Working with variables To create a new variable, use an assignment statement to assign a value to the variable. You don't have to declare the variable before using it. The default value of all …

$PSItem was added to PowerShell in an attempt to provide a clearer meaning to the variable name. However, in practice, the dollar sign underscore form $_ is most commonly used.

2025年11月18日 · The value can be a constant or an expression, but it must either match the variable declaration type or be implicitly convertible to that type. For more information, see …

The New-Variable cmdlet creates a new variable in PowerShell. You can assign a value to the variable while creating it or assign or change the value after it is created.

2025年11月25日 · In Copilot Studio, you can use the Variables panel to see information about an environment variable. The Variable properties panel also has a link to Power Apps, the …

2025年11月18日 · The scope of a variable is the range of Transact-SQL statements that can reference the variable. The scope of a variable lasts from the point it's declared until the end of …

When you use a variable in a template that isn't marked as available in templates, the variable doesn't render. The variable doesn't render because its value isn't accessible within the …

2025年10月27日 · User-defined variables can be set as read-only. There are naming restrictions for variables (example: you can't use secret at the start of a variable name). You can use a …

2024年3月22日 · Use the Set function to set the value of a global variable, which temporarily holds a piece of information, such as the number of times the user has selected a button or the …

2025年8月27日 · Any environment variable you add or change in your PowerShell profile is available in any session that loads your profile. This method works for any version of …