Activator.CreateInstance私人密封类 [英] Activator.CreateInstance with private sealed class

问题描述

我想新的一个LocalCommand实例，它是一个私有的类System.Data.SqlClient.SqlCommandSet的。我似乎能够抓住类型的信息就好了：

I'm trying to new up a LocalCommand instance which is a private class of System.Data.SqlClient.SqlCommandSet. I seem to be able to grab the type information just fine:

Assembly sysData = Assembly.Load("System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089");
localCmdType = sysData.GetType("System.Data.SqlClient.SqlCommandSet+LocalCommand");

但是当我尝试初始化它Activator.CreateInstance抛出一个异常：

but Activator.CreateInstance throws an exception when I try to instantiate it:

object item = Activator.CreateInstance(localCmdType,
  new object[] { commandText, parameters, num7, commandType });

System.MissingMethodException：构造上键入'System.Data.SqlClient.SqlCommandSet + LocalCommand'未找到

System.MissingMethodException: Constructor on type 'System.Data.SqlClient.SqlCommandSet+LocalCommand' not found.

构造函数的参数匹配我的反射看到了签名。是new'ing了一个私有类与不同的CreateInstance超载或者什么支持的内部构造函数？

The constructor arguments match the signature I see in Reflector. Is new'ing up a private class with an internal ctor supported with a different CreateInstance overload or what?

推荐答案

我首先想到的是将获得 ConstructorInfo 使用 ConstructorInfo constructorInfo =类型.GetConstructor（），然后 constructorInfo.Invoke（）这一点。我怀疑 Activator.CreateInstance 使它难以调用构造函数，你就不能正常访问，虽然我不记得想我自己。

My first thought would be to get the ConstructorInfo using ConstructorInfo constructorInfo = Type.GetConstructor(), and then constructorInfo.Invoke() that. I suspect that Activator.CreateInstance makes it hard to call constructors you wouldn't normally have access to, although I don't remember trying it myself.

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