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 (

The most obvious feature of SQL differs from other programming languages is the order in which the code is processed. In a large number programming language, code is processed in encoded order, but in the SQL language, the first processed clause is

What is UML? Unified Modeling Language (UML), also known as the Unified Modeling language or standard modeling language, is an OMG standard that began in 1997 and is a graphical language that supports modelling and software system development,

This article mainly describes the C # connection to the SQL Server2008 database instance code, the need for friends can refer to the following Not much nonsense to say, directly to everyone to paste the code, the specific code is as

The previous video tutorial we introduced the ASP. NET Basic tutorial, today to introduce the "dissemination of the wisdom of the Net Intermediate Series video Tutorial" ASP. NET is a Microsoft-led Enterprise Web application development technology

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

In C #, the array is passed as a parameter, Principle: control the modification of data as much as possible. If you can predict that a data will not or should not be changed, control it, instead of expecting that the caller who uses the data will

C # basic notes (the third day ), 1. type variables are not compatibleString and intString and doubleUse the convert conversion factory for conversion.String str = "123456 ";Int nums = Convert. ToInt32 (str ); 2. Front ++ and back ++, front -- and

C # List union, intersection, and difference set, The Union of a set is the item of the merged set, 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

C # color folder 2.1.5, Latest: https://pan.baidu.com/s/1c1FqYqs For more information, see the official website.MultiColorWinOr http://www.cnblogs.com/QQ81867376/p/6752630.html   A simple example is as follows:     The updates are as follows: I.

Usage of Dictionary in C, 1. To use the Dictionary set, you need to import the C # Generic namespace System. Collections. Generic // Assembly: mscorlib   2. Dictionary description Ing from a group of keys to a group of values. Each add item is

C # detailed description of DataTable, Add reference using System.Data; Create a table // Create an empty table DataTable dt = new DataTable (); // create an empty table DataTable dt = new DataTable ("Table_New") named "Table_New "); Create a

C # Use HtmlAgilityPack to capture web page information, I saw a blog post a few days ago: C # Crawling Novels The blogger uses a regular expression to obtain the name, directory, and content of a novel.   The following uses HtmlAgilityPack to

For EF database update, update the settings of the specified field, ef Field 1. Set the update field for EF and the new database When EF is submitted to the database, some fields may not want to be updated, or you can update a model to the

List Distinct () deduplication, objectdistinct Sometimes we deduplicate the data in a list set. C # provides a Distinct () method that can be clicked directly. If T in list is a custom object, the Distinct effect cannot be achieved for the set

Enterprise development-issuing enterprise red envelopes (C #),I. Enterprise APIs Address: http://work.weixin.qq.com/api/doc#11543Ii. parameter description 1. Sending enterprise Red Packets Request Method: POST (HTTPS)Request address: https://api.mch.

Static constructor,  Let's take a look at a common question. What is the execution result of the following code? class A{ public static int X = B.Y + 1; static void Main(string[] args) { Console.WriteLine(X); }} class B{

Import data in execl into the database in batches and execl into the database This article uses the NPOI plug-in to read the data in the execl file and load the data to the DataTable in the memory.1 /// 2 /// convert Excel to able 3 /// 4 /// 5 /

C # Singleton Pattern ), (The New handwritten blog mainly summarizes his own learning. Will explain a lot of small details .) Singleton mode definition: Make sure that a class has only one instance and provides a global access point. First, we

C # design mode, Billing Mode Make sure that a class has only one instance and provides a global access point to it. The following code is used:   /// /// single-profit mode class ///// public class interest {/// /// defines a single-profit lock/