IEditableCollectionViewAddNewItem 接口

定义

定义 CollectionView 所实现的方法和属性,它们可用于指定添加特定类型的项。Defines methods and properties that a CollectionView implements to enable specifying adding items of a specific type.

public interface class IEditableCollectionViewAddNewItem : System::ComponentModel::IEditableCollectionView
public interface IEditableCollectionViewAddNewItem : System.ComponentModel.IEditableCollectionView
type IEditableCollectionViewAddNewItem = interface
    interface IEditableCollectionView
Public Interface IEditableCollectionViewAddNewItem
Implements IEditableCollectionView
派生
实现

示例

下面的示例使用户能够将各种类型的项添加到集合中。The following example enables a user to add various types of items to a collection. 用户可以输入新项并提交该项或取消该事务。The user can enter a new item and submit the entry or cancel the transaction. 该示例IEditableCollectionViewAddNewItem ListBox从的Items属性获取, 并创建一个对象, 该对象的类型由用户决定。The example gets an IEditableCollectionViewAddNewItem from the Items property of a ListBox and creates an object, whose type is determined by the user. 然后, 该示例调用AddNewItem方法将对象添加到集合中。Then the example calls the AddNewItem method to add the object to the collection.

using System;
using System.ComponentModel;
using System.Windows;

namespace IEditableCollectionViewAddItemExample
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            IEditableCollectionViewAddNewItem viewToAddDisparateItems =
                catalogList.Items as IEditableCollectionViewAddNewItem;

            if (!viewToAddDisparateItems.CanAddNewItem)
            {
                MessageBox.Show("You cannot add items to the list.");
                return;
            }

            // Create a window that prompts the user to enter a new
            // item to sell.
            AddItemWindow win = new AddItemWindow();

            // Create an item, depending on which RadioButton is selected.
            // Radio buttons correspond to book, cd, dvd, or other.
            LibraryItem newItem;

            if ((bool)book.IsChecked)
            {
                newItem = new Book("Enter the book title", "Enter an Author", "Enter a Genre",
                    "Enter a call number", DateTime.Now + new TimeSpan(21, 0, 0, 0));
            }
            else if ((bool)cd.IsChecked)
            {
                newItem = new MusicCD("Enter the Album", "Enter the artist", 0, "CD.******",
                    DateTime.Now + new TimeSpan(14, 0, 0, 0));
            }

            else if ((bool)dvd.IsChecked)
            {
                newItem = new MovieDVD("Enter the movie title", "Enter the director",
                    "Enter the genre", new TimeSpan(), "DVD.******",
                    DateTime.Now + new TimeSpan(7, 0, 0, 0));
            }
            else
            {
                newItem = new LibraryItem("Enter the title", "Enter the call number",
                        DateTime.Now + new TimeSpan(14, 0, 0, 0));
            }

            // Add the new item to the collection by calling
            // IEditableCollectionViewAddNewItem.AddNewItem.
            // Set the DataContext of the AddItemWindow to the
            // returned item.
            win.DataContext = viewToAddDisparateItems.AddNewItem(newItem);

            // If the user submits the new item, commit the new
            // object to the collection.  If the user cancels 
            // adding the new item, discard the new item.
            if ((bool)win.ShowDialog())
            {
                viewToAddDisparateItems.CommitNew();
            }
            else
            {
                viewToAddDisparateItems.CancelNew();
            }
        }
    }
}
Imports System.ComponentModel
Imports System.Windows

Partial Class Window1
    Public Sub New()
        InitializeComponent()
    End Sub

    Private Sub Button_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)

        Dim viewToAddDisparateItems As IEditableCollectionViewAddNewItem =
            TryCast(catalogList.Items, IEditableCollectionViewAddNewItem)

        If Not viewToAddDisparateItems.CanAddNewItem Then
            MessageBox.Show("You cannot add items to the list.")
            Exit Sub
        End If

        ' Create a window that prompts the user to enter a new 
        ' item to sell. 
        Dim win As New AddItemWindow()

        ' Create an item, depending on which RadioButton is selected. 
        ' Radio buttons correspond to book, cd, dvd, or other. 
        Dim newItem As LibraryItem

        If CBool(Book.IsChecked) Then
            newItem = New Book("Enter the book title", "Enter an Author",
                "Enter a Genre", "Enter a call number",
                DateTime.Now + New TimeSpan(21, 0, 0, 0))
        ElseIf CBool(cd.IsChecked) Then
            newItem = New MusicCD("Enter the Album", "Enter the artist",
                0, "CD.******", DateTime.Now + New TimeSpan(14, 0, 0, 0))

