问题描述
我正在创建一个WPF程序，用于使用Syncfusion库编辑PowerPoint演示文稿，但是每当我运行该程序时，从页面导航到另一个页面时，都会看到内存增加。我将WPF应用程序与在多个页面之间导航的窗口一起使用。
实际上如何遇到这个问题？
谢谢。
这些照片显示了泄漏的位置：
PS：，请专注于home.cs中的InitializeNonUITasks方法，因为这就是泄漏所在。
主页XAML：
<Page x:Class="ProjectSABX.Pages.Home"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:local="clr-namespace:ProjectSABX.Pages"
xmlns:syncfusion="clr-namespace:Syncfusion.Windows;assembly=Syncfusion.Shared.Wpf"
xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
mc:Ignorable="d"
Width="1175" Height="660" KeyDown="Window_KeyDown"
Title="Home">
<Grid ShowGridLines="False" Margin="2,-2,2">
<Grid Grid.Row="0" ShowGridLines="False">
<Grid.Background>
<SolidColorBrush Color="White" Opacity="0.5" />
</Grid.Background>
<Grid.RowDeFinitions>
<RowDeFinition Height="2.5*"></RowDeFinition>
</Grid.RowDeFinitions>
<Rectangle Height="52" Grid.Row="0" VerticalAlignment="Top" Fill="#FF80A20D"></Rectangle>
<TextBlock Name="titleBarTextBlock" Text="Aperçu" Height="40" Foreground="White" FontFamily="Segoe UI" FontWeight="normal" Padding="15" FontSize="17.75" VerticalAlignment="Top" Grid.Row="0" HorizontalAlignment="Center"></TextBlock>
<StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="0 15 10 0" Grid.Column="3" Grid.Row="0">
</StackPanel>
<Image Source="/Images/ViewerIcons/ppt__logo for header.png" Grid.Column="0" HorizontalAlignment="Left" Margin="15" VerticalAlignment="Top" Height="30"></Image>
</Grid>
<Grid Grid.Row="1" ShowGridLines="False">
<Grid.RowDeFinitions>
<RowDeFinition Height="0*" />
<RowDeFinition Height="445*" />
<RowDeFinition Height="Auto" />
<RowDeFinition Height="59*"></RowDeFinition>
</Grid.RowDeFinitions>
<Grid.ColumnDeFinitions>
<ColumnDeFinition Width="2*" />
<ColumnDeFinition Width="8*" />
</Grid.ColumnDeFinitions>
<Border ClipToBounds="True" BorderBrush="Black" BorderThickness=".7" Grid.Row="1" Grid.Column="0" Grid.RowSpan ="3" Margin="0,51,3,0">
<ScrollViewer Name="scrollViewer" Focusable="False" CanContentScroll="False" BorderBrush="Black" BorderThickness="1" HorizontalScrollBarVisibility="Auto" Grid.Row="1" Grid.Column="0" Grid.RowSpan ="3">
<Grid ShowGridLines="False">
<Grid.ColumnDeFinitions>
<ColumnDeFinition Width="1*" />
<ColumnDeFinition Width="9*" />
</Grid.ColumnDeFinitions>
<StackPanel Name="stackpanel" Grid.Column="1" Width="170" />
</Grid>
</ScrollViewer>
</Border>
<Image Name ="centerSlideImage" Grid.Row="1" Grid.Column="1" Margin="0,57,5,19" />
<Canvas Name="loadingIndicatorCanvas" Visibility="Collapsed" HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Row="1" Grid.Column="1" Margin="-250,-100,0">
<Canvas Canvas.Left="21.75" Canvas.Top="14" Height="81.302" Width="80.197">
<Canvas.Resources>
<Style targettype="Ellipse">
<Setter Property="Width" Value="5" />
<Setter Property="Height" Value="5" />
<Setter Property="Fill" Value="#FF9BD226" />
</Style>
</Canvas.Resources>
