「值不在預期範圍」列表集合，而不是在觀察集合

Question

這是我工作的代碼，

private ObservableCollection<User> _Users; 
public ObservableCollection<User> Users 
{ 
    get { return _Users; } 
    set { _Users = value; RaisePropertyChanged(()=> Users); } 
} 

Users = new ObservableCollection<User>(); 
for (int i = 1; i <= 10; i++) 
{ 
    Users.Add(new User() 
    { 
     ADDRESS_LINE_1 = "Test Address", 
     ADDRESS_LINE_2 = "Test Address 2", 
     FIRST_NAME = "Test Name " + i, 
     SURNAME = "Test surname " +i, 
     DATE_OF_BIRTH = DateTime.Now.Date, 
     GENDER = "M", 
     MOBILE_PHONE_NUMBER = "+1100000", 
     EMAIL_ADDRESS = "Test@email.com", 
     LAST_MODIFIED = DateTime.Now, 
     LOGIN_NAME ="operator.domain.com", 
     ItemIndex = Users.Count +1 

    }); 
} 

早些時候我使用

private List<User> _Users; 
public List<User> Users 
{ 
    get { return _Users; } 
    set { _Users = value; RaisePropertyChanged(()=> Users); } 
} 

Users = new List<User>(); 
for (int i = 1; i <= 10; i++) 
{ 
    Users.Add(new User() 
    { 
     ADDRESS_LINE_1 = "Test Address", 
     ADDRESS_LINE_2 = "Test Address 2", 
     FIRST_NAME = "Test Name " + i, 
     SURNAME = "Test surname " +i, 
     DATE_OF_BIRTH = DateTime.Now.Date, 
     GENDER = "M", 
     MOBILE_PHONE_NUMBER = "+9100000", 
     EMAIL_ADDRESS = "Test@email.com", 
     LAST_MODIFIED = DateTime.Now, 
     LOGIN_NAME ="operator1.domain.com", 
     ItemIndex = Users.Count +1 
    }); 
} 

，我不斷收到以下異常消息，當我嘗試將它與xaml中的數據模板綁定時

Value does not fall within the expected range. 

堆棧跟蹤爲空:(

另外，如果我把另一個數組變量，並將這些值添加到它，然後分配該列表到我上面所列內容的淺表副本，代碼給我想要的結果，但同樣究竟繞來繞去。

這是DataTemplate中

<DataTemplate> 
      <Grid Margin="-8,-10,-8,-10" Background="{Binding ItemIndex, Converter={StaticResource AlternateRowBackgroundConverter}}"> 
       <Grid.ColumnDefinitions> 
        <ColumnDefinition Width="*"></ColumnDefinition> 
        <ColumnDefinition Width="*"></ColumnDefinition> 
        <ColumnDefinition Width="*"></ColumnDefinition> 
        <ColumnDefinition Width="*"></ColumnDefinition> 
        <ColumnDefinition Width="*"></ColumnDefinition> 
        <ColumnDefinition Width="*"></ColumnDefinition> 
       </Grid.ColumnDefinitions> 
       <Border Grid.Column="0" Style="{StaticResource BorderStyleForAdmin}" Background="{Binding ItemIndex, Converter={StaticResource AlternateRowBackgroundConverter}}"> 
        <StackPanel Orientation="Horizontal"> 
         <!--<Border BorderBrush="Gray" BorderThickness="0.3" Visibility="{Binding IsSelectedItem, Mode=TwoWay, Converter={StaticResource ControlVisibiltyOfSelectedItemInListBox}}"> 
          <TextBlock Text="{StaticResource ArrowGlyph}" Foreground="Black" VerticalAlignment="Center" HorizontalAlignment="Right"></TextBlock> 
         </Border>--> 
         <TextBlock Style="{StaticResource TextBlockCell}" Text="{Binding SURNAME}"></TextBlock> 
        </StackPanel> 
       </Border> 
       <Border Grid.Column="1" Style="{StaticResource BorderStyleForAdmin}" Background="{Binding ItemIndex, Converter={StaticResource AlternateRowBackgroundConverter}}"> 
        <TextBlock Style="{StaticResource TextBlockCell}" Text="{Binding FIRST_NAME}"></TextBlock> 
       </Border> 
       <Border Grid.Column="2" Style="{StaticResource BorderStyleForAdmin}" Background="{Binding ItemIndex, Converter={StaticResource AlternateRowBackgroundConverter}}"> 
        <TextBlock Style="{StaticResource TextBlockCell}" HorizontalAlignment="Stretch"> 
         <Run Text="{Binding ADDRESS_LINE_1}"></Run><LineBreak></LineBreak> 
         <Run Text="{Binding ADDRESS_LINE_2}"></Run> 
        </TextBlock> 
       </Border> 
       <Border Grid.Column="3" Style="{StaticResource BorderStyleForAdmin}" Background="{Binding ItemIndex, Converter={StaticResource AlternateRowBackgroundConverter}}"> 
        <TextBlock Style="{StaticResource TextBlockCell}" Text="{Binding DATE_OF_BIRTH}"></TextBlock> 
       </Border> 
       <Border Grid.Column="4" Style="{StaticResource BorderStyleForAdmin}" Background="{Binding ItemIndex, Converter={StaticResource AlternateRowBackgroundConverter}}"> 
        <TextBlock Style="{StaticResource TextBlockCell}" Text="{Binding EMAIL_ADDRESS}"></TextBlock> 
       </Border> 
       <Border Grid.Column="5" Style="{StaticResource BorderStyleForAdmin}" Background="{Binding ItemIndex, Converter={StaticResource AlternateRowBackgroundConverter}}"> 
        <TextBlock Style="{StaticResource TextBlockCell}" Text="{Binding MOBILE_PHONE_NUMBER}"></TextBlock> 
       </Border> 
      </Grid> 
     </DataTemplate> 

雖然，觀察到的集合爲我工作，但我很奇怪，爲什麼清單給我這個例外，我無法找出什麼是幕後的實際原因。提前致謝。

Answer 1

唯一讓我感到困惑的是「RaisePropertyChanged」與ObservableCollection一起使用或至少您必須繼承INotifyPropertyChanged接口。在你的第二個實現列表中沒有得到「RaisePropertyChanged」方法。考慮列表聲明爲：

private List<User> _Users; 
public List<User> Users 
{ 
    get { return _Users; } 
    set { _Users = value;} 
} 

我認爲這應該可以解決錯誤。但注意，這樣做不會提高PropertyChanged事件每當要通知底層集合或容器的狀態已經改變物體的變化（添加，刪除，修改和）到點的狀態。

欲瞭解更多信息：List vs ObservableCollection vs INotifyPropertyChanged in Silverlight