Parse command line arguments/options in C#

问题

I have a console application with some arguments and options so I would like to use a free third-party library.

I have found two libraries for this purpose: NDesk.Options and Command Line Parser Library

Finally I have decided to use Command Line Parser Library because it is clearer using properties so I have downloaded it and added a reference to it.

The problem is that when adding the reference to my .NET Framework 3.5 project I get a warning icon. From the above page where I have downloaded it, it says that compatibility is .NET Framework 3.5+ so I understand 3.5 is compatible, am I right? If not which previous version of it is compatible with .NET Framework 3.5?

回答1:

You can also use the new Microsoft CommandLineUtils library. The nuget package is here, but only for .NET Core or Framrwork 4.5.2. But you can download the source code (only 7 files) and include in your projet. For the Framework 3.5, you have only 2 compilation errors to solve: remove an extra method (using Tasks) and remove one line (in HandleUnexpectedArg).

Nuget: https://www.nuget.org/packages/Microsoft.Extensions.CommandLineUtils
Source: https://github.com/aspnet/Common/tree/dev/shared/Microsoft.Extensions.CommandLineUtils.Sources

To use this library, find here a first sample:

static void Main(string[] args)
{
    var cmd = new CommandLineApplication();
    var argAdd = cmd.Option("-a | --add <value>", "Add a new item", CommandOptionType.SingleValue);

    cmd.OnExecute(() =>
    {
        Console.WriteLine(argAdd.Value());
        return 0;
    });

    cmd.HelpOption("-? | -h | --help");
    cmd.Execute(args);            
}

回答2:

I recommend FluentArgs (see: https://github.com/kutoga/FluentArgs). I think it is very easy to use:

namespace Example
{
    using System;
    using System.Threading.Tasks;
    using FluentArgs;

    public static class Program
    {
        public static Task Main(string[] args)
        {
            return FluentArgsBuilder.New()
                .DefaultConfigsWithAppDescription("An app to convert png files to jpg files.")
                .Parameter("-i", "--input")
                    .WithDescription("Input png file")
                    .WithExamples("input.png")
                    .IsRequired()
                .Parameter("-o", "--output")
                    .WithDescription("Output jpg file")
                    .WithExamples("output.jpg")
                    .IsRequired()
                .Parameter<ushort>("-q", "--quality")
                    .WithDescription("Quality of the conversion")
                    .WithValidation(n => n >= 0 && n <= 100)
                    .IsOptionalWithDefault(50)
                .Call(quality => outputFile => inputFile =>
                {
                    /* ... */
                    Console.WriteLine($"Convert {inputFile} to {outputFile} with quality {quality}...");
                    /* ... */
                    return Task.CompletedTask;
                })
                .ParseAsync(args);
        }
    }
}

There are many other examples on the github page.

来源：https://stackoverflow.com/questions/43232740/parse-command-line-arguments-options-in-c-sharp

标签

parsing

command-line-parser

qcommandlineparser