[英]Initializer using a string for DataMember returning a static object of the class (factory pattern) in C#?
My first question on StackOverflow, I feel intimidated and excited. 关于StackOverflow的第一个问题,我感到很害怕和兴奋。
I tryied to have an exact behavior of for a class using static object as factory pattern and being serialized with just a type as string. 我尝试使用静态对象作为工厂模式并仅使用类型作为字符串进行序列化的类具有确切的行为。 When deserialized, the Initializer should return the static object based on the string.
反序列化时,初始化器应基于字符串返回静态对象。
It is easier to do over an example: 通过示例更容易做到:
[DataContract]
public class Interpolation
{
[DataMember]
public string Type { get; set; }
public static Interpolation Linear = new Interpolation(...)
}
I'd like to get a Linear interpolation thought different ways: 我想以不同的方式获得线性插值:
var interpolation = Interpolation.Linear;
var linear = new Interpolation
{
Type = "Linear"
};
The first one is a factory pattern (kind of), the second one is used for the deserialization. 第一个是工厂模式(种类),第二个用于反序列化。
I have trying few solutions. 我尝试了几种解决方案。 Normally I have a generic constructor, and I am using specific parameters to create the static object.
通常,我有一个通用的构造函数,并且正在使用特定的参数来创建静态对象。 It would become:
它将变成:
[DataContract]
public class Interpolation
{
[DataMember]
public string Type
{
get { return _type; }
set
{
_type = value;
_interpolation = Select(value);
}
}
private string _type = "Linear"; // Default
private Func<double, double[], double[], double> _interpolation;
private Interpolation(Func<double, double[], double[], double> interpolation, string type)
{
_interpolation = interpolation;
_type = type;
}
public static Interpolation Linear = new Interpolation(_linear, "Linear");
private double _linear(double x, double[] xx, double[] yy)
{
...
}
This method won't work if there is no generic constructor (the object is too complicated to be created only from parameters). 如果没有通用构造函数,则此方法将不起作用(对象太复杂而无法仅通过参数创建)。 Also the static object Interpolation.Linear already exists, I don't necessarily want to recreate it.
静态对象Interpolation.Linear也已经存在,我不一定要重新创建它。
What I would like is 我想要的是
var linear = new Interpolation
{
Type = "Linear"
};
returning 回国
Interpolation.Linear
A constructor can't return a static object of the class: 构造函数无法返回该类的静态对象:
public Interpolation(string type)
{
return Interpolation.Linear; // Won't work
}
Maybe by using Reflection... Thanks :) 也许通过使用反射...谢谢:)
new
is intended to create a new instance. new
用于创建新实例。 If you are trying to use it to return an existing instance, you are doing it wrong. 如果尝试使用它返回现有实例,那么您做错了。 Just stick with a (kind of) singleton
只是坚持一个(那种)单身人士
var interpolation = Interpolation.Linear;
Or use a factory like this 或者使用这样的工厂
public static class InterpolationFactory
{
public static Interpolation GetInterpolation(string type, Func<double, double[], double[], double> interpolation = null)
{
if (type == "Linear")
{
return Interpolation.Linear;
}
else
{
return new Interpolation(interpolation);
}
}
}
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