将字符串中的全角字符转换为半角字符

 1         /// <summary>
 2         /// 将字符串中的全角字符转换为半角字符
 3         /// </summary>
 4         /// <param name="source">字符串</param>
 5         /// <returns></returns>
 6         public static string ConvertStringToNarrow(string source)
 7         {
 8             StringBuilder result = new StringBuilder(source.Length, source.Length);
 9             for (int i = 0; i < source.Length; i++)
10             {
11                 if (source[i] == 12288)
12                 {
13                     result.Append(' ');
14                 }
15                 else if (source[i] == 12290)
16                 {
17                     result.Append('.');
18                 }
19                 else if (source[i] >= 65281 && source[i] <= 65374)
20                 {
21                     result.Append((char)(source[i] - 65248));
22                 }
23                 else
24                 {
25                     result.Append(source[i]);
26                 }
27             }
28             return result.ToString();
29         }