[英]How To Store Mixed Array Data?
Let's say I have an array I need to store string values as well as double values. 假设我有一个数组,我需要存储字符串值以及双值。 I know I can store the doubles as strings, and just deal with the conversions, but is it possible to use an array with two data types?
我知道我可以将双打存储为字符串,只处理转换,但是可以使用具有两种数据类型的数组吗?
You may use object[]
and do some type checking. 您可以使用
object[]
并进行一些类型检查。 You will get some boxing/unboxing when accessing the doubles, but that will be faster than double.Parse()
anyway. 在访问双打时你会得到一些装箱/拆箱,但这比
double.Parse()
要快。
An alternative is to create a class with both types and a marker: 另一种方法是创建一个包含两种类型和标记的类:
class StringOrDouble
{
private double d;
private string s;
private bool isString;
StringOrDouble(double d)
{
this.d = d;
isString = false;
}
StringOrDouble(string s)
{
this.s = s;
isString = true;
}
double D
{
get
{
if (isString)
throw new InvalidOperationException("this is a string");
return d;
}
}
string S
{
get
{
if (!isString)
throw new InvalidOperationException("this is a double");
return s;
}
}
bool IsString { get { return isString; } }
}
and then create an array of StringOrDouble. 然后创建一个StringOrDouble数组。 This will save you from some typechecking and boxing, but will have a larger memory overhead.
这将节省你的一些类型检查和拳击,但会有更大的内存开销。
sure use: 确定使用:
object[], ArrayList, or List<Object>;
You'll have to cast, and probably pay a boxing penalty for the doubles, but they will allow you to store two different types. 你必须施放,并可能为双打支付拳击罚金,但他们将允许你存储两种不同的类型。
Not the most efficient usage, but how about for flexibility: 不是最有效的用法,但灵活性如何:
var a = new object[] {1,2,3,"paul",5.5}
or even 甚至
var a = new object[] {1,2,3,"paul",5.5, new List<string>() {"apple","banana","pear"} }
object[]
and ArrayList
are two decent options; object[]
和ArrayList
是两个不错的选择; it depends on whether you need a traditional fixed-length array or a vector (variable-length array). 这取决于您是需要传统的固定长度数组还是矢量(可变长度数组)。 Further, I would "wrap" one of these in a custom class that did some type-checking, if strings and doubles are the ONLY things you can deal with, and you need to be able to get them back out as strings and doubles.
此外,我将其中一个“包装”在一个自定义类中进行一些类型检查,如果字符串和双精度是你可以处理的唯一的东西,你需要能够将它们作为字符串和双精度返回。
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