        ElseIf CBool(dvd.IsChecked) Then
            newItem = New MovieDVD("Enter the movie title",
                "Enter the director", "Enter the genre", New TimeSpan(),
                "DVD.******", DateTime.Now + New TimeSpan(7, 0, 0, 0))
        Else
            newItem = New LibraryItem("Enter the title",
                "Enter the call number",
                DateTime.Now + New TimeSpan(14, 0, 0, 0))
        End If

        ' Add the new item to the collection by calling 
        ' IEditableCollectionViewAddNewItem.AddNewItem. 
        ' Set the DataContext of the AddItemWindow to the 
        ' returned item. 
        win.DataContext = viewToAddDisparateItems.AddNewItem(newItem)

        ' If the user submits the new item, commit the new 
        ' object to the collection. If the user cancels 
        ' adding the new item, discard the new item. 
        If CBool(win.ShowDialog()) Then
            viewToAddDisparateItems.CommitNew()
        Else
            viewToAddDisparateItems.CancelNew()
        End If
    End Sub
End Class

下面的示例为前面的示例创建用户界面。The following example creates the user interface for the previous example.

<StackPanel xmlns:src="clr-namespace:IEditableCollectionViewAddItemExample">
  <StackPanel.Resources>
    <src:LibraryCatalog x:Key="catalog"/>

    <!--Use AlternationConverter to create alternating background brushes
              to better distinguish each item. See AlternationConverter
              for more information.-->
    <AlternationConverter x:Key="BackgroundConverter">
      <SolidColorBrush>LightBlue</SolidColorBrush>
      <SolidColorBrush>LightGray</SolidColorBrush>
    </AlternationConverter>

    <!--The DataTemplate for LibraryItem, which is the base class
              of the other data types.-->
    <DataTemplate DataType="{x:Type src:LibraryItem}">
      <StackPanel>

        <TextBlock FontWeight="Bold">Item:</TextBlock>
        <TextBlock Text="{Binding Title, StringFormat={}Title: {0}}"/>
        <TextBlock>
          <TextBlock.Text>
            <MultiBinding StringFormat="{}Due Date: {0:d}    Call Number: {1}">
              <Binding Path="DueDate"/>
              <Binding Path="CallNumber"/>
            </MultiBinding>
          </TextBlock.Text>
        </TextBlock>
      </StackPanel>
    </DataTemplate>

    <!--The DataTemplate for Book.-->
    <DataTemplate DataType="{x:Type src:Book}">
      <StackPanel>

        <TextBlock FontWeight="Bold">Book:</TextBlock>
        <TextBlock Text="{Binding Title, StringFormat={}Title: {0}}"/>
        <TextBlock>
          <TextBlock.Text>
            <MultiBinding StringFormat="{}Author: {0}    Genre: {1}">
              <Binding Path="Author"/>
              <Binding Path="Genre"/>
            </MultiBinding>
          </TextBlock.Text>
        </TextBlock>
        <TextBlock>
          <TextBlock.Text>
            <MultiBinding StringFormat="{}Due Date: {0:d}    Call Number: {1}">
              <Binding Path="DueDate"/>
              <Binding Path="CallNumber"/>
            </MultiBinding>
          </TextBlock.Text>
        </TextBlock>
      </StackPanel>
    </DataTemplate>

    <!--The DataTemplate for MusicCD.-->
    <DataTemplate DataType="{x:Type src:MusicCD}">
      <StackPanel>

        <TextBlock FontWeight="Bold">Music CD:</TextBlock>
        <TextBlock Text="{Binding Title, StringFormat={}Title: {0}}"/>
        <TextBlock>
          <TextBlock.Text>
            <MultiBinding StringFormat="{}Artist: {0}    Tracks: {1}">
              <Binding Path="Artist"/>
              <Binding Path="NumberOfTracks"/>
            </MultiBinding>
          </TextBlock.Text>
        </TextBlock>
        <TextBlock>
          <TextBlock.Text>
            <MultiBinding StringFormat="{}Due Date: {0:d}    Call Number: {1}">
              <Binding Path="DueDate"/>
              <Binding Path="CallNumber"/>
            </MultiBinding>
          </TextBlock.Text>
        </TextBlock>
      </StackPanel>
    </DataTemplate>

