琐碎的WPF应用程序中的不受管理的泄漏

我已经创建了一个简单的repro应用程序，但是我看不出问题出在哪里.该应用程序由一个包含四个项的ListView组成.将鼠标快速移到这些项目上会导致问题.如果您有兴趣重现此问题，请使用以下代码-它不漂亮，但很简单.谢谢 修改:我创建了一个针对此问题的Microsoft Connect问题. App.xaml <Application x:Class="WpfLeakRepro.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="Window1.xaml"> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Generic.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources></Application> App.xaml.cs using System;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Linq;using System.Windows;namespace WpfLeakRepro{ /// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : Application { }} Generic.xaml <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <LinearGradientBrush x:Key="ListItemHover" EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="Aqua" Offset="0" /> <GradientStop Color="White" Offset="1" /> </LinearGradientBrush> <LinearGradientBrush x:Key="ListItemSelected" EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="Blue" Offset="0" /> <GradientStop Color="White" Offset="1" /> </LinearGradientBrush> <VisualBrush x:Key="CheckeredBackground" Viewport="20,20,20,20" ViewportUnits="Absolute" TileMode="Tile" Stretch="Fill"> <VisualBrush.Visual> <Canvas Opacity="5"> <Rectangle Fill="#FF606060" Height="21" Width="21" Canvas.Top="20" /> <Rectangle Fill="#FF606060" Width="21" Height="21" Canvas.Left="20" /> <Rectangle Fill="#FF646464" Height="21" Width="21" Canvas.Left="20" Canvas.Top="20" /> <Rectangle Fill="#FF646464" Width="21" Height="21" /> </Canvas> </VisualBrush.Visual> </VisualBrush> <Style TargetType="{x:Type ListViewItem}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListViewItem}"> <Border Background="{TemplateBinding Background}"> <Grid> <GridViewRowPresenter /> </Grid> </Border> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="true"> <Setter Property="Background" Value="{DynamicResource ListItemHover}" /> </Trigger> <Trigger Property="IsSelected" Value="true"> <Setter Property="Background" Value="{DynamicResource ListItemSelected}" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style></ResourceDictionary> Window1.xaml <Window x:Class="WpfLeakRepro.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="449" Width="497"> <Grid> <ListView Margin="12" Name="listView" ItemsSource="{Binding}"> <ListView.View> <GridView> <GridView.Columns> <GridViewColumn Header="File Name"> <GridViewColumn.CellTemplate> <DataTemplate> <TextBlock Text="{Binding Name}" /> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Header="Thumbnail"> <GridViewColumn.CellTemplate> <DataTemplate> <Border Background="{DynamicResource CheckeredBackground}" Width="72" Height=48/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridView.Columns> </GridView> </ListView.View> </ListView> </Grid></Window> Window1.xaml.cs using System;using System.Collections.Generic;using System.Linq;using System.Text;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.ComponentModel;using System.Collections.ObjectModel;using System.IO;namespace WpfLeakRepro{ public class Picture { public string Name { get; set; } } /// <summary> /// Interaction logic for Window1.xaml /// </summary> public partial class Window1 : Window { public Window1() { InitializeComponent(); List<Picture> pictures = new List<Picture>(); string[] images = new string[] {"Blue hills.jpg", "Sunset.jpg", "Water lilies.jpg", "Winter.jpg" }; foreach (string imagePath in images) { pictures.Add(new Picture() { Name = imagePath }); } DataContext = pictures; } }}解决方案此问题似乎与用于方格背景的VisualBrush有关.用SolidColorBrush替换它，问题就消失了.但这并不重要:Microsoft的人员建议我安装.NetFx 3.5sp1的最新升级，这似乎可以解决问题(更多详细信息，请参见此处). I've run into a situation where I'm leaking unmanaged memory when the mouse is moved over my WPF app. Specifically, when I profile the application in perfmon or Red Gate's memory profiler, the private bytes monotonically increase, but the bytes in all managed heaps stay constant -- which, I believe, means that the app has an unmanaged leak.I've created a trivial repro app, but I can't see where the problem is.The app consists of a ListView with four items. Moving the mouse rapidly over these items causes the problem.Here is the code if you're interested in reproducing the issue -- it's not pretty, but it's simple.Thanksedit: I've created a Microsoft Connect issue for this problem.App.xaml<Application x:Class="WpfLeakRepro.