记录和调试消息

Question

I have my debug messages evaluate expensive string operations when printing messages like this: 当打印如下消息时，我的调试消息会评估昂贵的字符串操作：

Log.Debug("here it is" + obj.ExpensiveToString())

Now even if the log level isn't set to Debug , it still evaluates the expensive string operation. 现在，即使未将日志级别设置为Debug ，它仍会评估昂贵的字符串操作。

So without having to do this: 因此，无需执行以下操作：

if(debugMode) Log.Debug("here it is" + obj.ExpensiveToString())

or having lots of complex Log.Debug() methods, how can I get around this? 还是有很多复杂的Log.Debug()方法，如何解决呢？

Answer 1

use a compiler directive 使用编译器指令

#if DEBUG
  Log.Debug("Here it is: "+obj.ExpensiveToString());
#endif

since these directives increase code verbosity use them for the expensive parts. 因为这些指令增加了代码的冗长性，所以将它们用于昂贵的部分。

Another alternative is to modify or supplement your log system to accept a Func<string> 另一种选择是修改或补充您的日志系统以接受Func<string>

public void LogDebug(Func<string> evalMe){

#if DEBUG
    if (evalMe!=null)
      Log.Debug(evalMe);
#endif

}

and then call it like this: 然后这样称呼它：

LogDebug(()=>"Here it is: "+obj.ExpensiveToString());