CollectionView与扩展器没有找到属性，虽然工作在扩展器头

我正在做一个c# WPF项目，我正在尝试使用CollectionView将元素分组在一起。

数据通过存储在数组中的XML消息读取。

下面是我用来处理数组的代码:

public void processCallLogInfo(string xml)
        {
            List<CallLogInformation> callLogInformationList = new List<CallLogInformation>();
            string phoneNumber = null;
            string contactName = null;
            string contactPhoto = null;
            XDocument doc = XDocument.Parse(xml);
            var callLogInformationRoot = doc.Descendants("CallLogInformation");
            foreach (var callLogInformation in callLogInformationRoot)
            {
                var callLogRoot = callLogInformation.Descendants("CallLog");
                foreach (var log in callLogRoot)
                {
                    var logRoot = log.Descendants("LogInformation");
                    foreach (var info in logRoot)
                    {
                        CallLogInformation callLogInfo = new CallLogInformation();
                        callLogInfo.contactInformation = new ContactInformation();
                        phoneNumber = info.Element("PhoneNumber").Value;
                        if (info.Elements("ContactPhoto").Any())
                        {
                            callLogInfo.contactInformation.photoBase64String = info.Element("ContactPhoto").Value;
                        }
                        if (info.Elements("ContactName").Any())
                        {
                            callLogInfo.contactInformation.contactName = info.Element("ContactName").Value;
                            callLogInfo.contactNameOrPhoneNumber = info.Element("ContactName").Value;
                        }
                        else
                        {
                            callLogInfo.contactNameOrPhoneNumber = phoneNumber;
                        }
                        callLogInfo.callType = info.Element("CallType").Value;
                        callLogInfo.date = long.Parse(info.Element("Date").Value);
                        callLogInfo.callDuration = Int32.Parse(info.Element("Duration").Value);
                        callLogInfo.contactInformation.phoneNumber = phoneNumber;
                        callLogInformationList.Add(callLogInfo);
                        //iCallLogManager.addCallLogItemToGUI(callLogInfo);
                    }
                }
            }
            iCallLogManager.addArrayToGui(callLogInformationList);
        }

下面是CallLogInformation类

public class CallLogInformation
    {
        public enum CallType { INCOMING, OUTGOING, MISSED, UNKNOWN };
        public string contactNameOrPhoneNumber { get; set; }
        public ContactInformation contactInformation {get; set;}
        //public CallType callType { get; set; }
        public string callType { get; set; }
        public long date { get; set; }
        public int callDuration { get; set; }
        public CallLogInformation()
        {
            //callType = CallType.UNKNOWN;
        }
    }

下面是如何将数组添加到集合视图

public void addArrayToGui(List<CallLogInformation> callLogInformationList)
        {
            this.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Background, new System.Windows.Threading.DispatcherOperationCallback(delegate
                {
                    ICollectionView callLogView = CollectionViewSource.GetDefaultView(callLogInformationList);
                    callLogView.GroupDescriptions.Add(new PropertyGroupDescription("callType"));
                    lstCallLogInformation.ItemsSource = callLogView;
                    return null;
                }), null);
        }

我正在尝试按callType属性分组，因此呼叫分组为传入/传出/未接

当我把扩展器部分的代码在它说，它找不到属性callType，但如果我删除扩展器，只是添加callType到列表组没有扩展器它的工作，所以callType绝对是工作的，所以我不明白为什么当扩展器使用它有一个问题。

下面是WPF XAML

<ListView Height="397" HorizontalAlignment="Left" Margin="491,29,0,0" Name="lstCallLogInformation" 
                 VerticalAlignment="Top" Width="320">
            <ListView.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate>
                                        <Expander IsExpanded="True">
                                            <Expander.Header>
                                                <StackPanel Orientation="Horizontal">
                                                    <TextBlock Text="{Binding callType}" FontWeight="Bold" Foreground="Gray" VerticalAlignment="Bottom" />
                                                </StackPanel>
                                            </Expander.Header>
                                        </Expander>
                                    </ControlTemplate>
                                </Setter.Value>
                            </Setter>
                        </Style>
                    </GroupStyle.ContainerStyle>
                </GroupStyle>
                <GroupStyle />
            </ListView.GroupStyle>
            <ListView.ItemTemplate>
                <DataTemplate>
                    <DockPanel>
                        <TextBlock Text="{Binding contactNameOrPhoneNumber}" FontWeight="Bold" />
                        <TextBlock Text="{Binding callType}" />
                    </DockPanel>
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>