C#

The Union of the collection is the item that merges the collection, as shown in: list LS1 = new list () {1,2,3,5,7,9}; list LS2 = new list () {2,4,6,8,9,10};ienumerable unionls = LS1. Union (LS2); foreach (int item in UNIONLS) { Console.Write (

1 Overview What do you think is wrong with the following example? If you can quickly find the problem and solve it, then you can skip this article, thank you ~ ~. 1 list ltpi = new List (); 2 DataTable dt = Getbase_userinfotodatatable (); 3 for (

This article describes how to create, install, start, monitor, and uninstall simple Windows Service content steps and Considerations in C #, and the friends you need can refer to the following One, create a Windows Service 1) Create a Windows

C # development portals and applications (48 ), In many of our frameworks or project applications, caching can improve the response speed of the program to a certain extent and reduce the load on the server. Therefore, we have considered introducing

. Net reflection access private variables and private methods,. net Variables The following is the practice code: Using System; using System. collections. generic; using System. componentModel; using System. linq; using System. reflection; using

C # exception, Basic Structure Try {} catch (other exception) {// capture various exceptions. The exception will be handled immediately here} catch (exception) {// All exceptions except the preceding exceptions are caught here, but an exception

How to Create C # Closure ?, An important concept in JavaScript is closure. Closure has a large number of applications in JavaScript, but do you know? C # You can also create Closure. The following describes how to create a magic closure in

Generic knowledge, generic Int-2147483648 ~ 2147483647 2.1 billion In inheritance, subclasses have all attributes and actions of the parent class, and any parent class can be replaced by subclasses. Object is the parent class of all

C # generate random passwords in batches, which must contain numbers and letters and be encrypted using encryption algorithms, Required: the password must contain numbers and letters. Idea: 1. List numbers and characters. Composition string: chars 2

Foreach and yield in C, 1. foreach C # The Compiler converts the foreach statement to the methods and attributes of the IEnumerable interface. foreach (Person p in persons) { Console.WriteLine(p); } The foreach statement is parsed into the

Why can an array be queried using linq? Problem cause This is almost a topic that does not need to be discussed at all, because linq (here specifically, linq to objects) is originally for the set type, the array type can be used as a collection

SqlHelper tool class, Public class SqlHlper{Public static readonly string constr = ConfigurationManager. ConnectionStrings ["constr"]. ConnectionString;// Execute add, delete, and modify operationsPublic static object ExecuteNonQuery (string SQL,

Truncate string, C # string common methods include split, Substring, Replace, and remove. Use of split: 1. Split (Char ()) The returned string array contains the child strings in this instance (separated by elements in the specified Unicode

Instance of usage, instanceof usage From: Baidu encyclopedia Instanceof is mainly used to determine whether an instance of a class is used.Any object can callThe returned result is a Boolean value.ClassA a = new ();Boolean B = a instanceof;The

Structure (struct), structure struct A structure is a data type defined by a programmer and is very similar to a class. Both include data members and function members. Difference: 1. The class is the reference type, and the structure is the value

ActiveMQ application in C,  ActiveMQ is a good stuff. Needless to say. ActiveMQ supports multiple languages, such as Java, C, C ++, C #, Ruby, Perl, Python, and PHP. Since I develop a GUI in windows, I am more concerned about C ++ and C #. The

For Asynchronous understanding, asynchronous Previously, I was confused about Synchronous methods and asynchronous Methods Using async and await. I think what is the difference between the asynchronous and synchronous Methods waiting for execution

C # Network Programming Technology FastSocket practical project drills,I. FastSocket course Introduction . NET framework although Microsoft provides socket communication class libraries, there are still many things to handle by themselves, such as

Talking about the c # interface is suitable for beginners to understand, During this period of time, the project was useful to the interface. At first, it was not very easy to understand the interface, but only to know that the interface definition

C # Special case of reference type string, In C # programming, the string type is often used. It is also a reference type, but it is not used for reference everywhere. It is a special case. I will list it one by one, for your convenience: 1) direct