Script blocks are dynamic by default, so variables in a script block will be evaluated each time the script block runs.
By turning a script block in a "closure", it keeps the state of the variables. Here is an example:
PS> $var = 'A' PS> $scriptblock = { $var } PS> & $scriptblock A PS> $var = 'B' PS> & $scriptblock B PS> PS> $var = 'D' PS> $closure = $scriptblock.GetNewClosure() PS> $var = 'E' PS> & $closure D PS> $var = 'F' PS> & $closure D
Note that the closure script block will always return "D" because that was the value of $var when the closure was created.
