1.Length --取字符串长度
string x = Console.ReadLine();
int i = x.Length;
Console.WriteLine(i);
执行结果:
2.Substring(从哪一位开始,截取几位) --截取字符串,从第六位往后截取3位,包括空格在内
string x = Console.ReadLine();
string p = x.Substring(6, 3);
Console.WriteLine(p);
执行结果:
(1) 取字符串的前i个字符
str=str.Substring(0,i); // 或 str=str.Remove(i,str.Length-i);
(2) 去掉字符串的前i个字符:
str=str.Remove(0,i); // 或 str=str.Substring(i);
(3)从右边开始取i个字符:
str=str.Substring(str.Length-i); // 或 str=str.Remove(0,str.Length-i);
(4)从右边开始去掉i个字符:
str=str.Substring(0,str.Length-i); // 或str=str.Remove(str.Length-i,i);
(5)截取字符串最后一个字符的问题
str1.Substring(str1.LastIndexOf(",")+1);
或k = k.Substring(k.Length-1, 1);
3.Trim() --压缩前后空格 TrimStart():压缩前面空格 TrimEnd():压缩后面空格
string x = Console.ReadLine();
int i = x.Length;
Console.WriteLine(i);
string s = x.Trim();
Console.WriteLine(s);
int p = s.Length;
Console.WriteLine(p);
执行结果:
4.ToLower()所有大写都转成小写
ToUpper()所有小写都转成大写
string x = Console.ReadLine();
x = x.ToLower();
Console.WriteLine(x);
x = x.ToUpper();
Console.WriteLine(x);
执行结果:
5.Replace("被替换的","替换为") --替换字符 (前面是被替换的,后面是替换成的)
string x = Console.ReadLine();
string p = x.Replace("a", "A");
Console.WriteLine(p);
执行结果:
6.Remove(从哪一位开始,删除几位) --删除字符
string x = Console.ReadLine();
x=x.Remove(5,3);
Console.WriteLine(x);
执行结果:
7.Split(Char[]) --分隔字符串
string words = "This is a list of words, with: a bit of punctuation" +
" and a tab character.";
string[] str = words.Split(new Char[] { ' ', ',', '.', ':', ' ' });
foreach (string s in str)
{
if (s.Trim() != "")
Console.WriteLine(s);
}
执行结果: