commandlineparser / commandlineparser/commandline
"InvalidOperationException: appears to be Immutable with invalid constructor" when suppling invalid (throwable) args
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- C#
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描述
# 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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研究方向
從最小可重現的 C# 程式以及使用 test -l "FooBar" 的 Parser.Default.ParseArguments 呼叫開始;將其與正常運作的 "en-US" 情況進行比較。當無效的建構函式引數產生傳遞給 WithNotParsed 的錯誤,而不是擲出 InvalidOperationException 時,修正就完成了。
由索引模型根據 Issue 內容生成。
評估
- 技術堆疊
- csharp
- 領域
- cli
- Issue 類型
- 缺陷
- 難度
- 3/5
- 預估耗時
- 1-2 天
- 活躍度
- 停滯
- 描述清晰度
- 描述清楚
- 新手友好度
- 45/100