powershell-windows

原文涵盖的主题

• PowerShell Windows Patterns
• 1. Operator Syntax Rules
• CRITICAL: Parentheses Required
• 2. Unicode/Emoji Restriction
• CRITICAL: No Unicode in Scripts
• 3. Null Check Patterns
• Always Check Before Access
• 4. String Interpolation

Critical patterns and pitfalls for Windows PowerShell. -- | ❌ Wrong | ✅ Correct | |----------|-----------| | if (Test-Path "a" -or Test-Path "b") | if ((Test-Path "a") -or (Test-Path "b")) | | if (Get-Item $x -and $y -eq 5) | if ((Get-Item $x) -and ($y -eq 5)) | Rule: Each cmdlet call MUST be in parentheses when using logical operators. -- | Purpose | ❌ Don't Use | ✅ Use | |---------|-------------|--------| | Success | ✅ ✓ | [OK] [+] | | Error | ❌ ✗ 🔴 | [!] [X] | | Warning | ⚠️ 🟡 | [] [WARN] | | Info | ℹ️ 🔵 | [i] [INFO] | | Progress | ⏳ | [...] | Rule: Use ASCII characters only in PowerShell scripts. -- | ❌ Wrong | ✅ Correct | |----------|-----------| | $array.Count -gt 0 | $array -and $array.Count -gt 0 | | $text.Length | if ($text) { $text.Length } | -- | ❌ Wrong | ✅ Correct | |----------|-----------| | "Value: $($obj.prop.sub)" | Store in variable first | Pattern: -- | Value | Use | |-------|-----| | Stop | Development (fail fast) | | Continue | Production scripts | | SilentlyContinue | When errors expected | Don't return inside try block Use finally for cleanup Return after try/catch -- | Pattern | Use | |---------|-----| | Literal path | C:\Users\User\file.txt | | Variable

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