<Ellipse x:Name="_00" Canvas.Left="24.75" Canvas.Top="50" />
<Ellipse x:Name="_01" Canvas.Top="36" Canvas.Left="29.5" />
<Ellipse x:Name="_02" Canvas.Left="43.5" Canvas.Top="29.75" />
<Ellipse x:Name="_03" Canvas.Left="57.75" Canvas.Top="35.75" />
<Ellipse x:Name="_04" Canvas.Left="63.5" Canvas.Top="49.75" />
<Ellipse x:Name="_05" Canvas.Left="57.75" Canvas.Top="63.5" />
<Ellipse x:Name="_06" Canvas.Left="43.75" Canvas.Top="68.75" />
<Ellipse x:Name="_07" Canvas.Top="63.25" Canvas.Left="30" />
<Ellipse stroke="{x:Null}" Width="39.5" Height="39.5" Canvas.Left="31.75" Canvas.Top="37" Fill="{x:Null}" />
</Canvas>
</Canvas>
<Grid Grid.Row="3" Grid.Column="1" ShowGridLines="False" Margin="0,-10">
<Grid.RowDeFinitions>
<RowDeFinition Height="0.5*" />
<RowDeFinition Height="20*" />
<RowDeFinition Height="10*" />
</Grid.RowDeFinitions>
<Grid.ColumnDeFinitions>
<ColumnDeFinition Width="42*" />
<ColumnDeFinition Width="45*" />
<ColumnDeFinition Width="44*" />
<ColumnDeFinition Width="45*" />
<ColumnDeFinition Width="238*" />
<ColumnDeFinition Width="30*" />
<ColumnDeFinition Width="40*" />
<ColumnDeFinition Width="46*" />
<ColumnDeFinition Width="30*" />
<ColumnDeFinition Width="45*" />
</Grid.ColumnDeFinitions>
<Image Name="opendocument" Grid.Row="1" Grid.Column="1" Height="30" Width="30" Source="/Images/ViewerIcons/ppt__open.png" MouseDown="opendocument_MouseDown" MouseEnter="opendocument_MouseEnter" MouseLeave="opendocument_MouseLeave" Margin="0,7,4"></Image>
<Image Name="createPdfDocument" Grid.Row="1" Grid.Column="3" Height="30" Width="30" Source="/Images/ViewerIcons/ppt_pdf.png" MouseDown="createPdfDocument_MouseDown" MouseEnter="createPdfDocument_MouseEnter" MouseLeave="createPdfDocument_MouseLeave" Margin="0,8,4"></Image>
<DockPanel Grid.Row="1" Grid.Column="6" Grid.ColumnSpan="3">
<Image Name="prevDocument" Height="30" Width="30" Source="/Images/ViewerIcons/ppt__back.png" MouseDown="prevDocument_MouseDown" MouseEnter="prevDocument_MouseEnter" MouseLeave="prevDocument_MouseLeave"></Image>
<Label Name="lblPagedisplay" Height="30" MinWidth="30" FontFamily="Segoe UI" FontWeight="Bold" FontSize="18" VerticalAlignment="Center" VerticalContentAlignment="Center" Padding="35,0" Foreground="#646464" />
<Image Name="NextDocumentIconImage" Height="30" Width="30" Source="/Images/ViewerIcons/ppt__for.png" MouseDown="NextDocument_MouseDown" MouseEnter="NextDocument_MouseEnter" MouseLeave="NextDocument_MouseLeave" Margin="-10,0"></Image>
</DockPanel>
</Grid>
</Grid>
</Grid>
首页C＃：
public Home()
{
InitializeComponent();
pdfBackroundWorker.DoWork += pdfBackroundWorker_DoWork;
pdfBackroundWorker.RunWorkerCompleted += pdfBackroundWorker_RunWorkerCompleted;
this.Background = new SolidColorBrush(Color.Fromrgb(244,244,244));
filePath = "/Data/Template.pptx";
InitializeNonUITasks();
InitializeUITasks(filePath);
}
private void opendocument_MouseDown(object sender,MouseButtonEventArgs e)
