UseLiteralInitializerForHashtable

Severity Level: Warning

Default state: Always enabled

Description

This rule detects hashtables created using the [hashtable]::new() method or the New-Object -TypeName hashtable cmdlet without passing an IEqualityComparer object. When you create a hashtable using [hashtable]::new() or New-Object -TypeName hashtable, the keys are looked up in a case-sensitive manner by default.

However, PowerShell is case-insensitive in nature, and hashtables should maintain this behavior. To ensure consistent case-insensitive key lookup, use literal hashtable expressions instead.

Example

Noncompliant

$hashtable = [hashtable]::new()

Compliant

$hashtable = @{}

Configure rule

This rule is always enabled and isn't configurable. Use one of the following methods to avoid using this rule:

• Create a custom rule configuration file to include only the rules you want or exclude the rules you don't want.
• Add the appropriate rule suppression attributes to your code to suppress the rule for specific code blocks. For more information, see the Suppressing rules section of Using PSScriptAnalyzer.