使用条件属性 [Conditional("DEBUG")]，而不使用#if DEBUG

View Code 
 1 using System; 
 2 using System.Diagnostics;
 3 namespace TraceFunctions 
 4 {
 5    public class Trace 
 6    { 
 7        [Conditional("DEBUG")] //条件属性
 8        public static void Message(string traceMessage) 
 9        { 
10            Console.WriteLine("[TRACE] - " + traceMessage); 
11        } 
12    } 
13 }
14 
15 using System; 
16 using TraceFunctions; 
17 
18 public class TraceClient 
19 {
20    public static void Main(string[] args) 
21    { 
22       Trace.Message("Main Starting"); 
23    
24       if (args.Length == 0) 
25       { 
26           Console.WriteLine("No arguments have been passed"); 
27       } 
28       else 
29       { 
30           for( int i=0; i < args.Length; i++)    
31           { 
32               Console.WriteLine("Arg[{0}] is [{1}]",i,args[i]); 
33           } 
34       } 
35 
36        Trace.Message("Main Ending"); 
37    } 
38 }

如果使用#if DEBUG，则为

View Code 
 1 using System; 
 2 using System.Diagnostics;
 3 namespace TraceFunctions 
 4 {
 5    public class Trace 
 6    { 
 7        public static void Message(string traceMessage) 
 8        { 
 9 #if DEBUG
10            Console.WriteLine("[TRACE] - " + traceMessage); 
11 #endif
12        } 
13    } 
14 }
15 using System; 
16 using TraceFunctions; 
17 
18 public class TraceClient 
19 {
20    public static void Main(string[] args) 
21    { 
22       Trace.Message("Main Starting"); 
23    
24       if (args.Length == 0) 
25       { 
26           Console.WriteLine("No arguments have been passed"); 
27       } 
28       else 
29       { 
30           for( int i=0; i < args.Length; i++)    
31           { 
32               Console.WriteLine("Arg[{0}] is [{1}]",i,args[i]); 
33           } 
34       } 
35 
36        Trace.Message("Main Ending"); 
37    } 
38 }
在DEGUB下和之前的是一样的，但在Release下， public static void Message(string traceMessage)函数为空函数，此时它什么也不做，但却会被调用，增大了开销

posted on 2011-04-07 09:51  源远流长  阅读(655)  评论(0)    收藏  举报

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