快速案例不敏感字符串比较 [英] Fast Case Insensitive String Comparisons

问题描述

使用.ToUpper（）执行不区分大小写的有什么替代方法

字符串比较？


我问的原因是我我在长循环中比较字符串，看起来是平等的
;我希望这个循环尽可能快地运行。所以我是
寻找一种比.ToUpper（）更快的方法。


谢谢！

What are some alternatives to using .ToUpper() to perform case insensitive
string comparisons?

The reason I''m asking is that I''m comparing strings in a long loop, looking
for equality; and I want for this loop to run as fast as possible. So I''m
looking for a method that would be faster than .ToUpper().

Thanks!

推荐答案

您是否尝试在.Compare方法中指定不区分大小写？


Merk写道：

Did you try specifying case insensitivity in the .Compare method?

Merk wrote:

使用.ToUpper（）执行不区分大小写的有哪些替代方法

字符串比较？


我问的原因是我在长循环中比较字符串，看起来是平等的
;我希望这个循环尽可能快地运行。所以我是
寻找一种比.ToUpper（）更快的方法。


谢谢！

What are some alternatives to using .ToUpper() to perform case insensitive
string comparisons?

The reason I''m asking is that I''m comparing strings in a long loop, looking
for equality; and I want for this loop to run as fast as possible. So I''m
looking for a method that would be faster than .ToUpper().

Thanks!

在2.0，IIRC，从测试（现已删除）我相信

string.Equals（lhs，rhs，ComparerOptions .OrdinalIgnoreCase）是最快的
。


你也可以使用StringComparer.OrdinalIgnoreCase.Equals（...）但是我

相信这有点慢。


最好的办法是在紧凑的循环中尝试每个选项进行测试;

你可以尝试：


lhs.ToUpper（）== rhs.ToUpper（）

lhs.Equals（rhs，StringComparison.OrdinalIgnoreCase）; //或

InvariantCultureIgnoreCase

string.Equals（lhs，rhs，StringComparison.OrdinalIgnoreCase）//或

InvariantCultureIgnoreCase


StringComparer.OrdinalIgnoreCase.Equals（lhs，rhs）; //或不变的情况

不敏感


等


Marc

In 2.0, IIRC, from tests (now deleted) I believe that
string.Equals(lhs,rhs, ComparerOptions.OrdinalIgnoreCase) is the
fastest.

You can also use StringComparer.OrdinalIgnoreCase.Equals(...) but I
beleive that this is a little slower.

Your best bet is to try every option in a tight loop to test;
you could try:

lhs.ToUpper() == rhs.ToUpper()

lhs.Equals(rhs, StringComparison.OrdinalIgnoreCase); // or
InvariantCultureIgnoreCase

string.Equals(lhs, rhs, StringComparison.OrdinalIgnoreCase) // or
InvariantCultureIgnoreCase

StringComparer.OrdinalIgnoreCase.Equals(lhs, rhs); // or invariant case
insensitive

etc

Marc

ComparerOptions.OrdinalIgnoreCase

我的意思是StringComparison.OrdinalIgnoreCase，但intellisense会有

告诉你......


Marc

ComparerOptions.OrdinalIgnoreCase
I meant StringComparison.OrdinalIgnoreCase, but intellisense would have
told you that...

Marc

这篇关于快速案例不敏感字符串比较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！