我有一个简单的WPF应用程序，在主窗口中我有一个堆栈面板和2个按钮。第一个按钮添加了100个我的用户控件（没有任何数据绑定、事件、位图），第二个按钮从面板中删除所有用户控件并调用GC.Collect()。然而存在一些问题：
1.当我第一次点击“删除”按钮后，并不是所有的内存都被释放，我必须点击几次才能释放更多的内存。
2.5-10分钟后内存才被释放，但还有几兆字节没有被释放。
例如，当我的应用程序启动时，它占用大约22MB的内存。 当我添加500个控件时，它需要大约60MB的内存。 当我第一次点击“删除”按钮时，它需要大约55MB的内存（我等了一段时间，内存没有被释放）。 我点击几次后，内存降至25MB， 我不理解这一点，我是WPF的新手，也许我错过了什么。 我希望能立即释放内存。
例如，当我的应用程序启动时，它占用大约22MB的内存。 当我添加500个控件时，它需要大约60MB的内存。 当我第一次点击“删除”按钮时，它需要大约55MB的内存（我等了一段时间，内存没有被释放）。 我点击几次后，内存降至25MB， 我不理解这一点，我是WPF的新手，也许我错过了什么。 我希望能立即释放内存。
<Window x:Class="WpfApplication10.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MainWindow" Height="385" Width="553">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="25" />
<RowDefinition Height="240*" />
<RowDefinition Height="25" />
</Grid.RowDefinitions>
<Grid
Name="border1"
Grid.Row="1"
HorizontalAlignment="Stretch"
VerticalAlignment="Stretch" >
<ScrollViewer VerticalAlignment="Stretch"
Name="scrollViewer1"
HorizontalAlignment="Stretch">
<StackPanel
Margin="3,3,3,3"
Background="Transparent"
VerticalAlignment="Stretch"
Name="activityStackPanel"
HorizontalAlignment="Stretch">
</StackPanel>
</ScrollViewer>
</Grid>
<Button Content="Button" Grid.Row="2" Height="23" HorizontalAlignment="Left" Margin="12,0,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
<Button Content="Button" Grid.Row="2" Height="23" HorizontalAlignment="Left" Margin="141,0,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="button2_Click" />
<Label Content="Label" Grid.RowSpan="2" Height="28" HorizontalAlignment="Left" Margin="34,0,0,0" Name="label1" VerticalAlignment="Top" />
</Grid>
namespace WpfApplication10
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void button1_Click(object sender, RoutedEventArgs e)
{
int N = 100;
//var r = new ActivityStatisticItem("111", "222", DateTime.Now, "333", 1);
for (int i = 0; i < N; i++)
{
activityStackPanel.Children.Add(new UserControl1());
}
label1.Content = activityStackPanel.Children.Count;
}
private void button2_Click(object sender, RoutedEventArgs e)
{
activityStackPanel.Children.Clear();
label1.Content = activityStackPanel.Children.Count;
GC.Collect();
GC.WaitForPendingFinalizers();
GC.Collect();
}
}
}
<UserControl x:Class="WpfApplication10.UserControl1"
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"
Background="Transparent"
Margin="0,2,0,2"
MinHeight="80"
MinWidth="130"
MaxHeight="80">
<Grid Width="441">
<Grid.RowDefinitions>
<RowDefinition Height="40" Name="rowTop" />
<RowDefinition Height="40" Name="rowBottom"/>
</Grid.RowDefinitions>
<Border BorderBrush="Gray"
BorderThickness="1"
HorizontalAlignment="Stretch"
Background="LightGreen"
Name="contactPanel"
CornerRadius="3,3,3,3"
VerticalAlignment="Stretch" Panel.ZIndex="1" >
<Grid
VerticalAlignment="Stretch"
Name="grid1"
Margin="3,0,3,0"
HorizontalAlignment="Stretch">
<Label Content="Contact" Height="15" HorizontalAlignment="Left" Margin="15,3,0,0" Name="headerLabel" Padding="0" VerticalAlignment="Top" FontSize="10" FontWeight="DemiBold"/>
<Label Content="00/00/0000 00:00:00" Height="15" HorizontalAlignment="Left" Margin="13,18,0,0" Name="timeLabel" Padding="0" VerticalAlignment="Top" FontSize="10" Width="100" FontWeight="DemiBold" />
<Label Content="00:00:00" Height="15" HorizontalAlignment="Right" Margin="0,18,0,0" Name="durationLabel" Padding="0" VerticalAlignment="Top" FontSize="10" Width="38" FontWeight="DemiBold"/>
<!--<Image Height="12" HorizontalAlignment="Left" Margin="0,3,0,0" Name="directionPictureBox" Stretch="Fill" VerticalAlignment="Top" Width="12" />
<Image Height="12" HorizontalAlignment="Right" Margin="0,20,41,0" Name="timerImage" Stretch="Fill" VerticalAlignment="Top" Width="12" />
<Image Height="12" HorizontalAlignment="Left" Margin="0,20,0,0" Name="dateTimeImage" Stretch="Fill" VerticalAlignment="Top" Width="12" />-->
</Grid>
</Border>
<Border BorderBrush="Gray"
BorderThickness="1,0,1,1"
Grid.Row="1"
Background="White"
HorizontalAlignment="Stretch"
Margin="10,0,10,0"
Name="detailsPanel"
CornerRadius="0,0,3,3"
VerticalAlignment="Stretch">
<Grid HorizontalAlignment="Stretch"
Name="grid2"
Margin="3,0,3,0"
VerticalAlignment="Stretch">
<Label Content="Label" Height="15" HorizontalAlignment="Stretch" FontSize="9" Padding="0" Margin="0,3,0,0" Name="numberRadLabel" VerticalAlignment="Top" />
<Label Content="Label" Height="15" HorizontalAlignment="Stretch" FontSize="9" Padding="0" Margin="0,18,0,0" Name="queueRadLabel" VerticalAlignment="Top" />
</Grid>
</Border>
</Grid>
在用户控件中，我只有
public UserControl1()
{
InitializeComponent();
}