字符串比较？ [英] String Comparison?

问题描述

可能重复：结果
的 string中的差异比较C＃方法

是否有这些方法有什么区别？

Is there any difference between these methods?

string.Compare(s1, s2) == 0
s1.CompareTo(s2) == 0
s1.Equals(s2)
s1 == s2

$ b $ 2 b

我应该使用哪种

Which one should I use?

推荐答案

从反射：

public static int Compare(string strA, string strB)
{
    return CultureInfo.CurrentCulture.CompareInfo.Compare(strA, strB, CompareOptions.None);
}
public int CompareTo(string strB)
{
    if (strB == null)
    {
        return 1;
    }
    return CultureInfo.CurrentCulture.CompareInfo.Compare(this, strB, CompareOptions.None);
}

所以的CompareTo 有额外的参考检查比比较。

So CompareTo has an additional reference check than Compare.

public static bool operator ==(string a, string b)
{
    return Equals(a, b);
}

所以 == 是完全一样的等于。
两个比较和两个等于是，你可以通过 CompareOptions之间的区别参数比较，并返回0/1 / -1。而等于没有收到 CompareOptions 参数，它可以告诉你TRUE / FALSE仅

So == is exactly the same as Equals. The difference between two Compare and two Equals is, you can pass CompareOptions argument to Compare, and it returns 0/1/-1. while Equals doesn't receive a CompareOptions argument, and it can tell you TRUE/FALSE only.

这篇关于字符串比较？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！