"；值没有落在期望的范围内”；列出集合，但不在Observable集合中

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
    });
}

当我尝试将其与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，如果我取另一个列表变量并将这些值添加到其中，然后将该列表的浅副本分配给上面的列表，代码会给出我想要的结果，但同样会给出实际情况。

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系列对我来说很有效，但我想知道为什么List会给我这个例外，我无法弄清楚幕后的实际原因是什么。提前谢谢。

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