SwitchParameter

I was curious how one can create his own cmdlet, with parameters which do not take values.

For example, when a Cmdlet runs, we can specify -Verbose. This parameter does not take a value, it simply exists.

We do this by creating a parameter like this.

    private SwitchParameter hasHeader;

    [Parameter(Position = 1,

    Mandatory = false,

    ValueFromPipelineByPropertyName = true,

    HelpMessage = "Whether first row is a header"),

    ValidateNotNullOrEmpty()]

    public SwitchParameter HasHeader { 

              get { return hasHeader; } 

              set { hasHeader = value; }

      }

And then we check for it like this:

if (HasHeader.IsPresent){ };

It is important to note that the default value is false.

http://msdn.microsoft.com/en-us/library/windows/desktop/system.management.automation.switchparameter(v=vs.85).aspx