如果string为null或为空，应该为string.Split(“;")返回什么 [英] what should be returned for string.Split(";") if string is null or empty

问题描述

如果字符串为空或空，

string.split(;")应该不会引发错误?

Shouldn't string.split(";") should throw an error ?

对我来说，我正在尝试这段代码，并且没有任何错误地通过它，

for me I am trying this code and goes through it without any error,

string a = string.empty;

if (a.Split(';').Length - 1 < 1)

谁能告诉我为什么它不会引发错误以及为什么if语句为真.

Can anyone tell me why it not throws an error and why if statement is true.

推荐答案

如果字符串为null，则 .Split()将(显然)抛出 NullReferenceException ，例如任何其他实例方法.

If the string is null, .Split() will (obviously) throw a NullReferenceException, like any other instance method.

如果字符串为空，则 .Split()将返回单个空字符串的数组(除非您传递 StringSplitOptions.RemoveEmptyEntries ).
这是其更普遍(且较少意外)行为的一个特例.如果分隔符没有出现在源字符串的任何地方，它将返回一个包含整个源字符串的数组.

If the string is empty, .Split() will return an array of a single empty string (unless you pass StringSplitOptions.RemoveEmptyEntries).
This is a corner case of its more general (and less unexpected) behavior; if the delimiter does not appear anywhere in the source string, it will return an array containing the entire source string.

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