Command Line - bool argument doesn't work

Question

I am trying to use bool argument in my console application. I'm using the CommandLineParser Package, but parser return error.

this is my option

    [Option("randomize", Required = false, DefaultValue = false, HelpText = "Enter \"true\" for the random selection")]
    public bool Randomize { get; set; }

argument: --randomize=true

I am using Parser.Default.ParseArguments

Any idea why this doesn't work?

This is not standard C#. I guess you are using a library for this? Please post a [mcve]. — nvoigt, Feb 02 '17 at 09:01
So you *do* use a library. That's not a bad thing, but you need to mention it. And we still need a [mcve]. — nvoigt, Feb 02 '17 at 09:04
I don't see any sample in the documentation that would suggest to write `--randomize=true` - all I found used something along the lines of `--randomize` to set the boolean value to true. — UnholySheep, Feb 02 '17 at 09:25

Matt Hogan-Jones · Answer 1 · 2017-02-02T09:31:34.313

4

You don't need to add true or false as the argument value - CommandLineParser will just set the value to true if the argument is present.

So this will pass in a value of true:

--randomize

So if your application is called ParserApp the following passes true

ParserApp --randomize

While the below line will pass false

ParserApp

The Quick Start guide has an example for the usage of a boolean parameter.

edited Feb 02 '17 at 09:31

answered Feb 02 '17 at 09:26

Matt Hogan-Jones

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So it looks like setting `DefaultValue = true` in the `Option` attribute for a `bool` option would make it such that the option could never be set to `false` when executing? Since `--randomize=false` can't be parsed, as mentioned. – Michael Hornfeck Jun 27 '19 at 13:59

Command Line - bool argument doesn't work

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