[英]Store data in array, object, struct, list or class. C#
我想制作一個存儲phones
的程序:
Brand: Samsung
Type: Galaxy S3
Price: 199.95
Ammount: 45
-------------------
Brand: LG
Type: Cookie
Price: 65.00
Ammount: 13
-------------------
etc, etc, etc,
這樣做的最佳做法是什么?
在php
我應該做的:
$phones = array(
array(
array("Brand" => "Samsung"),
array("Type" => "Galaxy S3"),
array("Price" => 199.95),
array("Ammount" => 45)
),
array(
array("Brand" => "LG"),
array("Type" => "Cookie"),
array("Price" => 65.00),
array("Ammount" => 13)
)
)
這在C#
也是可能的,因為我不知道列表中有多少手機,並且數據類型不同: string
, decimal
, int
。 我不知道該使用什么因為你有lists
, structs
, objects
, classes
等等。
提前致謝!
使用類如下的類:
public class Phone
{
public string Brand { get; set; }
public string Type { get; set; }
public decimal Price { get; set; }
public int Amount { get; set; }
}
然后,您可以使用集合初始化程序語法填充List<Phone>
:
var phones = new List<Phone> {
new Phone{
Brand = "Samsung", Type ="Galaxy S3", Price=199.95m, Amount=45
},
new Phone{
Brand = "LG", Type ="Cookie", Price=65.00m, Amount=13
} // etc..
};
...或者在List.Add
的循環中。
填寫完列表后,您可以將其循環播放,一次只能獲得一部電話
例如:
foreach(Phone p in phones)
Console.WriteLine("Brand:{0}, Type:{1} Price:{2} Amount:{3}", p.Brand,p.Type,p.Price,p.Amount);
或者您可以使用列表索引器訪問給定索引處的特定電話:
Phone firstPhone = phones[0]; // note that you get an exception if the list is empty
或通過LINQ擴展方法:
Phone firstPhone = phones.First();
Phone lastPhone = phones.Last();
// get total-price of all phones:
decimal totalPrice = phones.Sum(p => p.Price);
// get average-price of all phones:
decimal averagePrice = phones.Average(p => p.Price);
最佳解決方案是創建您的Phone object
如:
public class Phone {
public string Brand { get; set; }
public string Type { get; set; }
public decimal Price { get; set; }
public decimal Ammount { get; set; }
}
並將此對象存儲在列表中(例如):
List<Phone> phones = new List<Phone> ();
phones.Add(new Phone { Brand = "Samsung", Type = "Galaxy S3", Price = 199.95, Amount = 45 });
etc
你會有一個模型類,比如
class Phone
{
public string Brand {get; set;}
public string Type {get; set;}
public decimal Price {get; set;}
public int Amount {get; set;}
}
然后要創建手機列表,您可以使用這樣的代碼
var phones = new List<Phone>
{
new Phone{Brand = "Samsung", Type = "Galaxy S3", Price = 199.95, Amount = 45},
new Phone{Brand = "LG", Type = "Cookie", Price = 65.00, Amount = 13},
}
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