C # Study Notes 01

If you want to write an app that can access the database and query and modify the database, you suddenly find that the knowledge is limited. Therefore, you can select C # To implement this app. Use a simple three-tier architecture as the app

C # basics | preliminary reflection

Contains a lot of information. You have written a class that contains fields, attributes, and methods. Compilation stores the information in the Assembly. For the time being, call this information. It is certain that the program contains "(metadata),

A little progress every day _ lottery Program

Lottery program: You just need to click a button and rotate an image for a while to get a result. But this is not the requirement of this program. You need to randomly select users from the database, based on the specified level and number of people

Use WindowsAPICodePack for translation

Translation is limited to the following languages:    Explanation: the previous several languages that can be translated are provided by the system and not created by the bloggers. The above code gets all supported language translation functions

C # initial contact

Like many beginners, when I first came into contact with C #, I was confused. After learning for a long time, I was confused about some basic names. What is C #? What is. net? What is visual studio? What is the relationship between them? Let's start

How to solve the problem of card screen (slow running) in animation using C # drawing

I am using C # As a small game and need to use animation. The problem solved last time was the flash problem. I used double buffering technology. I thought there would be no problem. Later, when all the images were drawn, the problem still occurred.

Notes for using OleDbCommand Parameters

Recently, the program used the Parameter of OleDbCommand to write data to the database, and encountered many problems: 1. The ole db. NET Framework data provider and ODBC. NET Framework data provider do not support the named parameters used to pass

C #-Tree View TreeView --- ShinePans

Attribute Description Nodes Obtains the set of Tree nodes allocated to the Tree View control. PathSeparator Obtains or sets the delimiter string used by the tree node path. SelesctedNode Obtains or sets the

DataVeryLite getting started (2) Entity

.(,()()()()   =, IsPrimaryKey = Id {; = Name {; = Sex {; = Phone {; = Email {;   Main (person =  Partial field updates Person {Id =, Name =}. Update (); PersonById = ++ personById. Email ); + Person (). Count ); Person () {Id =}.

Automatic online software upgrade in C/S mode using C #

1 Preface For a long time, the majority of programmers have been arguing over whether to use Client/Server or Browser/Server structures. Among these arguments, C/S structures have poor program maintainability and difficult arrangement, the upgrade

Differences between new, override, and virtual keywords in C #

The OO idea has been widely used in software development projects. The most important feature is inheritance. Recently, I briefly reviewed the inheritance feature in C, the keywords that need to be used, including some key points, are specially

C # ref and out in the Method

RefWe usually pass the value to the method. the method obtains a copy of these values, and then uses these copies. After the method is run, these copies will be discarded, and the original values will not be affected. in addition, we have other

Imitating QQ screenshots

MouseIsDown = Rectangle MouseRect = p. x-= p. y-=. rectangleToScreen (Rectangle (, = Rectangle (StartPoint. x, StartPoint. y, button1_Click (barkPictureBox_MouseUp (=== (MouseRect. X = | MouseRect. Y = | MouseRect. width = | MouseRect. height =) =

[Dry goods] General static extension class

In the development process, we usually encapsulate common methods in a helper class to improve reusability. Since. net3.5 and later,. net has supported extension for classes using the this keyword. Currently, only static methods can be extended,

C #-ASCII, unicode --- ShinePans

Differences between ASCII and Unicode codes Using System; using System. collections. generic; using System. linq; using System. text; namespace AsciiText {class Program {static void Main (string [] args) {// The default unicode String str = "I live

Today, have you tried-Catch?

Main(= d = ( i = ; i iterations = = c = ( i = ; i c += i * ( * ()Math.Floor(()i));   : : Question 2: Since try-catch does not affect efficiency, why is it not recommended to use it like below? = = = =    The Exception

Cross-thread access control in C #

Net prohibits cross-thread access to controls in principle, because this may cause errors. We recommend that you use a proxy to indirectly operate controls not created by the same thread.The second method is to prohibit the compiler from checking

The performance of c ++, the capacity of c ?! The fish and the bear's paw can have both. net native's first look

For Microsoft developers, every BUILD conference is worth looking forward. This is also a big surprise. In addition to the popular WP8.1 release, there is also a technology that will make developers excited:. NET NATIVE. Let's take a closer look at

C # some basic knowledge

Variables and constants in C #C # basic data types: Value Type and reference typeValue Type: simple type, structure type, and enumeration type.Simple Type: integer, floating point, decimal, and BooleanSbyte is signed and equivalent to the byte type

Customize volunteer items and formulas

The function of defining wage formulas is a common practice in enterprise wage calculation, which is just as common as the formula in the Excel system. However, if a technician adds a formula system to a program he or she wants to develop, he or she

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