C# ObservableCollection.Add方法代码示例

        public void TestCollectionSync()
        {
            string item0 = "Item0";
            string item1 = "Item1";
            string item2 = "Item2";
            string item3 = "Item3";

            ObservableCollection<string> collection = new ObservableCollection<string>();

            HelperLabeledViewModelCollection viewModel = new HelperLabeledViewModelCollection(null, collection, o => o);

            collection.Add(item0);
            collection.Add(item1);
            collection.Add(item3);
            Assert.IsTrue(CompareCollectionValues(collection, viewModel), "Add did not work.");

            collection.Insert(2, item2);
            Assert.IsTrue(CompareCollectionValues(collection, viewModel), "Insert did not work.");

            collection.Remove(item3);
            Assert.IsTrue(CompareCollectionValues(collection, viewModel), "Remove did not work.");

            collection.Move(0, 1);
            Assert.IsTrue(CompareCollectionValues(collection, viewModel), "Move did not work.");

            collection.Clear();
            Assert.IsTrue(CompareCollectionValues(collection, viewModel), "Clear did not work.");
        }

		public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
		{
			var results = new ObservableCollection<object>();
			string[] parameters;
			if (parameter is string)
			{
				parameters = ((string)parameter).Split(',');
				for (var i = 0; i < parameters.Length; i++)
				{
					parameters[i] = parameters[i].Trim();
				}
			}
			else
			{
				parameters = new string[0];
			}
			var index = 0;
			foreach (var value in values)
			{
				if (value is IEnumerable)
				{
					results.Add(index < parameters.Length
									? new BindingGroup(value as IEnumerable, parameters[index])
									: value);
				}
				else
				{
					results.Add(value);
				}
				index++;
			}

			return results;
		}

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            _permission_List = new ObservableCollection<SYSPermission>();
            _permission_List2 = new List<sys_permission_rpc>();
            /*
            ad 广告操作
            community 社区操作
            entrance 编辑门禁
            role 角色管理操作
            user 用户操作
            */
            _permission_List.Add(new SYSPermission(new sys_permission_rpc() { name = "ad", desc = "广告操作" }));
            _permission_List.Add(new SYSPermission(new sys_permission_rpc() { name = "community", desc = "社区操作" }));
            _permission_List.Add(new SYSPermission(new sys_permission_rpc() { name = "entrance", desc = "编辑门禁" }));
            _permission_List.Add(new SYSPermission(new sys_permission_rpc() { name = "role", desc = "角色管理操作" }));
            _permission_List.Add(new SYSPermission(new sys_permission_rpc() { name = "user", desc = "用户操作" }));

            //var list = (Application.Current as App).Client.Proxy.get_permissions();
            //foreach(var item in list)
            //{
            //    _permission_List.Add(new SYSPermission(item));
            //}
            _permission_List2.Add(new sys_permission_rpc() { name = "user", desc = "用户操作" });
            PermissionList = _permission_List;
            SelectedList = _permission_List2;
            //listView.ItemsSelected = SelectedList;
        }

        public ProductCommentsViewModel()
        {
            ProductDisplayed = new Product()
            {
                Name = "Bolacha Maria"
            };

            UserRatings = new ObservableCollection<UserRating>();

            UserRatings.Add(new UserRating(){
                Id="1",
                Like = true,
                Comment="Me fez super bem",
                Profile=EnumProfile.Lactose,
                User=new User(){
                    Id="1",
                    Name="Zé Carioca",
                    Profiles = EnumProfile.Lactose | EnumProfile.Wheat
                }
            });

            UserRatings.Add (new UserRating () {
                Id = "21",
                Like = true,
                Comment = "Gostei do produto sem lactose",
                Profile = EnumProfile.Lactose,
                User = new User () {
                    Id = "21",
                    Name = "Zé Colméia",
                    Profiles =  EnumProfile.Lactose | EnumProfile.Wheat
                }
            });
        }

        public LeftPaneViewModel()
        {
            _assetTypesList = new ObservableCollection<AssetType>();
            _assetTypesList.Add(new AssetType { Name = "Bond", Value = "Bond" });
            _assetTypesList.Add(new AssetType { Name = "Stock", Value = "Stock" });

            this.addAssetCommand = new DelegateCommand(this.AddAssetExecute, this.AddAssetCanExecute);
        }

 public void Test_ObservableCollection_Count()
 {
     var list = new ObservableCollection<int>();
     Assert.Equal(0, list.Count);
     list.Add(3);
     Assert.Equal(1, list.Count);
     list.Add(3);
     Assert.Equal(2, list.Count);
 }

    static void Main()
    {
        ObservableCollection<string> items = new ObservableCollection<string>();
        items.CollectionChanged += items_CollectionChanged;

        items.Add("new item");
        items.Add("another item");
        items.Add("one more item");
        items[1] = "new value";
        items.RemoveAt(0);
    }

        public MainWindowViewModel()
        {
            _SelectableItemCollection = new ObservableCollection<SelectableItem>();
            _SelectableItemCollection.Add(new SelectableItem() { IsSelected = false, Name = "One" });
            _SelectableItemCollection.Add(new SelectableItem() { IsSelected = true, Name = "Two" });
            _SelectableItemCollection.Add(new SelectableItem() { IsSelected = false, Name = "Three" });

            _DateValue = DateTime.Now;

