Performance Considerations: Reflection operations

Test code
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1 using System;
2 using System. Collections. Generic;
3 using System. Linq;
4 using System. Text;
5 using System. Reflection;
6
7 namespace CSharpStudy
8 {
9 class Program
10 {
11 static void Main (string [] args)
12 {
13 {
14 dynamic dynamicObject = new StringBuilder ();
15
16 Helper. Watch () =>
17 {
18 for (var I = 0; I <1000000; I ++)
19 {
20 dynamicObject. Append ("hello ");
21}
22 });
23}
24
25 {
26 var appendMethod = typeof (StringBuilder). GetMethod ("Append", new Type [] {typeof (string )});
27 var sb = new StringBuilder ();
28
29 Helper. Watch () =>
30 {
31 for (var I = 0; I <1000000; I ++)
32 {
33 appendMethod. Invoke (sb, new object [] {"hello "});
34}
35 });
36}
37
38 {
39 var appendMethod = typeof (StringBuilder). GetMethod ("Append", new Type [] {typeof (string )});
40 var sb = new StringBuilder ();
41 var appendAction = (Func <string, StringBuilder>) Delegate. CreateDelegate (typeof (Func <string, StringBuilder>), sb, appendMethod );
42
43 Helper. Watch () =>
44 {
45 for (var I = 0; I <1000000; I ++)
46 {
47 appendAction ("hello ");
48}
49 });
50}
51}
52}
53

 

 
 

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