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关于c#:我不想再传递-nameof-了

有的时候抛出一个异样,咱们须要晓得是哪个办法抛出的异样。那么,咱们能够通过传递 nameof 来获取调用者的办法名。然而,感觉很烦,每次都要传递 nameof。那么,有没有更好的办法呢?

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

获取调用者的文件门路。

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

获取调用者的办法名。

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,当前再也不必放心 ArgumentException 还须要写一个 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

总结

通过下面的几个例子,咱们能够看到,借助在编译时获取调用者的行号、文件路劲和调用者办法名的个性,咱们能够在开发中更加不便的进行日志记录。

参考

  • CallerLineNumberAttribute Class1
  • CallerFilePathAttribute Class2
  • CallerMemberNameAttribute Class3
  • CallerArgumentExpressionAttribute Class4

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