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C # Multithreading practices-Lock and thread safety

, which will work, but only when all programmers agree to do so. While this is unreliable, locking a type is considered a very bad thing. For these reasons, static members on DateTime are thread-safe, a common pattern throughout the. NET framework-static members are thread-safe, while one instance member is not. From this mode you can also get some experience when writing custom types, do not create a problem that cannot be thread-safe!When it comes to writing common components, the good habit i

Numerical limitations------C + + programming principles and Practices (advanced)

Tag: A sign Eric indicates the value with document Oat SentinelEach C + + implementation identifies properties of built-in types in #include coutIf you are writing a program that will be used on a variety of hardware platforms, it is valuable to get the information in the program. Another approach is to hard code this information into the program, but this is disastrous for maintenance personnel.These property values are also useful for overflow detec

Performance Optimization practices of C ++

Performance Optimization practices of C ++Contents of C ++ performance optimization practices: 1 Gprof 2. gprof usage steps 1. Time consumed for initializing large objects 2. Improper Map use Optimization criteria: 1. the 20% rule: in any group of things, the most important part is only a small part, about 80%, an

C # DataSet Performance Best Practices

row selection of the DataTable is performed, while the performance of the rows is similar. 3, using ImportRow to achieve the same structure DataTable merger Using the merge method makes it easy to merge the DataTable, but the merge is very inefficient, and the example is as follows:datatable[] Srctables = ...; foreach (DataTable src in srctables) {dest. Merge (SRC);} ImportRow can also implement a DataTable merge, which is much higher performance than merge. The code examples are

Several practices for loading interfaces in C #

1.Methods of using Event delegatesObjects: Main form: frmmain load form: frmloadingIdeas:Show Form frmloading before the main form loads, when the main form is finished loading (the first time it is displayed), close frmloadingThe C # code looks like thisUsing System;Using System.Collections.Generic;Using System.ComponentModel;Using System.Data;Using System.Drawing;Using System.Linq;Using System.Text;Using System.Windows.Forms;Using System.Threading;N

C # Ioc, DI, Unity, TDD ideas and practices

test project, add the reference, compile the pass, run the test:Not TDD?Iv. Main Program1. Adding the console project2. Add Unity (5.8.6) package3. Modify the app. config to: -4. Reference interfaceThe 5.Main method is as follows: static void Main (string[] args) { var container = new UnityContainer (); unityconfigurationsection config = (unityconfigurationsection) configurationmanager.getsection ( Unityconfigurationsection.sectionname); "Locka");

C # Multithreading practices-creating and starting to use

Threads are created with the thread class, and the ThreadStart delegate is used to indicate where the method begins to run. ThreadStart's statement is as follows:public delegate void ThreadStart ();After the Start method is called, the thread begins to run until the method it invokes returns to the end.Class ThreadTest { static void Main () { thread t = new Thread (new ThreadStart (Go)); T.start (); Go (); } static void Go () {Console.WriteLine ("hello!");}A thread can be

Bitest (bit set)------C + + programming principles and Practices (advanced)

stream looks for 0 and 1, for example, if you enter the following:10121Input stream will be read into 101,21 will be left.For bytes and words, the bits in the bitset are numbered from right to left (from the least significant bit to the most significant bit). Thus, the value of the 7th bit is 27; 7: 6: 5: 4: 3: 2: 1: 0: 1 0 1 0 0 1 1 1 For Bitset, the numbering sequence is not just a

Well-designed Component-Based C # win forms practices a framework database drives multiple business logic Databases

Design a flexible and stable multi-layer architectureProgramIt is not easy. With mature models and applications, you also need to experience various applications and requirements. To put it bluntly, you must be able to withstand the difficulties. Recently, when restructuring your EPN framework, I have some new experiences and practices to share with you. The first is the database design. A framework database drives multiple business logic databases,

