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May 9, 2020 15:32
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System.CommandLine ConfigureFromClass example
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| #r "nuget: System.CommandLine, 2.0.0-beta1.20253.1" | |
| //https://discoverdot.net/projects/dotnet-script | |
| using System; | |
| using System.CommandLine; | |
| using System.CommandLine.Binding; | |
| using System.CommandLine.Invocation; | |
| using System.ComponentModel; | |
| using System.ComponentModel.DataAnnotations; | |
| using System.Linq; | |
| using System.Reflection; | |
| //var args = Args.ToArray(); | |
| var args = new string[] { | |
| "-Name", "Paul", | |
| "-Message", "Hello {0}!", | |
| }; | |
| var command = new RootCommand(); | |
| ConfigureFromClass<Hello>(command, hello => | |
| { | |
| Console.WriteLine(hello.Speak()); | |
| }); | |
| command.Invoke(args); | |
| [Description("Say Hello")] | |
| class Hello | |
| { | |
| [Description("Someone's name")] | |
| public string Name { get; set; } | |
| [Description("A simple message"), Required] | |
| public string Message { get; set; } | |
| public string Speak() | |
| { | |
| return string.Format(Message, Name); | |
| } | |
| }; | |
| private static void ConfigureFromClass<T>(Command command, Action<T> execute) where T : new() | |
| { | |
| var commandType = typeof(T); | |
| command.Description = commandType | |
| .GetCustomAttributes() | |
| .OfType<DescriptionAttribute>() | |
| .FirstOrDefault() | |
| ?.Description; | |
| var props = commandType.GetProperties(); | |
| foreach (var prop in props) | |
| { | |
| var description = GetAttribute<DescriptionAttribute>(prop)?.Description; | |
| var required = GetAttribute<RequiredAttribute>(prop) != null; | |
| var option = new Option($"-{prop.Name}", description) | |
| { | |
| Required = required, | |
| }; | |
| option.Argument = new Argument | |
| { | |
| ArgumentType = prop.PropertyType, | |
| }; | |
| command.AddOption(option); | |
| } | |
| command.Handler = CommandHandler.Create((InvocationContext context) => | |
| { | |
| var modelBinder = new ModelBinder<T>(); | |
| var cmd = new T(); | |
| modelBinder.UpdateInstance(cmd, context.BindingContext); | |
| execute(cmd); | |
| }); | |
| } | |
| private static T GetAttribute<T>(PropertyInfo prop) | |
| { | |
| return prop | |
| .GetCustomAttributes() | |
| .OfType<T>() | |
| .FirstOrDefault(); | |
| } |
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