C#：非泛型类型中的泛型成员？
我有一个包含对象列表的自定义控件。该控件由可视化设计器实例化，然后在代码中配置。该控件是一个显示实体列表的网格。
我有一个这样的初始化方法。
public void Initialise(ISession session, Type type, ICollection<IPersistentObject> objs)
IPersistentObject 是一个接口。但是，当我想分配实现 IPercientObject 的集合时，这不起作用。
所以我把它改成这样。
public void Initialise<T>(ISession session, Type type, ICollection<T> objs) where T : class, IPersistentObject
但现在我想将 objs 参数分配给 ICollection 类型的成员变量，但这是行不通的。
我无法使该类通用，因为它是一个不能具有通用类型的控件。我无法复制集合，因为控件必须修改传入的集合，而不是复制并修改它。
我应该怎么办？
I have a custom control which contains a list of objects. The control is instantiated by the visual designer and then configured in code. The control is a grid which displays a list of entities.
I have an initialise method like this.
public void Initialise(ISession session, Type type, ICollection<IPersistentObject> objs)
IPersistentObject is an interface. However this doesn't work when I want to assign a collection of something that implements IPersistentObject.
So I changed it to this.
public void Initialise<T>(ISession session, Type type, ICollection<T> objs) where T : class, IPersistentObject
But now I want to assign the objs parameter to a member variable of type ICollection<IPersistentObject> which doesn't work.
I can't make the class generic because it is a control which can't have generic types AFAIK. I can't copy the collection because the control MUST modify the passed in collection, not take a copy and modify that.
What should I do?
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如果您不需要将对象作为实际的集合（例如使用
Add/Remove方法等），那么您可以替换ICollection与IEnumerable。If you do not need to the objs to be an actual collection (e.g. with
Add/Removemethods etc..) then you could replace theICollectionwithIEnumerable.ICollection不支持这样的通用方差。在我看来，您的选择是：ICollection编写一个包装器，该包装器包装ICollection并为您进行类型检查。IEnumerable，它确实支持您所描述的方式的差异。IList，请使用它。ICollection<T>does not support generic variance like that. As I see it, your options are:ICollection<T>that wraps aICollection<IPersistentObject>and does the type-checking for you.IEnumerable<T>instead, which does support variance in the manner you describe.IList, if your concrete classes implement it.您可以将成员变量更改为非泛型
ICollection，并根据需要进行强制转换。You could change the member variable to a non-generic
ICollection, and cast as appropriate.