PowerShell哈希表实战指南

哈希表基础操作

# 创建基础哈希表
$userProfile = @{
    Name = '张三'
    Department = 'IT'
    LastLogin = (Get-Date).AddDays(-3)
}

# 属性访问的三种方式
Write-Host $userProfile['Name']
Write-Host $userProfile.Name
Write-Host $userProfile.Item('Department')

动态操作技巧

# 条件性添加属性
if (-not $userProfile.ContainsKey('Office')) {
    $userProfile.Add('Office', 'Room 501')
}

# 带类型约束的哈希表
[ordered][System.Collections.Hashtable]$configTable = @{
    LogLevel = 'Debug'
    MaxRetry = 3
}

实际应用场景

# 配置文件转换示例
$rawConfig = Get-Content appsettings.json | ConvertFrom-Json
$configTable = @{
    Environment = $rawConfig.Env
    Features = $rawConfig.Features -join ';'
    Timeout = [timespan]::FromMinutes($rawConfig.WaitTime)
}

# 快速对象比较
$diff = Compare-Object $oldTable.GetEnumerator() $newTable.GetEnumerator() -Property Name,Value