c# 字符串中全角和半角字符互转

public class ConvertDBCAndSBC
{

/// <summary>半角转成全角
/// 半角空格32,全角空格12288
/// 其他字符半角33~126,其他字符全角65281~65374,相差65248
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string DBCToSBC(string input)
{
char[] cc = input.ToCharArray();
for (int i = 0; i < cc.Length; i++)
{
if (cc[i] == 32)
{
// 表示空格
cc[i] = (char)12288;
continue;
}
if (cc[i] < 127 && cc[i] > 32)
{
cc[i] = (char)(cc[i] + 65248);
}
}
return new string(cc);
}

/// <summary>全角转半角
/// 半角空格32,全角空格12288
/// 其他字符半角33~126,其他字符全角65281~65374,相差65248
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
public static string SBCToDBC(string input)
{
char[] cc = input.ToCharArray();
for (int i = 0; i < cc.Length; i++)
{
if (cc[i] == 12288)
{
// 表示空格
cc[i] = (char)32;
continue;
}
if (cc[i] > 65280 && cc[i] < 65375)
{
cc[i] = (char)(cc[i] - 65248);
}

}
return new string(cc);
}
}