[原创] 用C#将数字转换为人民币大写

网上已经有一些数字转换为人民币大写的源码和控件，但还是自己动手写了一个。一是觉得好玩，二是希望能给需要的朋友提供一些方便：

  1    public class XConvert
  2    {
  3        public static string ToRMB(Double e)
  4        {
  5            return ToRMB(System.Convert.ToDecimal(e));
  6        }
  7
  8        public static string ToRMB(Decimal e)
  9        {
 10            string eString;//数字的格式化字符串
 11            string eNum;//单数字
 12            int eLen;//格式化字符串长度
 13
 14            System.Text.StringBuilder rmb=new System.Text.StringBuilder();//人民币大写
 15            string yuan;//圆
 16            bool seriesZero;//连续0标志
 17            bool minus=false;//负数标志
 18
 19            if (e==0m)
 20            {
 21                return "零圆整";
 22            }
 23            if (e<0m)
 24            {
 25                minus=true;
 26                e=System.Math.Abs(e);                
 27            }
 28            if (e>999999999999.99m)
 29            {
 30                throw new Exception("超过最大范围");
 31            }
 32
 33            eString=e.ToString("0.00");
 34            eLen=eString.Length;
 35            yuan=(eString.Substring(0,1)=="0"?"":"圆");
 36
 37            eNum=eString.Substring(eLen-1,1);//分位
 38            if (eNum=="0")
 39            {
 40                rmb.Append("整");
 41                seriesZero=true;
 42            }
 43            else
 44            {
 45                rmb.Append(stringNum(eNum)+"分");
 46                seriesZero=false;
 47            }
 48
 49            eNum=eString.Substring(eLen-2,1);//角位
 50            if (eNum=="0")
 51            {
 52                if (!seriesZero)
 53                {
 54                    if (!(eLen==4&&eString.Substring(0,1)=="0"))
 55                    {
 56                        rmb.Insert(0,"零");
 57                    }
 58                }
 59            }
 60            else
 61            {
 62                rmb.Insert(0,stringNum(eNum)+"角");            
 63                seriesZero=false;
 64            }
 65
 66            if (eLen<=7)
 67            {
 68                rmb.Insert(0,stringNum4(eString.Substring(0,eLen-3))+yuan);
 69            }
 70            else if (eLen<=11)
 71            {
 72                rmb.Insert(0,stringNum4(eString.Substring(eLen-7,4))+yuan);
 73                rmb.Insert(0,stringNum4(eString.Substring(0,eLen-7))+"万");
 74            }
 75            else if (eLen<=15)
 76            {
 77                rmb.Insert(0,stringNum4(eString.Substring(eLen-7,4))+yuan);
 78                rmb.Insert(0,stringNum4(eString.Substring(eLen-11,4))+(eString.Substring(eLen-11,4)=="0000"?"":"万"));
 79                rmb.Insert(0,stringNum4(eString.Substring(0,eLen-11))+"亿");
 80            }
 81
 82            if (minus) rmb.Insert(0,"负");
 83
 84            return rmb.ToString();
 85        }
 86
 87        private static string stringNum4(string eNum4)
 88        {
 89            string eNum;
 90            bool seriesZero=false;
 91            System.Text.StringBuilder rmb4=new System.Text.StringBuilder();
 92            int eLen=eNum4.Length;
 93
 94            eNum=eNum4.Substring(eLen-1,1);//个位
 95            if (eNum=="0")
 96            {
 97                seriesZero=true;
 98            }
 99            else
100            {
101                rmb4.Append(stringNum(eNum));
102            }
103
104            if (eLen>=2)//十位
105            {
106                eNum=eNum4.Substring(eLen-2,1);
107                if (eNum=="0")
108                {
109                    if (!seriesZero)
110                    {
111                        rmb4.Insert(0,"零");
112                        seriesZero=true;
113                    }
114                }
115                else
116                {
117                    rmb4.Insert(0,stringNum(eNum)+"拾");
118                    seriesZero=false;
119                }
120            }
121
122            if (eLen>=3)//百位
123            {
124                eNum=eNum4.Substring(eLen-3,1);
125                if(eNum=="0")
126                {
127                    if (!seriesZero)
128                    {
129                        rmb4.Insert(0,"零");
130                        seriesZero=true;
131                    }
132                }
133                else
134                {
135                    rmb4.Insert(0,stringNum(eNum)+"佰");
136                    seriesZero=false;
137                }
138            }
139
140            if (eLen==4)//千位
141            {
142                eNum=eNum4.Substring(0,1);
143                if(eNum=="0")
144                {
145                    if (!seriesZero)
146                    {
147                        rmb4.Insert(0,"零");
148                        seriesZero=true;
149                    }
150                }
151                else
152                {
153                    rmb4.Insert(0,stringNum(eNum)+"仟");
154                    seriesZero=false;
155                }
156            }
157
158            return rmb4.ToString();
159        }
160
161        private static string stringNum(string eNum)
162        {
163            switch (eNum)
164            {
165                case "1":
166                    return "壹";
167                case "2":
168                    return "贰";
169                case "3":
170                    return "叁";
171                case "4":
172                    return "肆";
173                case "5":
174                    return "伍";
175                case "6":
176                    return "陆";
177                case "7":
178                    return "柒";
179                case "8":
180                    return "捌";
181                case "9":
182                    return "玖";
183                default:
184                    return "";
185            }
186        }
187｝

不足之处，望朋友们指正。