asp.net 半角全角轉化工具

/// <summary>
/// 轉全角的函數(SBC case)
/// </summary>
/// <param name="input">任意字符串</param>
/// <returns>全角字符串</returns>
///<remarks>
///全角空格為12288，半角空格為32
///其他字符半角(33-126)與全角(65281-65374)的對應關系是：均相差65248
///</remarks>
public string ToSBC(string input)
{
//半角轉全角：
char[] c = input.ToCharArray();
for (int i = 0; i < c.Length; i++)
{
if (c[i] == 32)
{
c[i] = (char) 12288;
continue;
}
if (c[i] < 127)
c[i] = (char) (c[i] + 65248);
}
return new string(c);
}


/// <summary>
/// 轉半角的函數(DBC case)
/// </summary>
/// <param name="input">任意字符串</param>
/// <returns>半角字符串</returns>
///<remarks>
///全角空格為12288，半角空格為32
///其他字符半角(33-126)與全角(65281-65374)的對應關系是：均相差65248
///</remarks>
public 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);
}