將一個基本數據類型轉換爲另一個基本數據類型

using System;
using System.Diagnostics;

namespace Lhyi.Helper
{
    /// <summary>
    /// 將一個基本數據類型轉換爲另一個基本數據類型。
    /// </summary>
    public static class Convert
    {
        #region 常量
        /// <summary>
        /// 每毫米等於的英寸數值
        /// </summary>
        private const float MM_OF_INCH = 0.039370078740157f;

        #endregion

        #region 方法

        #region 對 英寸 的轉換

        /// <summary>
        /// 將毫米轉換爲英寸
        /// </summary>
        /// <param name="mm">毫米</param>
        /// <returns></returns>
        public static float MmToInch(float mm)
        {
            float d = (float)(mm * Convert.MM_OF_INCH);
            return d * 100;
        }

        #endregion

        #region 對 Float 的轉換

        /// <summary>
        /// 將 object 類型轉換爲 float
        /// </summary>
        /// <param name="obj">需要轉換的數值</param>
        /// <remarks>如果轉換失敗，則返回 0</remarks>
        /// <returns></returns>
        public static float ToFloat(object obj)
        {
            float result = 0.0f;
            float.TryParse(obj.ToString(), out result);
            return result;
        }

        #endregion

        #region 對 Int 的轉換

        /// <summary>
        /// 將 object 類型轉換爲 int
        /// </summary>
        /// <param name="obj">需要轉換的數值</param>
        /// <remarks>如果轉換失敗，則返回 0</remarks>
        /// <returns></returns>
        public static int ToInt32(object obj)
        {
            int result = 0;
            Int32.TryParse(obj.ToString(), out result);
            return result;
        }

        /// <summary>
        /// 將 string 類型轉換爲 int
        /// </summary>
        /// <param name="str">需要轉換的數值</param>
        /// <returns>如果轉換失敗，則返回 0</returns>
        public static int ToInt32(string str)
        {
            int result = -1;
            int.TryParse(str, out result);
            return result;
        }

        #endregion

        #region 將 數值 轉換爲中文大寫字符串
        
        /// <summary>
        /// 轉換數字金額主函數（包括小數）
        /// 數字字符串
        /// 轉換成中文大寫後的字符串或者出錯信息提示字符串
        /// </summary>
        public static string ToChineseStr(string str)
        {
            string result = string.Empty;
            try
            {
                if (!Convert.IsDecimal(str))                // 判斷是否爲正整數
                    return result;
                if (Double.Parse(str) > double.MaxValue)    // 判斷數值是否太大
                    return result;

                char sign = '.';                            //小數點
                string[] splitstr = str.Split(sign);        //按小數點分割字符串
                if (splitstr.Length == 1)                   //只有整數部分
                {
                    result = Convert.ToData(str) + "圓整";
                }
                else                                        //有小數部分
                {
                    result = Convert.ToData(splitstr[0]) + "圓";//轉換整數部分
                    result += Convert.ToDecimalStr(splitstr[1]);//轉換小數部分
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Convert.ToChineseStr(string) :: " + ex.Message);
                throw ex;
            }
            return result;
        }

        /// <summary>
        /// 判斷是否是正數字字符串
        /// <remarks>如果是數字，返回true，否則返回false</remarks>
        /// </summary>
        private static bool IsDecimal(string str)
        {
            Decimal d = -1;
            Decimal.TryParse(str, out d);
            if (d < 0)
                return false;
            else
                return true;
        }

        /// <summary>
        /// 轉換數字（整數）
        /// </summary>
        private static string ToData(string str)
        {
            string rstr = "";
            try
            {
                string tmpstr = "";
                int strlen = str.Length;
                if (strlen <= 4)
                {
                    rstr = ToDigit(str);
                }
                else
                {

                    if (strlen <= 8)//數字長度大於四位，小於八位
                    {
                        tmpstr = str.Substring(strlen - 4, 4);//先截取最後四位數字
                        rstr = ToDigit(tmpstr);//轉換最後四位數字
                        tmpstr = str.Substring(0, strlen - 4);//截取其餘數字
                        //將兩次轉換的數字加上萬後相連接
                        rstr = String.Concat(ToDigit(tmpstr) + "萬", rstr);
                        rstr = rstr.Replace("零萬", "萬");
                        rstr = rstr.Replace("零零", "零");

                    }
                    else
                        if (strlen <= 12)//數字長度大於八位，小於十二位
                        {
                            tmpstr = str.Substring(strlen - 4, 4);//先截取最後四位數字
                            rstr = ToDigit(tmpstr);//轉換最後四位數字
                            tmpstr = str.Substring(strlen - 8, 4);//再截取四位數字
                            rstr = String.Concat(ToDigit(tmpstr) + "萬", rstr);
                            tmpstr = str.Substring(0, strlen - 8);
                            rstr = String.Concat(ToDigit(tmpstr) + "億", rstr);
                            rstr = rstr.Replace("零億", "億");
                            rstr = rstr.Replace("零萬", "零");
                            rstr = rstr.Replace("零零", "零");
                            rstr = rstr.Replace("零零", "零");
                        }
                }
                strlen = rstr.Length;
                if (strlen >= 2)
                {
                    switch (rstr.Substring(strlen - 2, 2))
                    {
                        case "佰零": rstr = rstr.Substring(0, strlen - 2) + "佰"; break;
                        case "仟零": rstr = rstr.Substring(0, strlen - 2) + "仟"; break;
                        case "萬零": rstr = rstr.Substring(0, strlen - 2) + "萬"; break;
                        case "億零": rstr = rstr.Substring(0, strlen - 2) + "億"; break;

