Class CommandLineApplication

Describes a set of command line arguments, options, and execution behavior. CommandLineApplication can be nested to support subcommands.

Inheritance
System.Object
CommandLineApplication
CommandLineApplication<TModel>
Implements
System.IServiceProvider
System.IDisposable
Namespace: McMaster.Extensions.CommandLineUtils
Assembly: McMaster.Extensions.CommandLineUtils.dll
Syntax
public class CommandLineApplication : IServiceProvider, IDisposable

Constructors

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CommandLineApplication(IHelpTextGenerator, IConsole, String, Boolean)

Initializes a new instance of CommandLineApplication.

Declaration
public CommandLineApplication(IHelpTextGenerator helpTextGenerator, IConsole console, string workingDirectory, bool throwOnUnexpectedArg)
Parameters
Type Name Description
IHelpTextGenerator helpTextGenerator

The help text generator to use.
IConsole console

The console implementation to use.
System.String workingDirectory

The current working directory.
System.Boolean throwOnUnexpectedArg

Initial value for ThrowOnUnexpectedArgument.
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CommandLineApplication(IConsole)

Initializes a new instance of CommandLineApplication.

Declaration
public CommandLineApplication(IConsole console)
Parameters
Type Name Description
IConsole console

The console implementation to use.
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CommandLineApplication(IConsole, String, Boolean)

Initializes a new instance of CommandLineApplication.

Declaration
public CommandLineApplication(IConsole console, string workingDirectory, bool throwOnUnexpectedArg)
Parameters
Type Name Description
IConsole console

The console implementation to use.
System.String workingDirectory

The current working directory.
System.Boolean throwOnUnexpectedArg

Initial value for ThrowOnUnexpectedArgument.
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CommandLineApplication(Boolean)

Initializes a new instance of CommandLineApplication.

Declaration
public CommandLineApplication(bool throwOnUnexpectedArg = true)
Parameters
Type Name Description
System.Boolean throwOnUnexpectedArg

Initial value for ThrowOnUnexpectedArgument.

Properties

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AllowArgumentSeparator

Determines if '--' can be used to separate known arguments and options from additional content passed to RemainingArguments.

Declaration
public bool AllowArgumentSeparator { get; set; }
Property Value
Type Description
System.Boolean
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Arguments

Required command-line arguments.

Declaration
public List<CommandArgument> Arguments { get; }
Property Value
Type Description
System.Collections.Generic.List<CommandArgument>
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ClusterOptions

One or more options of NoValue, followed by at most one option that takes values, should be accepted when grouped behind one '-' delimiter.

When true, the following are equivalent. 

-abcXyellow
-abcX=yellow
-abcX:yellow
-abc -X=yellow
-ab -cX=yellow
-a -b -c -Xyellow
-a -b -c -X yellow
-a -b -c -X=yellow
-a -b -c -X:yellow

This defaults to true unless an option with a short name of two or more characters is added.

Declaration
public bool ClusterOptions { get; set; }
Property Value
Type Description
System.Boolean
Remarks

https://www.gnu.org/software/libc/manual/html_node/Argument-Syntax.html

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Commands

Subcommands.

Declaration
public List<CommandLineApplication> Commands { get; }
Property Value
Type Description
System.Collections.Generic.List<CommandLineApplication>
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Conventions

Gets a builder that can be used to apply conventions to

Declaration
public IConventionBuilder Conventions { get; }
Property Value
Type Description
IConventionBuilder
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Description

A description of the command.

Declaration
public string Description { get; set; }
Property Value
Type Description
System.String
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Error

The writer used to display generated error messages.

Declaration
public TextWriter Error { get; set; }
Property Value
Type Description
System.IO.TextWriter
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ExtendedHelpText

Additional text that appears at the bottom of generated help text.

Declaration
public string ExtendedHelpText { get; set; }
Property Value
Type Description
System.String
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FullName

The full name of the command to show in the help text.

Declaration
public string FullName { get; set; }
Property Value
Type Description
System.String
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HelpTextGenerator

The help text generator to use.

