检查电脑的 .net framework 的版本（复制到powershell里执行）

打开 powershell，

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$release = Get-ItemPropertyValue -LiteralPath 'HKLM:SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full' -Name Release switch ($release) {     { $_ -ge 533320 } { $version = '4.8.1 or later'; break }     { $_ -ge 528040 } { $version = '4.8'; break }     { $_ -ge 461808 } { $version = '4.7.2'; break }     { $_ -ge 461308 } { $version = '4.7.1'; break }     { $_ -ge 460798 } { $version = '4.7'; break }     { $_ -ge 394802 } { $version = '4.6.2'; break }     { $_ -ge 394254 } { $version = '4.6.1'; break }     { $_ -ge 393295 } { $version = '4.6'; break }     { $_ -ge 379893 } { $version = '4.5.2'; break }     { $_ -ge 378675 } { $version = '4.5.1'; break }     { $_ -ge 378389 } { $version = '4.5'; break }     default { $version = $null; break } }   if ($version) {     Write-Host -Object ".NET Framework Version: $version" } else {     Write-Host -Object '.NET Framework Version 4.5 or later is not detected.' }

　　

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