { get; set; }
    public int Done { get; set; }
}

I have only 2 possible values in Done : 0 or 1 . Request s that have Done set to 0 to one group, others to other group. How is it possible to do this?

Answer 1

Here is how you would group it. You may need to enhance on this further to make it a bit more user friendly.

Grouped Property

private ObservableCollection<Grouping<String, Request>> _groupedList = null;
public ObservableCollection<Grouping<String, Request>> GroupedList {
    get {
        return _groupedList;
    }
    set {
        _groupedList = value;
        RaisePropertyChanged(() => GroupedList);
    }
}

Creating List

var list = new List<Request>();

var grouped = from Model in list
                         group Model by Model.Done into Group
                         select new Grouping<string, Request>(Group.Key, Group);

GroupedList = new ObservableCollection<Grouping<string, TModel>>(grouped);

The ListView Xaml

<ListView IsGroupingEnabled="true" HasUnevenRows="true">
    <ListView.GroupHeaderTemplate>
        <DataTemplate>
            <ViewCell>                
                <Label Text="{Binding Key}" VerticalOptions="Center"/>
            </ViewCell>
        </DataTemplate>
    </ListView.GroupHeaderTemplate>
    <ListView.ItemTemplate>
        <DataTemplate>
            <ViewCell>
                <ViewCell.View>
                <ContentView Padding="10">
                    <Label Text={Binding RequestName}" />
                </ContentView>
                </ViewCell.View>
            </ViewCell>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>