{
Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();
dlg.Filter = "PowerPoint Presentations|*.pptx";
Nullable<bool> result = dlg.ShowDialog();
if (result == true)
{
string filename = dlg.FileName;
filePath = filename;
slideNumber = 1;
displayBackroundWorker.RunWorkerAsync();
}
}
private void InitializeNonUITasks()
{
try
{
presentation = Presentation.Open(filePath);
}
catch (Exception exp)
{
MessageBox.Show("This PowerPoint Presentation cannot be opened properly,please contact support");
return;
}
slideImageSources.Clear();
thumbnailImageSource.Clear();
printimages.Clear();
currentSlideNumber = 0;
presentation.ChartToImageConverter = new ChartToImageConverter();
presentation.ChartToImageConverter.ScalingMode = Syncfusion.OfficeChart.ScalingMode.Best;
try
{
foreach (ISlide slide in presentation.Slides)
{
using (System.Drawing.Image image = slide.ConvertToImage(Syncfusion.Drawing.ImageType.Bitmap))
{
System.Drawing.Image.GetThumbnailImageAbort myCallback = new System.Drawing.Image.GetThumbnailImageAbort(ThumbnailCallback);
printimages.Add(image.Clone() as System.Drawing.Image);
System.Drawing.Image newImage = image.GetThumbnailImage(170,100,myCallback,system.intPtr.Zero);
using (Stream ms = new MemoryStream())
{
newImage.Save(ms,System.Drawing.Imaging.ImageFormat.Png);
var decoder = BitmapDecoder.Create(ms,BitmapCreateOptions.PreservePixelFormat,BitmapCacheOption.OnLoad);
thumbnailImageSource.Add(decoder.Frames[0]);
}
using (Stream ms = new MemoryStream())
{
image.Save(ms,BitmapCacheOption.OnLoad);
slideImageSources.Add(decoder.Frames[0]);
}
}
}
}
catch (Exception)
{
MessageBox.Show("This PowerPoint Presentation cannot be converted to images properly,please contact support");
return;
}
}
MainWindow XAML：
<Frame Grid.Column="1" Grid.Row="1" NavigationUIVisibility="Hidden" x:Name="Main" Source="./Pages/Home.xaml">
<Frame.Background>
<SolidColorBrush Color="#FFB0B0B0" Opacity="0.49" />
</Frame.Background>
</Frame>
MainWindow.cs：
public partial class MainWindow : Window
{
public MainWindow()
{
DataContext = this;
InitializeComponent();
}
private void ButtonClickHomePage(object sender,RoutedEventArgs e)
{
Main.Content = new Home();
}
}
Edit1 ：我尝试对实现Idisposable的每个对象使用dispose（）方法，当初次导航时，存储过程减少了。然后当我从一个页面导航到另一个页面时。
解决方法
很难这样确定问题，但我确实有一些建议：
通常，这是关于在实现Dispose接口的所有对象上调用IDisposable。
- 检查
IDisposable接口的所有对象，并调用Dispose()（如果有）。例如：newImage.Dispose（）（或使用using） - 此外，列表
printImages，thumbnailImageSource等中的所有一次性物品也应丢弃。 - 此外，我相信
decoder和presentation也应被处置，尽管我可能会误会。
这将为您提供一个很好的起点-可能还有更多，但是您应该排除并首先解决此问题。
该循环很可能会导致内存增加。
有关IDisposable的更多信息。另外，如果您自己实现了IDisposable接口，那么也很容易犯错误。在这种情况下，您应该仔细检查。
我们无法使用给定的代码示例来重现所提到的问题。作为参考，我们附上了我们尝试使用的示例，以重现上述问题。
示例链接 https://www.syncfusion.com/downloads/support/directtrac/general/ze/PresentationSample-1588894092
在此示例中，最大内存使用量大约少于500MB。因此，请向我们提供上述内容的修改后的示例，以重现上述问题，以便我们可以进一步进行分析并为您提供适当的详细信息。