C#

Example of the Distinct () method in MSDN Name {; Code {; Product [] products = {Product {Name =, Code = Product {Name =, code = lstDistProduct = (Product p ++ However, in actual use, it is often impossible to filter out non-duplicate data. Find

Double-click a WinForm program to open an interface, that is, an instance running a program. When you double-click multiple times, multiple program interfaces will appear. Sometimes we only need to allow the program to run only one instance at a

The NPOI component is powerful and efficient. Here we only use it to write data in Excel. If you need more content, please search for it by yourself. IWorkbook: The workbook object, which can be instantiated by NPOI. HSSF. UserModel. HSSFWorkbook.

A common method used by catch and finally is to obtain and use resources in the try block, handle exceptions in the catch Block, and release resources in the finally block. Catch this will catch any exceptions. Catch (Exception e) This will capture

The Panel uses the Loader method to call the page for content loading.Note the following key points: Home page: Background code: protected void

Recently, when I was working on OA, I encountered many configuration items that need to be manually modified for IE, such as file download prompts, ActiveX prompts, and browser tag settings. I felt that if I had asked users to manually configure

Literacy description Literacy uses the IL command to generate a method delegate. In terms of performance, it is much higher than reflection when the number of calls reaches a certain level. Of course, it takes time to generate a method using the IL

In this case, DataRow is converted to a single entity, and dataTable is converted to a List generic type, which supports time format conversion. The following methods are all extension methods. The extension method must be written in a static class,

Requirements for selecting nodes in the TreeView tree: 1. If no node is selected, all its subnodes are not selected. 2. If a node is selected, all its subnodes are selected. 3. If no subnode of a node is selected, the node is not selected. 4.

How to Understand Elements We can understand metadata as additional information exported along with the type.. Sometimes we will consider exporting metadata along with the type and adding some instructions so that we can add some filtering

Main (savePath = sourcePath = sourceName = scale = Image. fromFile (sourcePath + width = img. width/height = img. height/= System. drawing. rectangle (, System. drawing. rectangle (, + first iteration code [] IMAGE_EXTNAME = [] {Main

Namespace System. Windows. Forms. Controls{[ToolboxBitmap (typeof (LoginBox), "Resources.LoginBox.bmp")]Public class LoginBox: UserControl{}} You can find ToolboxBitmap on the Internet. Here I just want to emphasize some of my problems. 1. Why is

Decoration mode: the dynamic topology adds some additional responsibilities to an object. In addition, the decoration mode is more flexible than the subclass generation.   Component is an object interface that can dynamically add responsibilities

Before reading this blog post, I hope you can read this article by Allan. Http://www.cnblogs.com/zlgcool/archive/2008/10/12/1309616.html When I visited the garden, I occasionally saw Allan. This article provides two dynamic compilation solutions.

  C # parsing JSON has always been a headache. I found a good method on the internet because all kinds of materials are older. Start NuGet, search Newtonsoft. Json, and install it. This is a very good Json Parsing Library. It is very good and

Classes and structures have members that represent their data and behavior. The class members include all the members declared in the class, and all the members declared in all classes in the inheritance hierarchy of the class (except constructors

When the company server is started every day, it does not log on to the system. Therefore, to run a specific program, you only need to start it as a Windows service. We do not need to modify the original program, but need to communicate with SCM

I. Introduction When talking about the disadvantages of the simple factory model in the simple factory model, one thing is that the system in the simple factory model is difficult to expand. Once a new product is added, You have to modify the simple

Here, I would like to thank the "xor" operator. Really, thank you, ^ (xor). Without it, maybe my architecture is always inseparable from the negative formula, if you don't understand what I said, let's take a look at this article. In fact, this

Play a single song Player. URL =   Add multiple songs to the playlist   IWMPPlaylist playList = player. playlistCollection. newPlaylist (); (DataRow drItem = player. newMedia (drItem []. ToString (); = Or add it directly to the current list. (