如何在PowerShell上将变量中的内容与哈希表进行比较

Question

我有一个如下的哈希表：

$ProjectType = @{
CSharp = 'FAE04EC0-301F-11D3-BF4B-00C04F79EFBC'
Web_Application  = '349C5851-65DF-11DA-9384-00065B846F21'
Windows_Communication_Foundation = '3D9AD99F-2412-4246-B90B-4EAA41C64699'
Windows_Presentation_Foundation = '60DC8134-EBA5-43B8-BCC9-BB4BC16C2548'
Test = '3AC096D0-A1C2-E12C-1390-A8335801FDAB'
Silverlight = 'A1591282-1198-4647-A2B1-27E5FF5F6F3B'
}

我想对变量$file中的内容运行哈希表，如果在$file中找到值(guid(，则从哈希表中返回项目类型名称。

Answer 1

您很可能希望颠倒哈希表上键和值的顺序：

$ProjectType = @{
'FAE04EC0-301F-11D3-BF4B-00C04F79EFBC' = 'CSharp'
'349C5851-65DF-11DA-9384-00065B846F21' = 'Web_Application'
'3D9AD99F-2412-4246-B90B-4EAA41C64699' = 'Windows_Communication_Foundation'
'60DC8134-EBA5-43B8-BCC9-BB4BC16C2548' = 'Windows_Presentation_Foundation'
'3AC096D0-A1C2-E12C-1390-A8335801FDAB' = 'Test'
'A1591282-1198-4647-A2B1-27E5FF5F6F3B' = 'Silverlight'
}
# using this as example
$exampleFile = @'
349C5851-65DF-11DA-9384-00065B846F21
60DC8134-EBA5-43B8-BCC9-BB4BC16C2548
A1591282-1198-4647-A2B1-27E5FF5F6F3B
00000000-1198-4647-A2B1-27E5FF5F6F3B
'@ -split 'r?n'
foreach($line in $exampleFile)
{
if($val = $ProjectType[$line])
{
"$line => $val"
continue
}
"$line => could not be found on reference table."
}

Answer 2

翻转键和值，使引用GUID成为键：

$ProjectType = @{
'FAE04EC0-301F-11D3-BF4B-00C04F79EFBC' = 'CSharp'
'349C5851-65DF-11DA-9384-00065B846F21' = 'Web_Application'
'3D9AD99F-2412-4246-B90B-4EAA41C64699' = 'Windows_Communication_Foundation'
'60DC8134-EBA5-43B8-BCC9-BB4BC16C2548' = 'Windows_Presentation_Foundation'
'3AC096D0-A1C2-E12C-1390-A8335801FDAB' = 'Test'
'A1591282-1198-4647-A2B1-27E5FF5F6F3B' = 'Silverlight'
}

现在你可以很容易地查找任何值：

$file = '3AC096D0-A1C2-E12C-1390-A8335801FDAB'
if($ProjectType.ContainsKey($file)){
Write-Host "Found project type guid for '$($ProjectType[$file])'"
}