There are several ways to parse command-line arguments in C#, but one of the most commonly used ways is to use the built-in CommandLine
class in the System.CommandLine
namespace, which is available as a NuGet package.
Here's an example of how to use the CommandLine
class to parse command-line arguments:
1. Install the System.CommandLine
package using NuGet:
FTest_Paragraph
Install-Package System.CommandLine
2. Define a root command with the options and arguments you want to parse:
using System.CommandLine; var rootCommand = new RootCommand { new Option<bool>("--verbose", () => false, "Enable verbose output"), new Argument<string>("input-file", "The input file to process") };
In this example, we're defining a root command with a --verbose
option that defaults to false
, and an input-file
argument that takes a string value.
3. Parse the command-line arguments using the CommandLine
class:
using System.CommandLine; using System.CommandLine.Invocation; var parser = new CommandLineBuilder(rootCommand) .UseDefaults() .Build(); parser.Invoke(args);
In this example, we're creating a new CommandLineBuilder
with the rootCommand
we defined earlier, and using the UseDefaults
method to configure the parser to handle common scenarios such as displaying help and version information. Finally, we're invoking the parser with the args
array of strings that contains the command-line arguments.
4. Access the parsed options and arguments:
bool verbose = rootCommand.Parse(args).ValueForOption<bool>("--verbose"); string inputFile = rootCommand.Parse(args).ValueForArgument<string>("input-file");
In this example, we're using the ValueForOption
and ValueForArgument
methods to retrieve the parsed values of the --verbose
option and input-file
argument, respectively.
This is just a basic example, but the CommandLine
class supports a wide range of options and argument types, including subcommands and nested options. You can also define custom types for parsing complex arguments.
"C# command line arguments parsing using CommandLineParser"
// Code: class Options { [Option('i', "input", Required = true, HelpText = "Input file path")] public string InputFilePath { get; set; } // Add more options as needed } class Program { static void Main(string[] args) { Parser.Default.ParseArguments<Options>(args) .WithParsed(options => { // Use parsed options Console.WriteLine($"Input file path: {options.InputFilePath}"); }); } }
Description: This code uses the CommandLineParser library to define and parse command line options easily.
"C# command line arguments parsing using System.CommandLine"
// Code: var rootCommand = new RootCommand { new Option<string>("--input", "Input file path") }; rootCommand.Handler = CommandHandler.Create<string>((input) => { // Use parsed arguments Console.WriteLine($"Input file path: {input}"); }); return await rootCommand.InvokeAsync(args);
Description: This code uses the System.CommandLine library to define and parse command line options.
"C# command line arguments parsing using GetOpt"
// Code: var options = new OptionSet { { "i|input=", "Input file path", input => inputFilePath = input }, // Add more options as needed }; options.Parse(args); // Use parsed arguments
Description: This code uses the GetOpt library to define and parse command line options.
"C# command line arguments parsing with manual parsing"
// Code: string inputFilePath = null; for (int i = 0; i < args.Length; i++) { switch (args[i]) { case "--input": inputFilePath = args[++i]; break; // Handle more options as needed } } // Use parsed arguments
Description: This code manually parses command line arguments without using external libraries.
"C# command line arguments parsing with Microsoft.Extensions.CommandLineUtils"
// Code: var app = new CommandLineApplication(); app.Option("-i|--input <input>", "Input file path", CommandOptionType.SingleValue); app.OnExecute(() => { // Use parsed arguments Console.WriteLine($"Input file path: {app.OptionValues["input"]}"); return 0; }); app.Execute(args);
Description: This code uses Microsoft.Extensions.CommandLineUtils to define and parse command line options.
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// Code: var optionSet = new OptionSet { { "i|input=", "Input file path", input => inputFilePath = input }, // Add more options as needed }; optionSet.Parse(args); // Use parsed arguments
Description: This code uses the NDesk.Options library to define and parse command line options.
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// Code: var doc = new Docopt.Docopt("Usage: yourapp.exe --input=<input>"); var arguments = doc.Parse(args); // Use parsed arguments
Description: This code uses the docopt library for defining and parsing command line options in a docopt style.
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// Code: static void Main(string[] args) { // Use parsed arguments Console.WriteLine($"Input file path: {InputFilePath}"); } // Add this attribute to define command line options [Option("--input", "Input file path")] static string InputFilePath { get; set; }
Description: This code uses the System.CommandLine.DragonFruit library to define and parse command line options using attributes.
"C# command line arguments parsing with McMaster.Extensions.CommandLineUtils"
// Code: [Command(Name = "yourapp")] [Option("--input", "Input file path")] class Program { static void Main(string[] args) => CommandLineApplication.Execute<Program>(args); void OnExecute() { // Use parsed arguments Console.WriteLine($"Input file path: {InputFilePath}"); } }
Description: This code uses McMaster.Extensions.CommandLineUtils to define and parse command line options.
"C# command line arguments parsing with System.CommandLine.Invocation"
// Code: var command = new Command("yourapp") { new Option<string>("--input", "Input file path") }; command.Handler = CommandHandler.Create<string>((input) => { // Use parsed arguments Console.WriteLine($"Input file path: {input}"); }); return command.InvokeAsync(args);
Description: This code uses System.CommandLine.Invocation to define and parse command line options.
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