C#

We are accustomed to think that the subclass is not visible to the parent class, or that the parent class does not know the existence of subclasses, so the parent class is called the method, property of the child class, the following way, the parent

In a namespace, we can also use an alias to refer to an existing namespace or some other type of data. Aliases are used in the following format: Using alias = a type that already exists; Example: Using Soholife = System; Let's take a look at some

Now I want to talk about containers in C #. This is a very important topic, because no matter what kind of program you write, you cannot deal with the container. What is a container (pour!). A container is something that can hold something (again!),

Now what I'm going to say is the user-defined conversion in C # (user-defined Conversions), which uses the knowledge of the preceding struct, that is, the structure, forget it? Well, not forgetting it. We can see the usefulness of the structure from

Myconn.cs Namespace Notpage { Using System; Using System.Data.SQL;// Summary description for MyConn. public class Myconn:System.Data.SQL.SQLConnection { PRivate void InitializeComponent () { } Public myconn (){//Todo:add Constructor Logic

Although it is C + +, there are always some similarities. When the window refreshes, it generates a paint event, so we add a handler function to the event. Then draw in this function. will ensure that the drawing is not refreshed, It can always be

Screen Cutting The CopyFromScreen function in the Grahpics class allows you to copy the screen to a Graphics object. If the graphics object is created from a window form, the screen directly displayed in the window. See Example: Add a button to the

In the last piece has been introduced to you how to use GDI + to draw a simple image, this piece continues to introduce some other drawing knowledge. 1. First we look at the pen we used in the last piece. The properties of a pen are: color, dashcap

1. Properties The so-called attribute is actually a special class member that implements controlled access to the private class domain. There are two property methods in the C # language, one is get, through which you can return the value of a

In C #, the declaration of an array is an instantiation of the arrays. Declaration of a one or one-D array 1. Integer array The following declares a one-dimensional array with 5 integer elements: int[] array = new INT[5]; The above array

such as the following code: int age = 25; Short newage = 25; Console.WriteLine (age = = newage); True Console.WriteLine (Newage.equals (age)); False Console.ReadLine (); int and short are primitive types, but the comparison with "= =" returns True,

There are several ways to compare equality in. Net Static ReferenceEquals of Object () Static Equals () of object Example of Object Equals () operator = = Here's a look at their differences and usage. ReferenceEquals ReferenceEquals is used to

Handling Exceptions in C + + has a slight implicit limitation at the language level, but in some cases you can bypass them. Learn a variety of ways to use anomalies and you can produce more reliable applications. Keep exception source information in

public static string Encrypt (string source) { MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider (); byte[] bytes = Encoding.UTF8.GetBytes (source); byte[] output = Md5.computehash (bytes); return bitconverter.tostring (output); } The

Using SQL Server to establish a database Hovertree Then use the following script to create the table Hovertree_usermessage Use [hovertree]go/****** object:table [dbo]. [Hovertree_usermessage] ******/set ansi_nulls ongoset quoted_identifier

Collections are an important concept in OOP, and the full support for collections in C # is one of the best of the language. Why use a generic collection? There are two main ways to implement a collection before C # 2.0: A. Using ArrayList It is

The concept of permutation combinations Arrange: Remove m (m≤n) elements from n different elements, in a certain order, called a permutation of m elements from n elements (arrangement). Combination: from m different elements, any n (n≤m) element is

1 What is WMI? Windows Management Instrumentation (WMI) is a scalable system management structure that employs a unified, standards-based, and extensible object-oriented interface. It provides a standard way to interact with system administrator

Self-written thread pool, self-written Thread Pool C # I have ThreadPool and Task. Why do I need to write the thread pool? I have never thought about writing a thread pool myself before. I used ThreadPool or Task to write crawlers some time ago. I

. Net calls the R language and. net calls the r language. /// Load the self-written R Language Algorithm Library public List GetZTFB (double [] data) {List par = new List (); try {// call the R Language Algorithm REngine. setEnvironmentVariables (