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Argument Collections#

With CommandDotNet, you can define a single Operand collection and many Option collections.

Let's enhance our rocket launcher to visit multiple planets and specify a crew.

public void LaunchRocket(
    IEnumerable<string> planets, 
    [Option(ShortName = "c", LongName = "crew")] string[] crew)

Help looks like...

$ dotnet example.dll LaunchRocket -h
Usage: dotnet example.dll LaunchRocket [options] [arguments]


  planets (Multiple)  <TEXT>


  -c (Multiple)  <TEXT>

And this is how you call it

dotnet example.dll LaunchRocket mars earth jupiter -c aaron -c alex

and since options are not positional, they can be intermixed with operands.

dotnet example.dll LaunchRocket mars -c aaron earth -c alex jupiter

launching rocket
planets: mars,earch,jupiter
crew: aaron,alex

Operand Collections#

Only one collection is supported because it is not possible to determine which collection an operand belonged to if there were many.

Operand collections must the be the last operand specified.

Option Collections#

Since options are named, you can have multiple option collections. Specify the option name for each entry as shown in the example above.


CommandDotNet provides middleware to pipe input to operand collections.

If your parameter type is IEnumerable<T>, the operands will be streamed into the command.


See prompting for missing arguments to see how prompting for collections works.

Replace the default prompter to provide a different experience.