    <!--The DataTemplate for MovieDVD-->
    <DataTemplate DataType="{x:Type src:MovieDVD}">
      <StackPanel>
        <TextBlock FontWeight="Bold">Movie DVD:</TextBlock>
        <TextBlock Text="{Binding Title, StringFormat={}Title: {0}}"/>
        <TextBlock>
          <TextBlock.Text>
            <MultiBinding StringFormat="{}Director: {0}    Genre: {1}    Length: {2}">
              <Binding Path="Director"/>
              <Binding Path="Genre"/>
              <Binding Path="Length"/>
            </MultiBinding>
          </TextBlock.Text>
        </TextBlock>
        <TextBlock>
          <TextBlock.Text>
            <MultiBinding StringFormat="{}Due Date: {0:d}    Call Number: {1}">
              <Binding Path="DueDate"/>
              <Binding Path="CallNumber"/>
            </MultiBinding>
          </TextBlock.Text>
        </TextBlock>
      </StackPanel>
    </DataTemplate>

  </StackPanel.Resources>

  <!--Bind a ListBox to a collection of LibraryItem objects. The collection 
          can hold objects any type that inherits from LibraryItem.-->
  <ListBox Name="catalogList" Height="350" AlternationCount="2" 
               ItemsSource="{StaticResource catalog}">

    <!--Use alternating background styles to better distinguish each item.
              See ItemsControl.AlternationIndex for more information.-->
    <ListBox.ItemContainerStyle>
      <Style TargetType="ListBoxItem">
        <Setter Property="Background" 
                Value="{Binding RelativeSource={RelativeSource Self},
                Path=(ItemsControl.AlternationIndex),
               Converter={StaticResource BackgroundConverter}}"/>

        <Setter Property="Margin" Value="3"/>
      </Style>
    </ListBox.ItemContainerStyle>
  </ListBox>

  <!--Enable the user to choose a type of item to add to the collection.-->
  <TextBlock>Select an item to add:</TextBlock>
  <RadioButton Name="book" >Book</RadioButton>
  <RadioButton Name="cd">Music CD</RadioButton>
  <RadioButton Name="dvd">DVD</RadioButton>
  <RadioButton>Other</RadioButton>

  <Button Margin="0,3,0,0" Click="Button_Click">Add Item</Button>
</StackPanel>

下面的示例创建一个AddItemWindow , 用户在其中添加新项的数据。The following example creates the AddItemWindow in which the user adds data for a new item.

<StackPanel Margin="10" Width="250">
  <StackPanel.Resources>

    <!--Add an event handler to select all text when
        a TextBox gets focus.-->
    <Style TargetType="TextBox">
      <EventSetter Event="GotFocus" Handler="TextBoxFocus"/>
    </Style>

    <!--Create a Template for HeaderedContentControl so the header is
        to the left of the content.-->
    <Style TargetType="HeaderedContentControl">
      <Setter Property="Margin" Value="2"/>
      <Setter Property="Focusable" Value="False"/>
      <Setter Property="Template">
        <Setter.Value>
          <ControlTemplate TargetType="HeaderedContentControl">
            <DockPanel LastChildFill="False">
              <ContentPresenter ContentSource="Header" DockPanel.Dock="Left" 
                                Focusable="False" VerticalAlignment="Center"/>
              <ContentPresenter ContentSource="Content" Margin="5,0,0,0" 
                                DockPanel.Dock="Right" VerticalAlignment="Center"/>
            </DockPanel>

          </ControlTemplate>
        </Setter.Value>
      </Setter>
    </Style>

    <Style TargetType="Button">
      <Setter Property="Width" Value="100"/>
      <Setter Property="Margin" Value="10,15,15,15"/>

    </Style>

    <!--The DataTemplate that is used when the user 
        enters a new LibraryItem.-->
    <DataTemplate DataType="{x:Type src:LibraryItem}">
      <StackPanel>
        <HeaderedContentControl Header="Title">
          <TextBox Width="150" Text="{Binding Path=Title, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Due Date">
          <TextBox Width="150" Text="{Binding Path=DueDate, StringFormat=d, Mode=TwoWay}">

          </TextBox>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Call Number">
          <TextBox Width="150" Text="{Binding Path=CallNumber, Mode=TwoWay}"/>
        </HeaderedContentControl>
      </StackPanel>
    </DataTemplate>

    <!--The DataTemplate that is used when the user 
        enters a new Book.-->
    <DataTemplate DataType="{x:Type src:Book}">
      <StackPanel>
        <HeaderedContentControl Header="Title">
          <TextBox Width="150" Text="{Binding Path=Title, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Author">
          <TextBox Width="150" Text="{Binding Path=Author, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Genre">
          <TextBox Width="150" Text="{Binding Path=Genre, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Due Date">
          <TextBox Width="150" Text="{Binding Path=DueDate, StringFormat=d, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Call Number">
          <TextBox Width="150" Text="{Binding Path=CallNumber, Mode=TwoWay}"/>
        </HeaderedContentControl>
      </StackPanel>
    </DataTemplate>