                    }
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Convert.ToData(string) :: " + ex.Message);
                throw ex;
            }

            return rstr;
        }

        /// <summary>
        /// 轉換數字（小數部分）
        /// </summary>
        private static string ToDecimalStr(string str)
        {
            string result = string.Empty;
            try
            {
                int strlen = str.Length;
                if (strlen == 1)
                {
                    result = Convert.To1Digit(str) + "角";
                }
                else
                {
                    string tmpstr = str.Substring(0, 1);
                    result = Convert.To1Digit(tmpstr) + "角";
                    tmpstr = str.Substring(1, 1);
                    result += Convert.To1Digit(tmpstr) + "分";
                    result = result.Replace("零分", "");
                    result = result.Replace("零角", "");
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Convert.ToDecimalStr(string) :: " + ex.Message);
                throw ex;
            }
            return result;
        }

        /// <summary>
        /// 轉換的字符串（四位以內）
        /// </summary>
        private static string ToDigit(string str)
        {   
            string result = string.Empty;
            try
            {
                switch (str.Length)
                {
                    case 1: result = To1Digit(str); break;
                    case 2: result = To2Digit(str); break;
                    case 3: result = To3Digit(str); break;
                    case 4: result = To4Digit(str); break;
                }
                result = result.Replace("拾零", "拾");
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Convert.ToDigit(string) :: " + ex.Message);
                throw ex;
            }

            return result;
        }

        /// <summary>
        /// 轉換四位數字
        /// </summary>
        private static string To4Digit(string str)
        {
            string result = string.Empty;
            try
            {
                string str1 = str.Substring(0, 1);
                string str2 = str.Substring(1, 1);
                string str3 = str.Substring(2, 1);
                string str4 = str.Substring(3, 1);

                result += Convert.To1Digit(str1) + "仟";
                result += Convert.To1Digit(str2) + "佰";
                result += Convert.To1Digit(str3) + "拾";
                result += Convert.To1Digit(str4);
                result = result.Replace("零仟", "零");
                result = result.Replace("零佰", "零");
                result = result.Replace("零拾", "零");
                result = result.Replace("零零", "零");
                result = result.Replace("零零", "零");
                result = result.Replace("零零", "零");
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Convert.To4Digit(string) :: " + ex.Message);
                throw ex;
            }
            return result;
        }

        /// <summary>
        /// 轉換三位數字
        /// </summary>
        private static string To3Digit(string str)
        {
            string result = string.Empty;
            try
            {
                string str1 = str.Substring(0, 1);
                string str2 = str.Substring(1, 1);
                string str3 = str.Substring(2, 1);
                result += Convert.To1Digit(str1) + "佰";
                result += Convert.To1Digit(str2) + "拾";
                result += Convert.To1Digit(str3);
                result = result.Replace("零佰", "零");
                result = result.Replace("零拾", "零");
                result = result.Replace("零零", "零");
                result = result.Replace("零零", "零");
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Convert.To3Digit(string) :: " + ex.Message);
                throw ex;
            }
            return result;
        }

        /// <summary>
        /// 轉換二位數字
        /// </summary>
        private static string To2Digit(string str)
        {
            string result = string.Empty;
            try
            {
                string str1 = str.Substring(0, 1);
                string str2 = str.Substring(1, 1);

                result += Convert.To1Digit(str1) + "拾";
                result += Convert.To1Digit(str2);
                result = result.Replace("零拾", "零");
                result = result.Replace("零零", "零");
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Convert.To2Digit(string) :: " + ex.Message);
                throw ex;
            }
            return result;
        }

        /// <summary>
        /// 將一位數字轉換成中文大寫數字
        /// </summary>
        private static string To1Digit(string str)
        {
            try
            {
                //"零壹貳叄肆伍陸柒捌玖拾佰仟萬億圓整角分"
                switch (str)
                {
                    case "1": return "壹";
                    case "2": return "貳";
                    case "3": return "叄";
                    case "4": return "肆";
                    case "5": return "伍";
                    case "6": return "陸";
                    case "7": return "柒";
                    case "8": return "捌";
                    case "9": return "玖";
                    default: return "零";
                }
            }
            catch (Exception ex)
            {
                Debug.WriteLine("Convert.To1Digit(string) :: " + ex.Message);
                throw ex;
            }
        }

        #endregion

        #endregion
    }
}