Question

我的代码是：

 string dex = "ABCD1234";
 string ch = "C";
 string ch1, ch2;
    if (dex.Contains(ch))
    {
       string n = Convert.ToChar(dex);
       MessageBox.Show(ch + "  is on " + n + " place and is between " + ch1 + " and " + ch2);
    }

我想将字符串转换为数组，但我不能这样做，我无法检索'ch'字符串的位置以及它之间的内容。

输出应为：

MessageBox.Show("C is on 3rd place and is between B and D");

Answer 1

string aS = "ABCDEFGHI";
char ch = 'C';
int idx = aS.IndexOf(ch);
MessageBox.Show(string.Format("{0} is in position {1} and between {2} and {3}", ch.ToString(), idx + 1, aS[idx - 1], aS[idx + 1]));

如果你的角色处于零位和其他一些条件下，你将无法解决这个问题。

Answer 2

您可能需要read the documentation on System.String及其方法和属性：

您想要的方法是IndexOf()：

string s = "ABCD1234" ;
char   c = 'C' ;

int offset = s.IndexOf(c) ;
bool found = index >= 0 ;
if ( !found )
{
  Console.WriteLine( "string '{0}' does not contain char '{1}'" , s , c ) ;
}
else
{
  string prefix = s.Substring(0,offset) ;
  string suffix = s.Substring(offset+1) ;

  Console.WriteLine( "char '{0}' found at offset +{1} in string '{2}'." , c , offset , s ) ;
  Console.WriteLine( "The substring before it is '{0}'."             , prefix ) ;
  Console.WriteLine( "The substring following it is '{0}'."          , suffix ) ;

}

C＃从字符串中获取字符的位置

2 个答案: