什么是C＃等价的CType在VB.NET？ [英] What is the C# equivalent of CType in VB.NET?

问题描述

我正在尝试转换此MSDN文章（ http：/ /msdn.microsoft.com/en-us/library/aa479330.aspx ）到C＃，但被困在以下代码：

I am trying to convert the example provided in this MSDN article (http://msdn.microsoft.com/en-us/library/aa479330.aspx) to C#, but am stuck at the following code:

CType(dq, IUIBuildingBlock).QuestionText = reader("QuestionText")

推荐答案

在C＃中，可以有任何C＃guru在上面的VB.NET语句转换为C＃您可以通过将要转换的类型放在括号中要转换的引用变量前面（（type）instance ）来指定转换。

In C#, you can specify a cast by putting the type you want to cast to in parenthesis in front of the reference variable that you want to cast ((type)instance).

因此，要将对象（ dq ）转换为类型 IUIBuildingBlock ，您可以使用以下代码：

So, to cast the object (dq) to the type IUIBuildingBlock, you could use the following code:

((IUIBuildingBlock)dq).QuestionText = reader("QuestionText");

（注意，如果转换是在一个没有实现的对象上完成的， IUIBuildingBlock ，但是 CType ，所以我认为这不是问题。）

(Note that this will throw an exception if the cast is done on an object that doesn't implement IUIBuildingBlock, but so will CType, so I assume that is not a problem.)

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