Declaration
public IHelpTextGenerator HelpTextGenerator { get; set; }
Property Value
Type Description
IHelpTextGenerator
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IsShowingInformation

True when OptionHelp or OptionVersion was matched.

Declaration
public bool IsShowingInformation { get; protected set; }
Property Value
Type Description
System.Boolean
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LongVersionGetter

The long-form of the version to display in generated help text.

Declaration
public Func<string> LongVersionGetter { get; set; }
Property Value
Type Description
System.Func<System.String>
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MakeSuggestionsInErrorMessage

When an invalid argument is given, make suggestions in the error message about similar, valid commands or options.

$ git pshu Specify --help for a list of available options and commands Unrecognized command or argument 'pshu'

Did you mean this? push

Declaration
public bool MakeSuggestionsInErrorMessage { get; set; }
Property Value
Type Description
System.Boolean
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Name

The short name of the command. When this is a subcommand, it is the name of the word used to invoke the subcommand.

Declaration
public string Name { get; set; }
Property Value
Type Description
System.String
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Names

All names by which the command can be referenced. This includes Name and an aliases added in AddName(String).

Declaration
public IEnumerable<string> Names { get; }
Property Value
Type Description
System.Collections.Generic.IEnumerable<System.String>
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OptionHelp

The option used to determine if help text should be displayed. This is set by calling HelpOption(String).

Declaration
public CommandOption OptionHelp { get; }
Property Value
Type Description
CommandOption
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OptionNameValueSeparators

Characters used to separate the option name from the value.

By default, allowed separators are ' ' (space), :, and =

Declaration
public char[] OptionNameValueSeparators { get; set; }
Property Value
Type Description
System.Char[]
Remarks

Space actually implies multiple spaces due to the way most operating system shells parse command line arguments before starting a new process.

Examples

Given --name=value, = is the separator.

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Options

Available command-line options on this command. Use GetOptions() to get all available options, which may include inherited options.

Declaration
public List<CommandOption> Options { get; }
Property Value
Type Description
System.Collections.Generic.List<CommandOption>
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OptionsComparison

The way arguments and options are matched.

Declaration
public StringComparison OptionsComparison { get; set; }
Property Value
Type Description
System.StringComparison
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OptionVersion

The options used to determine if the command version should be displayed. This is set by calling VersionOption(String, Func<String>, Func<String>).

Declaration
public CommandOption OptionVersion { get; }
Property Value
Type Description
CommandOption
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Out

The writer used to display generated help text.

Declaration
public TextWriter Out { get; set; }
Property Value
Type Description
System.IO.TextWriter
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Parent

Defaults to null. A link to the parent command if this is instance is a subcommand.

Declaration
public CommandLineApplication Parent { get; set; }
Property Value
Type Description
CommandLineApplication
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RemainingArguments

When initialized with ThrowOnUnexpectedArgument to false, this will contain any unrecognized arguments.

Declaration
public List<string> RemainingArguments { get; }
Property Value
Type Description
System.Collections.Generic.List<System.String>
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ResponseFileHandling

When enabled, the parser will treat any arguments beginning with &apos;@' as a file path to a response file. A response file contains additional arguments that will be treated as if they were passed in on the command line.

Defaults to Disabled.

Nested response false are not supported.

Declaration
public ResponseFileHandling ResponseFileHandling { get; set; }
Property Value
Type Description
ResponseFileHandling
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ShortVersionGetter

The short-form of the version to display in generated help text.

Declaration
public Func<string> ShortVersionGetter { get; set; }
Property Value
Type Description
System.Func<System.String>
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ShowInHelpText

Determines if this command appears in generated help text.

Declaration
public bool ShowInHelpText { get; set; }
Property Value
Type Description
System.Boolean
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ThrowOnUnexpectedArgument

Indicates whether the parser should throw an exception when it runs into an unexpected argument. If this field is set to false, the parser will stop parsing when it sees an unexpected argument, and all remaining arguments, including the first unexpected argument, will be stored in RemainingArguments property.

Declaration
public bool ThrowOnUnexpectedArgument { get; set; }
Property Value
Type Description
System.Boolean
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UsePagerForHelpText

Whether a Pager should be used to display help text.

