IEditableCollectionViewAddNewItem 介面

定義

命名空間:: System.ComponentModel

組件:: WindowsBase.dll

重要

部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。

定義 a CollectionView 實作的方法與屬性，以使得能夠指定新增特定類型的項目。

public interface class IEditableCollectionViewAddNewItem : System::ComponentModel::IEditableCollectionView

public interface IEditableCollectionViewAddNewItem : System.ComponentModel.IEditableCollectionView

type IEditableCollectionViewAddNewItem = interface
    interface IEditableCollectionView

Public Interface IEditableCollectionViewAddNewItem
Implements IEditableCollectionView

衍生: System.Windows.Controls.ItemCollection

System.Windows.Data.ListCollectionView

實作: IEditableCollectionView

範例

以下範例讓使用者能夠將各種類型的項目加入收藏。使用者可以輸入新項目並提交輸入或取消交易。範例中 Items a 的屬性ListBox取得，IEditableCollectionViewAddNewItem並建立一個物件，其型別由使用者決定。接著範例會呼叫 AddNewItem 該方法，將物件加入集合。

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

namespace IEditableCollectionViewAddItemExample;

public partial class Window1 : Window
{
    public Window1() => InitializeComponent();

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

        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();

        // Create an item, depending on which RadioButton is selected.
        // Radio buttons correspond to book, cd, dvd, or other.
        LibraryItem newItem = (bool)book.IsChecked
            ? new Book("Enter the book title", "Enter an Author", "Enter a Genre",
                "Enter a call number", DateTime.Now + new TimeSpan(21, 0, 0, 0))
            : (bool)cd.IsChecked
                ? new MusicCD("Enter the Album", "Enter the artist", 0, "CD.******",
                            DateTime.Now + new TimeSpan(14, 0, 0, 0))
                : (bool)dvd.IsChecked
                            ? new MovieDVD("Enter the movie title", "Enter the director",
                                        "Enter the genre", new TimeSpan(), "DVD.******",
                                        DateTime.Now + new TimeSpan(7, 0, 0, 0))
                            : 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

以下範例為前述範例建立使用者介面。

<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>

以下範例建立使用者為新項目新增資料的。AddItemWindow

<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>

以下範例展示了的 AddItemWindow邏輯。

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

namespace IEditableCollectionViewAddItemExample;

public partial class AddItemWindow : Window
{
    public AddItemWindow() => InitializeComponent();

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

    // Select all text when the TextBox gets focus.
    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

以下範例展示了前述範例中使用的資料型態與集合。

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() => string.Format("{0}, {1:c}, {2:D}", Title, CallNumber, DueDate);

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

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

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

    #region INotifyPropertyChanged Members

    public event PropertyChangedEventHandler PropertyChanged;

    protected void NotifyPropertyChanged(string info) => PropertyChanged?.Invoke(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
{
    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 => currentData.Artist;
        set
        {
            if (value != currentData.Artist)
            {
                currentData.Artist = value;
                NotifyPropertyChanged("Artist");
            }
        }
    }

    public int NumberOfTracks
    {
        get => 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() => string.Format(
            "Album: {0}\nArtist: {1}\nTracks: {2}\nDue Date: {3:d}\nCall Number: {4}",
            Title, Artist, NumberOfTracks, DueDate, CallNumber);
}

public class Book : LibraryItem
{
    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)
    {
        Author = author;
        Genre = genre;
    }

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

    public string Genre
    {
        get => 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() => string.Format(
            "Title: {0}\nAuthor: {1}\nGenre: {2}\nDue Date: {3:d}\nCall Number: {4}",
            Title, Author, Genre, DueDate, CallNumber);
}

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

    MovieData currentData;
    MovieData copyData;

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

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

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

    public string Genre
    {
        get => 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() => string.Format("Title: {0}\nDirector: {1}\nGenre: {2}\nLength: {3}\nDue Date: {4:d}\nCall Number: {5}",
            Title, Director, Genre, Length, DueDate, 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

備註

介面允許 IEditableCollectionViewAddNewItem 應用程式開發者指定要加入集合的物件類型。此介面延伸 IEditableCollectionView至，因此你可以新增、編輯或移除收藏中的項目。 IEditableCollectionViewAddNewItem 新增 AddNewItem 了方法，該方法取一個被加入集合的物件。當你想加入的集合和物件具有以下一項或多項特徵時，此方法非常有用：

裡面的 CollectionView 物件有不同類型。
這些物件沒有無參數建構子。
這個物件已經存在了。
你想把 null 一個物件加入集合。

屬性

名稱	Description
CanAddNew	會獲得一個值，表示是否可以新增一個項目到收藏中。 (繼承來源 IEditableCollectionView)
CanAddNewItem	會取得一個值，指示是否可以將指定物件加入集合中。
CanCancelEdit	會取得一個值，表示集合檢視是否能捨棄待處理的變更並還原已編輯物件的原始值。 (繼承來源 IEditableCollectionView)
CanRemove	會獲得一個值，指示某項目是否可以從收藏中移除。 (繼承來源 IEditableCollectionView)
CurrentAddItem	取得目前新增交易中新增的項目。 (繼承來源 IEditableCollectionView)
CurrentEditItem	取得正在編輯的集合中項目。 (繼承來源 IEditableCollectionView)
IsAddingNew	會得到一個值，表示是否正在進行新增交易。 (繼承來源 IEditableCollectionView)
IsEditingItem	會得到一個值，表示編輯交易是否正在進行中。 (繼承來源 IEditableCollectionView)
NewItemPlaceholderPosition	取得或設定新項目在集合檢視中的位置。 (繼承來源 IEditableCollectionView)

方法

名稱	Description
AddNew()	新增一個物品到收藏中。 (繼承來源 IEditableCollectionView)
AddNewItem(Object)	將指定的物件加入集合中。
CancelEdit()	結束編輯交易，並在可能的情況下還原該項目的原始值。 (繼承來源 IEditableCollectionView)
CancelNew()	結束新增交易並丟棄待處理的新項目。 (繼承來源 IEditableCollectionView)
CommitEdit()	結束編輯交易並儲存待處理的變更。 (繼承來源 IEditableCollectionView)
CommitNew()	結束新增交易並儲存待處理的新項目。 (繼承來源 IEditableCollectionView)
EditItem(Object)	開始對指定項目進行編輯交易。 (繼承來源 IEditableCollectionView)
Remove(Object)	從集合中移除指定的項目。 (繼承來源 IEditableCollectionView)
RemoveAt(Int32)	將指定位置的項目從集合中移除。 (繼承來源 IEditableCollectionView)

適用於

意見反應

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共用方式為

IEditableCollectionViewAddNewItem 介面

定義

範例

備註

屬性

方法

適用於

意見反應