Reflection.Emit的：如何转换MethodBuilder可靠RuntimeMethodInfo？ [英] Reflection.Emit: How to convert MethodBuilder to RuntimeMethodInfo reliably?

问题描述

动态生成类型并调用TypeBuilder.CreateType后，我想创建一个委托指向新类型的方法。但是，如果我用code像

  loadedType = typeBuilder.CreateType（）;
myDelegate =（MyDelegate）Delegate.CreateDelegate（
                                  typeof运算（MyDelegate），methodBuilder）;
 

重用methodBuilder作为MethodInfo的，我得到的异常的MethodInfo必须是一个RuntimeMethodInfo。现在通常我可以重新获得的MethodInfo与

  MethodInfo的MI = loadedType.GetMethod（methodBuilder.Name）;
myDelegate =（MyDelegate）Delegate.CreateDelegate（typeof运算（MyDelegate），MI）;
 

不过，我的课可能包含多个同名的重载方法。我如何确保我得到正确的？ do方法有一定持续性的标识符，我可以看看在loadedType？

更新：好吧，这里是我用什么来重新获得的MethodInfo。我只是希望我可以肯定它适用于所有的情况。

 私有静态的MethodInfo ReacquireMethod（类型类型，MethodInfo的方法）
{
    的BindingFlags标志= BindingFlags.DeclaredOnly;
    旗帜| =（？method.IsPublic BindingFlags.Public：BindingFlags.NonPublic可）;
    旗帜| =（？method.IsStatic BindingFlags.Static：BindingFlags.Instance）;
    MethodInfo的M = type.GetMethod（method.Name，标志，空，
                                          ParameterTypes（方法），NULL）;
    Debug.Assert的（M！= NULL）;
    返回米;
}
 

解决方案

据我所知没有永久共享标识符。

方法的重载通过其参数列表区分开来，所以我的猜测是，你需要调用<一个href="http://msdn.microsoft.com/en-us/library/system.reflection.emit.methodbuilder.getparameters.aspx"相对=nofollow> GetParameters 对 methodBuilder 然后再翻译回来信息参数[] 阵列成键入[] 数组传递给了的相应的 GetMethod的超载：

  MethodInfo的MI = loadedType.GetMethod（
    methodBuilder.Name，
    。methodBuilder.GetParameters（）选择（P =＆GT; p.ParameterType）.ToArray（））;
 

After generating a type dynamically and calling TypeBuilder.CreateType, I want to create a delegate that points to a method in the new type. But if I use code like

loadedType = typeBuilder.CreateType();
myDelegate = (MyDelegate)Delegate.CreateDelegate(
                                  typeof(MyDelegate), methodBuilder);

Reusing the methodBuilder as a methodInfo, I get the exception "MethodInfo must be a RuntimeMethodInfo". Now normally I can re-acquire the MethodInfo with

MethodInfo mi = loadedType.GetMethod(methodBuilder.Name);
myDelegate = (MyDelegate)Delegate.CreateDelegate(typeof(MyDelegate), mi);

But my class may contain several overloaded methods with the same name. How do I make sure I get the right one? Do methods have some persistent identifier I could look up in loadedType?

Update: okay, here's what I'm using to re-acquire the MethodInfo. I just wish I could be sure it works in all cases.

private static MethodInfo ReacquireMethod(Type type, MethodInfo method)
{
    BindingFlags flags = BindingFlags.DeclaredOnly;
    flags |= (method.IsPublic ? BindingFlags.Public : BindingFlags.NonPublic);
    flags |= (method.IsStatic ? BindingFlags.Static : BindingFlags.Instance);
    MethodInfo m = type.GetMethod(method.Name, flags, null,
                                          ParameterTypes(method), null);
    Debug.Assert(m != null);
    return m;
}

解决方案

As far as I'm aware there's no persistent shared identifier.

Overloads of a method are distinguished by their parameter lists, so my guess is that you'll need to call GetParameters on methodBuilder and then translate the returned ParameterInfo[] array into a Type[] array to pass to the the appropriate GetMethod overload:

MethodInfo mi = loadedType.GetMethod(
    methodBuilder.Name,
    methodBuilder.GetParameters().Select(p => p.ParameterType).ToArray());

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