使用WPF实现日志查看器

时间:2013-05-24 21:19:37

标签: c# wpf performance user-interface scroll

我寻求有关使用WPF实现控制台日志查看器的最佳方法的建议。

它应符合以下标准:

  • 快速滚动100.000+行
  • 某些条目(如stacktraces)应该是可折叠的
  • 长项包装
  • 可以按不同标准(搜索,标签等)过滤列表
  • 在最后,它应该在添加新项目时继续滚动
  • 线元素可以包含某种添加格式,如超链接和出现计数器

总的来说,我有一些想法,比如FireBug和Chrome的控制台窗口。

我和this一起玩,但我没有取得多大进展,因为...... - 数据网格无法处理不同的项目高度 - 滚动位置仅在释放滚动条后更新(这是完全不可接受的)。

我很确定,我需要某种形式的虚拟化,并希望遵循MVVM模式。

欢迎任何帮助或指示。

2 个答案:

答案 0 :(得分:172)

我应该开始销售这些WPF样本,而不是免费赠送。 = P

enter image description here

  • 虚拟化UI(使用VirtualizingStackPanel),提供令人难以置信的良好性能(即使有200000多个项目)
  • 完全对MVVM友好。
  • DataTemplate针对每种LogEntry类型。这些使您能够自定义为 你想要的很多。我只实现了2种LogEntries(基本和嵌套),但你明白了。您可以根据需要继承LogEntry。您甚至可以支持富文本或图像。
  • 可扩展(嵌套)项目。
  • Word Wrap。
  • 您可以使用CollectionView
  • 实施过滤等
  • WPF Rocks,只需将我的代码复制并粘贴到File -> New -> WPF Application中,然后自行查看结果。

    <Window x:Class="MiscSamples.LogViewer"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:MiscSamples"
        Title="LogViewer" Height="500" Width="800">
    <Window.Resources>
        <Style TargetType="ItemsControl" x:Key="LogViewerStyle">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <ScrollViewer CanContentScroll="True">
                            <ItemsPresenter/>
                        </ScrollViewer>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
    
            <Setter Property="ItemsPanel">
                <Setter.Value>
                    <ItemsPanelTemplate>
                        <VirtualizingStackPanel IsItemsHost="True"/>
                    </ItemsPanelTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    
        <DataTemplate DataType="{x:Type local:LogEntry}">
            <Grid IsSharedSizeScope="True">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition SharedSizeGroup="Index" Width="Auto"/>
                    <ColumnDefinition SharedSizeGroup="Date" Width="Auto"/>
                    <ColumnDefinition/>
                </Grid.ColumnDefinitions>
    
                <TextBlock Text="{Binding DateTime}" Grid.Column="0"
                           FontWeight="Bold" Margin="5,0,5,0"/>
    
                <TextBlock Text="{Binding Index}" Grid.Column="1"
                           FontWeight="Bold" Margin="0,0,2,0" />
    
                <TextBlock Text="{Binding Message}" Grid.Column="2"
                           TextWrapping="Wrap"/>
            </Grid>
        </DataTemplate>
    
        <DataTemplate DataType="{x:Type local:CollapsibleLogEntry}">
            <Grid IsSharedSizeScope="True">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition SharedSizeGroup="Index" Width="Auto"/>
                    <ColumnDefinition SharedSizeGroup="Date" Width="Auto"/>
                    <ColumnDefinition/>
                </Grid.ColumnDefinitions>
    
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"/>
                    <RowDefinition/>
                </Grid.RowDefinitions>
    
                <TextBlock Text="{Binding DateTime}" Grid.Column="0"
                           FontWeight="Bold" Margin="5,0,5,0"/>
    
                <TextBlock Text="{Binding Index}" Grid.Column="1"
                           FontWeight="Bold" Margin="0,0,2,0" />
    
                <TextBlock Text="{Binding Message}" Grid.Column="2"
                           TextWrapping="Wrap"/>
    
                <ToggleButton x:Name="Expander" Grid.Row="1" Grid.Column="0"
                              VerticalAlignment="Top" Content="+" HorizontalAlignment="Right"/>
    
                <ItemsControl ItemsSource="{Binding Contents}" Style="{StaticResource LogViewerStyle}"
                              Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2"
                              x:Name="Contents" Visibility="Collapsed"/>
    
            </Grid>
            <DataTemplate.Triggers>
                <Trigger SourceName="Expander" Property="IsChecked" Value="True">
                    <Setter TargetName="Contents" Property="Visibility" Value="Visible"/>
                    <Setter TargetName="Expander" Property="Content" Value="-"/>
                </Trigger>
            </DataTemplate.Triggers>
        </DataTemplate>
    </Window.Resources>
    
