[英]Implement IEnumerable<T> For a List Wrapper
I have a class, which is just a wrapper over a list, ie, 我有一个类,它只是一个列表的包装,即,
public class Wrapper
{
public List<int> TList
{get;set;}
public Wrapper()
{
TList=new List<int>();
}
}
I want to make Wrapper
inherits from IEnumerable so that I can use the following syntax: 我想让
Wrapper
从IEnumerable继承,以便我可以使用以下语法:
Wrapper wrapper = new Wrapper()
{
2,4,3,6
};
Any idea how to which interface to implement IEnumerable<T>
, or IEnumerable
, and how to define the method body? 知道如何实现
IEnumerable<T>
或IEnumerable
,以及如何定义方法体?
If you implement ICollection<int>
you get the desired functionality. 如果实现
ICollection<int>
,则可以获得所需的功能。
Correction: you actually only need to implement IEnumerable
or IEnumerable<T>
and have a public Add
method in your class: 更正:您实际上只需要实现
IEnumerable
或IEnumerable<T>
并在您的类中使用公共Add
方法:
public class Wrapper : IEnumerable<int>
{
public List<int> TList
{ get; private set; }
public Wrapper()
{
TList = new List<int>();
}
public void Add(int item)
{
TList.Add(item);
}
public IEnumerator<int> GetEnumerator()
{
return TList.GetEnumerator();
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
}
(I also took the liberty of making the TList
setter private; it is usually recommended that collection type properties are read-only so that the collection as such can not be substituted by any code outside the type.) (我也冒昧地将
TList
setter TList
私有;通常建议集合类型属性是只读的,这样集合就不能被类型之外的任何代码替换。)
In order to get collection initializers you need to do 2 things: 为了获得集合初始化程序,您需要做两件事:
The preferable way to get these is to implement ICollection, but the minimum you need to do is: 获得这些的最佳方法是实现ICollection,但您需要做的最小事情是:
public class Wrapper : IEnumerable<int>
{
public List<int> TList
{get;set;}
public IEnumerator<int> GetEnumerator()
{
return TList.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator() // Explicitly implement the non-generic version.
{
return TList.GetEnumerator();
}
public void Add(int i)
{
TList.Add(i);
}
public Wrapper()
{
TList=new List<int>();
}
}
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