asp.net 半形全形轉化工具

/// <summary>
/// 轉全形的函數(SBC case)
/// </summary>
/// <param name="input">任一字元串</param>
/// <returns>全形字元串</returns>
///<remarks>
///全形空格為12288，半形空格為32
///其他字元半形(33-126)與全形(65281-65374)的對應關係是：均相差65248
///</remarks>
public string ToSBC(string input)
{
//半形轉全形：
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>
/// 轉半形的函數(DBC case)
/// </summary>
/// <param name="input">任一字元串</param>
/// <returns>半形字元串</returns>
///<remarks>
///全形空格為12288，半形空格為32
///其他字元半形(33-126)與全形(65281-65374)的對應關係是：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);
}