C array supplement

c# A few simple additions to the array

An array is a reference type , Whether its element is a value type or a reference type .

c# Various interfaces implemented by array objects in :

//  Defines the ability of shallow copy , So arrays can be shallow copied System.ICloneable// ICollection Interface descendants , Use interface programming to reduce coupling , This interface only defines some methods , With indexer , Query element location , insert data , Remove the index location data , It can be simply used as a container for storing data , Can not be like List That has a lot of data processing methods .System.Collections.IList//  The parent base class of the collection , Defines the number of return elements , Some of the most basic methods of collection types, such as copying , At the same time, it provides synchronous access ICollection Methods of object elements , Arrays have these capabilities System.Collections.ICollection//  Define the ability of iterative traversal , Arrays can be used foreach loop System.Collections.IEnumerable// .net4  New interface , Defines the ability to sort , Data can be sorted, so System.Collections.IStructuralComparable// .net4  New interface , Define comparative capabilities , Array can compare whether the array has the same content. If the number of elements is different, it directly returns unequal , Having several elements at the same time will perform several comparisons System.Collections.IStructuralEquatable//  Indexers are also provided , There are several ways to delete and insert query data , But it's generic data /*  special , By default, all arrays inherit from Array abstract class , This class implements the above interface , But when looking at the source code, you can't see that the array implements the following interfaces , These interfaces are really CLR Dynamically implement the following interfaces for one-dimensional arrays  */System.Collections.Generic.IList <T>//  The ability to provide generics , It also has the basic function of adding, deleting, modifying and checking System.Collections.Generic.ICollection <T>//  A type can use linq iteration , The interface must be changed , So arrays can use linq Inquire about .System.Collections.Generic.IEnumerable <T>//  read-only list, Access the read-only through the index list The elements of System.Collections.Generic.IReadOnlyList <T>//  Read only set , Access the elements of the read-only collection through the index System.Collections.Generic.IReadOnlyCollection <T>

Code view ：

            foreach (var type in (new int[0,0]).GetType().GetInterfaces())                Console.WriteLine(type);

By executing this code , When the array created is a one-dimensional array , The array object will implement the generic interface , You can have linq The ability to query , But when it's not a one-dimensional array , At this time, the data does not have linq The ability of , At this time, the array object does not implement the generic interface .

These movements are made by CLR （ Common language runtime ） Executive , The internal principle is not clear , But in general linq Queries are operations on collections , Arrays belong to collections , But because there are multidimensional arrays , Arrays cannot be implemented directly IEnumerable Generic interface get linq The ability to query , Instead, managed code is run by CLR Responsible for handling , Give interface capabilities to one-dimensional arrays , Non one dimensional arrays cannot have interface capabilities .

Of course, all of the above are for reference types , Value types do not have such operations that dynamically empower interfaces .