问题
I'm passing a lambda expression as a parameter.
In this case, someObject has a property called property accessible with someObject.property.
When I pass: o => o.childListOfObjects[0].property,
where childListOfObjects is a List<someObejct> and ,
expression.Body returns o => o.childListOfObjects.get_Item(0).property.
Skip to the end:
Is list[i] an alias for list.get_item(i) in C#?
回答1:
Yes, properties in general are just syntactic sugar around get_PropertyName and set_PropertyName methods.
Indexers -- for example, list[i] -- are just a special type of property, basically syntactic sugar around get_Item(i) and set_Item(i) methods.
(Note that the indexer property doesn't necessarily have to be called Item, but that's what it's called on List<T>, and that's the default name given to indexers on custom types too unless you override it using IndexerNameAttribute.)
回答2:
The documentation for List<T> says it this way:
The default Item property (the indexer in C#) is used to retrieve an item
So yes, list[i] is the indexer, which is the default property, which in this case is Item. It will get or set Item[i] depending on whether the context is reading or writing.
See also: Indexers
回答3:
The square brackets can be overloaded, they're called indexers. So we need to know what class list is an instance of.
EDIT: Whoops, didn't see that list is a List. I'm not sure what method you mean, though, there is no List<T>.getItem().
回答4:
not necessarily. List defines an indexer that will most likely just call the get_item but that's not guaranteed, there might be more hidden logic defined in the indexer... but the answer is probably yes.
来源：https://stackoverflow.com/questions/6202523/is-listi-an-alias-for-list-get-itemi-in-c