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.
这篇关于未定义'objType'...实际上，为什么会这样呢?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！