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="Window1.xaml"> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Generic.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Application.Resources></Application>App.xaml.csusing System;using System.Collections.Generic;using System.Configuration;using System.Data;using System.Linq;using System.Windows;namespace WpfLeakRepro{ /// <summary> /// Interaction logic for App.xaml /// </summary> public partial class App : Application { }}Generic.xaml<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <LinearGradientBrush x:Key="ListItemHover" EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="Aqua" Offset="0" /> <GradientStop Color="White" Offset="1" /> </LinearGradientBrush> <LinearGradientBrush x:Key="ListItemSelected" EndPoint="0,1" StartPoint="0,0"> <GradientStop Color="Blue" Offset="0" /> <GradientStop Color="White" Offset="1" /> </LinearGradientBrush> <VisualBrush x:Key="CheckeredBackground" Viewport="20,20,20,20" ViewportUnits="Absolute" TileMode="Tile" Stretch="Fill"> <VisualBrush.Visual> <Canvas Opacity="5"> <Rectangle Fill="#FF606060" Height="21" Width="21" Canvas.Top="20" /> <Rectangle Fill="#FF606060" Width="21" Height="21" Canvas.Left="20" /> <Rectangle Fill="#FF646464" Height="21" Width="21" Canvas.Left="20" Canvas.Top="20" /> <Rectangle Fill="#FF646464" Width="21" Height="21" /> </Canvas> </VisualBrush.Visual> </VisualBrush> <Style TargetType="{x:Type ListViewItem}"> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type ListViewItem}"> <Border Background="{TemplateBinding Background}"> <Grid> <GridViewRowPresenter /> </Grid> </Border> <ControlTemplate.Triggers> <Trigger Property="IsMouseOver" Value="true"> <Setter Property="Background" Value="{DynamicResource ListItemHover}" /> </Trigger> <Trigger Property="IsSelected" Value="true"> <Setter Property="Background" Value="{DynamicResource ListItemSelected}" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style></ResourceDictionary>Window1.xaml<Window x:Class="WpfLeakRepro.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Window1" Height="449" Width="497"> <Grid> <ListView Margin="12" Name="listView" ItemsSource="{Binding}"> <ListView.View> <GridView> <GridView.Columns> <GridViewColumn Header="File Name"> <GridViewColumn.CellTemplate> <DataTemplate> <TextBlock Text="{Binding Name}" /> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Header="Thumbnail"> <GridViewColumn.CellTemplate> <DataTemplate> <Border Background="{DynamicResource CheckeredBackground}" Width="72" Height=48/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridView.Columns> </GridView> </ListView.View> </ListView> </Grid></Window>Window1.xaml.csusing System;using System.Collections.Generic;using System.Linq;using System.Text;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.ComponentModel;using System.Collections.ObjectModel;using System.IO;namespace WpfLeakRepro{ public class Picture { public string Name { get; set; } } /// <summary> /// Interaction logic for Window1.xaml /// </summary> public partial class Window1 : Window { public Window1() { InitializeComponent(); List<Picture> pictures = new List<Picture>(); string[] images = new string[] {"Blue hills.jpg", "Sunset.jpg", "Water lilies.jpg", "Winter.jpg" }; foreach (string imagePath in images) { pictures.Add(new Picture() { Name = imagePath }); } DataContext = pictures; } }} 解决方案 The issue appears to have something to do with the VisualBrush that was being used for the checkered background. Replace this with a SolidColorBrush, and the issue goes away. But it really doesn't matter: the folks at Microsoft suggested that I install the latest upgrades to .NetFx 3.5sp1, and this seems to fix the problem (more details here). 这篇关于琐碎的WPF应用程序中的不受管理的泄漏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！