    <!--The DataTemplate that is used when the user 
        enters a new MusicCD.-->
    <DataTemplate DataType="{x:Type src:MusicCD}">
      <StackPanel>
        <HeaderedContentControl Header="Title">
          <TextBox Width="150" Text="{Binding Path=Title, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Artist">
          <TextBox Width="150" Text="{Binding Path=Artist, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Tracks">
          <TextBox Width="150" Text="{Binding Path=NumberOfTracks, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Due Date">
          <TextBox Width="150" Text="{Binding Path=DueDate, StringFormat=d, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Call Number">
          <TextBox Width="150" Text="{Binding Path=CallNumber, Mode=TwoWay}"/>
        </HeaderedContentControl>
      </StackPanel>
    </DataTemplate>

    <!--The DataTemplate that is used when the user 
        enters a new MovieDVD.-->
    <DataTemplate DataType="{x:Type src:MovieDVD}">
      <StackPanel>
        <HeaderedContentControl Header="Title">
          <TextBox Width="150" Text="{Binding Path=Title, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Director">
          <TextBox Width="150" Text="{Binding Path=Director, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Length">
          <TextBox Width="150" Text="{Binding Path=Length, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Genre">
          <TextBox Width="150" Text="{Binding Path=Genre, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Due Date">
          <TextBox Width="150" Text="{Binding Path=DueDate, StringFormat=d, Mode=TwoWay}"/>
        </HeaderedContentControl>
        <HeaderedContentControl Header="Call Number">
          <TextBox Width="150" Text="{Binding Path=CallNumber, Mode=TwoWay}"/>
        </HeaderedContentControl>
      </StackPanel>
    </DataTemplate>
  </StackPanel.Resources>

  <!--One of the DataTemplates that defined above 
      is used by this ContentControl when the window is created.-->
  <ContentControl Content="{Binding}" />

  <StackPanel Orientation="Horizontal">
    <Button IsDefault="True" Click="Submit_Click">_Submit</Button>
    <Button IsCancel="True">_Cancel</Button>
  </StackPanel>
</StackPanel>

下面的示例演示了的逻辑AddItemWindowThe following example shows the logic for the AddItemWindow.

using System.Windows;
using System.Windows.Controls;

namespace IEditableCollectionViewAddItemExample
{
    public partial class AddItemWindow : Window
    {
        public AddItemWindow()
        {
            InitializeComponent();
        }

        private void Submit_Click(object sender, RoutedEventArgs e)
        {
            DialogResult = true;
            Close();
        }

        // Select all text when the TextBox gets focus.
        private void TextBoxFocus(object sender, RoutedEventArgs e)
        {
            TextBox tbx = sender as TextBox;

            tbx.SelectAll();
        }
    }
}
Imports System.Windows
Imports System.Windows.Controls

Partial Public Class AddItemWindow
    Inherits Window
    Public Sub New()
        InitializeComponent()
    End Sub

    Private Sub Submit_Click(ByVal sender As Object, ByVal e As RoutedEventArgs)
        DialogResult = True
        Close()
    End Sub

    ' Select all text when the TextBox gets focus. 
    Private Sub TextBoxFocus(ByVal sender As Object, ByVal e As RoutedEventArgs)
        Dim tbx As TextBox = TryCast(sender, TextBox)

        tbx.SelectAll()
    End Sub
End Class

下面的示例显示在前面的示例中使用的数据类型和集合。The following example shows the data types and collection that is used in the previous examples.

using System;
using System.Collections.ObjectModel;
using System.ComponentModel;

namespace IEditableCollectionViewAddItemExample
{
    // LibraryItem implements INotifyPropertyChanged so that the 
    // application is notified when a property changes.  It 
    // implements IEditableObject so that pending changes can be discarded.
    public class LibraryItem : INotifyPropertyChanged, IEditableObject
    {
        struct ItemData
        {
            internal string Title;
            internal string CallNumber;
            internal DateTime DueDate;
        }

