C#

Implement UniqueAttribute uniqueness constraints and sqlunique Constraints Using System; using System. componentModel. dataAnnotations; using System. data. entity; namespace Zwj. TEMS. base {// /// Unique Identifier /// [AttributeUsage

Comparison of several methods of string inversion and several methods of string Inversion The following code is used first: Class Program {static void Main (string [] args) {string str = "12345"; const int count = 10000; Stopwatch sw = Stopwatch.

The differences between IEnumerable and IQueryable, as well as the ExpressionTree Expression Tree and cronexpression expression For the difference between IEnumerable and IQueryable, we need to start with the generic commissioned Func . Let's look

C # the AES encryption/decryption algorithm in java, I. C # AES encryption and decryption algorithm public class AESCode { public string Key { get; set; } public string Encrypt(string val) { if

[C # advanced series] Topic 2: Do you know why Dictionary search is fast ?,I. Preface In the previous interview, I was asked if you understand the internal implementation mechanism of Dictionary? At that time, it was just a simple question and

Understand the basic working principles of the garbage collection platform and the working principles of the garbage collection platform Understand the basic working principles of the garbage collection platform Each program has different resources,

Solution to the "program stopped working" problem.Problem An error occurs when a program cannot be opened, The problem details are as follows: Question signature:Problem event name: CLR20r3Problem signature 01: rdh-idss.exeQuestion signature 02. 0.1

Csharp: FlowLayoutPanel, csharp /// /// add control method /// /// public System. windows. forms. textBox AddNewTextBox () {Point p = new Point (); System. windows. forms. comboBox cmb = new ComboBox (); cmb. dataSource = setCmb (); cmb.

Delegation, generic delegation, Func and Action , funcaction The general idea of using delegation to do some things is: 1. Define and declare a delegate that specifies the input parameter and output type.2. Write several methods that conform to

TakeWhile, TakeWhile, and linqtakewhile in Linq These two concepts are easy to confuse and understand. Then I will write them here to facilitate memory.     SkipWhile can be understood as if the condition is met, it will always skip and retrieve

C # Enumeration type, The enumerated type is composed of a group of Integer constants and supports the following basic types: byte, sbyte, short, ushort, int, unit, long, And ulong. Default Enumeration type: int. 1. one of the advantages of

Convert the date and time to make it display more friendly and convert the date and time Sometimes we want to display the time and date in a more friendly way, such as a few seconds ago, a few minutes ago, a few hours ago ......   Here:1. Check

C # DataGridView. What should I do when right-clicking RowHeader and right-clicking the menu ?,    private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)        {            if( e.ColumnIndex==-1)            {               

C # development journey-preparation stage, I recently started to learn the development related content, record it, and gradually develop the habit! 1. Apply for a public account: the public account is divided into a subscription account and a

The differences between I ++ and I in C, I believe that the code writers are no stranger to I ++ and I, but do you fully understand these two methods? The following describes their differences. Simply put, I ++ is used first, and ++ I is used first.

Using C # for DirectX development, The Manage DirectX section of DirectX 9.0 contains the following nine sets. Microsoft. directX. audioVideoPlayback. dll Microsoft. directX. diagnostics. dll Microsoft. directX. direct3D. dll Microsoft. directX.

Unity mobile game Path automatic search for Navmesh jumps, climbs, slopes,Reprinted Unity mobile game road automatic Pathfinder Navmesh jump, climb, Slope Classification: unity2013-12-27 6545 people read comments (5) collection reports

8. Generic and genericFirst of all, it is a hydrology, because the text content is relatively dry, mainly some introductions and concepts. However, understanding generics is helpful. There is not much code to explain. Introduction :. after net2.0

Cainiao notes-ref and out parameters (parameter transfer), refout 1. Introduction Problems Example: Write a method to calculate the sum and maximum and minimum values of each element in the int array.* The purpose is to return three value-type

C # syntactic sugar, The first thing to declare is that the word "syntactic sugar" is not a negative term. It can bring convenience to me. It is a convenient way of writing. The compiler will help us with the conversion; in addition, it can improve