Declaration
public bool UsePagerForHelpText { get; set; }
Property Value
Type Description
System.Boolean
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ValidationErrorHandler

The action to call when the command executes, but there was an error validation options or arguments. The action can return a new validation result.

Declaration
public Func<ValidationResult, int> ValidationErrorHandler { get; set; }
Property Value
Type Description
System.Func<System.ComponentModel.DataAnnotations.ValidationResult, System.Int32>
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Validators

A collection of validators that execute before invoking OnExecute(Func<Int32>). When validation fails, ValidationErrorHandler is invoked.

Declaration
public ICollection<ICommandValidator> Validators { get; }
Property Value
Type Description
System.Collections.Generic.ICollection<ICommandValidator>
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ValueParsers

Gets the default value parser provider.

The value parsers control how argument values are converted from strings to other types. Additional value parsers can be added so that domain specific types can converted. In-built value parsers can also be replaced for precise control of all type conversion.

Value parsers are currently only used by the Attribute API.

Declaration
public ValueParserProvider ValueParsers { get; }
Property Value
Type Description
ValueParserProvider
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WorkingDirectory

Defines the working directory of the application. Defaults to System.IO.Directory.GetCurrentDirectory.

This will be used as the base path for opening response files when ResponseFileHandling is true.

Declaration
public string WorkingDirectory { get; }
Property Value
Type Description
System.String

Methods

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AddName(String)

Add another name for the command.

Additional names can be shorter, longer, or alternative names by which a command may be invoked on the command line.

Declaration
public void AddName(string name)
Parameters
Type Name Description
System.String name

The name. Must not be null or empty.
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AddSubcommand(CommandLineApplication)

Add a subcommand

Declaration
public void AddSubcommand(CommandLineApplication subcommand)
Parameters
Type Name Description
CommandLineApplication subcommand
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Argument(String, String, Action<CommandArgument>, Boolean)

Adds a command line argument.

Declaration
public CommandArgument Argument(string name, string description, Action<CommandArgument> configuration, bool multipleValues = false)
Parameters
Type Name Description
System.String name
System.String description
System.Action<CommandArgument> configuration
System.Boolean multipleValues
Returns
Type Description
CommandArgument
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Argument(String, String, Boolean)

Adds a command line argument

Declaration
public CommandArgument Argument(string name, string description, bool multipleValues = false)
Parameters
Type Name Description
System.String name
System.String description
System.Boolean multipleValues
Returns
Type Description
CommandArgument
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Argument<T>(String, String, Action<CommandArgument>, Boolean)

Adds a command line argument with values that should be parsable into T.

Declaration
public CommandArgument<T> Argument<T>(string name, string description, Action<CommandArgument> configuration, bool multipleValues = false)
Parameters
Type Name Description
System.String name
System.String description
System.Action<CommandArgument> configuration
System.Boolean multipleValues
Returns
Type Description
CommandArgument<T>
Type Parameters
Name Description
T

The type of the values on the option
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Command(String, Action<CommandLineApplication>, Boolean)

Adds a subcommand.

Declaration
public CommandLineApplication Command(string name, Action<CommandLineApplication> configuration, bool throwOnUnexpectedArg = true)
Parameters
Type Name Description
System.String name

The word used to invoke the subcommand.
System.Action<CommandLineApplication> configuration
System.Boolean throwOnUnexpectedArg
Returns
Type Description
CommandLineApplication
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Command<TModel>(String, Action<CommandLineApplication<TModel>>, Boolean)

Adds a subcommand with model of type TModel.

Declaration
public CommandLineApplication<TModel> Command<TModel>(string name, Action<CommandLineApplication<TModel>> configuration, bool throwOnUnexpectedArg = true)
    where TModel : class
Parameters
Type Name Description
System.String name

The word used to invoke the subcommand.
System.Action<CommandLineApplication<TModel>> configuration
System.Boolean throwOnUnexpectedArg
Returns
Type Description
CommandLineApplication<TModel>
Type Parameters
Name Description
TModel

The model type of the subcommand.
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Dispose()

Declaration
public virtual void Dispose()
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Execute(String[])

Parses an array of strings using Parse(String[]).

