Powershell enum

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Powershell enum

  1. 1. Using enums in Powershell Jason
  2. 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. 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. 4. Possible enum values PS> [Enum]::GetNames( [System.DayOfWeek] ) Sunday Monday Tuesday Wednesday Thursday Friday Saturday
  5. 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. 6. Defining new enum types  Let's look at how to define a brand new enum type within your Powershell script PS> $enumVal = [System.DayOfWeek] 'Sunday' Add-Type -TypeDefinition @" public enum SimpleEnumType { Value1, Value2, Value3 } "@ PS> [SimpleEnumType]::Value1 Value1
  7. 7. Add-Type  The Add-Type cmdlet lets you define a .NET Framework class in your Windows PowerShell session
  8. 8. Add-Type -TypeDefinition PS>$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. 9. Add-Type -path Add-Type -Path C:TempBasicTest.dll Add-Type -Path C:TempBasicTest.cs
  10. 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. 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. 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. 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

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