关于全角转半角的方法[转]

代码

/// <summary>
/// 替换全角字符为半角
/// </summary>
/// <returns></returns>
public static string ReplaceSBC2DBC(string input)
{
// 全角正则
string pattern = @"[\uFF00-\uFFFF]";
string result = Regex.Replace(input, pattern, new MatchEvaluator(delegate(Match match)
{
return ToDBC(match.Value);
}), RegexOptions.Compiled | RegexOptions.IgnoreCase);

return result;
}

/// <summary>
/// 转半角的函数(DBC case)
/// </summary>
/// <param name="input">任意字符串</param>
/// <returns>半角字符串</returns>
///<remarks>
///全角空格为12288，半角空格为32
///其他字符半角(33-126)与全角(65281-65374)的对应关系是：均相差65248
///</remarks>
public static string ToDBC(string input)
{
char[] c = input.ToCharArray();
for (int i = 0; i < c.Length; i++)
{
if (c[i] == 12288)
{
c[i] = (char)32;
continue;
}
if (c[i] > 65280 && c[i] < 65375)
c[i] = (char)(c[i] - 65248);
}
return new string(c);
}