在上一个问题中,我询问了如何在类似WPF文本框的元素(WPF append text blocks UI thread heavily but WinForms doesn't?)中获得实时日志输出。那里的答案使我使用了FlowDocumentScrollViewer
,它的确比RichTextBox
快得多。但是,我发现运行具有大量文本输出的命令(例如'svn co')会导致WPF应用程序的运行速度明显下降。在 checkout 3或4个非常大的svn分支后切换标签需要3-4秒,而且我确定时间会随着我 checkout 的次数而增加。滚动也有明显的滞后。
如我上面链接的问题所述,我最近将应用程序从Windows窗体切换到了WPF。我非常喜欢WPF-它具有许多Forms所没有的优势。但是,至少对于我来说,性能似乎是WPF中的一个大问题。在我的应用程序的Forms版本中,我可以将大量文本打印到RichTextBox
控件中,而在我的应用程序中丝毫没有降低速度。切换选项卡是即时的,并且滚动是无缝的。这是我想要在WPF应用程序中获得的体验。
所以我的问题是:如何改善FlowDocumentScrollViewer
的性能以使其与Windows窗体RichTextBox
的性能相匹配,而又不丢失粗体和斜体等格式设置功能,又不丧失复制/粘贴功能?我愿意切换WPF控件,只要它们提供我想要的格式设置功能即可。
这是我的打印代码,以供引用:
public void PrintOutput(String s)
{
if (outputParagraph.FontSize != defaultFontSize)
{
outputParagraph = new Paragraph();
outputParagraph.Margin = new Thickness(0);
outputParagraph.FontFamily = font;
outputParagraph.FontSize = defaultFontSize;
outputParagraph.TextAlignment = TextAlignment.Left;
OutputBox.Document.Blocks.Add(outputParagraph);
}
outputParagraph.Inlines.Add(s);
if (!clearOutputButton.IsEnabled) clearOutputButton.IsEnabled = true;
}
public void PrintImportantOutput(String s)
{
if (outputParagraph.FontSize != importantFontSize)
{
outputParagraph = new Paragraph();
outputParagraph.Margin = new Thickness(0);
outputParagraph.FontFamily = font;
outputParagraph.FontSize = importantFontSize;
outputParagraph.TextAlignment = TextAlignment.Left;
OutputBox.Document.Blocks.Add(outputParagraph);
}
String timestamp = DateTime.Now.ToString("[hh:mm.ss] ");
String toPrint = timestamp + s;
outputParagraph.Inlines.Add(new Bold(new Run(toPrint)));
if (!clearOutputButton.IsEnabled) clearOutputButton.IsEnabled = true;
}
在打印“重要”文本时,我会切换字体大小并使文本变为粗体。该代码之所以如此多行,是因为我试图对所有文本重复使用同一段落,直到点击“重要”文本为止。我添加了一个包含所有“重要”文本的新段落,然后在切换回非重要文本并添加到该段落之前添加了另一个段落,直到我点击了更多“重要”文本为止。我希望重新使用同一段可以提高性能。
另外,应该注意的是,我正在将stdout打印到一个
FlowDocumentScrollViewer
,将stderr打印到另一FlowDocumentScrollViewer
,并且一次都打印到第三FlowDocumentScrollViewer
。因此,每行stdout和stderr在技术上都会被打印两次,从而使我的应用程序负担加倍。同样,这不是WinForms中的问题。以下是注释中要求的完整代码示例。它非常简单(3 FlowDocumentScrollViewer的操作和简单的打印),但仍会拖慢大约20000行文本的大量显示时间,而且更糟糕的是。
编辑:代码示例已被删除。代替它的是解决我的性能问题的工作代码。它的工作原理与
FlowDocumentScrollViewer
相同,但有一个异常(exception):您不能选择行的子字符串。我正在解决这个问题,尽管这似乎很困难。Bridge.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Documents;
using System.Threading;
using System.Collections.Concurrent;
using System.Threading.Tasks;
namespace PerformanceTest
{
public class Bridge
{
int counterLimit;
public BlockingCollection<PrintInfo> output;
public BlockingCollection<PrintInfo> errors;
public BlockingCollection<PrintInfo> logs;
protected static Bridge controller = new Bridge();
public static Bridge Controller
{
get
{
return controller;
}
}
public MainWindow Window
{
set
{
if (value != null)
{
output = value.outputProducer;
errors = value.errorProducer;
logs = value.logsProducer;
}
}
}
public bool Running
{
get;
set;
}
private Bridge()
{
//20000 lines seems to slow down tabbing enough to prove my point.
