为什么“abcd".StartsWith(“") 返回true? [英] Why does "abcd".StartsWith("") return true?

问题描述

标题是整个问题.有人能告诉我为什么会发生这种情况吗?

Title is the entire question. Can someone give me a reason why this happens?

推荐答案

是的 - 因为它确实以空字符串开头.实际上，空字符串在逻辑上出现在每对字符之间.

Yes - because it does begin with the empty string. Indeed, the empty string logically occurs between every pair of characters.

这样说吧:你能给开始于"的什么定义排除这种情况?这里有一个简单的开始于"的定义，但没有:

Put it this way: what definition of "starts with" could you give that would preclude this? Here's a simple definition of "starts with" that doesn't:

"如果 x 的第一个 y.Length 字符与 y 匹配，则 x 以 y 开头."

"x starts with y if the first y.Length characters of x match those of y."

替代(等效)定义:

"如果 x.Substring(0, y.Length).Equals(y)，则 x 以 y 开头"

"x starts with y if x.Substring(0, y.Length).Equals(y)"

这篇关于为什么“abcd".StartsWith(“") 返回true?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！