How to sort items datetime with grouping in .NET MAUI ListView?
.NET MAUI ListView supports Sorting and Grouping the items based on the DateTime property.
Grouping with sorting by Year
Sort and group the items using KeySelector based on returning the year value of the DateTime property.
The following code, sample explains how to sort the items along with the group header in ascending order based on the DateTime property.
XAML
Define the SfListView with the GroupHeaderTemplate.
<listView:SfListView x:Name="listView" ItemsSource="{Binding Items}" IsStickyGroupHeader="False" ItemSize="50">
<listView:SfListView.GroupHeaderTemplate>
<DataTemplate>
<Label Text= "{Binding Key}" BackgroundColor="Teal" FontSize="22" FontAttributes="Bold" TextColor="White"/>
</DataTemplate>
</listView:SfListView.GroupHeaderTemplate>
</listView:SfListView>
C#
public class Behavior:Behavior<ContentPage>
{
#region Fields
private Syncfusion.Maui.ListView.SfListView listView;
#endregion
#region Overrides
protected override void OnAttachedTo(ContentPage bindable)
{
listView = bindable.FindByName<Syncfusion.Maui.ListView.SfListView>("listView");
listView.DataSource.GroupDescriptors.Add(new GroupDescriptor()
{
PropertyName = "DateOfBirth",
KeySelector = (object obj1) =>
{
var item = (obj1 as Contacts);
return item.DateOfBirth.Year;
},
});
this.listView.DataSource.SortDescriptors.Add(new SortDescriptor()
{
PropertyName = "DateOfBirth",
Direction = ListSortDirection.Ascending
});
base.OnAttachedTo(bindable);
}
protected override void OnDetachingFrom(ContentPage bindable)
{
listView = null;
base.OnDetachingFrom(bindable);
}
#endregion
}
Grouping with sorting by Month and Year
Create groups using KeySelector based on returning the year and month value of the DateTime property while sorting the items, and groups are sorted based on the year and months of the DateTime property by using Comparer.
C#
class CustomGroupComparer : IComparer<GroupResult>, ISortDirection
{
public CustomGroupComparer()
{
this.SortDirection = ListSortDirection.Ascending;
}
public ListSortDirection SortDirection
{
get;
set;
}
public int Compare(GroupResult x, GroupResult y)
{
DateTime xvalue = Convert.ToDateTime(x.Key);
DateTime yvalue = Convert.ToDateTime(y.Key);
// Group results are compared and return the SortDirection
if (xvalue.CompareTo(yvalue) > 0)
return SortDirection == ListSortDirection.Ascending ? 1 : -1;
else if (xvalue.CompareTo(yvalue) == -1)
return SortDirection == ListSortDirection.Ascending ? -1 : 1;
else
return 0;
}
}
C#
public class Behavior:Behavior<ContentPage>
{
#region Fields
private Syncfusion.Maui.ListView.SfListView listView;
#endregion
#region Overrides
protected override void OnAttachedTo(ContentPage bindable)
{
listView = bindable.FindByName<Syncfusion.Maui.ListView.SfListView>("listView");
listView.DataSource.GroupDescriptors.Add(new GroupDescriptor()
{
PropertyName = "DateOfBirth",
KeySelector = (object obj1) =>
{
var item = (obj1 as Contacts);
return item.DateOfBirth.Month + "/" + item.DateOfBirth.Year;
},
Comparer = new CustomGroupComparer()
});
listView.DataSource.SortDescriptors.Add(new SortDescriptor()
{
PropertyName = "DateOfBirth",
Direction = ListSortDirection.Ascending
});
base.OnAttachedTo(bindable);
}
protected override void OnDetachingFrom(ContentPage bindable)
{
listView = null;
base.OnDetachingFrom(bindable);
}
#endregion
}
The following screenshots illustrate how to sort, and group based on year and month/year.
Take a moment to peruse the documentation to learn more about SfListView with code examples.
Conclusion
I hope you enjoyed learning about how to sort items datetime with grouping in .NET MAUI ListView.
You can refer to our .NET MAUI ListView’s feature tour page to know about its other groundbreaking feature representations. You can also explore our .NET MAUI ListView documentation to understand how to present and manipulate data.
For current customers, you can check out our WinForms components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our .NET MAUI ListView and other .NET MAUI components.
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