1

这是我的工作代码，

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

    });
}

早些时候我正在使用

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
    });
}

当我尝试将它与 xaml 中的数据模板绑定时，我不断收到以下异常消息

Value does not fall within the expected range.

堆栈跟踪为空:(

此外，如果我获取另一个列表变量并将这些值添加到它，然后将该列表的浅表副本分配给我上面的列表，代码会给我想要的结果，但实际上又是什么。

这是数据模板

<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>

虽然，Observable 集合对我有用，但我想知道为什么 List 给我这个例外，我无法弄清楚幕后的实际原因是什么。提前致谢。

4

1 回答 1

1

唯一让我烦恼的是“ RaisePropertyChanged”与ObservableCollection或至少您必须继承INotifyPropertyChanged接口一起使用。在您的第二个实现列表中没有获得“RaisePropertyChanged”方法。将列表声明视为：

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

我认为这应该可以解决错误。但请注意，只要对象的状态（已添加、已删除和已修改）更改到您想要通知基础集合或容器状态已更改的程度，这样做不会引发 PropertyChanged 事件。

有关更多信息，请阅读：Silverlight 中的 List vs ObservableCollection vs INotifyPropertyChanged

于 2013-08-23T12:36:13.247 回答