过滤

               < / telerikDataControls: RadListView >

public Filtering() {InitializeComponent();这一点。BindingContext = new ViewModel();listView.FilterDescriptors。添加(新的telerik . xamarinforms . datacontrolls . listview . delegatefilterdescriptor {Filter = this。AgeFilter});} private bool AgeFilter(对象参数){var age =((项目)参数).Age;返回年龄>= 25 &&年龄<= 35;｝

公共类ViewModel{公共ViewModel() {this。Items = GetData();} public ObservableCollection Items {get;设置;} private static ObservableCollection GetData() {var items = new ObservableCollection();物品。Add(new Item {Name = "Tom"， Age = 41});物品。添加(new Item {Name = "Anna"， Age = 32});物品。添加(new Item {Name = "Peter"， Age = 28}); items.Add(new Item { Name = "Teodor", Age = 39}); items.Add(new Item { Name = "Lorenzo", Age = 25 }); items.Add(new Item { Name = "Andrea", Age = 33}); items.Add(new Item { Name = "Martin", Age = 36 }); items.Add(new Item { Name = "Alexander", Age = 29}); items.Add(new Item { Name = "Maria", Age = 22 }); items.Add(new Item { Name = "Elena", Age = 27 }); items.Add(new Item { Name = "Stefano", Age = 44 }); items.Add(new Item { Name = "Jake", Age = 31 }); items.Add(new Item { Name = "Leon", Age = 28 }); return items; } }

公共类项目{公共字符串名称{获取;设置;}公共int年龄{获取;设置;}}

公共类ViewModel: INotifyPropertyChanged {private ObservableCollection filterDescriptors;private bool isFilterSwitchToggled;private List<事件>项;public ViewModel() {this。Items = this.GetItems();这一点。filterDescriptors = new ObservableCollection();}公共事件PropertyChangedEventHandler PropertyChanged;public ObservableCollection FilterDescriptors {get{返回this.filterDescriptors;} set {if (this。filterDescriptors != value){这个。filterDescriptors = value; OnPropertyChanged(); } } } public bool IsFilterSwitchToggled { get { return this.isFilterSwitchToggled; } set { if (this.isFilterSwitchToggled != value) { this.isFilterSwitchToggled = value; OnPropertyChanged(); } } } public List Items { get { return this.items; } set { if (this.items != value) { this.items = value; OnPropertyChanged(); } } } private List GetItems() { var results = new List(); results.Add(new Event() { Content = "Content of the item", Day = "Tommorow", Category = "A" }); results.Add(new Event() { Content = "This also happens today", Day = "Yesterday", Category = "A" }); results.Add(new Event() { Content = "More events today", Day = "Today", Category = "A" }); results.Add(new Event() { Content = "Go shopping after 19:00", Day = "Yesterday", Category = "B" }); results.Add(new Event() { Content = "You are now free to do whathever", Day = "Today", Category = "B" }); results.Add(new Event() { Content = "For tommorow", Day = "Today", Category = "B" }); results.Add(new Event() { Content = "It is a free day", Day = "Yesterday", Category = "C" }); results.Add(new Event() { Content = "Go have some fun", Day = "Tommorow", Category = "C" }); results.Add(new Event() { Content = "Party", Day = "Tommorow", Category = "C" }); return results; } private void OnPropertyChanged([CallerMemberName] string propertyName = null) { this.UpdateExistingFilterDescriptor(propertyName); this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName)); } private void UpdateExistingFilterDescriptor(string propertyName) { if (this.FilterDescriptors == null) return; if (this.FilterDescriptors.Count == 0) { this.FilterDescriptors.Add(new DelegateFilterDescriptor() { Filter = new Func((item) => ((Event)item).Category.Equals("A")) }); } if(propertyName.Equals(nameof(IsFilterSwitchToggled))) { ((DelegateFilterDescriptor)this.FilterDescriptors.FirstOrDefault()).Filter = this.isFilterSwitchToggled ? new Func((item) => ((Event)item).Category.Equals("C")) : new Func((item) => ((Event)item).Category.Equals("A")); } } }

公共类事件{公共字符串内容{获取;设置;}公共字符串日期{获取;设置;}公共字符串类别{获取;设置;}}

                            .使用实例