c#4.0新特性之一: Dynamic Lookup (1)

废话不多说，直接开始。先看程序：
class Program

2

12public class Foo

13.method private hidebysig static void Main(string[] args) cil managed

2{

3 .entrypoint

4 // Code size 205 (0xcd)

5 .maxstack 7

6 .locals init ([0] object foo1)

7 IL_0000: newobj instance void LearnCSharp4.Foo::.ctor()

8 IL_0005: stloc.0

9 IL_0006: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site1'

10 IL_000b: brtrue.s IL_0033

11 IL_000d: call class [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder::GetInstance()

12 IL_0012: ldc.i4.0

13 IL_0013: ldc.i4.0

14 IL_0014: ldstr "Do1"

15 IL_0019: ldtoken [mscorlib]System.Object

16 IL_001e: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle)

17 IL_0023: ldnull

18 IL_0024: newobj instance void [System.Core]Microsoft.CSharp.RuntimeBinder.CSharpCallPayload::.ctor(class [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder,

19 bool,

20 bool,

21 string,

22 class [mscorlib]System.Type,

23 class [mscorlib]System.Type[])

24 IL_0029: call class [System.Core]System.Scripting.Actions.CallSite`1<!0> class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>>::Create(class [System.Core]System.Scripting.Actions.CallSiteBinder)

25 IL_002e: stsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site1'

26 IL_0033: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site1'

27 IL_0038: ldfld !0 class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>>::Target

28 IL_003d: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site1'

29 IL_0042: ldloc.0

30 IL_0043: callvirt instance void class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>::Invoke(!0,

31 !1)

32 IL_0048: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site2'

33 IL_004d: brtrue.s IL_0075

34 IL_004f: call class [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder::GetInstance()

35 IL_0054: ldc.i4.0

36 IL_0055: ldc.i4.0

37 IL_0056: ldstr "Do2"

38 IL_005b: ldtoken [mscorlib]System.Object

39 IL_0060: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle)

40 IL_0065: ldnull

41 IL_0066: newobj instance void [System.Core]Microsoft.CSharp.RuntimeBinder.CSharpCallPayload::.ctor(class [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder,

42 bool,

43 bool,

44 string,

45 class [mscorlib]System.Type,

46 class [mscorlib]System.Type[])

47 IL_006b: call class [System.Core]System.Scripting.Actions.CallSite`1<!0> class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>>::Create(class [System.Core]System.Scripting.Actions.CallSiteBinder)

48 IL_0070: stsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site2'

49 IL_0075: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site2'

50 IL_007a: ldfld !0 class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>>::Target

51 IL_007f: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site2'

52 IL_0084: ldloc.0

53 IL_0085: callvirt instance void class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>::Invoke(!0,

54 !1)

55 IL_008a: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site3'

56 IL_008f: brtrue.s IL_00b7

57 IL_0091: call class [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder::GetInstance()

58 IL_0096: ldc.i4.0

59 IL_0097: ldc.i4.0

60 IL_0098: ldstr "KissFanweixiao"

61 IL_009d: ldtoken [mscorlib]System.Object

62 IL_00a2: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle)

63 IL_00a7: ldnull

64 IL_00a8: newobj instance void [System.Core]Microsoft.CSharp.RuntimeBinder.CSharpCallPayload::.ctor(class [System.Core]Microsoft.CSharp.RuntimeBinder.RuntimeBinder,

65 bool,

66 bool,

67 string,

68 class [mscorlib]System.Type,

69 class [mscorlib]System.Type[])

70 IL_00ad: call class [System.Core]System.Scripting.Actions.CallSite`1<!0> class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>>::Create(class [System.Core]System.Scripting.Actions.CallSiteBinder)

71 IL_00b2: stsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site3'

72 IL_00b7: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site3'

73 IL_00bc: ldfld !0 class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>>::Target

74 IL_00c1: ldsfld class [System.Core]System.Scripting.Actions.CallSite`1<class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>> LearnCSharp4.Program/'<Main>o__SiteContainer0'::'<>p__Site3'

75 IL_00c6: ldloc.0

76 IL_00c7: callvirt instance void class [System.Core]System.Action`2<class [System.Core]System.Scripting.Actions.CallSite,object>::Invoke(!0,

77 !1)

78 IL_00cc: ret

79} // end of method Program::Main
如果不喜欢看MSIL的话可以这样看：
private static void Main(string[] args)

2{

3{

6{

11{

16 <Main>o__SiteContainer0.<>p__Site3 = CallSite<Action<CallSite, object>>.Create(new CSharpCallPayload(Microsoft.CSharp.RuntimeBinder.RuntimeBinder.GetInstance(), false, false, "KissFanweixiao", typeof(object), null));

17 }

18 <Main>o__SiteContainer0.<>p__Site3.Target(<Main>o__SiteContainer0.<>p__Site3, foo1);

19}
本文旨在为不方便下载和使用vs2010虚拟机朋友帮个忙.
(在后台编辑的时候报stack overflow的问题...无法提交...)

c#4.0新特性之一: Dynamic Lookup (2)