            _ExitCommand = new DelegateCommand(DoExit, CanDoExit);
        }

        public LibraryViewModel()
        {
            Sources = new ObservableCollection<Source>();
            Mangas = new ObservableCollection<MangaViewModel>();
            Sources.Add(new MangaHereSource());
            Sources.Add(new MangaReaderSource());
            UpdateMangasWithRecentChaptersCommand = new Command(UpdateMangasWithRecentChapters, true);
            UpdateMangasWithRecentChapters();
            ListCollectionView _customerView = CollectionViewSource.GetDefaultView(Mangas) as ListCollectionView;
            //_customerView.CustomSort = new MangaSorter(); 

        }

        public void ShouldSynchroniseChangedListAddMultipleSelectedItems()
        {
            //Arrange
              ObservableCollection<string> secondSelectedNames = new ObservableCollection<string>();

              // Act
              MultiSelectorBehaviours.SetSynchronizedSelectedItems(listView, (IList)secondSelectedNames);
              secondSelectedNames.Add(this.names.First());
              secondSelectedNames.Add(this.names.Last());

              // Assert
              this.listView.SelectedItems.ShouldBeEquivalentTo(secondSelectedNames);
        }

        public void InitializeMarks()
        {
            marks = new ObservableCollection<Mark>();

            // add default marks
            marks.Add(new Mark() { Name = "Herz" });
            marks.Add(new Mark() { Name = "Leber" });
            marks.Add(new Mark() { Name = "Nieren" });

            // binding
            marksListBox.ItemsSource = marks;

            // update labels in project
            updateLabels();
        }

        public void CanFilterCollection()
        {
            var originalCollection = new ObservableCollection<ItemMetadata>();
            IViewsCollection viewsCollection = new ViewsCollection(originalCollection, x => x.Name == "Posible");

            originalCollection.Add(new ItemMetadata(new object()));

            Assert.AreEqual(0, viewsCollection.Count());

            var item = new object();
            originalCollection.Add(new ItemMetadata(item) { Name = "Posible" });
            Assert.AreEqual(1, viewsCollection.Count());

            Assert.AreSame(item, viewsCollection.First());
        }

        public void PopulateReminderList()
        {
            //Populate complete list inside Reminder list
            ReminderItemList = new ObservableCollection<ReminderItem>();

            ReminderItemList.Add(new ReminderItem { Id = 1, Description = "desc1" });
            ReminderItemList.Add(new ReminderItem { Id = 2, Description = "desc2" });
            ReminderItemList.Add(new ReminderItem { Id = 3, Description = "desc3" });

            //foreach (var item in new ReminderItemDatabase().GetItems())
            //{
            //    ReminderList.Add(new ReminderListItem { Id = item.Id, VehiclePhoto = item.VehicleType + ".png", Name = item.Name, NextServiceDate = item.NextServiceDate.ToString("d") });

            //}
        }

		public void InitializeAvailableDevices(GKGuardZone zone)
		{
			AvailableDevices = new ObservableCollection<GuardZoneDeviceViewModel>();
			foreach (var device in GKManager.Devices)
			{
				if (device.Driver.HasGuardZone && !zone.GuardZoneDevices.Any(x => x.DeviceUID == device.UID))
				{
					if (device.GuardZones.Count > 0 || (device.IsInMPT && !GlobalSettingsHelper.GlobalSettings.ShowMPTsDevices)
							|| (device.ZoneUIDs.Count > 0 && !GlobalSettingsHelper.GlobalSettings.ShowZonesDevices)
							|| (device.Door != null && !GlobalSettingsHelper.GlobalSettings.ShowDoorsDevices))
						continue;

					var guardZoneDevice = new GKGuardZoneDevice
					{
						DeviceUID = device.UID,
						Device = device
					};
					var deviceViewModel = new GuardZoneDeviceViewModel(guardZoneDevice);
					AvailableDevices.Add(deviceViewModel);
				}
			}

			OnPropertyChanged(() => AvailableDevices);
			SelectedAvailableDevice = AvailableDevices.FirstOrDefault();
		}

        public ObservableCollection<LinkageSetOR> selectAllDate()
        {
            string sql = @"select tl.*,t.StationName,d.DeviceName,c.ChannelName
             ,tLine.StationName as LineStationName,dLine.DeviceName as LineDeviceName,cLine.ChannelName  as LineChannelName
            from t_LinkageSet tl
            inner join t_Station t  on tl.StationID=t.StationID
            inner join t_Device d on tl.DeviceID=d.DeviceID
            inner join t_Channel c on tl.ChannelNo=c.ChannelNo and c.DeviceID=d.DeviceID
            inner join t_Station tLine  on tl.LinkageStationID=tLine.StationID
            inner join t_Device dLine on tl.LinkageDeviceID=dLine.DeviceID
            inner join t_Channel cLine on tl.LinkageChannelNo=cLine.ChannelNo and cLine.DeviceID=dLine.DeviceID";

            DataTable dt = null;
            try
            {
                dt = db.ExecuteQuery(sql);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            ObservableCollection<LinkageSetOR> _List = new ObservableCollection<LinkageSetOR>();
            foreach (DataRow dr in dt.Rows)
            {
                LinkageSetOR obj = new LinkageSetOR(dr);
                _List.Add(obj);
            }
            return _List;
        }