//increase this number to get even worse results.
counterLimit = 40000;
}
public void PrintLotsOfText()
{
new Thread(new ThreadStart(GenerateOutput)).Start();
new Thread(new ThreadStart(GenerateError)).Start();
}
private void GenerateOutput()
{
//There is tons of output text, so print super fast if possible.
int counter = 1;
while (Running && counter < counterLimit)
{
if (counter % 10 == 0)
PrintImportantOutput("I will never say this horrible word again as long I live. This is confession #" + counter++ + ".");
else
PrintOutput("I will never say this horrible word again as long I live. This is confession #" + counter++ + ".");
//Task.Delay(1).Wait();
}
Console.WriteLine("GenerateOutput thread should end now...");
}
private void GenerateError()
{
int counter = 1;
while (Running && counter < counterLimit)
{
PrintError("I will never forgive your errors as long I live. This is confession #" + counter++ + ".");
//Task.Delay(1).Wait();
}
Console.WriteLine("GenerateError thread should end now...");
}
#region Printing
delegate void StringArgDelegate(String s);
delegate void InlineArgDelegate(Inline inline);
public void PrintOutput(String s)
{
output.TryAdd(new PrintInfo(s, false));
PrintLog("d " + s);
}
public void PrintImportantOutput(String s)
{
output.TryAdd(new PrintInfo(s, true));
PrintLog("D " + s);
}
public void PrintError(String s)
{
errors.TryAdd(new PrintInfo(s, false));
PrintLog("e " + s);
}
public void PrintImportantError(String s)
{
errors.TryAdd(new PrintInfo(s, true));
PrintLog("E " + s);
}
public void PrintLog(String s)
{
logs.TryAdd(new PrintInfo(s, false));
}
#endregion
}
public class PrintInfo
{
public String Text { get; set; }
public bool IsImportant { get; set; }
public PrintInfo() { }
public PrintInfo(String text, bool important)
{
Text = text;
IsImportant = important;
}
}
}
MainWindow.xaml
<Window x:Class="PerformanceTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
xmlns:l="clr-namespace:PerformanceTest"
WindowStartupLocation="CenterScreen">
<Grid>
<TabControl>
<TabControl.Resources>
<Style TargetType="ListBox">
<Setter Property="TextElement.FontFamily" Value="Consolas" />
<Setter Property="TextElement.FontSize" Value="12" />
<Setter Property="VirtualizingStackPanel.IsVirtualizing" Value="True" />
<Setter Property="VirtualizingStackPanel.VirtualizationMode" Value="Recycling" />
<Setter Property="l:ListBoxSelector.Enabled" Value="True" />
<Setter Property="ContextMenu">
<Setter.Value>
<ContextMenu>
<MenuItem Command="Copy" />
</ContextMenu>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="ListBoxItem">
<Setter Property="HorizontalAlignment" Value="Left" />
<Setter Property="Margin" Value="0" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="ListBoxItem">
<TextBlock Text="{Binding Text}" TextWrapping="Wrap"
Background="{TemplateBinding Background}"
Foreground="{TemplateBinding Foreground}"
FontWeight="{TemplateBinding FontWeight}" />
<ControlTemplate.Triggers>
<DataTrigger Binding="{Binding IsImportant}" Value="true">
