C#中Char.IsDigit()和Char.IsNumber()的区别 [英] Difference between Char.IsDigit() and Char.IsNumber() in C#

问题描述

C#中Char.IsDigit()和Char.IsNumber()有什么区别?

推荐答案

Char.IsDigit() 是 Char.IsNumber() 的子集.

一些数字"但不是数字的字符包括 0x00b2 和 0x00b3，它们是上标 2 和 3(²"和³")以及作为分数的字形，例如¼"、½"，和'¾'.

Some of the characters that are 'numeric' but not digits include 0x00b2 and 0x00b3 which are superscripted 2 and 3 ('²' and '³') and the glyphs that are fractions such as '¼', '½', and '¾'.

请注意，IsDigit() 返回true 的字符很多，因为它们不在 0x30 到 0x39 的 ASCII 范围内，例如这些泰语数字字符: '๐' '๑' '๒' '๓' '๔' '๕' '๖' '๗' '๘' '๙'.

Note that there are quite a few characters that IsDigit() returns true for that are not in the ASCII range of 0x30 to 0x39, such as these Thai digit characters: '๐' '๑' '๒' '๓' '๔' '๕' '๖' '๗' '๘' '๙'.

这段代码告诉您哪些代码点不同:

This snippet of code tells you which code points differ:

static private void test()
{
    for (int i = 0; i <= 0xffff; ++i)
    {
        char c = (char) i;

        if (Char.IsDigit( c) != Char.IsNumber( c)) {
            Console.WriteLine( "Char value {0:x} IsDigit() = {1}, IsNumber() = {2}", i, Char.IsDigit( c), Char.IsNumber( c));
        }
    }
}

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