        ItemData copyData;
        ItemData currentData;

        public LibraryItem(string title, string callNum, DateTime dueDate)
        {
            Title = title;
            CallNumber = callNum;
            DueDate = dueDate;
        }

        public override string ToString()
        {
            return String.Format("{0}, {1:c}, {2:D}", Title, CallNumber, DueDate);
        }

        public string Title
        {
            get { return currentData.Title; }
            set
            {
                if (currentData.Title != value)
                {
                    currentData.Title = value;
                    NotifyPropertyChanged("Title");
                }
            }
        }

        public string CallNumber
        {
            get { return currentData.CallNumber; }
            set
            {
                if (currentData.CallNumber != value)
                {
                    currentData.CallNumber = value;
                    NotifyPropertyChanged("CallNumber");
                }
            }
        }

        public DateTime DueDate
        {
            get { return currentData.DueDate; }
            set
            {
                if (value != currentData.DueDate)
                {
                    currentData.DueDate = value;
                    NotifyPropertyChanged("DueDate");
                }
            }
        }

        #region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        protected void NotifyPropertyChanged(String info)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(info));
            }
        }

        #endregion

        #region IEditableObject Members

        public virtual void BeginEdit()
        {
            copyData = currentData;
        }

        public virtual void CancelEdit()
        {
            currentData = copyData;
            NotifyPropertyChanged("");
        }

        public virtual void EndEdit()
        {
            copyData = new ItemData();
        }

        #endregion

    }

    public class MusicCD : LibraryItem
    {
        private struct MusicData
        {
            internal int SongNumber;
            internal string Artist;
        }

        MusicData copyData;
        MusicData currentData;

        public MusicCD(string title, string artist, int songNum, string callNum, DateTime dueDate)
            : base(title, callNum, dueDate)
        {
            currentData.SongNumber = songNum;
            currentData.Artist = artist;
        }

        public string Artist
        {
            get { return currentData.Artist; }
            set
            {
                if (value != currentData.Artist)
                {
                    currentData.Artist = value;
                    NotifyPropertyChanged("Artist");
                }
            }
        }

        public int NumberOfTracks
        {
            get { return currentData.SongNumber; }
            set
            {
                if (value != currentData.SongNumber)
                {
                    currentData.SongNumber = value;
                    NotifyPropertyChanged("NumberOfTracks");
                }
            }
        }

        public override void BeginEdit()
        {
            base.BeginEdit();
            copyData = currentData;
        }

        public override void CancelEdit()
        {
            base.CancelEdit();
            currentData = copyData;
        }

        public override void EndEdit()
        {
            base.EndEdit();
            copyData = new MusicData();
        }

        public override string ToString()
        {
            return string.Format(
                "Album: {0}\nArtist: {1}\nTracks: {2}\nDue Date: {3:d}\nCall Number: {4}",
                this.Title, this.Artist, this.NumberOfTracks, this.DueDate, this.CallNumber);
        }
    }

    public class Book : LibraryItem
    {
        private struct BookData
        {
            internal string Author;
            internal string Genre;
        }

        BookData currentData;
        BookData copyData;

        public Book(string title, string author, string genre, string callnum, DateTime dueDate)
            : base (title, callnum, dueDate)
        {
            this.Author = author;
            this.Genre = genre;
        }

        public string Author
        {
            get { return currentData.Author; }
            set
            {
                if (value != currentData.Author)
                {
                    currentData.Author = value;
                    NotifyPropertyChanged("Author");
                }
            }
        }

        public string Genre
        {
            get { return currentData.Genre; }
            set
            {
                if (value != currentData.Genre)
                {
                    currentData.Genre = value;
                    NotifyPropertyChanged("Genre");
                }
            }
        }

        public override void BeginEdit()
        {
            base.BeginEdit();
            copyData = currentData;
        }

        public override void CancelEdit()
        {
            base.CancelEdit();
            currentData = copyData;
        }

        public override void EndEdit()
        {
            base.EndEdit();
            copyData = new BookData();
        }

        public override string ToString()
        {
            return String.Format(
                "Title: {0}\nAuthor: {1}\nGenre: {2}\nDue Date: {3:d}\nCall Number: {4}",
                this.Title, this.Author, this.Genre, this.DueDate, this.CallNumber);
        }
    }

    public class MovieDVD : LibraryItem
    {
        private struct MovieData
        {
            internal TimeSpan Length;
            internal string Director;
            internal string Genre;
        }

        private MovieData currentData;
        private MovieData copyData;

        public MovieDVD(string title, string director, string genre, TimeSpan length, string callnum, DateTime dueDate)
            : base(title, callnum, dueDate)
        {
            this.Director = director;
            this.Length = length;
            this.Genre = genre;
        }

        public TimeSpan Length
        {
            get { return currentData.Length; }
            set
            {
                if (value != currentData.Length)
                {
                    currentData.Length = value;
                    NotifyPropertyChanged("Length");
                }
            }
        }

