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我不想再传递 nameof 了 - Newbe36524

 1 year ago
source link: https://www.cnblogs.com/newbe36524/p/0x01D-I-don-t-want-to-pass-nameof-anymore.html
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有的时候抛出一个异常，我们需要知道是哪个方法抛出的异常。那么，我们可以通过传递 nameof 来获取调用者的方法名。但是，感觉很烦，每次都要传递 nameof。那么，有没有更好的方法呢？

CallerLineNumberAttribute

获取调用者的行号。

using System;using System.Runtime.CompilerServices; public static class Program{ public static void Main() { TraceMessage("Something happened."); } public static void TraceMessage(string message, [CallerLineNumber] int sourceLineNumber = 0) { Console.WriteLine("Line: {0} - {1}", sourceLineNumber, message); }}// The example displays the following output:// Line: 10 - Something happened.

CallerFilePathAttribute

获取调用者的文件路径。

using System;using System.IO;using System.Runtime.CompilerServices; public static class Program{ public static void Main() { TraceMessage("Something happened."); } public static void TraceMessage(string message, [CallerFilePath] string sourceFilePath = "") { Console.WriteLine("File: {0} - {1}", Path.GetFileName(sourceFilePath), message); }}// The example displays the following output:// File: Program.cs - Something happened.

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CallerMemberNameAttribute

获取调用者的方法名。

using System;using System.Runtime.CompilerServices; public static class Program{ public static void Main() { DoProcessing(); } public static void DoProcessing() { TraceMessage("Something happened."); } public static void TraceMessage(string message, [CallerMemberName] string memberName = "") { Console.WriteLine("Member: {0} - {1}", memberName, message); }}// The example displays the following output:// Member: DoProcessing - Something happened.

CallerArgumentExpressionAttribute

获取调用者的参数表达式。C# 10.0 新增。

这个其实很好用，以后再也不用担心 ArgumentException 还需要写一个 nameof 了。

using System;using System.Runtime.CompilerServices; public static class Program{ public static void Main() { int x = 10; int y = 20; Assert(x > y, "x > y"); } public static void Assert(bool condition, [CallerArgumentExpression("condition")] string message = null) { Console.WriteLine("Condition: {0} - {1}", condition, message); }}// The example displays the following output:// Condition: False - x > y

通过上面的几个例子，我们可以看到，借助在编译时获取调用者的行号、文件路劲和调用者方法名的特性，我们可以在开发中更加方便的进行日志记录。

感谢您的阅读，如果您觉得本文有用，请点赞、关注和转发。

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  1. https://learn.microsoft.com/dotnet/api/system.runtime.compilerservices.callerlinenumberattribute?view=net-7.0&WT.mc_id=DX-MVP-5003606↩

  2. https://learn.microsoft.com/dotnet/api/system.runtime.compilerservices.callerfilepathattribute?view=net-7.0&WT.mc_id=DX-MVP-5003606↩

  3. https://learn.microsoft.com/dotnet/api/system.runtime.compilerservices.callermembernameattribute?view=net-7.0&WT.mc_id=DX-MVP-5003606↩

  4. https://learn.microsoft.com/dotnet/api/system.runtime.compilerservices.callerargumentexpressionattribute?view=net-7.0&WT.mc_id=DX-MVP-5003606↩


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