If OptionHelp was matched, the generated help text is displayed in command line output.

If OptionVersion was matched, the generated version info is displayed in command line output.

If there were any validation errors produced from GetValidationResult(), ValidationErrorHandler is invoked.

If the parse result matches this command, McMaster.Extensions.CommandLineUtils.CommandLineApplication.Invoke will be invoked.

Declaration
public int Execute(params string[] args)
Parameters
Type Name Description
System.String[] args
Returns
Type Description
System.Int32

The return code from McMaster.Extensions.CommandLineUtils.CommandLineApplication.Invoke.
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Execute<TApp>(CommandLineContext)

Creates an instance of TApp, matching Arguments to all attributes on the type, and then invoking a method named "OnExecute" or "OnExecuteAsync" if it exists.

Declaration
public static int Execute<TApp>(CommandLineContext context)
    where TApp : class
Parameters
Type Name Description
CommandLineContext context

The execution context.
Returns
Type Description
System.Int32

The process exit code
Type Parameters
Name Description
TApp

A type that should be bound to the arguments.
Exceptions
Type Condition
System.InvalidOperationException

Thrown when attributes are incorrectly configured.
See Also
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Execute<TApp>(IConsole, String[])

Creates an instance of TApp, matching args to all attributes on the type, and then invoking a method named "OnExecute" or "OnExecuteAsync" if it exists.

Declaration
public static int Execute<TApp>(IConsole console, params string[] args)
    where TApp : class
Parameters
Type Name Description
IConsole console

The console to use
System.String[] args

The arguments
Returns
Type Description
System.Int32

The process exit code
Type Parameters
Name Description
TApp

A type that should be bound to the arguments.
Exceptions
Type Condition
System.InvalidOperationException

Thrown when attributes are incorrectly configured.
See Also
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Execute<TApp>(String[])

Creates an instance of TApp, matching args to all attributes on the type, and then invoking a method named "OnExecute" or "OnExecuteAsync" if it exists.

Declaration
public static int Execute<TApp>(params string[] args)
    where TApp : class
Parameters
Type Name Description
System.String[] args

The arguments
Returns
Type Description
System.Int32

The process exit code
Type Parameters
Name Description
TApp

A type that should be bound to the arguments.
Exceptions
Type Condition
System.InvalidOperationException

Thrown when attributes are incorrectly configured.
See Also
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ExecuteAsync(String[], CancellationToken)

Parses an array of strings using Parse(String[]).

If OptionHelp was matched, the generated help text is displayed in command line output.

If OptionVersion was matched, the generated version info is displayed in command line output.

If there were any validation errors produced from GetValidationResult(), ValidationErrorHandler is invoked.

If the parse result matches this command, McMaster.Extensions.CommandLineUtils.CommandLineApplication.Invoke will be invoked.

Declaration
public Task<int> ExecuteAsync(string[] args, CancellationToken cancellationToken = default(CancellationToken))
Parameters
Type Name Description
System.String[] args
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Int32>

The return code from McMaster.Extensions.CommandLineUtils.CommandLineApplication.Invoke.
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ExecuteAsync<TApp>(CommandLineContext, CancellationToken)

Creates an instance of TApp, matching Arguments to all attributes on the type, and then invoking a method named "OnExecute" or "OnExecuteAsync" if it exists.

Declaration
public static Task<int> ExecuteAsync<TApp>(CommandLineContext context, CancellationToken cancellationToken = default(CancellationToken))
    where TApp : class
Parameters
Type Name Description
CommandLineContext context

The execution context.
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Int32>

The process exit code
Type Parameters
Name Description
TApp

A type that should be bound to the arguments.
Exceptions
Type Condition
System.InvalidOperationException

Thrown when attributes are incorrectly configured.
See Also
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ExecuteAsync<TApp>(IConsole, String[])

Creates an instance of TApp, matching args to all attributes on the type, and then invoking a method named "OnExecute" or "OnExecuteAsync" if it exists.

