『.Net反射』ILGenerator.Emit 动态MSIL 编程 入门
转载请标明：舒小龙 http://www.cnblogs.com/shuxiaolong/articles/2924574.html
什么都不说，直接贴代码：
1 class Program 2 { 3 static void Main(string[] args) 4 { 5 SetValue(); 6 } 7
8 public static void SetValue() 9 { 10 int temp1 = 123; 11 int temp2 = 234; 12 int sum = temp1 + temp2; 13 string sumStr = sum.ToString(); 14
15 Console.WriteLine(sumStr); 16 } 17 }
对应的 ILGenerator.Emit 代码：
1 class Program 2 { 3 static void Main(string[] args) 4 { 5 //.method public hidebysig static void SetValue() cil managed 6 //{ 7 // // 代码大小 30 (0x1e) 8 // .maxstack 2 9 // .locals init ([0] int32 temp1, 10 // [1] int32 temp2, 11 // [2] int32 sum, 12 // [3] string sumStr) 13 // IL_0000: nop 14 // IL_0001: ldc.i4.s 123 15 // IL_0003: stloc.0 16 // IL_0004: ldc.i4 0xea 17 // IL_0009: stloc.1 18 // IL_000a: ldloc.0 19 // IL_000b: ldloc.1 20 // IL_000c: add 21 // IL_000d: stloc.2 22 // IL_000e: ldloca.s sum 23 // IL_0010: call instance string [mscorlib]System.Int32::ToString() 24 // IL_0015: stloc.3 25 // IL_0016: ldloc.3 26 // IL_0017: call void [mscorlib]System.Console::WriteLine(string) 27 // IL_001c: nop 28 // IL_001d: ret 29 //} // end of method Program::SetValue
30 SetValue(); 31 } 32
33 public static void SetValue() 34 { 35 DynamicMethod dm = new DynamicMethod("SetValueMethod", null, new Type[] { /*typeof(object), typeof(object)*/ }, true); 36
37 ILGenerator generator = dm.GetILGenerator(); 38
39 generator.DeclareLocal(typeof(int)); //声明变量
40 generator.DeclareLocal(typeof(int)); //声明变量
41 generator.DeclareLocal(typeof(int)); //声明变量
42 generator.DeclareLocal(typeof(string)); //声明变量 43
44 //加载参数1，需要注意的是静态方法Ldarg_0对应的是参数1， 45 //实例方法Ldarg_0对应的是this指针，Ldarg_1对应的是参数1， 46 //即每个实例方法都传递一个隐含的this指针 47
48 //int temp1 = 123; 49 //int temp2 = 234; 50 //int sum = temp1 + temp2; 51 //string sumStr = sum.ToString(); 52 //Console.WriteLine(sumStr); 53
54 //temp1 = 123
55 generator.Emit(OpCodes.Ldc_I4, 123); 56 generator.Emit(OpCodes.Stloc_0); 57
58 //temp2 = 234
59 generator.Emit(OpCodes.Ldc_I4, 234); 60 generator.Emit(OpCodes.Stloc_1); 61
62 //sum = temp1 + temp2
63 generator.Emit(OpCodes.Ldloc_0); 64 generator.Emit(OpCodes.Ldloc_1); 65 generator.Emit(OpCodes.Add); 66 generator.Emit(OpCodes.Stloc_2); 67
68 //string sumStr = sum.ToString(); 69 //ldloca.s sum 70 //call instance string [mscorlib]System.Int32::ToString() 71 //stloc.3 72 //调用成员函数
73 generator.Emit(OpCodes.Ldloca_S, 2); //generator.Emit(OpCodes.Ldloc_2);
74 MethodInfo toStringMethodInfo = typeof(Int32).GetMethod("ToString", new Type[] { }); 75 generator.Emit(OpCodes.Call, toStringMethodInfo); 76 //generator.EmitCall(OpCodes.Call, toStringMethodInfo, null); //和上面代码 同意思
77 generator.Emit(OpCodes.Stloc_3); 78
79 //Console.WriteLine(sumStr); 80 //IL_0016: ldloc.3 81 //IL_0017: call void [mscorlib]System.Console::WriteLine(string) 82 //调用静态函数
83 generator.Emit(OpCodes.Ldloc_3); 84 MethodInfo writeLineMethodInfo = typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }); 85 generator.Emit(OpCodes.Call, writeLineMethodInfo); 86 //generator.EmitCall(OpCodes.Call, writeLineMethodInfo, null); //和上面代码 同意思 87
88 //generator.Emit(OpCodes.Pop); //是否是 无返回值函数 调用之后，不用弹出堆栈？ 89
90 //return
91 generator.Emit(OpCodes.Ret); //函数执行完成 92
93
94
95
96 //将函数作为 委托
97 VoidNoParamsMethod delegateMethod = (VoidNoParamsMethod)dm.CreateDelegate(typeof(VoidNoParamsMethod)); 98 //执行委托