    <DockPanel>
        <TextBlock Text="{Binding Count, StringFormat='{}{0} Items'}"
                   DockPanel.Dock="Top"/>
    
        <ItemsControl ItemsSource="{Binding}" Style="{StaticResource LogViewerStyle}">
            <ItemsControl.Template>
                <ControlTemplate>
                    <ScrollViewer CanContentScroll="True">
                        <ItemsPresenter/>
                    </ScrollViewer>
                </ControlTemplate>
            </ItemsControl.Template>
            <ItemsControl.ItemsPanel>
                <ItemsPanelTemplate>
                    <VirtualizingStackPanel IsItemsHost="True"/>
                </ItemsPanelTemplate>
            </ItemsControl.ItemsPanel>
        </ItemsControl>
    </DockPanel>
    </Window>
    

代码背后:(请注意,大部分内容只是支持该示例的boileplate(生成随机条目)

 public partial class LogViewer : Window
    {
        private string TestData = "Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum";
        private List<string> words;
        private int maxword;
        private int index;

        public ObservableCollection<LogEntry> LogEntries { get; set; }

        public LogViewer()
        {
            InitializeComponent();

            random = new Random();
            words = TestData.Split(' ').ToList();
            maxword = words.Count - 1;

            DataContext = LogEntries = new ObservableCollection<LogEntry>();
            Enumerable.Range(0, 200000)
                      .ToList()
                      .ForEach(x => LogEntries.Add(GetRandomEntry()));

            Timer = new Timer(x => AddRandomEntry(), null, 1000, 10);
        }

        private System.Threading.Timer Timer;
        private System.Random random;
        private void AddRandomEntry()
        {
            Dispatcher.BeginInvoke((Action) (() => LogEntries.Add(GetRandomEntry())));
        }

        private LogEntry GetRandomEntry()
        {
            if (random.Next(1,10) > 1)
            {
                return new LogEntry()
                {
                    Index = index++,
                    DateTime = DateTime.Now,
                    Message = string.Join(" ", Enumerable.Range(5, random.Next(10, 50))
                                                         .Select(x => words[random.Next(0, maxword)])),
                };
            }

            return new CollapsibleLogEntry()
                       {
                           Index = index++,
                           DateTime = DateTime.Now,
                           Message = string.Join(" ", Enumerable.Range(5, random.Next(10, 50))
                                                        .Select(x => words[random.Next(0, maxword)])),
                           Contents = Enumerable.Range(5, random.Next(5, 10))
                                                .Select(i => GetRandomEntry())
                                                .ToList()
                       };

        }
    }

数据项:

public class LogEntry: PropertyChangedBase
{
    public DateTime DateTime { get; set; }

    public int Index { get; set; }

    public string Message { get; set; }
}

public class CollapsibleLogEntry: LogEntry
{
    public List<LogEntry> Contents { get; set; }
}

PropertyChangedBase:

 public class PropertyChangedBase:INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged(string propertyName)
        {
            Application.Current.Dispatcher.BeginInvoke((Action) (() =>
                                                                     {
                                                                         PropertyChangedEventHandler handler = PropertyChanged;
                                                                         if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
                                                                     }));
        }
    }

答案 1 :(得分:17)

HighCore答案是完美的,但我想它缺少这个要求:“当最后,它应该在添加新项目时继续滚动”。

根据this回答,您可以这样做:

在主ScrollViewer中(在DockPanel内),添加事件:

<ScrollViewer CanContentScroll="True" ScrollChanged="ScrollViewer_ScrollChanged">

投射事件源以进行自动滚动:

    private bool AutoScroll = true;
    private void ScrollViewer_ScrollChanged(object sender, ScrollChangedEventArgs e)
    {
        // User scroll event : set or unset autoscroll mode
        if (e.ExtentHeightChange == 0)
        {   // Content unchanged : user scroll event
            if ((e.Source as ScrollViewer).VerticalOffset == (e.Source as ScrollViewer).ScrollableHeight)
            {   // Scroll bar is in bottom
                // Set autoscroll mode
                AutoScroll = true;
            }
            else
            {   // Scroll bar isn't in bottom
                // Unset autoscroll mode
                AutoScroll = false;
            }
        }

        // Content scroll event : autoscroll eventually
        if (AutoScroll && e.ExtentHeightChange != 0)
        {   // Content changed and autoscroll mode set
            // Autoscroll
            (e.Source as ScrollViewer).ScrollToVerticalOffset((e.Source as ScrollViewer).ExtentHeight);
        }
    }
}