布尔表达式-操作顺序 [英] Boolean Expression - Order of Operations

问题描述

我在Excel VBA中进行了测试:

I have a test in Excel VBA:

If (test1) And (test2) And (test3) Then
    'do something
End If

在C，Java等环境中，首先运行test1，然后运行test2，然后运行test3.至关重要的是，如果test1为false，则整个测试为false，因此其余测试不会运行.

In C, Java, etc. test1 would be run first, then test2, then test3. Critically, if test1 is false the whole test is false so the remaining tests do not run.

在这种情况下，使用VBA是否会发生这种情况?如果是这样，测试按什么顺序运行?

Does that happen in this case with VBA? If so, in which order are the tests running?

推荐答案

.NET之前的所有VB中都没有短路之类的东西.即使不需要，也会对所有表达式求值.如果您想短期学习，请嵌套IF.

In all VBs prior to .NET there is no such thing as short-circuit. All expressions will be evaluated even if not required. If you want short-curcuit, do nested IFs.

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