Declaration
public static Task<int> ExecuteAsync<TApp>(IConsole console, params string[] args)
    where TApp : class
Parameters
Type Name Description
IConsole console

The console to use
System.String[] args

The arguments
Returns
Type Description
System.Threading.Tasks.Task<System.Int32>

The process exit code
Type Parameters
Name Description
TApp

A type that should be bound to the arguments.
Exceptions
Type Condition
System.InvalidOperationException

Thrown when attributes are incorrectly configured.
See Also
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ExecuteAsync<TApp>(String[])

Creates an instance of TApp, matching args to all attributes on the type, and then invoking a method named "OnExecute" or "OnExecuteAsync" if it exists.

Declaration
public static Task<int> ExecuteAsync<TApp>(params string[] args)
    where TApp : class
Parameters
Type Name Description
System.String[] args

The arguments
Returns
Type Description
System.Threading.Tasks.Task<System.Int32>

The process exit code
Type Parameters
Name Description
TApp

A type that should be bound to the arguments.
Exceptions
Type Condition
System.InvalidOperationException

Thrown when attributes are incorrectly configured.
See Also
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ExecuteAsync<TApp>(String[], CancellationToken)

Creates an instance of TApp, matching args to all attributes on the type, and then invoking a method named "OnExecute" or "OnExecuteAsync" if it exists.

Declaration
public static Task<int> ExecuteAsync<TApp>(string[] args, CancellationToken cancellationToken = default(CancellationToken))
    where TApp : class
Parameters
Type Name Description
System.String[] args

The arguments
System.Threading.CancellationToken cancellationToken
Returns
Type Description
System.Threading.Tasks.Task<System.Int32>

The process exit code
Type Parameters
Name Description
TApp

A type that should be bound to the arguments.
Exceptions
Type Condition
System.InvalidOperationException

Thrown when attributes are incorrectly configured.
See Also
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GetFullNameAndVersion()

Gets FullName and ShortVersionGetter.

Declaration
public virtual string GetFullNameAndVersion()
Returns
Type Description
System.String
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GetHelpText()

Produces help text describing command usage.

Declaration
public virtual string GetHelpText()
Returns
Type Description
System.String

The help text.
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GetOptions()

Gets all command line options available to this command, including any inherited options.

Declaration
public IEnumerable<CommandOption> GetOptions()
Returns
Type Description
System.Collections.Generic.IEnumerable<CommandOption>

Command line options.
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GetValidationResult()

Validates arguments and options.

Declaration
public ValidationResult GetValidationResult()
Returns
Type Description
System.ComponentModel.DataAnnotations.ValidationResult

The first validation result that is not System.ComponentModel.DataAnnotations.ValidationResult.Success if there is an error.
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GetVersionText()

Produces text describing version of the command.

Declaration
public virtual string GetVersionText()
Returns
Type Description
System.String

The version text.
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HandleParseResult(ParseResult)

Handle the result of parsing command line arguments.

Declaration
protected virtual void HandleParseResult(ParseResult parseResult)
Parameters
Type Name Description
ParseResult parseResult

The parse result.
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HelpOption(String)

Helper method that adds a help option.

Declaration
public CommandOption HelpOption(string template)
Parameters
Type Name Description
System.String template
Returns
Type Description
CommandOption
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HelpOption(String, Boolean)

Helper method that adds a help option.

Declaration
public CommandOption HelpOption(string template, bool inherited)
Parameters
Type Name Description
System.String template
System.Boolean inherited
Returns
Type Description
CommandOption
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OnExecute(Func<Int32>)

Defines a callback for when this command is invoked.

Declaration
public void OnExecute(Func<int> invoke)
Parameters
Type Name Description
System.Func<System.Int32> invoke
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OnExecuteAsync(Func<CancellationToken, Task<Int32>>)

Defines an asynchronous callback.

Declaration
public void OnExecuteAsync(Func<CancellationToken, Task<int>> invoke)
Parameters
Type Name Description
System.Func<System.Threading.CancellationToken, System.Threading.Tasks.Task<System.Int32>> invoke
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OnParsingComplete(Action<ParseResult>)

Adds an action to be invoked when all command line arguments have been parsed and validated.

Declaration
public void OnParsingComplete(Action<ParseResult> action)
Parameters
Type Name Description
System.Action<ParseResult> action

The action to be invoked
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Option(String, String, CommandOptionType)

Adds a command-line option.

Declaration
public CommandOption Option(string template, string description, CommandOptionType optionType)
Parameters
Type Name Description
System.String template
System.String description
CommandOptionType optionType
Returns
Type Description
CommandOption
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Option(String, String, CommandOptionType, Action<CommandOption>)

Adds a command-line option.

Declaration
public CommandOption Option(string template, string description, CommandOptionType optionType, Action<CommandOption> configuration)
Parameters
Type Name Description
System.String template
System.String description
CommandOptionType optionType
System.Action<CommandOption> configuration
Returns
Type Description
CommandOption
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Option(String, String, CommandOptionType, Action<CommandOption>, Boolean)

Adds a command line option.

Declaration
public CommandOption Option(string template, string description, CommandOptionType optionType, Action<CommandOption> configuration, bool inherited)
Parameters
Type Name Description
System.String template
System.String description
CommandOptionType optionType
System.Action<CommandOption> configuration
System.Boolean inherited
Returns
Type Description
CommandOption
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Option(String, String, CommandOptionType, Boolean)

Adds a command-line option.

Declaration
public CommandOption Option(string template, string description, CommandOptionType optionType, bool inherited)
Parameters
Type Name Description
System.String template
System.String description
CommandOptionType optionType
System.Boolean inherited
Returns
Type Description
CommandOption
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Option<T>(String, String, CommandOptionType, Action<CommandOption>, Boolean)

Adds a command line option with values that should be parsable into T.

Declaration
public CommandOption<T> Option<T>(string template, string description, CommandOptionType optionType, Action<CommandOption> configuration, bool inherited)
Parameters
Type Name Description
System.String template
System.String description
CommandOptionType optionType
System.Action<CommandOption> configuration
System.Boolean inherited
Returns
Type Description
CommandOption<T>

The option
Type Parameters
Name Description
T

The type of the values on the option
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Parse(String[])

Parses an array of strings, matching them against Options, Arguments, and Commands.

Declaration
public ParseResult Parse(params string[] args)
Parameters
Type Name Description
System.String[] args

Command line arguments.
Returns
Type Description
ParseResult

The result of parsing.
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ShowHelp()

Show full help.

Declaration
public void ShowHelp()
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ShowHelp(Boolean)

Show full help.

Declaration
public void ShowHelp(bool usePager)
Parameters
Type Name Description
System.Boolean usePager

Use a console pager to display help text, if possible.
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ShowHint()

Show short hint that reminds users to use help option.

Declaration
public virtual void ShowHint()
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ShowRootCommandFullNameAndVersion()

Traverses up Parent and displays the result of GetFullNameAndVersion().

Declaration
public void ShowRootCommandFullNameAndVersion()
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ShowVersion()

Displays version information that includes FullName and LongVersionGetter.

Declaration
public void ShowVersion()
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VersionOption(String, Func<String>, Func<String>)

Helper method that adds a version option.

Declaration
public CommandOption VersionOption(string template, Func<string> shortFormVersionGetter, Func<string> longFormVersionGetter = null)
Parameters
Type Name Description
System.String template
System.Func<System.String> shortFormVersionGetter
System.Func<System.String> longFormVersionGetter
Returns
Type Description
CommandOption
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VersionOption(String, String, String)

Helper method that adds a version option from known versions strings.

Declaration
public CommandOption VersionOption(string template, string shortFormVersion, string longFormVersion = null)
Parameters
Type Name Description
System.String template
System.String shortFormVersion
System.String longFormVersion
Returns
Type Description
CommandOption

Explicit Interface Implementations

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IServiceProvider.GetService(Type)

Declaration
object IServiceProvider.GetService(Type serviceType)
Parameters
Type Name Description
System.Type serviceType
Returns
Type Description
System.Object

Implements

System.IServiceProvider
System.IDisposable

Extension Methods