<Setter Property="TextElement.FontWeight" Value="SemiBold" />
<Setter Property="TextElement.FontSize" Value="14" />
</DataTrigger>
<Trigger Property="IsSelected" Value="true">
<Setter Property="Background" Value="{StaticResource {x:Static SystemColors.HighlightBrushKey}}" />
<Setter Property="Foreground" Value="{StaticResource {x:Static SystemColors.HighlightTextBrushKey}}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</TabControl.Resources>
<TabItem Header="Bridge">
<StackPanel Orientation="Vertical" HorizontalAlignment="Left">
<Button Content="Start Test" Click="StartButton_Click" />
<Button Content="End Test" Click="EndButton_Click" />
</StackPanel>
</TabItem>
<TabItem Header="Output">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<!--<RichTextBox x:Name="OutputBox" ScrollViewer.VerticalScrollBarVisibility="Auto"/>-->
<ListBox Grid.Column="0" ItemsSource="{Binding Output,RelativeSource={RelativeSource FindAncestor,AncestorType=Window}}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.CommandBindings>
<CommandBinding Command="Copy" Executed="CopyExecuted" />
</ListBox.CommandBindings>
</ListBox>
<GridSplitter Grid.Column="1" Width="5" ResizeBehavior="PreviousAndNext" />
<ListBox Grid.Column="2" ItemsSource="{Binding Errors,RelativeSource={RelativeSource FindAncestor,AncestorType=Window}}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.CommandBindings>
<CommandBinding Command="Copy" Executed="CopyExecuted" />
</ListBox.CommandBindings>
</ListBox>
</Grid>
</TabItem>
<TabItem Header="Log">
<Grid>
<ListBox Grid.Column="0" ItemsSource="{Binding Logs,RelativeSource={RelativeSource FindAncestor,AncestorType=Window}}"
ScrollViewer.HorizontalScrollBarVisibility="Disabled">
<ListBox.CommandBindings>
<CommandBinding Command="Copy" Executed="CopyExecuted" />
</ListBox.CommandBindings>
</ListBox>
</Grid>
</TabItem>
</TabControl>
</Grid>
</Window>
MainWindow.xaml.cs
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
using System.Threading;
namespace PerformanceTest
{
///
/// Interaction logic for MainWindow.xaml
///
public partial class MainWindow : Window
{
public BlockingCollection<PrintInfo> outputProducer = new BlockingCollection<PrintInfo>();
public BlockingCollection<PrintInfo> errorProducer = new BlockingCollection<PrintInfo>();
public BlockingCollection<PrintInfo> logsProducer = new BlockingCollection<PrintInfo>();
public ObservableCollection<PrintInfo> Output { get; set; }
public ObservableCollection<PrintInfo> Errors { get; set; }
public ObservableCollection<PrintInfo> Logs { get; set; }
protected FontFamily font = new FontFamily("Consolas");
protected int defaultFontSize = 12;
protected int importantFontSize = 14;
Dispatcher dispatcher;
public MainWindow()
{
Bridge.Controller.Window = this;
try
{
InitializeComponent();
}
catch (Exception ex)
{
Console.WriteLine(ex.InnerException.ToString());
Console.WriteLine(ex.StackTrace);
}
dispatcher = Dispatcher;
Output = new ObservableCollection<PrintInfo>();
