commandlineparser / commandlineparser/commandline

"InvalidOperationException: appears to be Immutable with invalid constructor" when suppling invalid (throwable) args

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#734 3 commenti 10 reazioni 0 assegnatari Vedi su GitHub
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Descrizione

# Description

When calling constructor with single string, if the constructor throws - the result of parsing is also throwing (misleading) exception instead of returning error lambda.

# Minimal reproducable code:

````csharp
using System;
using System.Globalization;
using CommandLine;

class Program
{
[Verb("test")]
public class Options
{
private CultureInfo _localization;

[Option('l', "lang", Required = true, Default = "en")]
public CultureInfo Localization => _localization;

public Options(CultureInfo localization)
{
_localization = localization;
}

}

static void Main(string[] args)
{
var types = new Type[] { typeof(Options) };
var result = Parser.Default.ParseArguments(args, types);
result
.WithParsed(obj => {})
.WithNotParsed(errs => {});
}
}
````

Call with: `test -l "FooBar"`

# Expected behaviour

The `WithNotParsed` lambda should be called with error message pointing to invalid argument

# Actual behaviour

The line with `var result = Parser.Default.ParseArguments(args, types);` throws:

`System.InvalidOperationException: 'Type Program+Options appears to be Immutable with invalid constructor. Check that constructor arguments have the same name and order of their underlying Type. Constructor Parameters can be ordered as: '(localization)''`

# Additional info:

When called with `test -l "en-US"` the code will correctly enter `WithParsed` lambda.

# Version data:

- Tested on Windows / .NET Framework 4.7.2
- Tested on version 2.8.0 from NuGet of CommandLineParser

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