c# - 计算文本中的字符和单词，是否可以对其进行优化？

Question

我想用大文本计算字符数，我用以下代码完成：

string s = textBox.Text;
int chars = 0;
int words = 0;

foreach(var v in s.ToCharArray())
    chars++;

foreach(var v in s.Split(' '))
    words++;

此代码有效，但使用大文本时似乎很慢，所以我该如何改善呢？

Answer 1

您不需要其他字符数组，可以直接使用String.Length：

int chars = s.Length;
int words = s.Split().Length; 

旁注：如果不带参数调用 String.Split，则所有 white-space characters都用作分隔符。其中包括空格，制表符和换行符。这不是可能的单词定界符的完整列表，但比 " "更好。

您还将连续的空格算作不同的“单词”。使用 StringSplitOptions.RemoveEmptyEntries：

string[] wordSeparators = { "\r\n", "\n", ",", ".", "!", "?", ";", ":", " ", "-", "/", "\\", "[", "]", "(", ")", "<", ">", "@", "\"", "'" }; // this list is probably too extensive, tim.schmelter@myemail.com would count as 4 words, but it should give you an idea
string[] words = s.Split(wordSeparators, StringSplitOptions.RemoveEmptyEntries);
int wordCount = words.Length;