我尝试在PowerShell中使用XAML并遇到一个奇怪的问题。如果我在下面的一行中写下$inputXML = @"
<Window x:Class="WpfApplication2.MainWindow"
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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApplication2" mc:Ignorable="d"
Title="test" Height="416.794" Width="598.474" Topmost="True">
<Grid Margin="0,0,45,0">
<Image x:Name="image" HorizontalAlignment="Left" Height="100" Margin="24,28,0,0" VerticalAlignment="Top" Width="100" Source="C:\Users\Stephen\Dropbox\Docs\blog\foxdeploy favicon.png"/>
<TextBlock x:Name="textBlock" HorizontalAlignment="Left" Height="100" Margin="174,28,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="282" FontSize="16"><Run Text="Use this tool to find disk information"/><InlineUIContainer>
<TextBlock x:Name="textBlock1" TextWrapping="Wrap" Text="TextBlock"/>
</InlineUIContainer></TextBlock>
<Button x:Name="button" Content="get-DiskInfo" HorizontalAlignment="Left" Height="35" Margin="393,144,0,0" VerticalAlignment="Top" Width="121" FontSize="18.667"/>
<TextBox x:Name="textBox" HorizontalAlignment="Left" Height="35" Margin="186,144,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="168" FontSize="16"/>
<Label x:Name="label" Content="ComputerName" HorizontalAlignment="Left" Height="46" Margin="24,144,0,0" VerticalAlignment="Top" Width="138" FontSize="16"/>
<ListView x:Name="listView" HorizontalAlignment="Left" Height="156" Margin="24,195,0,0" VerticalAlignment="Top" Width="511" FontSize="16">
<ListView.View>
<GridView>
<GridViewColumn Header="Drive Letter" DisplayMemberBinding ="{Binding 'Drive Letter'}" Width="120"/>
<GridViewColumn Header="Drive Label" DisplayMemberBinding ="{Binding 'Drive Label'}" Width="120"/>
<GridViewColumn Header="Size(MB)" DisplayMemberBinding ="{Binding Size(MB)}" Width="120"/>
<GridViewColumn Header="FreeSpace%" DisplayMemberBinding ="{Binding FreeSpace%}" Width="120"/>
</GridView>
</ListView.View>
</ListView>
</Grid>
</Window>
"@
行
$inputXML = @"
...
"@
$inputXML = $inputXML -replace 'mc:Ignorable="d"','' -replace "x:N",'N' -replace '^<Win.*', '<Window'
[void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')
[xml]$XAML = $inputXML
#Read XAML
$reader = (New-Object System.Xml.XmlNodeReader $xaml)
try{$Form=[Windows.Markup.XamlReader]::Load( $reader )}
catch{Write-Warning "Unable to parse XML, with error: $($Error[0])`n Ensure that there are NO SelectionChanged properties (PowerShell cannot process them)"
throw}
它会抛出错误
Exception calling "Load" with "1" argument(s): "Cannot create unknown type 'Window'." At line:36 char:5 + try{$Form=[Windows.Markup.XamlReader]::Load( $reader )} + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], ParentContainsErrorRecordException + FullyQualifiedErrorId : XamlParseException
如果我将它们中的每一个写成如下所示,它可以正常工作。这是批次处理吗?
apply_async
我从a blog获取代码以测试兼容性:
AsyncResult
答案 0 :(得分:1)
您使用的代码已损坏。撰写该博客帖子的人显然忽略了实际测试他们发布的内容,因为该代码应该抛出您观察到的相同错误。声明
$inputXML = $inputXML ... -replace '^<Win.*', '<Window'
将更改行
<Window x:Class="WpfApplication2.MainWindow" ... Topmost="True">
到
<Window
没有关闭角括号,因此使XML无效。
您的第二个XML示例不会受到影响,因为其<Window>
标记包含在多行中,因此结束角括号位于不同的行上,因此不会受到替换操作的影响。
<Window x:Class="WpfApplication2.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
...
Title="test" Height="416.794" Width="598.474" Topmost="True">
变成
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
...
Title="test" Height="416.794" Width="598.474" Topmost="True">
仍然是有效的XML。
将模式<Win.*
调整为更具体的问题,问题将消失。假设您要从代码中删除x:Class
属性(因为将<Window
替换为<Window
并不是很有意义),您可以执行以下操作:
$inputXML = $inputXML ... -replace '(?<=<Window) x:Class=".*?"',''
顺便说一句,这是一个很好的例子,说明为什么你不应该首先使用字符串操作来操作XML(related)。一个明显更好的问题解决方案(同样,假设您要从x:Class
节点中删除<Window>
属性)将删除之后的 XML解析器提供的属性使用适当的工具:
$inputXML = @"
...
"@
[void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')
[xml]$XAML = $inputXML
$XAML.Window.RemoveAttribute('x:Class')