[英]Debug.WriteLine in release build
有没有办法在发布版本中使用Debug.WriteLine
而不定义DEBUG
?
No, but you can use the Trace
in release by defining TRACE
and using Trace.WriteLine.
不,但您可以通过定义TRACE
并使用Trace.WriteLine.
来使用Trace
in release Trace.WriteLine.
Have a look here: 看看这里:
https://support.microsoft.com/en-us/help/815788/how-to-trace-and-debug-in-visual-c https://support.microsoft.com/en-us/help/815788/how-to-trace-and-debug-in-visual-c
No. If you don't define the DEBUG
preprocessor symbol, any calls to Debug.*
will be removed by the compiler due to the [Conditional("DEBUG")]
attribute being applied. 否。如果未定义DEBUG
预处理程序符号,则由于应用了[Conditional("DEBUG")]
属性,编译器将删除对Debug.*
任何调用。
You might want to consider Trace.WriteLine
or other logging techniques though. 您可能想要考虑Trace.WriteLine
或其他日志记录技术。
While you still have to define DEBUG - you don't have to do it assembly wide. 虽然你仍然需要定义DEBUG - 你不必在程序集范围内进行。 You can define it only in the source files that you want. 您只能在所需的源文件中定义它。 So if you want debug logging from a particular class you can define DEBUG just for that source file. 因此,如果您希望从特定类进行调试日志记录,则可以仅为该源文件定义DEBUG。
#define DEBUG
using System.Diagnostics;
...
class Logger
{
void Log( string msg ){ Debug.WriteLine( msg ); }
}
Yes. 是。 You can, as mentioned in the above comments use TRACE, or without defining any compile time constants, by using Expression Trees. 您可以使用表达式树,如上面的注释中所述,使用TRACE,或者不定义任何编译时常量。
var p = Expression.Parameter(typeof(string), "text");
var callExp =
Expression.Call(
typeof(System.Diagnostics.Debug).GetRuntimeMethod(
"WriteLine", new [] { typeof(string) }),
p);
Action<string> compiledAction = Expression.Lambda<Action<string>>(
callExp, p)
.Compile();
After this, you can invoke the Debug.WriteLine anytime, by calling 在此之后,您可以通过调用随时调用Debug.WriteLine
compiledAction("Debug text");
You're essentially tricking the compiler by not having a static method call, but instead dynamically constructing it at run-time. 您实际上是通过不进行静态方法调用来欺骗编译器,而是在运行时动态构造它。
There is no performance-hit since, the action is compiled and re-used. 由于没有性能影响,因此编译并重新使用该操作。
This is how I wrote a DebugLogger in SharpLog. 这就是我在SharpLog中编写DebugLogger的方法。
You may take a look at the source code here, if it interests you: https://github.com/prasannavl/SharpLog/blob/master/SharpLog/DebugLogger.cs 如果您感兴趣,可以在这里查看源代码: https : //github.com/prasannavl/SharpLog/blob/master/SharpLog/DebugLogger.cs
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