C#实现阿拉伯数字转换为汉字数字

项目中用到，保存下来为日后用到节约时间

公共方法(将单个数字转换为汉字)

 private char ToNum(char x)
        {
            string strChnNames = "零一二三四五六七八九";
            string strNumNames = "0123456789";
            return strChnNames[strNumNames.IndexOf(x)];
        } 

1、转换为为整数（最高位数为亿）

 private string ChangeInt(string x)
 {
 string[] strArrayLevelNames=new string[4] {"","十","百","千"};
 string ret = "";
 int i;
 for (i=x.Length-1;i>=0;i--)
 if (x[i] == ‘0‘)
  ret = ToNum(x[i]) + ret;
 else
  ret = ToNum(x[i]) + strArrayLevelNames[x.Length-1-i] + ret;
 while ((i=ret.IndexOf("零零"))!=-1)
 ret=ret.Remove(i, 1);
 if (ret[ret.Length-1]==‘零‘ && ret.Length>1)
 ret=ret.Remove(ret.Length-1,1);
 if (ret.Length>=2 && ret.Substring(0,2)=="一十")
 ret=ret.Remove(0,1);
 return ret;
 } 

 // 转换整数
 private string ToInt(string x)
 {
 int len = x.Length;
 string ret,temp;
 if (len<=4)
 ret = ChangeInt(x);
 else if (len<=8)
 {
 ret = ChangeInt(x.Substring(0,len-4)) + "万";
 temp = ChangeInt(x.Substring(len-4,4));
 if (temp.IndexOf("千")==-1 && temp!="")
  ret += "零" + temp;
 else
  ret += temp;
 }
 else
 {
 ret=ChangeInt(x.Substring(0,len-8)) + "亿";
 temp=ChangeInt(x.Substring(len-8,4));
 if (temp.IndexOf("千")==-1 && temp!="")
  ret += "零" + temp;
 else
  ret += temp;
 ret += "万";
 temp = ChangeInt(x.Substring(len-4,4));
 if (temp.IndexOf("千")==-1 && temp!="")
  ret += "零" + temp;
 else
  ret += temp;
 }
 int i;
 if ((i=ret.IndexOf("零万"))!=-1)
 ret = ret.Remove(i+1,1);
 while ((i=ret.IndexOf("零零"))!=-1)
 ret = ret.Remove(i,1);
 if (ret[ret.Length-1]==‘零‘ && ret.Length>1)
 ret = ret.Remove(ret.Length-1,1);
 return ret;
 }
 

2、转换为小数

private string ToDecimal(string x)
 {
 string ret="";
 for (int i=0;i<x.Length;i++)
 ret += ToNum(x[i]);
 return ret;
 } 

 public string NumToChn(string x)
 {
 if (x.Length==0)
 return "";
 string ret="";
 if (x[0]==‘-‘)
 {
 ret="负";
 x=x.Remove(0,1);
 }
 if (x[0].ToString()==".")
 x="0"+x;
 if (x[x.Length-1].ToString()==".")
 x=x.Remove(x.Length-1,1);
 if (x.IndexOf(".")>-1)
 ret += ToInt(x.Substring(0,x.IndexOf(".")))+"点"+ToDecimal(x.Substring(x.IndexOf(".")+1));
 else
 ret += ToInt(x);
 return ret;
 }