1. Using enums in Powershell
Jason

2. Enum
 Enums are a very useful way to encode "options" in .NET programming.
 They offer a mechanism to represent a fixed set of known values, named in
a developer-friendly way.

3. Using enums in Powershell
 Let's start examining this support by looking at the DayOfWeek enum.
PS> $now = Get-Date
PS> $now.DayOfWeek
Thursday
PS> $now | Get-Member DayOfWeek
TypeName: System.DateTime
Name MemberType Definition
---- ---------- ----------
DayOfWeek Property System.DayOfWeek DayOfWeek {get;}

4. Possible enum values
PS> [Enum]::GetNames( [System.DayOfWeek] )
Sunday
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday

5. Creating enum instances
 The most direct way is to use the same "::" syntax used when accessing
static .NET
 Another option is to cast a string containing a valid enum name into the
enum type:
PS> $enumVal = [System.DayOfWeek]::Monday
PS> $enumVal = [System.DayOfWeek]::Sunday
PS> $enumVal = [System.DayOfWeek] 'Sunday'

6. Defining new enum types
 Let's look at how to define a brand new enum type within your Powershell
script
PS> $enumVal = [System.DayOfWeek] 'Sunday'
Add-Type -TypeDefinition @"
public enum SimpleEnumType
{
Value1,
Value2,
Value3
}
"@
PS> [SimpleEnumType]::Value1
Value1

7. Add-Type
 The Add-Type cmdlet lets you define a .NET Framework class in your
Windows PowerShell session

8. Add-Type -TypeDefinition
PS>$source = @"
public class BasicTest
{
public static int Add(int a, int b)
{
return (a + b);
}
public int Multiply(int a, int b)
{
return (a * b);
}
}
"@
C:PS> Add-Type -TypeDefinition $source

9. Add-Type -path
Add-Type -Path C:TempBasicTest.dll
Add-Type -Path C:TempBasicTest.cs

10. Defining new enum types
 If you don't give enum names explicit values, they will be automatically
numbered starting from 0.
PS> [SimpleEnumType]::Value1 -as [int]
0
PS> [SimpleEnumType]::Value2 -as [int]
1
PS> [SimpleEnumType]::Value3 -as [int]
2

11. Defining new enum types
 You can also define specific integer values for each enum value
Add-Type -TypeDefinition @"
public enum ExplicitEnumType
{
None = 0,
Value1 = 1,
Value2 = 10,
Value3 = 100
}
"@
PS> [ExplicitEnumType]::Value2 -as [int]
10

12. Defining new enum types
 If you want to provide explicit support for bitwise combinations of values
Add-Type -TypeDefinition @“
[System.Flags]
public enum FlagsEnumType
{
None = 0,
Value1 = 1,
Value2 = 2,
Value3 = 4
}
"@
PS> [FlagsEnumType] "Value1, Value3"
Value1, Value3

13. Reference
 Using enums in Powershell
 http://latkin.org/blog/2012/07/08/using-enums-in-powershell/
 MSND Add-Type
 http://technet.microsoft.com/en-us/library/hh849914.aspx