未定义'objType'...实际上，为什么会这样呢? [英] 'objType' is not defined... Actually, it is, so why is this happening?

问题描述

如下图所示，由于第二种原因，我的DirectCast不会有任何原因.它说它需要一个类型，但是，它根本不会带任何对象！

As you seen in this picture below, for some reason my DirectCast wont except ANYTHING for the second argument. It says it requires a type, but, it won't take any object at all!

感谢您的帮助！我正在使用VB.net，因此所有.net答案都可以接受:)

Thanks for any help! I'm using VB.net so all .net answers are acceptable :)

编辑

好，所以显然我没有给它正确的type类型.有人可以澄清一下吗?假设需要转换为gridElement的类型，我应该用objType替换什么?

Ok, so apparently I'm not giving it the right kind of type. Could somebody please clarify this? Assuming the type it needs to cast to is gridElement, what should I replace objType with?

推荐答案

DirectCast需要对象原型(即，仅为其提供所需的类名称)，而不是System.Type描述符对象.要使用System.Type投射对象，您将需要利用 CTypeDynamic ():

DirectCast requires an object prototype (i.e. just giving it the intended class name) rather than a System.Type descriptor object. To cast an object using a System.Type, you will want to utilize CTypeDynamic():

Return CTypeDynamic(createElementByIdAndLayer.MemberwiseClone(), objType)

该错误实际上是在告诉您类型名称为"objType"的类不存在.

The error is essentially telling you a class with the type name "objType" does not exist.

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