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。
它应符合以下条件：
一般来说，我会想到一些类似 FireBug 和 Chrome 的控制台窗口。
我玩过这个，但我没有取得太大进展，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，并且很想遵循 MVVM 模式。
欢迎任何帮助或指点。
我应该开始销售这些 WPF 示例，而不是免费提供它们。=P
VirtualizingStackPanel提供令人难以置信的出色性能的虚拟化 UI（使用）（即使有 200000 多个项目）DataTemplates 用于每种LogEntry类型。这些使您能够根据需要进行自定义。我只实现了 2 种 LogEntries（基本的和嵌套的），但你明白了。您可以LogEntry根据需要进行子类化。您甚至可以支持富文本或图像。CollectionView.File -> New -> WPF Application，然后自己查看结果。<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>
后面的代码：（ 请注意，其中大部分只是支持示例的样板（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; }
}
属性更改基础：
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));
}));
}
}
HighCore 答案是完美的，但我想它缺少这个要求：“最后，添加新项目时它应该继续滚动”。
根据这个答案，你可以这样做：
在主 ScrollViewer（在 DockPanel 内）中，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);
}
}
}