Question

我刚刚看到以下片段：

Public Function Checked() As Boolean
      Return applyChange  This is a string!
End Function

这是怎么回事？返回类型为Boolean的函数如何实际返回字符串？我假设这里有一些隐含的转换，我宁愿没有。我是否缺少编译选项？

这是.NET 1.0。

Answer 1

您错过了Option Strict编译选项。您可以在项目的“属性”窗口中的“编译”选项卡下找到它。打开它后，会出现以下错误：

And I suggest turning this option on immediately and fixing all resulting compilation errors. Converting from a String to a Boolean is a risky proposition. In the event that applyChange is actually set to a string like "Hello" (instead of "True" or "False"), you ll get the following run-time error:

从字符串“Hello”到类型Boolean的转换无效。

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