        public string Director
        {
            get { return currentData.Director; }
            set
            {
                if (value != currentData.Director)
                {
                    currentData.Director = value;
                    NotifyPropertyChanged("Director");
                }
            }
        }

        public string Genre
        {
            get { return currentData.Genre; }
            set
            {
                if (value != currentData.Genre)
                {
                    currentData.Genre = value;
                    NotifyPropertyChanged("Genre");
                }
            }
        }

        public override void BeginEdit()
        {
            base.BeginEdit();
            copyData = currentData;
        }

        public override void CancelEdit()
        {
            base.CancelEdit();
            currentData = copyData;
        }

        public override void EndEdit()
        {
            base.EndEdit();
            copyData = new MovieData();
        }

        public override string  ToString()
        {
            return String.Format("Title: {0}\nDirector: {1}\nGenre: {2}\nLength: {3}\nDue Date: {4:d}\nCall Number: {5}",
                this.Title, this.Director, this.Genre, this.Length, this.DueDate, this.CallNumber);
        }
    }

    public class LibraryCatalog : ObservableCollection<LibraryItem>
    {
        public LibraryCatalog()
        {
            Add(new MusicCD("A Programmers Plight", "Jon Orton", 
                12, "CD.OrtPro", new DateTime(2010, 3, 24)));
    
            Add(new Book("Cooking with Thyme", "Eliot J. Graff",
                "Home Economics", "HE.GraThy", new DateTime(2010, 2, 26)));
            
            Add(new MovieDVD("Terror of the Testers", "Molly Dempsey", 
                "Horror", new TimeSpan(1, 27, 19), "DVD.DemTer",
                new DateTime(2010, 2, 1)));
            
            Add(new MusicCD("The Best of Jim Hance", "Jim Hance", 
                15, "CD.HanBes", new DateTime(2010, 1, 31)));
            
            Add(new Book("Victor and the VB Vehicle", "Tommy Hortono", 
                "YA Fiction", "YA.HorVic", new DateTime(2010, 3, 1)));
        }
    }
}
Imports System.Collections.ObjectModel
Imports System.ComponentModel

' LibraryItem implements INotifyPropertyChanged so that the 
' application is notified when a property changes. It 
' implements IEditableObject so that pending changes can be discarded. 
Public Class LibraryItem
    Implements INotifyPropertyChanged
    Implements IEditableObject
    Private Structure ItemData
        Friend Title As String
        Friend CallNumber As String
        Friend DueDate As DateTime
    End Structure

    Private copyData As ItemData
    Private currentData As ItemData

    Public Sub New(ByVal title As String, ByVal callNum As String, ByVal dueDate As DateTime)
        Me.Title = title
        Me.CallNumber = callNum
        Me.DueDate = dueDate
    End Sub

    Public Property Title() As String
        Get
            Return currentData.Title
        End Get
        Set(ByVal value As String)
            If currentData.Title <> value Then
                currentData.Title = value
                NotifyPropertyChanged("Title")
            End If
        End Set
    End Property

    Public Property CallNumber() As String
        Get
            Return currentData.CallNumber
        End Get
        Set(ByVal value As String)
            If currentData.CallNumber <> value Then
                currentData.CallNumber = value
                NotifyPropertyChanged("CallNumber")
            End If
        End Set
    End Property

    Public Property DueDate() As DateTime
        Get
            Return currentData.DueDate
        End Get
        Set(ByVal value As DateTime)
            If value <> currentData.DueDate Then
                currentData.DueDate = value
                NotifyPropertyChanged("DueDate")
            End If
        End Set
    End Property

#Region "INotifyPropertyChanged Members"

    Public Event PropertyChanged As PropertyChangedEventHandler _
        Implements INotifyPropertyChanged.PropertyChanged

    Protected Sub NotifyPropertyChanged(ByVal info As String)
        RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(info))
    End Sub

#End Region

#Region "IEditableObject Members"

    Public Overridable Sub BeginEdit() Implements IEditableObject.BeginEdit
        copyData = currentData
    End Sub

    Public Overridable Sub CancelEdit() Implements IEditableObject.CancelEdit
        currentData = copyData

        NotifyPropertyChanged("")
    End Sub

    Public Overridable Sub EndEdit() Implements IEditableObject.EndEdit

        copyData = New ItemData()
    End Sub

#End Region

End Class


Public Class MusicCD
    Inherits LibraryItem
    Private Structure MusicData
        Friend SongNumber As Integer
        Friend Artist As String

    End Structure

    Private copyData As MusicData
    Private currentData As MusicData

    Public Sub New(ByVal title As String, ByVal artist As String,
                   ByVal songNum As Integer, ByVal callNum As String,
                   ByVal dueDate As DateTime)

