动态变量转换为动态类型
动态变量转换为动态类型
提问于 2020-03-06 08:06:35
是否可以生成动态类型，以及在方法中使用反射发出的动态变量？动态类型将类似于下面的代码，但使用反射发出创建。
public class MyDynamicType
{
public void MyTests()
{
dynamic MyDynamicVar = 10;
MyDynamicVar = "whatever";
}
}回答 1
Stack Overflow用户
回答已采纳
发布于 2020-03-06 08:22:38
您可以这样做--但这是非常困难的(至少如果您想做任何有用的动态操作，只需为本地变量分配一个值就足够容易了，但我假设您的真正代码会做得更多)。动态类型由C#编译器处理；它没有IL .而Reflection.Emit则主要是生成IL。
所以这段代码：
static void Main()
{
dynamic x = "foo";
dynamic y = x.Substring(1, 2);
}生成以下IL -以及在IL中引用的生成类：
.method private hidebysig static void Main() cil managed
{
.entrypoint
// Code size 109 (0x6d)
.maxstack 9
.locals init (object V_0,
object V_1)
IL_0000: nop
IL_0001: ldstr "foo"
IL_0006: stloc.0
IL_0007: ldsfld class [System.Core]System.Runtime.CompilerServices.CallSite`1<class [mscorlib]System.Func`5<class [System.Core]System.Runtime.CompilerServices.CallSite,object,int32,int32,object>> Program/'<>o__0'::'<>p__0'
IL_000c: brfalse.s IL_0010
IL_000e: br.s IL_0054
IL_0010: ldc.i4.0
IL_0011: ldstr "Substring"
IL_0016: ldnull
IL_0017: ldtoken Program
IL_001c: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle)
IL_0021: ldc.i4.3
IL_0022: newarr [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo
IL_0027: dup
IL_0028: ldc.i4.0
IL_0029: ldc.i4.0
IL_002a: ldnull
IL_002b: call class [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo::Create(valuetype [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfoFlags,
string)
IL_0030: stelem.ref
IL_0031: dup
IL_0032: ldc.i4.1
IL_0033: ldc.i4.3
IL_0034: ldnull
IL_0035: call class [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo::Create(valuetype [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfoFlags,
string)
IL_003a: stelem.ref
IL_003b: dup
IL_003c: ldc.i4.2
IL_003d: ldc.i4.3
IL_003e: ldnull
IL_003f: call class [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo::Create(valuetype [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfoFlags,
string)
IL_0044: stelem.ref
IL_0045: call class [System.Core]System.Runtime.CompilerServices.CallSiteBinder [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.Binder::InvokeMember(valuetype [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpBinderFlags,
string,
class [mscorlib]System.Collections.Generic.IEnumerable`1<class [mscorlib]System.Type>,
class [mscorlib]System.Type,
class [mscorlib]System.Collections.Generic.IEnumerable`1<class [Microsoft.CSharp]Microsoft.CSharp.RuntimeBinder.CSharpArgumentInfo>)
IL_004a: call class [System.Core]System.Runtime.CompilerServices.CallSite`1<!0> class [System.Core]System.Runtime.CompilerServices.CallSite`1<class [mscorlib]System.Func`5<class [System.Core]System.Runtime.CompilerServices.CallSite,object,int32,int32,object>>::Create(class [System.Core]System.Runtime.CompilerServices.CallSiteBinder)
IL_004f: stsfld class [System.Core]System.Runtime.CompilerServices.CallSite`1<class [mscorlib]System.Func`5<class [System.Core]System.Runtime.CompilerServices.CallSite,object,int32,int32,object>> Program/'<>o__0'::'<>p__0'
IL_0054: ldsfld class [System.Core]System.Runtime.CompilerServices.CallSite`1<class [mscorlib]System.Func`5<class [System.Core]System.Runtime.CompilerServices.CallSite,object,int32,int32,object>> Program/'<>o__0'::'<>p__0'
IL_0059: ldfld !0 class [System.Core]System.Runtime.CompilerServices.CallSite`1<class [mscorlib]System.Func`5<class [System.Core]System.Runtime.CompilerServices.CallSite,object,int32,int32,object>>::Target
IL_005e: ldsfld class [System.Core]System.Runtime.CompilerServices.CallSite`1<class [mscorlib]System.Func`5<class [System.Core]System.Runtime.CompilerServices.CallSite,object,int32,int32,object>> Program/'<>o__0'::'<>p__0'
IL_0063: ldloc.0
IL_0064: ldc.i4.1
IL_0065: ldc.i4.2
IL_0066: callvirt instance !4 class [mscorlib]System.Func`5<class [System.Core]System.Runtime.CompilerServices.CallSite,object,int32,int32,object>::Invoke(!0,
!1,
!2,
!3)
IL_006b: stloc.1
IL_006c: ret
} // end of method Program::Main您必须编写Reflection.Emit代码才能自己生成所有IL。我真的真的不认为你想那样做。
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原文链接：
https://stackoverflow.com/questions/60559867
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