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Does the Options attribute class really need to be sealed?

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難度
5/5
預估耗時
一週以上
新手友好度
35/100
Issue 類型
功能
描述清晰度
基本清楚
活躍度
停滯
技術堆疊
csharp
領域
cli

研究方向

未指定檔案或測試。首先定位 C# Options/OptionAttribute 宣告及其 sealed 修飾子,然後檢查屬性如何被使用以及測試涵蓋情況。完成標準是,專案已就是否支援衍生選項屬性作出明確且經過審查的決定;如果決定為 yes,則相應更新 API 和測試。

由索引模型根據 Issue 內容生成。

描述

awaiting response

I have been using CommandLineParser for a while now (and it's changed how I build tools -- thank you!) including in a program with ~50 Verbs (and growing), and since many of the Verbs take common options, I was hoping to extend Options to provide common handling of them.

Simple example: if 15 Verbs take a LogFile option, each of which has a long name ("log-file") and a help description, I can do this now by constant strings to keep them consistent, but if I were able to do:

[AttributeUsage(AttributeTargets.Property)]
public class LogFileOptionAttribute : OptionAttribute
{
    public LogFileOptionAttribute(bool required = false)
        : base("log-file") // I don't use short option names for anything
    {
        HelpText = "Name of the logfile to use for blah blah blah";
        Required = required;
    }
}

and then adorn the actual option with:

public class BlahOptions {
    ...
    [LogFileOption]
    public string LogFileName {get ; set; }
    ...
}

I have easily a dozen of these common options. It's not a huge deal to create constant strings:

    [Option(OPTION_LOGFILE_NAME, HelpText = OPTION_LOGFILE_HELPTEXT)]

but adding this level of abstraction would be more convenient.

If there's a good reason for this class to be sealed, then so be it, but mine doesn't feel like a ridiculous use case. I may well get to 100 verbs for this tool by the time I'm done.

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C#
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