假設我有四個不同部門的串列

音樂
科學
聚乙烯
數學

我可以設定它，以便當您選擇數字時，它將部門存盤為 $department

我想做一個Write-Host所有四個部門的串列，然后$department = Read-Host讓他們從 1-4 中選擇一個數字，它將變數設定為數學等。

任何幫助表示贊賞！

親切的問候

uj5u.com熱心網友回復：

使用列舉 - 讓你開始，沒有像上面那樣的錯誤處理

enum Department
{
    Music = 1
    Science = 2
    PE = 3
    Maths = 4
}

$Departments = [Department]

Write-Host "Please Select"
Write-Host "-------------"
forEach ($departmentName in $Departments.GetEnumNames())
{
    Write-Host "$departmentName = $(($Departments::$departmentName).value__)"
}

$DepartmentNumber = Read-Host "Please Select a Department number"
$Department = [Department]$DepartmentNumber

Write-Host $Department

輸出：

Please Select
-------------
Music = 1
Science = 2
PE = 3
Maths = 4
Please Select a Department: 3
PE

關于列舉的進一步閱讀：https : //docs.microsoft.com/en-us/powershell/module/microsoft.powershell.core/about/about_enum? view = powershell- 7.1

uj5u.com熱心網友回復：

思考程序

這是一個非常教科書的問題。你想要有一個部門陣列，然后用一個與元素索引 1 對應的整數向用戶顯示該陣列。

然后，您從與部門對應的用戶接收整數輸入（進行一些錯誤檢查以確保他們輸入的整數實際上與部門對應），然后使用該整數從部門陣列中獲取適當的陣列元素。由于Read-Host默認情況下input from是一個字串，因此您需要在使用它之前將其轉換$UserInput為 an[int]來獲取陣列的索引。

同樣，由于我們使用陣列索引 1 向用戶列出值，因此在從陣列中檢索陣列元素時必須考慮到這一點，因此我們從用戶獲得的值中減去 1。

代碼

# Our array of departments
$Departments = @(
    "Music",
    "Science",
    "PE",
    "Maths"
)

# List each department for the user to pick from, being sure to off-set it's array index by 1
foreach($Department in $Departments){
    Write-Host "$([array]::IndexOf($Departments, $Department)   1). $Department"
}

# Get the appropriate value that corresponds to a department from the user, retry if user entered invalid value
do {
    $UserInput = Read-Host -Prompt "Enter the number corresponding to the desired department"
} while ($UserInput -le 0 -or $UserInput -gt $Departments.Length)

# Once we have a value from the user, use it to assign get the appropriate department, make sure to offset it by 1
$SelectedDepartment = $Departments[[int]$UserInput - 1]
Write-Host "User selected department: $SelectedDepartment"

示例執行和輸出

1. Music
2. Science
3. PE
4. Maths
Enter the number corresponding to the desired department: 0
Enter the number corresponding to the desired department: 5
Enter the number corresponding to the desired department: 4
User selected department: Maths

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標籤：电源外壳

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