/// <summary>
/// 转全角的函数(SBC case)
/// </summary>
/// <param name="input">任意字符串</param>
/// <returns>全角字符串</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 string ToSBC(string input)
{
    //半角转全角：
    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>
/// 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 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);
}


本文转自94cool博客园博客，原文链接：http://www.cnblogs.com/94cool/archive/2010/02/02/1661758.html，如需转载请自行联系原作者