如果(Array.Length == 0) [英] If (Array.Length == 0)

问题描述

如果数组为空，则似乎无法使用".length"检查其长度.检查数组是否为空的最佳方法是什么?

If an array is empty, it looks like you can't check it's length using ".length". What's the best way to check if an array is empty?

推荐答案

您可以绝对检查空数组的长度.但是，如果您尝试对null引用执行此操作，则会得到异常.我怀疑这就是您遇到的问题.您可以同时解决这两个问题:

You can absolutely check an empty array's length. However, if you try to do that on a null reference you'll get an exception. I suspect that's what you're running into. You can cope with both though:

if (array == null || array.Length == 0)

如果不是这个原因，请给出一个简短但完整的程序来说明问题.如果是 原因，值得花一点时间来确保您了解空引用与空"集合/字符串/任何内容.

If that isn't the cause, please give a short but complete program demonstrating the problem. If that was the cause, it's worth taking a moment to make sure you understand null references vs "empty" collections/strings/whatever.

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