Read command line switch in C#

Read command line switch in C#

To read command-line switches or arguments in C#, you can use the args parameter of the Main method, which is an array of strings containing the command-line arguments passed to your application. Here's an example of how to read command-line switches:

using System; class Program { static void Main(string[] args) { // Check if a switch is present if (args.Length > 0 && args[0] == "--switch") { // Switch is present, perform corresponding action Console.WriteLine("Switch is enabled"); } else { // Switch is not present, perform default action Console.WriteLine("Switch is not enabled"); } } }

In this example, we check if the args array has at least one element and if that element is "--switch". If the switch is present, we perform the desired action (printing "Switch is enabled" in this case). If the switch is not present or the args array is empty, we perform a default action (printing "Switch is not enabled" in this case).

You can customize the logic based on your specific requirements. You can also handle multiple switches or process the command-line arguments in different ways, such as parsing values associated with switches or validating the command-line input.

When you run your application from the command line, you can pass the desired switch as an argument, like this:

> MyApplication.exe --switch

Note that switches are typically prefixed with dashes or slashes (- or /), but you can define your own conventions based on your application's requirements.

Remember to handle unexpected or invalid command-line inputs appropriately and provide proper error handling or user feedback when necessary.

Examples

  1. "C# read command line switch example"

    • Description: Learn the basics of reading command line switches in a C# console application. Understand how to access command line arguments and process switches.
    // Example code to read command line switch in C# static void Main(string[] args) { foreach (var arg in args) { if (arg.StartsWith("--switch")) { // Process the switch Console.WriteLine("Switch activated!"); } } }

  2. "C# command line parser library"

    • Description: Explore third-party libraries for parsing command line arguments in C#. Find a suitable library that simplifies the process of handling switches and parameters.
    // Example using CommandLineParser library class Options { [Option('s', "switch", Required = false, HelpText = "Activate the switch")] public bool Switch { get; set; } } static void Main(string[] args) { var options = new Options(); Parser.Default.ParseArguments(args, options); if (options.Switch) { // Process the switch Console.WriteLine("Switch activated!"); } }

  3. "C# command line switch with values"

    • Description: Explore how to implement command line switches with values in C#. Learn how to read and use values associated with specific switches.
    // Example code to read command line switch with values static void Main(string[] args) { for (int i = 0; i < args.Length; i++) { if (args[i] == "--config") { string configFilePath = args[i + 1]; // Process the config file path Console.WriteLine($"Config file path: {configFilePath}"); } } }

  4. "C# command line switch case"

    • Description: Understand how to use switch-case statements in C# to handle different command line switches. This helps in organizing and efficiently processing multiple switches.
    // Example code using switch-case for command line switches static void Main(string[] args) { for (int i = 0; i < args.Length; i++) { switch (args[i]) { case "--verbose": Console.WriteLine("Verbose mode activated!"); break; case "--output": string outputDir = args[i + 1]; // Process the output directory Console.WriteLine($"Output directory: {outputDir}"); break; } } }

  5. "C# command line switch validation"

    • Description: Explore methods for validating command line switches in C#. Learn how to ensure that the provided switches meet certain criteria or have required values.
    // Example code for command line switch validation static void Main(string[] args) { if (args.Contains("--input") && args.Contains("--output")) { // Process input and output switches Console.WriteLine("Input and output switches are present!"); } else { // Display usage information Console.WriteLine("Usage: YourApp.exe --input <inputPath> --output <outputPath>"); } }

  6. "C# command line switch with boolean"

    • Description: Learn how to implement boolean switches in C# command line arguments. Understand the process of checking for the presence of a switch without additional values.
    // Example code for boolean command line switch static void Main(string[] args) { if (args.Contains("--force")) { // Process the force switch Console.WriteLine("Force mode activated!"); } }

  7. "C# command line switch help text"

    • Description: Explore techniques for adding help text to your C# command line application. Learn how to display information about available switches and their usage.
    // Example code with help text for command line switches static void Main(string[] args) { if (args.Contains("--help")) { // Display help information Console.WriteLine("Usage: YourApp.exe [--switch1] [--switch2] ..."); Console.WriteLine("--switch1: Description of switch 1"); Console.WriteLine("--switch2: Description of switch 2"); } }

  8. "C# command line switch with default value"

    • Description: Learn how to set default values for command line switches in C#. Understand the process of assigning default values when the user does not provide a specific switch.
    // Example code for command line switch with default value static void Main(string[] args) { string outputPath = args.Contains("--output") ? args[args.IndexOf("--output") + 1] : "defaultOutputPath"; // Process using outputPath Console.WriteLine($"Output path: {outputPath}"); }

  9. "C# command line switch case-insensitive"

    • Description: Explore ways to make command line switches case-insensitive in C#. Learn how to handle switches regardless of whether they are provided in uppercase or lowercase.
    // Example code for case-insensitive command line switches static void Main(string[] args) { if (args.Any(arg => arg.Equals("--verbose", StringComparison.OrdinalIgnoreCase))) { // Process the verbose switch Console.WriteLine("Verbose mode activated!"); } }

  10. "C# command line switch enum"

    • Description: Understand how to use enums with command line switches in C#. Learn how to map command line values to enum types for better code organization.
    // Example code for command line switch with enum enum LogLevel { Info, Warning, Error } static void Main(string[] args) { if (args.Contains("--loglevel")) { LogLevel logLevel; if (Enum.TryParse(args[args.IndexOf("--loglevel") + 1], true, out logLevel)) { // Process using logLevel Console.WriteLine($"Log level: {logLevel}"); } else { Console.WriteLine("Invalid log level specified."); } } }

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