99 delegateMethod.Invoke(); 100 } 101
102
103 public delegate void VoidNoParamsMethod(); 104 }
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1 class Program 2 { 3 static void Main(string[] args) 4 { 5 TestClass testClass = new TestClass(); 6 testClass.Age = 1234; 7 int age = testClass.Age; 8 Console.WriteLine(age); 9 } 10
11
12
13 } 14
15 public class TestClass 16 { 17 public int Age; 18 }
对应的 ILGenerator.Emit 代码：
1 class Program 2 { 3 static void Main(string[] args) 4 { 5 //.method private hidebysig static void Main(string[] args) cil managed 6 //{ 7 // .entrypoint 8 // // 代码大小 33 (0x21) 9 // .maxstack 2 10 // .locals init ([0] class ComplexSetValue.TestClass testClass, 11 // [1] int32 age) 12 // IL_0000: nop 13 // IL_0001: newobj instance void ComplexSetValue.TestClass::.ctor() 14 // IL_0006: stloc.0 15 // IL_0007: ldloc.0 16 // IL_0008: ldc.i4 0x4d2 17 // IL_000d: stfld int32 ComplexSetValue.TestClass::Age 18 // IL_0012: ldloc.0 19 // IL_0013: ldfld int32 ComplexSetValue.TestClass::Age 20 // IL_0018: stloc.1 21 // IL_0019: ldloc.1 22 // IL_001a: call void [mscorlib]System.Console::WriteLine(int32) 23 // IL_001f: nop 24 // IL_0020: ret 25 //} // end of method Program::Main
26
27 DynamicMethod dm = new DynamicMethod("SetValueMethod", null, new Type[] { /*typeof(object), typeof(object)*/ }, true); 28
29 ILGenerator generator = dm.GetILGenerator(); 30
31 generator.DeclareLocal(typeof(TestClass)); //声明变量
32 generator.DeclareLocal(typeof(int)); //声明变量 33
34 //加载参数1，需要注意的是静态方法Ldarg_0对应的是参数1， 35 //实例方法Ldarg_0对应的是this指针，Ldarg_1对应的是参数1， 36 //即每个实例方法都传递一个隐含的this指针 37
38 //TestClass testClass = new TestClass(); 39 //testClass.Age = 1234; 40 //int age = testClass.Age; 41 //Console.WriteLine(age); 42
43 //TestClass testClass = new TestClass(); 44 //newobj instance void ComplexSetValue.TestClass::.ctor()
45 ConstructorInfo testClassConstructor = typeof (TestClass).GetConstructor(new Type[] {}); 46 generator.Emit(OpCodes.Newobj, testClassConstructor); 47 generator.Emit(OpCodes.Stloc_0); 48
49 //testClass.Age = 1234; 50 //ldloc.0 51 //ldc.i4 0x4d2 //1234 52 //stfld int32 ComplexSetValue.TestClass::Age
53 generator.Emit(OpCodes.Ldloc_0); 54 generator.Emit(OpCodes.Ldc_I4, 1234); 55 FieldInfo fieldInfo = typeof (TestClass).GetField("Age"); 56 generator.Emit(OpCodes.Stfld, fieldInfo); 57
58 //int age = testClass.Age; 59 //ldloc.0 60 //ldfld int32 ComplexSetValue.TestClass::Age 61 //stloc.1
62 generator.Emit(OpCodes.Ldloc_0); 63 generator.Emit(OpCodes.Ldfld, fieldInfo); 64 generator.Emit(OpCodes.Stloc_1); 65
66 //Console.WriteLine(age); 67 //ldloc.0 68 //call void [mscorlib]System.Console::WriteLine(object)
69 generator.Emit(OpCodes.Ldloc_1); 70 MethodInfo writeLineMethodInfo = typeof(Console).GetMethod("WriteLine", new Type[] { typeof(int) }); 71 generator.Emit(OpCodes.Call, writeLineMethodInfo); 72 //generator.EmitCall(OpCodes.Call, writeLineMethodInfo, null); //和上面代码 同意思 73
74 //generator.Emit(OpCodes.Pop); //是否是 无返回值函数 调用之后，不用弹出堆栈？ 75
76 //return
77 generator.Emit(OpCodes.Ret); //函数执行完成 78
79
80 //将函数作为 委托
81 VoidNoParamsMethod delegateMethod = (VoidNoParamsMethod)dm.CreateDelegate(typeof(VoidNoParamsMethod)); 82 //执行委托
83 delegateMethod.Invoke(); 84 } 85 } 86
87 public delegate void VoidNoParamsMethod(); 88
89 public class TestClass 90 { 91 public int Age; 92 }