Errors = new ObservableCollection<PrintInfo>();
Logs = new ObservableCollection<PrintInfo>();
new Thread(new ThreadStart(() => Print(outputProducer, Output))).Start();
new Thread(new ThreadStart(() => Print(errorProducer, Errors))).Start();
new Thread(new ThreadStart(() => Print(logsProducer, Logs))).Start();
}
public delegate void EmptyDelegate();
public void Print(BlockingCollection<PrintInfo> producer, ObservableCollection<PrintInfo> target)
{
try
{
foreach (var info in producer.GetConsumingEnumerable())
{
dispatcher.Invoke(new EmptyDelegate(() =>
{
if (info.IsImportant)
{
String timestamp = DateTime.Now.ToString("[hh:mm.ss] ");
String toPrint = timestamp + info.Text;
info.Text = toPrint;
}
target.Add(info);
}), DispatcherPriority.Background);
}
}
catch (TaskCanceledException)
{
//window closing before print finish
}
}
private void StartButton_Click(object sender, RoutedEventArgs e)
{
if (!Bridge.Controller.Running)
{
Bridge.Controller.Running = true;
Bridge.Controller.PrintLotsOfText();
}
}
private void EndButton_Click(object sender, RoutedEventArgs e)
{
Bridge.Controller.Running = false;
}
private void CopyExecuted(object sender, ExecutedRoutedEventArgs e)
{
ListBox box = sender as ListBox;
HashSet<PrintInfo> allItems = new HashSet<PrintInfo>(box.Items.OfType<PrintInfo>());
HashSet<PrintInfo> selectedItems = new HashSet<PrintInfo>(box.SelectedItems.OfType<PrintInfo>());
IEnumerable<PrintInfo> sortedItems = allItems.Where(i => selectedItems.Contains(i));
IEnumerable<String> copyItems = from i in sortedItems select i.Text;
string log = string.Join("\r\n", copyItems);
Clipboard.SetText(log);
}
}
}
ListBoxSelector.cs在@pushpraj的答案中。
最佳答案
我执行您提供的示例,除了少数线程问题外,最大的问题是数据量。这会随着文本的增长而减慢文本的渲染速度。
我试图用另一种方式重写您的代码。我使用Tasks,BlockingCollection和Virtualization来提高性能,并假设应用程序的主要兴趣是日志记录速度。
Bridge.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Documents;
using System.Threading;
using System.Collections.Concurrent;
using System.Threading.Tasks;
namespace PerformanceTest
{
public class Bridge
{
int counterLimit;
public BlockingCollection<string> output;
public BlockingCollection<string> impOutput;
public BlockingCollection<string> errors;
public BlockingCollection<string> impErrors;
public BlockingCollection<string> logs;
protected static Bridge controller = new Bridge();
public static Bridge Controller
{
get
{
return controller;
}
}
public MainWindow Window
{
set
{
if (value != null)
{
output = value.outputProducer;
impOutput = value.impOutputProducer;
errors = value.errorProducer;
impErrors = value.impErrorProducer;
logs = value.logsProducer;
}
}
}
public bool Running
{
get;
set;
}
private Bridge()
{
//20000 lines seems to slow down tabbing enough to prove my point.
//increase this number to get even worse results.
counterLimit = 40000;
}
public void PrintLotsOfText()
{
Task.Run(() => GenerateOutput());
Task.Run(() => GenerateError());
}
private void GenerateOutput()
{
//There is tons of output text, so print super fast if possible.