        MyBase.New(title, callNum, dueDate)
        currentData.SongNumber = songNum
        currentData.Artist = artist
    End Sub

    Public Property Artist() As String
        Get
            Return currentData.Artist
        End Get
        Set(ByVal value As String)
            If value <> currentData.Artist Then
                currentData.Artist = value
                NotifyPropertyChanged("Artist")
            End If
        End Set
    End Property

    Public Property NumberOfTracks() As Integer
        Get
            Return currentData.SongNumber
        End Get
        Set(ByVal value As Integer)
            If value <> currentData.SongNumber Then
                currentData.SongNumber = value
                NotifyPropertyChanged("NumberOfTracks")
            End If
        End Set
    End Property

    Public Overloads Overrides Sub BeginEdit()
        MyBase.BeginEdit()
        copyData = currentData
    End Sub

    Public Overloads Overrides Sub CancelEdit()
        MyBase.CancelEdit()
        currentData = copyData
    End Sub

    Public Overloads Overrides Sub EndEdit()
        MyBase.EndEdit()
        copyData = New MusicData()
    End Sub

End Class

Public Class Book
    Inherits LibraryItem
    Private Structure BookData
        Friend Author As String
        Friend Genre As String
    End Structure

    Private currentData As BookData
    Private copyData As BookData

    Public Sub New(ByVal title As String, ByVal author As String, 
                   ByVal genre As String, ByVal callnum As String, 
                   ByVal dueDate As DateTime)
        MyBase.New(title, callnum, dueDate)

        Me.Author = author
        Me.Genre = genre
    End Sub

    Public Property Author() As String
        Get
            Return currentData.Author
        End Get
        Set(ByVal value As String)
            If value <> currentData.Author Then
                currentData.Author = value
                NotifyPropertyChanged("Author")
            End If
        End Set
    End Property

    Public Property Genre() As String
        Get
            Return currentData.Genre
        End Get
        Set(ByVal value As String)
            If value <> currentData.Genre Then
                currentData.Genre = value
                NotifyPropertyChanged("Genre")
            End If
        End Set
    End Property

    Public Overloads Overrides Sub BeginEdit()
        MyBase.BeginEdit()
        copyData = currentData
    End Sub

    Public Overloads Overrides Sub CancelEdit()
        MyBase.CancelEdit()
        currentData = copyData
    End Sub

    Public Overloads Overrides Sub EndEdit()
        MyBase.EndEdit()
        copyData = New BookData()
    End Sub

End Class

Public Class MovieDVD
    Inherits LibraryItem
    Private Structure MovieData
        Friend Length As TimeSpan
        Friend Director As String
        Friend Genre As String
    End Structure

    Private currentData As MovieData
    Private copyData As MovieData


    Public Sub New(ByVal title As String, ByVal director As String,
                   ByVal genre As String, ByVal length As TimeSpan,
                   ByVal callnum As String, ByVal dueDate As DateTime)

        MyBase.New(title, callnum, dueDate)
        Me.Director = director
        Me.Length = length
        Me.Genre = genre
    End Sub

    Public Property Length() As TimeSpan
        Get
            Return currentData.Length
        End Get
        Set(ByVal value As TimeSpan)
            If value <> currentData.Length Then
                currentData.Length = value
                NotifyPropertyChanged("Length")
            End If
        End Set
    End Property

    Public Property Director() As String
        Get
            Return currentData.Director
        End Get
        Set(ByVal value As String)
            If value <> currentData.Director Then
                currentData.Director = value
                NotifyPropertyChanged("Director")
            End If
        End Set
    End Property

    Public Property Genre() As String
        Get
            Return currentData.Genre
        End Get
        Set(ByVal value As String)
            If value <> currentData.Genre Then
                currentData.Genre = value
                NotifyPropertyChanged("Genre")
            End If
        End Set
    End Property

    Public Overloads Overrides Sub BeginEdit()
        MyBase.BeginEdit()
        copyData = currentData
    End Sub

    Public Overloads Overrides Sub CancelEdit()
        MyBase.CancelEdit()
        currentData = copyData
    End Sub

    Public Overloads Overrides Sub EndEdit()
        MyBase.EndEdit()
        copyData = New MovieData()
    End Sub

End Class

Public Class LibraryCatalog
    Inherits ObservableCollection(Of LibraryItem)

