C#

1 = = = is a value of a direct comparison value type or a reference address of a reference type, but = = cannot be used for struct,struct can only be compared with equals. = = In general, the results obtained from object.equals are equal.2,

Terms and concepts that have not been understood in those years: covariant, invert, unchanged, and unchanged termsBriefly describe what is covariance, inversion, and immutability Covariance, such as: string-> object (Conversion from subclass to

. Net open-source database design tool Mr. E For Linq (EF 6.1) Tutorial (ii) cascading deletion and triggers, mr. elinq 1. Establish cascading Deletion The cascade deletion of Mr. E is not the cascade deletion that comes with the database, but the

C # Learning-Hellow World, Let's take a look at the Hello World code. // Single-row comment/* multi-row comment * // using System in XML; // contains a namespace, similar to useusing System in PHP. collections. generic; using System. linq; using

NULL, "", String. Empty differences in C, (1) NULLThe null keyword is a text value that does not reference any object's null reference. Null is the default value of the reference type variable. Then, only the referenced variable can be NULL. If int

Notes for learning from the basics of LinQ (1) getting started with LINQ to (Objects, XML, SQL), linqobjects For the author, the beautiful and concentrated code is shocking. The research of LINQ is to write its own code. Previously, I learned the

SharpGL learning notes (10) common light source types, creating light sources, sharpgl learning notes   In OpenGL, different types of lights can be created by combining the characteristics of the light source, such as color, position, and

SharpGL learning notes (7) OpenGL transformation summary, sharpgl learning notes The biggest difficulty I encountered with OpenGL was that when I often debug a piece of code, the screen was dark and I didn't know the result was correct. I didn't

Asp.net MVC project development Statistical Chart echarts background data processing (3), mvcecharts The items displayed on the front end are easily modified with corresponding documents. The data transmission method on the back end is what we are

Let's talk about IQueryable , unveil the mystery of the Expression Tree and the secret of iqueryable. Next, let's talk about IEnumerable. Do you really understand the foreach we use every day? Recently, it was a breeze to customize your own orm in

Static, dynamic, and dynamic In C #4.0, the core feature is the introduction of dynamic types. 1. Introduction to dynamic types C # Is a static language, because it must explicitly specify the type of the variable when defining the variable. For

C # process and access HTTP interface requests, In the era of interface flooding, it is necessary for a programmer to understand and process interfaces! During the connection, you need to carefully read the documents sent by the other party. If

C # development portal and application (45) -- scan the QR code to log on, In the previous article "C # development portal and application (41) -- code scanning and logon Processing Based on Open platforms", we introduced the process of code

LINQ: start to use the query syntax and method syntax in LINQ (5)-LINQ.Getting started with the query syntax and method syntax in LINQ (5 )- In the Expression Language Integrated Query (LINQ), the use of the LINQ query syntax, most of the queries in

SMS questions about cats and cats [FAQs about sms cats]     Reference of getDeviceNameByRFID. Note: StringBuilder. Append (DbHelperSQL. getDeviceNameByRFID (dt. Rows [I] ["RFID"]. ToString (); // () next to ToString ()!!!     A series of

Courier push C # SDK, The official sdk does not provide a C # DEMO. Considering other. NET sdks, the following is a demo I wrote when I used it. What's wrong? Thank you for your guidance.There are two main problems during use:1. Parameter Assembly.

Open-source cross-platform IOT communication framework ServerSuperIO, integrated into the NuGet Package Manager, and Demo instructions, iotnuget Iot involves various devices, sensors, various data sources, and protocols, and it is difficult to unify

Type and general language runtime: System. Object, general system. object CLR requires that each type ultimately inherit from the System. Object Type1 // implicitly inherit Object2 class Employee {3... 4} 5 6 // display inherit Object7 class

Use ClientKey to log on to the QQ space and set the background music and clientkey background music. As we all know about ClientKey, after logging on through webbrowser, you can obtain the Cookie and calculate the GTK to operate the POST of the

C # I understand the value type and reference type, For a long time, both the value type and the reference type are just a fuzzy concept, so I have a thorough understanding of them when I have time. First, let's talk about the value type. On msdn,