C# 带参数的ILGenerator调用实例方法
我试图构造一个泛型类型的实例,并在该实例上调用一个方法。然后返回方法的结果C# 带参数的ILGenerator调用实例方法,c#,ilgenerator,C#,Ilgenerator,我试图构造一个泛型类型的实例,并在该实例上调用一个方法。然后返回方法的结果 MethodInfo methodInfo = ...; ... var genericType = typeof(GenericType<>).MakeGenericType(typeof(TOutput)); il.Emit(OpCodes.Newobj, genericType.GetConstructor(Type.EmptyTypes)); il.Emit(OpCodes.Ldobj, method
MethodInfo methodInfo = ...;
...
var genericType = typeof(GenericType<>).MakeGenericType(typeof(TOutput));
il.Emit(OpCodes.Newobj, genericType.GetConstructor(Type.EmptyTypes));
il.Emit(OpCodes.Ldobj, methodInfo);
il.Emit(OpCodes.Callvirt, genericeClientHelper.GetMethod("MethodName", new Type[] { typeof(MethodInfo) }));
il.Emit(OpCodes.Ret);
MethodInfo MethodInfo=。。。;
...
var genericType=typeof(genericType).MakeGenericType(typeof(TOutput));
Emit(OpCodes.Newobj,genericType.GetConstructor(Type.EmptyTypes));
il.Emit(opcode.Ldobj,methodInfo);
Emit(OpCodes.Callvirt,genericeClientHelper.GetMethod(“MethodName”,新类型[]{typeof(MethodInfo)}));
发射(操作码Ret);
我一直收到一个“System.BadImageFormatException:”坏的类标记。“”异常
GenericType类如下所示
public class GenericType<T>
{
public T MethodName(MethodInfo methodInfo)
{
...
}
}
公共类GenericType
{
公共T MethodName(MethodInfo MethodInfo)
{
...
}
}
您混淆了生成的程序和生成的程序之间的界限
具体地说,生成程序在运行时会构造一个对象的实例(一个MethodInfo
实例),然后尝试生成一个使用该实例的程序-它不能这样做,因为该实例不存在于生成的程序中,它存在于生成程序的内存中
您必须在生成的程序中构造MethodInfo
的实例-您必须编写Emit代码以生成构造MethodInfo
实例的IL
您尝试做的与执行以下操作一样有意义:
Person person = new Person( "Antiduh", "United States" );
var genericType = typeof(GenericType<>).MakeGenericType(typeof(TOutput));
il.Emit(OpCodes.Newobj, genericType.GetConstructor(Type.EmptyTypes));
// This doesn't make sense. The object referred to by
// my `person` variable doesn't exist in the generated program.
il.Emit(OpCodes.Ldobj, person);
il.Emit(OpCodes.Callvirt, genericeClientHelper.GetMethod("MethodName", new Type[] { typeof(MethodInfo) }));
il.Emit(OpCodes.Ret);
你能给我们看更多的代码吗?比如,您如何构造类型,如何定义方法?您当前的代码看起来不错(虽然
genericeClientHelper.GetMethod
应该是genericType.GetMethod
,但我相信。谢谢你的回答。我知道问题在于MethodInfo在错误的层中,我希望有一种方法可以将它发送到生成的方法中,而不必一块一块地撕掉我需要的数据。
private static void BuildAssembly()
{
AssemblyName assemblyName;
AssemblyBuilder assmBuilder;
ModuleBuilder modBuilder;
assemblyName = new AssemblyName( "Generated" );
// Note the save directory is the directory containing this project's solution file.
assmBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(
assemblyName,
AssemblyBuilderAccess.RunAndSave,
Assembly.GetExecutingAssembly().Location + @"\..\..\..\.."
);
modBuilder = assmBuilder.DefineDynamicModule(
assemblyName.Name,
assemblyName.Name + ".dll",
true
);
/*
* public class GenericsDemo {
* }
*/
TypeBuilder typeBuilder = modBuilder.DefineType(
"Generated.GenericsDemo",
TypeAttributes.Public
);
BuildCallListMethod( typeBuilder );
typeBuilder.CreateType();
assmBuilder.Save( assemblyName.Name + ".dll" );
}
private static void BuildCallListMethod( TypeBuilder typeBuilder )
{
// public void CallList() {
// List<object> list = new List<object>();
// object thing = new object();
// list.Add(thing);
// }
var listOfObject = typeof( List<object> );
var objType = typeof( object );
// public void CallList() {
var method = typeBuilder.DefineMethod(
"CallList",
MethodAttributes.Public | MethodAttributes.HideBySig,
CallingConventions.HasThis
);
var gen = method.GetILGenerator();
// List<int> list;
var listLocal = gen.DeclareLocal( listOfObject );
listLocal.SetLocalSymInfo( "list" );
// object thing;
var thingLocal = gen.DeclareLocal( objType );
thingLocal.SetLocalSymInfo( "thing" );
// list = new List<object>();
gen.Emit( OpCodes.Newobj, listOfObject.GetConstructor( Type.EmptyTypes ) );
gen.Emit( OpCodes.Stloc_0 );
// thing = new object();
gen.Emit( OpCodes.Newobj, objType.GetConstructor( Type.EmptyTypes ) );
gen.Emit( OpCodes.Stloc_1 );
// list.Add( thing );
gen.Emit( OpCodes.Ldloc_0 ); // loads `list`.
gen.Emit( OpCodes.Ldloc_1 ); // loads `thing`.
gen.EmitCall( OpCodes.Callvirt, listOfObject.GetMethod( "Add" ), null );
gen.Emit( OpCodes.Ret );
}