收藏的隐式转换 [英] Implicit conversion of collections

问题描述

如果我定义两种类型之间的显式转换运营商，不应该跟随它，我可以明确这些类型的集合之间的转换？ IE浏览器。

If I define an explicit conversion operator between two types, shouldn't it follow that I can explicitly convert between collections of those types? Ie.

    public static explicit operator FooEntity(Entity entity)
    {
        FooEntity e = new FooEntity(entity);
        return e; 
    }

就这样，我能做到这一点，

And thus I could do this,

    IEnumerable<Entity> entities = GetEntities();
    IEnumerable<FooEntity> fooEntities = (IEnumerable<FooEntity>)entities;

或

    IEnumerable<FooEntity> fooEntities = entities as IEnumerable<FooEntity>

这是可能以某种方式或者我也可以创建自己的操作者集合之间的转换？我收到写着转换是不可能的运行时错误。

Is this possible somehow or do I also have to create my own operator to convert between the collections? I am getting a run-time error that says the conversion is not possible.

感谢。

推荐答案

C＃不支持此的一般方法在收集分配类型差异，你将不得不使用这样的：

C# does not support this method of generic type variance on collection assignment, you'll have to use something like:

IEnumerable<FooEntity> fooEntities = entities.Select(e => (FooEntity)e);

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