怎么做“编译时间”记录数组的初始化？ [英] How to do "Compile time" initialization of record array?
问题描述
回到旧的与C相关的日子，我曾经做过像......
struct
{
char描述[20]; < br $>
浮动价格;
}商品[] =
{
{" Apple"，1.99}，
{" Banana"，2.04}
};
如果我想做类似的事情（和我一样），有没有人提示
显然是新的C＃程序员？
非常感谢任何帮助，
John Kelsey
这看起来像一个哈希表。所以我会这样做...
哈希表hashtable = new Hashtable（）;
hashtable.add（" Apple"，1.99）;
hashtable.add（" Banana"，2.04）;
但是你必须知道密钥（例如''Apple''或''Banana'' ）
在哈希表中引用这些项目。我建议用你想要的属性创建一个新的
对象。然后创建一个ArrayList，并将
添加到ArrayList。
Dave，
我很欣赏这个回复，但我正在寻找一些不同的东西。
我的数组在运行前被初始化了。我知道我可以将
记录添加到集合中。作为程序执行的一部分，但是在C中，
数组包含了我想要的值而无需编写一个可执行的
语句。
这可能是C＃不支持的一个微妙点...它可能只是我的
编程风格......
我想这归结为
int i = 32;
和
int i;
之间的区别
....
i = 32;
这是否更清楚？
Dave <直流***** @ gmail.com>在消息中写道
news：11 ********************* @ g14g2000cwa.googlegro ups.com ...这看起来像一个哈希表。所以我会这样做...
Hashtable hashtable = new Hashtable（）;
hashtable.add（" Apple"，1.99）;
hashtable.add（" Banana" ;，2.04）;
然而，您必须知道密钥（例如''Apple''或''Banana''）才能在哈希表中引用这些项目。我建议用你想要的属性创建一个新的
对象。然后创建一个ArrayList并将该对象添加到ArrayList。
John Kelsey< ke ***** @ tacits.com>写道：返回旧字样与C的日子，我曾经做过类似的事情...
结构
{描述[20];
浮动价格;
}项目[] =
{
{" Apple"，1.99}，
{" Banana"，2.04}
};
如果我想要的话做一些类似的（和我做的），有没有人提示明显是新的C＃程序员？
嗯，首先我要分开声明类型使用
吧。然后我会提供一个构造函数来获取描述和
的价格，并使用它。例如：
使用系统;
公共类物品
{
字符串描述;
公共字符串描述
{
get {return description; }
}
//注意更改使用小数类型，
//这通常比float更合适< br $>
//金钱
十进制价格;
公共小数价格
{
得到{返回价格; }
}
public Item（字符串描述，小数价格）
{
这个。 description = description;
this.price = price;
}
}
公共课测试
{
static void Main（）
{
Item [] items =
{
新商品（Apple，1.99m），
新商品（Banana，2.0m）
};
foreach（项目中的项目项目）
{
Console.WriteLine（" {0}费用{ 1}"，
item.Description，
item.Price）;
}
}
}
-
Jon Skeet - < sk *** @ pobox.com>
http://www.pobox.com/~skeet 博客： http://www.msmvps.com/jon.skeet
如果回复小组，请不要给我发邮件/>
Back in the "old" days with C, I used to do something like...
struct
{
char Description[20];
float price;
} Items[] =
{
{"Apple", 1.99},
{"Banana", 2.04}
};
If I wanted to do something similiar (and I do), does anyone have hints for
an obviously new C# programmer?
Any help is greatly appreciated,
John Kelsey
That looks like a hashtable. So i would do...
Hashtable hashtable = new Hashtable();
hashtable.add("Apple", 1.99);
hashtable.add("Banana", 2.04);
However you will have to know the key (e.g. ''Apple'' or ''Banana'') to
refer to these items in the hashtable. I would recomend creating a new
object with properties that you desire. Then create an ArrayList and
add that object to the ArrayList.
Dave,
I appreciate the response but I was looking for something slightly
different.
My array was initialized before runtime. I understand that I can add
records to a "collection" as part of the program execution, but in C, the
array contained the values I wanted without having to write one executable
statement.
This may be a subtle point that C# doesn''t support... it may just be my
programming style...
I guess it boils down to the difference between
int i = 32;
and
int i;
....
i = 32;
Is this any clearer?
"Dave" <dc*****@gmail.com> wrote in message
news:11*********************@g14g2000cwa.googlegro ups.com...That looks like a hashtable. So i would do...
Hashtable hashtable = new Hashtable();
hashtable.add("Apple", 1.99);
hashtable.add("Banana", 2.04);
However you will have to know the key (e.g. ''Apple'' or ''Banana'') to
refer to these items in the hashtable. I would recomend creating a new
object with properties that you desire. Then create an ArrayList and
add that object to the ArrayList.
John Kelsey <ke*****@tacits.com> wrote:Back in the "old" days with C, I used to do something like...
struct
{
char Description[20];
float price;
} Items[] =
{
{"Apple", 1.99},
{"Banana", 2.04}
};
If I wanted to do something similiar (and I do), does anyone have hints for
an obviously new C# programmer?
Well, firstly I''d separate the declaration of the type from the use of
it. I''d then provide a constructor which took the description and the
price, and use that. For instance:
using System;
public class Item
{
string description;
public string Description
{
get { return description; }
}
// Note change to use the decimal type,
// which is usually more appropriate than float
// for money
decimal price;
public decimal Price
{
get { return price; }
}
public Item (string description, decimal price)
{
this.description = description;
this.price = price;
}
}
public class Test
{
static void Main()
{
Item[] items =
{
new Item ("Apple", 1.99m),
new Item ("Banana", 2.0m)
};
foreach (Item item in items)
{
Console.WriteLine ("{0} costs {1}",
item.Description,
item.Price);
}
}
}
--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet
If replying to the group, please do not mail me too
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