    Public Sub New()
        Add(New MusicCD("A Programmers Plight", "Jon Orton", 12,
                        "CD.OrtPro", New DateTime(2010, 3, 24)))
        Add(New Book("Cooking with Thyme", "Eliot J. Graff",
                        "Home Economics", "HE.GraThy", New DateTime(2010, 2, 26)))
        Add(New MovieDVD("Terror of the Testers", "Molly Dempsey", "Horror",
                         New TimeSpan(1, 27, 19), "DVD.DemTer", New DateTime(2010, 2, 1)))
        Add(New MusicCD("The Best of Jim Hance", "Jim Hance", 15,
                        "CD.HanBes", New DateTime(2010, 1, 31)))
        Add(New Book("Victor and the VB Vehicle", "Tommy Hortono",
                        "YA Fiction", "YA.HorVic", New DateTime(2010, 3, 1)))
    End Sub
End Class

注解

使用IEditableCollectionViewAddNewItem接口, 应用程序开发人员可以指定要添加到集合的对象的类型。The IEditableCollectionViewAddNewItem interface enables application developers to specify what type of object to add to a collection. 此接口扩展IEditableCollectionView了, 因此你可以在集合中添加、编辑和删除项。This interface extends IEditableCollectionView, so you can add, edit, and remove items in a collection. IEditableCollectionViewAddNewItemAddNewItem添加方法, 该方法采用添加到集合中的对象。IEditableCollectionViewAddNewItem adds the AddNewItem method, which takes an object that is added to the collection. 如果要添加的集合和对象具有以下一个或多个特性, 则此方法很有用:This method is useful when the collection and objects that you want to add have one or more of the following characteristics:

  • 中的对象是CollectionView不同的类型。The objects in the CollectionView are different types.

  • 对象没有无参数的构造函数。The objects do not have a parameterless constructor.

  • 该对象已经存在。The object already exists.

  • 需要将null对象添加到集合中。You want to add a null object to the collection.

属性

CanAddNew

获取一个值,该值指示是否可以将新项添加到集合中。Gets a value that indicates whether a new item can be added to the collection.

(继承自 IEditableCollectionView)
CanAddNewItem

获取一个值,该值指示是否可以向集合中添加指定的对象。Gets a value that indicates whether a specified object can be added to the collection.

CanCancelEdit

获取一个值,该值指示集合视图是否可以放弃挂起的更改并还原所编辑对象的原始值。Gets a value that indicates whether the collection view can discard pending changes and restore the original values of an edited object.

(继承自 IEditableCollectionView)
CanRemove

获取一个值,该值指示是否可以从集合中移除项。Gets a value that indicates whether an item can be removed from the collection.

(继承自 IEditableCollectionView)
CurrentAddItem

获取正在当前添加事务过程中添加的项。Gets the item that is being added during the current add transaction.

(继承自 IEditableCollectionView)
CurrentEditItem

获取集合中正在编辑的项。Gets the item in the collection that is being edited.

(继承自 IEditableCollectionView)
IsAddingNew

获取一个值,该值指示是否正在执行添加事务。Gets a value that indicates whether an add transaction is in progress.

(继承自 IEditableCollectionView)
IsEditingItem

获取一个值,该值指示是否正在执行编辑事务。Gets a value that indicates whether an edit transaction is in progress.

(继承自 IEditableCollectionView)
NewItemPlaceholderPosition

获取或设置集合视图中新项占位符的位置。Gets or sets the position of the new item placeholder in the collection view.

(继承自 IEditableCollectionView)

方法

AddNew()

将新项添加到集合中。Adds a new item to the collection.

(继承自 IEditableCollectionView)
AddNewItem(Object)

将指定的对象添加到集合。Adds the specified object to the collection.

CancelEdit()

结束编辑事务,并还原项的原始值(如有可能)。Ends the edit transaction and, if possible, restores the original value to the item.

(继承自 IEditableCollectionView)
CancelNew()

结束添加事务并放弃挂起的新项。Ends the add transaction and discards the pending new item.

(继承自 IEditableCollectionView)
CommitEdit()

结束编辑事务并保存挂起的更改。Ends the edit transaction and saves the pending changes.

(继承自 IEditableCollectionView)
CommitNew()

结束添加事务并保存挂起的新项。Ends the add transaction and saves the pending new item.

(继承自 IEditableCollectionView)
EditItem(Object)

开始指定项的编辑事务。Begins an edit transaction of the specified item.

(继承自 IEditableCollectionView)
Remove(Object)

从集合中移除指定的项。Removes the specified item from the collection.

(继承自 IEditableCollectionView)
RemoveAt(Int32)

从集合中移除指定位置的项。Removes the item at the specified position from the collection.

(继承自 IEditableCollectionView)

适用于