C#利用字符串方法把八进制数转换为十六进制数

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/// <summary>
 /// 将8进制数转换成16进制数
 /// </summary>
 /// <param name="convertFrom">八进制数</param>
 /// <returns>十六进制数</returns>
 private string ConvertNumber8To16(string convertFrom)
 {
 string check = convertFrom.Replace("0", string.Empty).Replace("1", string.Empty).Replace("2", string.Empty).Replace("3", string.Empty).Replace("4", string.Empty).Replace("5", string.Empty).Replace("6", string.Empty).Replace("7", string.Empty);
 if (check.Length > 0)
 {
 //errorHandle
 return string.Empty;
 }
 string convertTo=string.Empty, convertTo2;//目标数convertTo：将八进制From转换成进制To,
 //convertTo2：选转换成进制数，再转换成十六进制数
 convertTo2 = ConvertNumber8To2(convertFrom);//先转化为二进制
 convertTo = ConvertNumber2To16(convertTo2);
 return convertTo;
 }
 /// <summary>
 /// 将8进制转换为2进制
 /// </summary>
 /// <param name="convertFrom">八进制数</param>
 /// <returns>二进制数</returns>
 private string ConvertNumber8To2(string convertFrom)
 {
 string check = convertFrom.Replace("0", string.Empty).Replace("1", string.Empty).Replace("2", string.Empty).Replace("3", string.Empty).Replace("4", string.Empty).Replace("5", string.Empty).Replace("6", string.Empty).Replace("7", string.Empty);
 if (check.Length > 0)
 {
 //errorHandle
 return string.Empty;
 }
 string convertTo = string.Empty, bit;
 for (int i = convertFrom.Length - 1; i >= 0; i--)
 {
 bit = convertFrom.Substring(i, 1);
 switch (bit)
 {
 case "0":
 convertTo = "000" + convertTo;
 break;
 case "1":
 convertTo = "001" + convertTo;
 break;
 case "2":
 convertTo = "010" + convertTo;
 break;
 case "3":
 convertTo = "011" + convertTo;
 break;
 case "4":
 convertTo = "100" + convertTo;
 break;
 case "5":
 convertTo = "101" + convertTo;
 break;
 case "6":
 convertTo = "110" + convertTo;
 break;
 case "7":
 convertTo = "111" + convertTo;
 break;
 }
 }
 return convertTo;
 }
 /// <summary>
 /// 将2进制转换为16进制
 /// </summary>
 /// <param name="convertFrom">二进制数</param>
 /// <returns>十六进制数</returns>
 private string ConvertNumber2To16(string convertFrom)
 {
 string check = convertFrom.Replace("0", string.Empty).Replace("1", string.Empty);
 if (check.Length > 0)
 {
 //errorHandle
 return string.Empty;
 }
 string convertTo = string.Empty, bit;
 int residue,temp = 0;
 for (int i = convertFrom.Length - 4; i >= 0; i-=4)
 {
 bit = convertFrom.Substring(i, 4);//每次减四
 switch (bit)
 {
 case "0000":
 convertTo = "0" + convertTo;
 break;
 case "0001":
 convertTo = "1" + convertTo;
 break;
 case "0010":
 convertTo = "2" + convertTo;
 break;
 case "0011":
 convertTo = "3" + convertTo;
 break;
 case "0100":
 convertTo = "4" + convertTo;
 break;
 case "0101":
 convertTo = "5" + convertTo;
 break;
 case "0110":
 convertTo = "6" + convertTo;
 break;
 case "0111":
 convertTo = "7" + convertTo;
 break;
 case "1000":
 convertTo = "8" + convertTo;
 break;
 case "1001":
 convertTo = "9" + convertTo;
 break;
 case "1010":
 convertTo = "A" + convertTo;
 break;
 case "1011":
 convertTo = "B" + convertTo;
 break;
 case "1100":
 convertTo = "C" + convertTo;
 break;
 case "1101":
 convertTo = "D" + convertTo;
 break;
 case "1110":
 convertTo = "E" + convertTo;
 break;
 case "1111":
 convertTo = "F" + convertTo;
 break;
 }
 } 
 residue = convertFrom.Length % 4;//求余数
 if (residue != 0)
 {
 for (int i = 0; i < residue; i++)
 {
 temp += Convert.ToInt32(convertFrom.Substring(i, 1))
 * Convert.ToInt32(Math.Pow(2, residue - i - 1));
 }
 }
 if (temp != 0)
 {
 convertTo = temp.ToString() + convertTo;
 }
 return convertTo;
 }

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