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How to Declare Parameter Sets

 

This example shows how to define two parameter sets when you declare the parameters for a cmdlet. Each parameter set has both a unique parameter and a shared parameter that is used by both parameter sets. For more information about parameters sets, including how to specify the default parameter set, see Cmdlet Parameter Sets.

System_CAPS_importantImportant

Whenever possible, define the unique parameter of a parameter set as a required parameter. However, if you want your cmdlet to run without specifying any parameters, the unique parameter can be an optional parameter. For example, the unique parameter of the Get-Command cmdlet is optional.

How to Define Two Parameter Sets

  1. Add the ParameterSet keyword to the Parameter attribute for the unique parameter of the first parameter set.

    [Parameter(Position = 0, Mandatory = true, 
               ParameterSetName = "Test01")]
    public string UserName
    {
      get { return userName; }
      set { userName = value; }
    }
    private string userName;
    
  2. Add the ParameterSet keyword to the Parameter attribute for the unique parameter of the second parameter set.

    [Parameter(Position = 0, Mandatory = true, 
               ParameterSetName = "Test02")]
    public string ComputerName
    {
      get { return computerName; }
      set { computerName = value; }
    }
    private string computerName;
    
  3. For the parameter that belongs to both parameter sets, add a Parameter attribute for each parameter set and then add the ParameterSet keyword to each set. In each Parameter attribute, you can specify how that parameter is defined. A parameter can be optional in one set and mandatory in another.

    [Parameter(Mandatory= true, ParameterSetName = "Test01")]
    [Parameter(ParameterSetName = "Test02")]
    public string SharedParam
    {
        get { return sharedParam; }
        set { sharedParam = value; }
    }
    private string sharedParam;
    

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