7 The Help Attributes
Craig Oates edited this page 4 years ago

To use the "Help Section" feature, you will need to know about the four attributes it is built with. They are as follows,

  • ListCommand: When you attach this attribute to a command-method, that method will appear in the help section at run-time. You can, also, pass in false, as a parameter. This explicit declaration means the method will not appear at run-time. I use this option to turn things on an off without needing to rewrite the whole line every time. It helps with reducing temporary comment code, as well.
  • Parameters: You can use this attribute to list out the parameters the end-user will need to pass into the command-method. The reason why you need to pass in a string to the attributes constructor is so you have flexibility. Some methods have parameter lists which are large and difficult to read. Because of this, it is in your end-user's interest for you to simplify it. I admit I could have programmed Console.Waterworks to figure it out for you. But, that would have taken that decision away from you. Whilst it is not perfect, I believe the string approach is the most practical solution.
  • Describe: This attribute allows you to offer contextual information to the end-user. To use it, you pass in a string to the attribute's constructor.
  • Usage: To help your end-users even more, you can provide them with an example of how to use your command-methods. To use this attribute, pass in a string to its constructor.

To you get a sense of how they look in practice, please use the links below:

You will only see these attributes decorating command-methods found in each project's "ConsoleCommands.cs" file (or ConsoleCommands.fs" file if you're using F#).

// Copy and paste this in to ConsoleCommands file to speed up the typing.
[ListCommand()] // Passing in no parameters defaults to true.
[Description("")]
[Parameters("")]
[Usage("> ")]