Question

我有一个datagrid，当单击一个按钮时会更新。但是在某些情况下，数据需要30秒+才能返回，窗口会冻结。我希望能够从另一个线程获取数据并填充datagrid，以免挂起主窗口。 DataGrid是只读的。最终希望有一个“取消”按钮和动画来表示进度，但现在只想让这个工作。

我制作了一个可以证明问题的示例程序，该程序基于http://learn-powershell.net/2012/10/14/powershell-and-wpf-writing-data-to-a-ui-from-a-different-runspace/

我已经尝试过使用Start-Job / Receive Job和.NET Background worker但没有成功。该脚本将用于Server 2012 R2上的PowerShell v4和Windows 10上的PowerShell v5。

$syncHash = [hashtable]::Synchronized(@{})
$syncHash.AutoResetEvent = New-Object System.Threading.AutoResetEvent($false)

$newRunspace =[runspacefactory]::CreateRunspace()
$newRunspace.ApartmentState = "STA"
$newRunspace.ThreadOptions = "ReuseThread"         
$newRunspace.Open()
$newRunspace.SessionStateProxy.SetVariable("syncHash",$syncHash)          

$psCmd = [PowerShell]::Create().AddScript({   
[xml]$xaml = @"
<Window 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:local="clr-namespace:DataTool"
        Name="mainWindow"
        Title="Data Tool" WindowStyle="ToolWindow" SizeToContent="WidthAndHeight" ResizeMode="CanMinimize">

        <Grid Margin="10" Name="mainGrid">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>
        <DataGrid Name="myDataGrid" SelectionUnit="FullRow" IsReadOnly="True" Margin="5" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="5" AutoGenerateColumns="True" Height="200" MaxWidth="900">
        </DataGrid>
        <Button Name="buttonRefresh" Margin="10" Padding="20,5,20,5" Grid.Row="1" Grid.Column="0" HorizontalAlignment="Stretch">Refresh</Button>
    </Grid>
</Window>
"@

    $reader=(New-Object System.Xml.XmlNodeReader $xaml)
    $syncHash.Window=[Windows.Markup.XamlReader]::Load( $reader )
    $xaml.SelectNodes("//*[@Name]") | %{
        $syncHash[$_.Name] = $syncHash.Window.FindName($_.Name)
    }

    $syncHash.AutoResetEvent.Set()
    $syncHash.Window.ShowDialog() | Out-Null
    $syncHash.Error = $Error

})

$psCmd.Runspace = $newRunspace
$data = $psCmd.BeginInvoke()

$syncHash.AutoResetEvent.WaitOne()

$syncHash.buttonRefresh.add_Click({
        Write-Host "Click Triggered!" 
       $syncHash.mainWindow.Dispatcher.Invoke([Action] {$syncHash.myDataGrid.ItemsSource = Get-Process },"Normal")
        Write-Host "DataGrid Updated!"
})

注意：

$syncHash.mainWindow.Dispatcher.Invoke([Action] {$syncHash.myDataGrid.ItemsSource = Get-Process },"Normal")

单独工作正常，而不是在点击事件触发时。

Answer 1

保持对更好的解决方案的开放，这是有效的，但我怀疑是过度设计。我通过在click事件中创建一个运行空间来解决这个问题。这将加载动画gif c：\ scripts \ throbber.gif以确认窗口未挂起。 Start-Sleep用于模拟更长时间来获取数据。

$syncHash = [hashtable]::Synchronized(@{})
$syncHash.AutoResetEvent = New-Object System.Threading.AutoResetEvent($false)
$syncHash.AutoResetEventClick = New-Object System.Threading.AutoResetEvent($false)

$newRunspace =[runspacefactory]::CreateRunspace()
$newRunspace.ApartmentState = "STA"
$newRunspace.ThreadOptions = "ReuseThread"         
$newRunspace.Open()
$newRunspace.SessionStateProxy.SetVariable("syncHash",$syncHash)          

$psCmd = [PowerShell]::Create().AddScript({   
[xml]$xaml = @"
<Window 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:wfi="clr-namespace:System.Windows.Forms.Integration;assembly=WindowsFormsIntegration"
        xmlns:winForms="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"

        xmlns:local="clr-namespace:DataTool"
        Name="mainWindow"
        Title="Data Tool" WindowStyle="ToolWindow" SizeToContent="WidthAndHeight" ResizeMode="CanMinimize">

        <Grid Margin="10" Name="mainGrid">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>

        </Grid.RowDefinitions>
        <DataGrid Name="myDataGrid" SelectionUnit="FullRow" IsReadOnly="True" Margin="5" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="5" AutoGenerateColumns="True" Height="200" MaxWidth="900">
        </DataGrid>
        <Button Name="buttonRefresh" Margin="10" Padding="20,5,20,5" Grid.Row="1" Grid.Column="0" HorizontalAlignment="Stretch">Refresh</Button>
    <wfi:WindowsFormsHost Name="wfiThrobber" Grid.Row="3" Grid.Column="0"  Visibility="Visible" VerticalAlignment="Center" HorizontalAlignment="Center" >
                <winForms:PictureBox Name="imgThrobber">
                </winForms:PictureBox>
            </wfi:WindowsFormsHost>
    </Grid>
</Window>
"@

    $reader=(New-Object System.Xml.XmlNodeReader $xaml)
    $syncHash.Window=[Windows.Markup.XamlReader]::Load( $reader )
    $xaml.SelectNodes("//*[@Name]") | %{
        $syncHash[$_.Name] = $syncHash.Window.FindName($_.Name)
    }

    $syncHash.imgThrobber = $syncHash.wfiThrobber.Child[0]
    $syncHash.imgThrobber.Image = [System.Drawing.Image]::FromFile("c:\scripts\throbber.gif");
    $syncHash.AutoResetEvent.Set()
    $syncHash.Window.ShowDialog() | Out-Null


    $syncHash.Error = $Error

})

$psCmd.Runspace = $newRunspace
$data = $psCmd.BeginInvoke()

$syncHash.AutoResetEvent.WaitOne()
$syncHash.buttonRefresh.add_Click({
        $clickRunspace =[runspacefactory]::CreateRunspace()
        $clickRunspace.ApartmentState = "STA"
        $clickRunspace.ThreadOptions = "ReuseThread"         
        $clickRunspace.Open()
        $clickRunspace.SessionStateProxy.SetVariable("syncHash",$syncHash)          
        $psClickCmd = [PowerShell]::Create().AddScript({ 
            Start-Sleep 15
            $items = Get-Process
            $syncHash.Window.Dispatcher.Invoke([Action]{ $syncHash.myDataGrid.ItemsSource = $items })
        })

        $psClickCmd.Runspace = $clickRunSpace
        $psClickCmd.BeginInvoke()

})

从PowerShell中的另一个线程更新WPF DataGrid ItemSource

1 个答案: