WPF；根据组合框项更改日志级别

所以我有了这个

日志

集合：

public static ObservableCollection<Log> Logs{ get; } = new ObservableCollection<Log>();

public class Log : INotifyPropertyChanged
    {
        public Log(Level level, string msg)
        {
            Timestamp = DateTime.Now.ToString("dd/MM/yy HH:mm:ss");
            Level = level;
            Message = msg;
        }        

        public event PropertyChangedEventHandler PropertyChanged;

        private Level level;
        public Level Level
        {
            get { return level; }
            set
            {
                level = value;
                NotifyPropertyChanged("Level");
            }
        }

        private void NotifyPropertyChanged([CallerMemberName] String propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

public enum Level
    {
        DEBUG,
        ERROR,
        FAIL,
        INFO,
        WARN
    }

组合框命令

public void Execute(object parameter)
        {
            ComboBox comboBox = parameter as ComboBox;
            if (comboBox != null)
            {
                var comboBoxItem = comboBox.SelectedItem as ComboBoxItem;
                if (comboBoxItem != null)
                {
                    Level level = (Level)Enum.Parse(typeof(Level), comboBoxItem.Content.ToString(), true);
                    LogService.Level = level;
                }
            }
        }

因此，当用户更改此

级别

时，我希望我的

列表视图

仅显示相关的

级别

。 我还创建了

转换器

：

public class LogLevelVisibilityConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (LogService.Level == (Level)value)
                return true;
            return false;
        }
    }

并将其命名为my

ListViewItem

style

：

<DataTrigger Binding="{Binding Level, Converter={StaticResource LogLevelVisibilityConverter}}" Value="False">
      <Setter Property="Visibility" Value="Collapsed"/>
 </DataTrigger>

因此，当用户将此

ComboBOxItem

更改为例如

DEBUG

时，我只能在

DEBUG

模式下看到所有新消息，但所有旧消息仍然可见，我只想看到所选

级别的消息

<DataTrigger Binding="{Binding Level, Converter={StaticResource LogLevelVisibilityConverter}}" Value="False">
      <Setter Property="Visibility" Value="Collapsed"/>
 </DataTrigger>