经典的属性设置!
今天无意中在一个老外的博客里看到了属性的经典设置,尤其是在Set属性时所做的判断那是相当的经典,至少是我见到的经典,也许是我见识太少了.
,他在里面用到了其他基本数据类型的TryParse()方法是很经典.不卖官子了,下面是代码:
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public class TransactionRequestInfo
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{
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public string FirstName { get; set; }
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public string LastName { get; set; }
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public string Address { get; set; }
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public string City { get; set; }
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public string State { get; set; }
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public string Country { get; set; }
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public string Description { get; set; }
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private decimal _amount;
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public decimal ChargeAmount
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{
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get
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{
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return _amount;
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}
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set
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{
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_amount = Decimal.Round(value, 2);
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}
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}
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private string _zip;
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public string Zip
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{
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get
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{
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return _zip;
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}
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set
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{
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int res;
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if (int.TryParse(value, out res))
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{
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if (res > 99999)
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{
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throw new ArgumentException("Zip Code Value invalid");
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}
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else
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{
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_zip = res.ToString().PadLeft(5, ‘0′);
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}
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}
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else
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{
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throw new ArgumentException("Zip code must be numeric");
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}
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}
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}
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private string _securityCode;
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public string SecurityCode
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{
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get
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{
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return _securityCode;
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}
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set
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{
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int res;
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if (int.TryParse(value, out res))
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{
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if (res > 999)
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{
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throw new ArgumentException("Security Code Value invalid");
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}
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else
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{
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_securityCode = res.ToString().PadLeft(3, ‘0′);
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}
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}
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else
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{
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throw new ArgumentException("Security code must be numeric");
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}
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}
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}
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private string _cardNumber;
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public string CardNumber
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{
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get
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{
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return _cardNumber;
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}
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set
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{
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long res;
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if (long.TryParse(value, out res))
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{
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_cardNumber = res.ToString();
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}
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else
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{
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throw new ArgumentException("Card Number may only contain numbers");
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}
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}
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}
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private string _expDate;
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public string ExpDate
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{
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get
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{
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return _expDate;
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}
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set
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{
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int res;
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if (int.TryParse(value, out res))
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{
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string exp = res.ToString().PadLeft(4, ‘0′);
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int month = int.Parse(exp.Substring(0, 2));
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int yr = int.Parse(exp.Substring(2, 2));
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if (yr > DateTime.Now.Year ||
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(yr == DateTime.Now.Year && month >= DateTime.Now.Month))
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{
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_expDate = month.ToString().PadLeft(2, ‘0′) +
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"/" + yr.ToString().PadLeft(2, ‘0′);
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}
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else
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{
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throw new ArgumentException("Expiration Date already passed");
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}
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}
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else
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{
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throw new ArgumentException("Expiration Date must be numeric");
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}
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}
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}
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}
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