int counter = 1;
while (Running && counter < counterLimit)
{
PrintOutput("I will never say this horrible word again as long I live. This is confession #" + counter++ + ".");
//Task.Delay(1).Wait();
}
}
private void GenerateError()
{
int counter = 1;
while (Running && counter < counterLimit)
{
PrintError("I will never forgive your errors as long I live. This is confession #" + counter++ + ".");
//Task.Delay(1).Wait();
}
}
#region Printing
delegate void StringArgDelegate(String s);
delegate void InlineArgDelegate(Inline inline);
public void PrintOutput(String s)
{
output.TryAdd(s);
PrintLog("d " + s);
}
public void PrintImportantOutput(String s)
{
impOutput.TryAdd(s);
PrintLog("D " + s);
}
public void PrintError(String s)
{
errors.TryAdd(s);
PrintLog("e " + s);
}
public void PrintImportantError(String s)
{
impErrors.TryAdd(s);
PrintLog("E " + s);
}
public void PrintLog(String s)
{
String text = s;
logs.TryAdd(text);
}
#endregion
}
}
MainWindow.xaml
<Window x:Class="PerformanceTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow"
WindowStartupLocation="CenterScreen">
<Grid>
<TabControl>
<TabControl.Resources>
<Style TargetType="ListBox">
<Setter Property="TextElement.FontFamily"
Value="Consolas" />
<Setter Property="TextElement.FontSize"
Value="12" />
<Setter Property="VirtualizingPanel.IsVirtualizing"
Value="True" />
<Setter Property="VirtualizingPanel.VirtualizationMode"
Value="Recycling" />
</Style>
</TabControl.Resources>
<TabItem Header="Bridge">
<StackPanel Orientation="Vertical"
HorizontalAlignment="Left">
<Button Content="Start Test"
Click="StartButton_Click" />
<Button Content="End Test"
Click="EndButton_Click" />
</StackPanel>
</TabItem>
<TabItem Header="Output">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<ListBox Grid.Column="0"
ItemsSource="{Binding Output,RelativeSource={RelativeSource FindAncestor,AncestorType=Window}}" />
<GridSplitter Grid.Column="1"
Width="5"
ResizeBehavior="PreviousAndNext" />
<ListBox Grid.Column="2"
ItemsSource="{Binding Errors,RelativeSource={RelativeSource FindAncestor,AncestorType=Window}}" />
</Grid>
</TabItem>
<TabItem Header="Log">
<Grid>
<ListBox Grid.Column="0"
ItemsSource="{Binding Logs,RelativeSource={RelativeSource FindAncestor,AncestorType=Window}}" />
</Grid>
</TabItem>
</TabControl>
</Grid>
</Window>
MainWindow.xaml.cs
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;
namespace PerformanceTest
{
///
/// Interaction logic for MainWindow.xaml
///
public partial class MainWindow : Window
{
public BlockingCollection<string> outputProducer = new BlockingCollection<string>();
public BlockingCollection<string> impOutputProducer = new BlockingCollection<string>();
public BlockingCollection<string> errorProducer = new BlockingCollection<string>();
public BlockingCollection<string> impErrorProducer = new BlockingCollection<string>();
public BlockingCollection<string> logsProducer = new BlockingCollection<string>();
public ObservableCollection<object> Output { get; set; }
public ObservableCollection<object> Errors { get; set; }
public ObservableCollection<object> Logs { get; set; }
Dispatcher dispatcher;
public MainWindow()
{
Bridge.Controller.Window = this;
try
{
InitializeComponent();
}
catch (Exception ex)
{
Console.WriteLine(ex.InnerException.ToString());
Console.WriteLine(ex.StackTrace);
}
dispatcher = Dispatcher;
Output = new ObservableCollection<object>();
Errors = new ObservableCollection<object>();
Logs = new ObservableCollection<object>();
Task.Run(() => Print(outputProducer, Output));
Task.Run(() => Print(errorProducer, Errors));
Task.Run(() => Print(logsProducer, Logs));
}
public void Print(BlockingCollection<string> producer, ObservableCollection<object> target)
{
try
{
foreach (var str in producer.GetConsumingEnumerable())
{
dispatcher.Invoke(() =>
{
target.Insert(0, str);
}, DispatcherPriority.Background);
}
}
catch (TaskCanceledException)
{
//window closing before print finish
}
}
private void StartButton_Click(object sender, RoutedEventArgs e)
{
if (!Bridge.Controller.Running)
{
Bridge.Controller.Running = true;
Bridge.Controller.PrintLotsOfText();
}
}
private void EndButton_Click(object sender, RoutedEventArgs e)
{
Bridge.Controller.Running = false;
}
}
}
有关完整的工作示例,请下载PerformanceTest.zip,并查看它是否接近您的需求。我只重写了一部分。如果此示例朝着理想的方向发展,我们可以实现其余功能。如果您想减慢生产速度以查看混合日志,请在Bridge.cs中取消对
Task.Delay(1).Wait();
的注释,否则日志生成太快,因此在“日志”选项卡中一个接一个地显示。