Mastering Windows PowerShell Scripting - Third Edition

The flags attribute

By default, an enumeration matches a single value. If the enumeration contains more than one name for a value, the first name will be chosen.

The flags attribute allows a value to describe more than one name. The flags attribute is placed before the enum keyword.

Typically, each value in the enumeration is given a value with a unique bit combination. This is shown in the following enumeration; the bit combination is shown in the comment after the value:

[Flags()]enum MyEnum {    First  = 1 # 001    Second = 2 # 010    Third  = 4 # 100}

Automatic value assignment cannot be reasonably used to assign values for a flags enumeration at the time of writing.

When the flags attribute is present, PowerShell will cast a string that contains ...