[英]Xamarin forms ListView
如何在xamarin表单上对自定义Listview进行排序,说如果它具有日期和时间jason数据,您将如何进行设置,以便最新的日期显示在顶部
这是我的杰森反序列化
public class RootObject
{
public List<Feed> Feeds { get; set; }
}
public class Channel
{
public int Id { get; set; }
public string Name { get; set; }
public string Description { get; set; }
public string Latitude { get; set; }
public string Longitude { get; set; }
public string Field1 { get; set; }
public DateTime Created_at { get; set; }
public DateTime Updated_at { get; set; }
public string Elevation { get; set; }
public int Last_entry_id { get; set; }
}
public class Feed
{
public DateTime Created_at { get; set; }
public int Entry_id { get; set; }
public string Field1 { get; set; }
}
public partial class DripPage : TabbedPage
{
void Handle_Refreshing(object sender, System.EventArgs e)
{
postsListView.ItemsSource = _data;
postsListView.EndRefresh();
}
private const string Url = "https://thingspeak.com/channels/301726/field/1.json";
private HttpClient _client = new HttpClient();
private ObservableCollection<Feed> _data;
public DripPage()
{
InitializeComponent();
}
protected override async void OnAppearing()
{
var content = await _client.GetStringAsync(Url);
var data = JsonConvert.DeserializeObject<RootObject>(content);
_data = new ObservableCollection<Feed>(data.Feeds);
postsListView.ItemsSource = _data;
base.OnAppearing();
}
void OnAdd(object sender, System.EventArgs e)
{
}
void OnUpdate(object sender, System.EventArgs e)
{
}
void OnDelete(object sender, System.EventArgs e)
{
}
}
}
只需将dateandtime元素从最新到最旧的欢呼进行排序
使用LINQ( OrderByDescending
)订购Feeds
集合:
_data = new ObservableCollection<Feed>(data.Feeds.OrderByDescending(x => x.Created_at));
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