• Function and usage of seekbar


    The drag bar is very similar to the progress bar, except that the progress bar uses color filling to indicate the degree of progress completion, while the drag bar uses the position of the slider to identify the value – and the drag bar allows the user to drag the slider to change the value, […]

  • Explain SQL Server database architecture and objects, define data integrity


    Preface In this section, we will continue our journey of SQL. In this section, we will talk about some basic knowledge and what we need to pay attention to. If there is something wrong, please point out the short content and in-depth understanding. Database schema and objects The database contains the schema, and the schema […]

  • Detailed explanation of the essence of exc? Bad? Access and the debugging principle of Zombie mode


    What is exc? Bad? Access and how to debug it Sometimes, you will encounter a crash caused by exc? Bad? Access. This article will tell you what exc? Bad? Access is and why it is produced. I will also provide some solutions for exc? Bad? Access errors. 1. What is exc? Bad? Access? Once you […]

  • New features of ES6


    ECMAScript 6 is the version released by ECMA on June 2015. As a demarcation point, now we usually call these later versions ES6. ES6 has brought a lot of new syntax and added the concept of class. It can be predicted that JavaScript is moving towards an engineering language. We don’t know whether this is […]

  • JavaScript BOM navigator screen (21)


    Catalog: 1. Navigator object 2. Screen object I. Navigator object 1. What is a Navigator object? The Navigator object contains information about the browser.Note: there is no public standard applied to navigator objects, but all browsers support this object. 2. Use of Navigator object Navigator object represents the information of current browser, through which different […]

  • The simplest ArcGIS Engine Application (I)


      Noun: Iworkspacefactory workspace factory Shapefileworksapcefactory vector file workspace factory Iworkspce workspace Ifeatrueworkspace feature workspace Ifeatureclass feature class Ifeaturelayer feature layer Featurelayerclass feature layer class Ilayer layer objects IMAP map object   Load the specified SHP file (code analysis) using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; […]

  • Json.parse is faster than object literal syntax


    Written in front Original address: https://www.bram.us/2019/11/25/faster-javascript-apps-with-json-parse/ The original text contains the video of oil pipe. If you have a ladder and good English, you can click the link to watch it. For readers who are too long to read becauseJSONGrammatical ratioJavascriptThe syntax of is simpler, so parsingJSONRatio analysisJavascriptMore efficient. When a web app needs to […]

  • Nodejs from introduction to advanced one (basic part)


    I. Basic knowledge of node.js 1, concept Simply put, node.js is the JavaScript running on the server side. Node.js is the running environment of JavaScript Node.js uses an event driven, non blocking I / O model to make it lightweight and efficient. 2. Installation and use Download address: http://nodejs.cn/ Nodejs5 basic objects: 1. Require import […]

  • The use of comboboxedit control


    scene WinForm control – devexpress18 download installation registration and use in vs: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/100061243 Use of the drop-down box control lookupedit of devixpress, add the item option value, and modify the default display value: https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/102464577 Note: Blog home page:https://blog.csdn.net/badao_liumang_qizhi Pay attention to the public addressDomineering procedural apeGet programming related ebooks, tutorials and free downloads. Realization DevExpress.XtraEditors.ComboBoxEdit […]

  • JS create, write, read file, FileSystemObject


    FileSystemObject FileSystemObject is an IIS built-in component that accesses the file system on the server (such as operating a disk, folder, or text file). FSO cannot operate binary files. To operate binary files, use: adodb.stream. When creating a file object, we usually define an FSO object variable to get the FileSystemObject object.var fso=new ActiveXObject(“Scripting.FileSystemObject”); The […]

  • [original] advanced IOS development (Tang Qiao) reading notes (2)


    Part 3: the underlying principles of IOS development 1. Objective-C object model 1.1 isa pointer Code of nsobject. H: NS_ROOT_CLASS @interface NSObject { Class isa; } Code of objc. H: typedef struct objc_class *Class; typedet struct objc_object { Class isa; } *id; Each object has a pointer named isa to the object’s class The flow […]

  • Using automapper in dotnet core


    Official website: http://automapper.org/ File:https://automapper.readthedocs.io/en/latest/index.html GitHub:https://github.com/AutoMapper/AutoMapper/blob/master/docs/index.rst What is automapper? Automapper is an object object mapper.Object object mapping works by converting one type of input object to another type of output object.What makes automapper interesting is that it provides some interesting conventions to avoid figuring out how to map type A to type B. As long as […]