foreach statement

One iterator interface An iterator is a design pattern that is an object that can traverse and select objects in the sequence, and the developer does not need to know the underlyingStructure. Iterators are often referred to as "lightweight" objects

Example 1. Swich statementsThe expression in the switch statement must be an integer or character, and the constant value 1~ constant value n must also be an integer or character type. For the same switch statement, the constants of the case must

Jdk5.0 new features: Collection after jdk1.5, there is a parent interface iterable, the appearance of this interface will be extracted iterator method, improve the extensibility. -------------------------------------------------- Enhanced for Loop:

19.1.5 generic method In some cases, type parameters are not required for the entire class, and are required only for specific methods. Often, this is true when you create a method that accepts a generic type as a parameter. For example, when using

C # has a uniform specification for collection types. The benefits of it are self-evident that all collection classes have some unified invocation methods and attributes, which makes learning costs much less. The unified specification is implemented

Iterator: Enumerator If you are creating a class that behaves and behaves like a collection, it is convenient to allow users of the class to enumerate the members of the collection using a foreach statement. This is easier to implement in C # 2.0

An array is a group of identical types that are grouped together, using a generic name, to access the elements in the data collection by assigning the subscript.An array is a set of data that has the same type. When you access data in an array, you

1: Enumerators and enumerable typesWe know that using foreach, you can iterate through the elements in the array. So why the array can be handled by a foreach statement, let's discuss the problem below.2: Using the foreach statementWe know that when

In php, loop statements generally use while, for, and foreach, and control statements are if swicth. Next I will introduce the usage of php loop control statements. 1. The if... else loop has three structures. The first one is to use the if

C # 2.0 new feature 1. Generic 1.1 Generics IntroductionGeneric classes and generic methods are both reusable, type safe, and efficient, which are not available for non-generic and non-generic methods. Generics are typically used in collections and

The foreach statement structure in C # is used for read-only and sequential traversal of all elements in a set. The set must implement the system. Collections. ienumerable interface. The foreach statement can simplify the traversal of a set.

It has been a long time since the emergence of LINQ, and it has never been actually used. Sorry, I started to study the usage of LINQ today. The following is transferred from msdn: A query is an expression used to retrieve data from a data source.

Language integration query (LINQ) Introduction to LINQ Query --> A query is an expression used to retrieve data from a data source. Queries are usually expressed in a special query language. Over time, people have developed different

A query is an expression used to retrieve data from a data source. Queries are usually expressed in a special query language. Over time, people have developed different languages for various data sources, such as SQL for relational databases and

1. array Overview An array contains several variables of the same type, which can be accessed through indexes. The variables in an array are called the elements of an array. The number of elements that an array can contain is called the length of an

C # is a language with a strong type. We generally do not recommend that you convert the variable type. However, for the underlying code, to provide as much support for business code as possible, many times the type of method parameters is not

ArticleDirectory Delayed execution Force immediate execution Introduction to LINQ   LINQ is short for Language Integrated Query, that is, language integrated query. Why is language integration query? First, the query is

The declaration of an array 1, direct assignment way to declare an array $ array variable name [index value] = data content//The index value (subscript) can be a string or a number But sometimes, we can also assign values directly to the array,

How to define an array: Using the array built-in keywords Use [] to define Direct Assignment echo ‘‘;//定义数组的方式////1、使用array内置关键字$arr = array(1,2,4);print_r($arr);//2、使用[]定义$brr = [1,2,4];print_r($brr);//3、直接赋值$crr[] = 1;$crr[]

Show TOCWelcome to MSDN > Development languages and ToolsFuture features of the C # programming languageRelease Date: 4/30/2003 | Renew Date: 6/25/2004Prashant Sridharan Microsoft Corporation Apply to: Microsoft®visual C # (TM) Summary: Microsoft