Powershell WPF XAML 折叠 RowDefinition 高度或使用事件设置为零

Question

我正在寻找的最终效果是“消失”第“1”行，也就是：从顶部算起的第二行，以便 Text1 向下扩展到该区域，就好像第 1 行不存在一样。

这是我要完成的工作的模型。前 2 行和前列几乎完全相同。

如果我将此 XAML 插入 VS2017 社区并将行高设置为 0，则可以。谷歌搜索了几天后，我没有想出解决方案。

我根本不懂 C#。

平台： Windows 7 // Posh v5

即将推出 Windows 10 // Posh v5

理想情况下，我想先关闭它，然后在活动时打开它。

[void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')
[xml]$XAML = @'
<Window 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="TabularGrid" Height="300" Width="300">
    <Grid Name="Grid">
                <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="80" />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                        <RowDefinition Height="*" />
                        <RowDefinition Height="40" />
                        <RowDefinition Height="30" />
                        <RowDefinition Height="30" />
                </Grid.RowDefinitions>
                <TextBox Name="Text1" Background="Silver" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" >Text1</TextBox>
                <TextBox Name="Text2" Grid.Row="1" Grid.Column="0" >Text2</TextBox>
                <Button Name="Enter" Grid.Row="1" Grid.Column="1" >Enter</Button>
                <Button Name="Open" Grid.Row="2" Grid.ColumnSpan="2" >Open</Button>
                <Button Name="Close" Grid.Row="3" Grid.ColumnSpan="2" >Close</Button>
        </Grid>
</Window>
'@

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

#===========================================================================
# Store Form Objects In PowerShell
#===========================================================================

Function Get-FormVariables{
if ($global:ReadmeDisplay -ne $true){Write-host "If you need to reference this display again, run Get-FormVariables" -ForegroundColor Yellow;$global:ReadmeDisplay=$true}
write-host "Found the following interactable elements from our form" -ForegroundColor Cyan
get-variable WPF*
}

Get-FormVariables


#===========================================================================
# Shows the form
#===========================================================================


$WPFOpen.Add_Click({
$WPFGrid.RowDefinition[1].Visibility = $true
# or 
$WPFGrid.RowDefinition[1].Height="40"
})

$WPFClose.Add_Click({
$WPFGrid.RowDefinition[1].Visibility = $false
# or 
$WPFGrid.RowDefinition[1].Height="0"
})
#>

$Form.ShowDialog() | out-null

感谢您的关注。

Answer 1

那是因为它不是$WPFGrid.RowDefinition，而是$WPFGrid.RowDefinitions，末尾带有s。

我删除了Visibility 方法，因为它没有用RowDefinitions 实现，并由<RowDefinition Height="0" /> 更改<RowDefinition Height="40" /> 以启动不可见行的窗口。

此代码正在运行

[void][System.Reflection.Assembly]::LoadWithPartialName('presentationframework')
[xml]$XAML = @'
<Window 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="TabularGrid" Height="300" Width="300">
    <Grid Name="Grid">
                <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*" />
                        <ColumnDefinition Width="80" />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                        <RowDefinition Height="*" />
                        <RowDefinition Height="0" />
                        <RowDefinition Height="30" />
                        <RowDefinition Height="30" />
                </Grid.RowDefinitions>
                <TextBox Name="Text1" Background="Silver" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" >Text1</TextBox>
                <TextBox Name="Text2" Grid.Row="1" Grid.Column="0" >Text2</TextBox>
                <Button Name="Enter" Grid.Row="1" Grid.Column="1" >Enter</Button>
                <Button Name="Open" Grid.Row="2" Grid.ColumnSpan="2" >Open</Button>
                <Button Name="Close" Grid.Row="3" Grid.ColumnSpan="2" >Close</Button>
        </Grid>
</Window>
'@

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

#===========================================================================
# Store Form Objects In PowerShell
#===========================================================================

Function Get-FormVariables{
if ($global:ReadmeDisplay -ne $true){Write-host "If you need to reference this display again, run Get-FormVariables" -ForegroundColor Yellow;$global:ReadmeDisplay=$true}
write-host "Found the following interactable elements from our form" -ForegroundColor Cyan
get-variable WPF*
}

Get-FormVariables


#===========================================================================
# Shows the form
#===========================================================================


$WPFOpen.Add_Click({
    $WPFGrid.RowDefinitions[1].Height= 40
})

$WPFClose.Add_Click({
    $WPFGrid.RowDefinitions[1].Height= 0
})

$Form.ShowDialog() | out-null