是否有可能使用CallerMemberNameAttribute在F＃ | 可能使用CallerMemberNameAttribute在F＃

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问题描述

的属性和C＃的例子在这里指出，但它不看为FSharp是可能的。

The attribute and C# examples are noted here but it doesn't look to be possible for FSharp.

<一个href=\"http://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.callermembernameattribute.aspx?cs-save-lang=1&cs-lang=csharp#$c$c-snippet-2\">http://msdn.microsoft.com/en-us/library/system.runtime.compilerservices.callermembernameattribute.aspx?cs-save-lang=1&cs-lang=csharp#$c$c-snippet-2

// using System.Runtime.CompilerServices
// using System.Diagnostics;

public void DoProcessing()
{
    TraceMessage("Something happened.");
}

public void TraceMessage(string message,
        [CallerMemberName] string memberName = "",
        [CallerFilePath] string sourceFilePath = "",
        [CallerLineNumber] int sourceLineNumber = 0)
{
    Trace.WriteLine("message: " + message);
    Trace.WriteLine("member name: " + memberName);
    Trace.WriteLine("source file path: " + sourceFilePath);
    Trace.WriteLine("source line number: " + sourceLineNumber);
}

示例输出：

message: Something happened.
member name: DoProcessing
source file path: c:\Users\username\Documents\Visual Studio 2012\Projects\CallerInfoCS\CallerInfoCS\Form1.cs
source line number: 31

是否有可能做上述F＃中若有什么记号？

Is it possible to do the above in F# and if so what is the notation?

推荐答案

通过显示名称 CallerMemberName 不会在code出现在任何地方，所以我认为不支持此功能。（当然您可以标记与属性的参数，但这些属性是特殊的 - 他们指示编译器，而不是被发现，并在运行时的一些方式使用。）

A quick search through the compiler source code shows that the name CallerMemberName does not appear anywhere in the code, so I think this feature is not supported. (You can certainly mark a parameter with the attribute, but these attributes are special - they instruct the compiler instead of being discovered and used in some way at runtime.)

更新2016年7月：截至6月底， CallerLineNumber 和 CallerFilePath ，但 CallerMemberName 仍缺席。这似乎是一个特别是比较难实现，很遗憾。

Update July 2016: As of late June, F# now supports CallerLineNumber and CallerFilePath, but CallerMemberName is still absent. It seems like that one in particular is more difficult to implement, unfortunately.

在一个相关的说明，F＃有一个那几个特殊标识符让你当前的源文件名和行号，所以你可能能够获得类似的信息与 __ source_directory中__ 和 __ LINE __ 结果
（但不能从来电者在C＃）。

On a related note, F# has a few special identifiers that let you get the current source file name and line number, so you might be able to get similar information with __SOURCE_DIRECTORY__ and __LINE__
(but not from the caller as in C#).

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