任何数字转换为中文货币类型

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/// </summary>  
  /// <param name="str">数字字符串</param>  
  /// <returns>转换成中文大写后的字符串或者出错信息提示字符串</returns>  
  public string ConvertSum(string str) 
  { 
      if (!IsPositveDecimal(str)) 
          return "输入的不是正数字！"; 
      if (Double.Parse(str) > 999999999999.99) 
          return "数字太大，无法换算，请输入一万亿元以下的金额"; 
      char[] ch = new char[1]; 
      ch[0] = '.'; //小数点  
      string[] splitstr = null; //定义按小数点分割后的字符串数组  
      splitstr = str.Split(ch[0]);//按小数点分割字符串  
      if (splitstr.Length == 1) //只有整数部分  
          return ConvertData(str) + "圆整"; 
      else //有小数部分  
      { 
          string rstr; 
          rstr = ConvertData(splitstr[0]) + "圆";//转换整数部分  
          rstr += ConvertXiaoShu(splitstr[1]);//转换小数部分  
          return rstr; 
      } 
 
  } 
  /// <summary>  
  /// 判断是否是正数字字符串  
  /// </summary>  
  /// <param name="str"> 判断字符串</param>