日期转换为中文日期

        public static string GetChineseDate(DateTime dateTime,bool usingOldFont=true)
        {
            string resultString = "";
            resultString += GetChineseDate2(dateTime.Year, 1, usingOldFont) + "年" + GetChineseDate2(dateTime.Month, 2, usingOldFont) + "月" + GetChineseDate2(dateTime.Day, 3, usingOldFont) + "日";
            return resultString;
        }

        private static string GetChineseDate2(int val, int type, bool usingOldFont)
        {
            string resultString = "";
            string[] arrConvertValue1 = { "零", "壹", "贰", "叁", "肆", "伍", "陆", "柒", "捌", "玖" };
            string[] arrConvertValue2 = { "〇", "一", "二", "三", "四", "五", "六", "七", "八", "九" };
            string tenStr = usingOldFont ? "拾" : "十";
            char[] arrValue = val.ToString().ToCharArray();
            switch (type)
            { 
                case 1:
                    for (int i = 0; i < arrValue.Length; i++)
                    {
                        resultString +=
                            usingOldFont ? arrConvertValue1[Convert.ToInt16(arrValue[i].ToString())] : arrConvertValue2[Convert.ToInt16(arrValue[i].ToString())];
                    }
                    break;
                case 2:
                    if (val < 10)
                    {
                        resultString +=
                            usingOldFont ? arrConvertValue1[Convert.ToInt16(arrValue[0].ToString())] : arrConvertValue2[Convert.ToInt16(arrValue[0].ToString())];
                    }
                    else
                    {
                        resultString += tenStr;
                        resultString += 
                            usingOldFont ? arrConvertValue1[Convert.ToInt16(arrValue[1].ToString())] : arrConvertValue2[Convert.ToInt16(arrValue[1].ToString())];
                    }
                    break;
                case 3:
                    if (val < 20)
                    {
                        for (int i = 0; i < arrValue.Length; i++)
                        {
                            resultString +=
                                usingOldFont ? arrConvertValue1[Convert.ToInt16(arrValue[i].ToString())] : arrConvertValue2[Convert.ToInt16(arrValue[i].ToString())];
                        }
                    }
                    else 
                    {
                        if (arrValue[1].ToString() == "0")
                        {
                            resultString +=
                                usingOldFont ? arrConvertValue1[Convert.ToInt16(arrValue[0].ToString())] : arrConvertValue2[Convert.ToInt16(arrValue[0].ToString())] + tenStr;
                        }
                        else
                        {
                            resultString +=
                                usingOldFont ? arrConvertValue1[Convert.ToInt16(arrValue[0].ToString())] + tenStr + arrConvertValue1[Convert.ToInt16(arrValue[1].ToString())]
                                : 
                                arrConvertValue2[Convert.ToInt16(arrValue[0].ToString())] + tenStr + arrConvertValue2[Convert.ToInt16(arrValue[1].ToString())];
                        }
                    }
                    break;
            }
            return resultString;
        }