C # Basic Knowledge practices

1.c# has a lot of built-in types, and it needs to declare variables and operate on that basis, discovering something that was previously unknown: characters can be typed according to ASCIIThere is also a type conversion to be aware that the range of the assigned object must not be less than the range of the assignment variable, it is necessary to force the scope of the subsequent variable to be reduced by the display conversion and also to ensure that

C # programming practices for detecting data migration plug-ins,

C # programming practices for detecting data migration plug-ins, This blog is based on a small plug-in currently written. Simply put, some data in a table in a database is migrated to another location in the table, two different IDs are passed in to verify whether the migration is successful. In this process, I have gained a lot of practical knowledge, which is summarized in the following two aspects: the

C # DataSet performance best practices

C # DataSet performance best practices 1. Use ItemArray to assign values to DataRow in batches When assigning values to all fields of DataRow, it is inefficient to assign values by column using field names. In this case, use batch field assignment whenever possible. You can use ItemArray or rows. Add: /Ds is the data set (DataSet) object DataTable dt = ds. tables [0]; DataRow row = dt. newRow (); row. itemA

Problems with dynamic memory allocation (memory hole)------C + + programming principles and Practices (advanced)

Where is the question of new? In fact, the problem is with the combination of new and delete. Examine the memory allocation and release process in the following program:while (1) { big* p=new Big;//...... small* n1=new Small;//...... Delete p; small* n2=new Small;//......}In each loop step, we created two small, during which we also allocated a big and then released it. Looking at this code, we may expect to "consume" 2*sizeof (Small) bytes of memory (plus the additional overhead of

C Programming Best Practices (writing style)

Brief introductionThis article is written to meet the needs of developers. We've summed up a set of guidelines that, as a developer or consultant, have guided us well over the years, and we've provided them as a recommendation to help you with your work. You may not agree with some of these guidelines, but we hope you will like some of them and use them in your programming or porting projects.Style and guide* Use a source style that makes your code readable and consistent. If you don't have a te

Objective-C and Cocoa programming Best Practices

DiscussionObjective-CAndCocoa ProgrammingThe best practice is the content to be introduced in this article. In the latest tietong in MarchProgrammingLanguage ranking,Objective-CThe share is still growing sharply, and is constantly approaching the ranks of the most popular languages. On StackOverflow, a well-known foreign technical Q A website, the question with the highest Objective-C tag score is "What are best

Effective c++--55 specific practices for improving procedures and design (iii)

your program.3. When the const and NON-CONST member functions have a substantially equivalent implementation, making the NON-CONST version call the const version avoids code duplication . Article 01: Treat C + + as a language federalWater and electricityArticle 01: Treat C + + as a language federalWater and electricityArticle 01: Treat C + + as a language federa

C # performance optimization practices (1)

C # performance optimization practices Performance is an important indicator to consider the quality of a software product. It plays an equally important role in product functions. When you select a software product, you will test and compare the performance of similar products. It is one of the important factors for purchasing the software.Performance of Software refers to performance optimization princip

Agile Software Development: principles, patterns and practices--the 13th chapter of UML Overview for C # Programmers

to change.Translate into natural language description: If the coin event is received in the locked state, it is migrated to the unlocked state and the unlock function is called. If the pass event is received in the unlocked state, it is migrated to the locked state and the lock function is called. If the coin event is received in the unlocked state, it remains in the unlocked state and calls the Thankyou function. If the pass event is received in the locked state, it remain

GeekBand-geek class-C ++ algorithm principles and practices-dong Fei-Course Notes (1), geekband-dong Fei

GeekBand-geek class-C ++ algorithm principles and practices-dong Fei-Course Notes (1), geekband-dong FeiGeekBand-geek class-C ++ algorithm principles and practices-dong Fei-Course Notes (I) Introduction to algorithms and programming styles /*StrStrReturns the position of the first occurrence of string get in string sou

One of the practices of C-language embedded system programming: Background

One of the practices of C-language embedded system programming: Background Different from general software programming, embedded system programming is based on a specific hardware platform, which is bound to requireProgramming LanguageStrong hardware operation capability. Undoubtedly, assembly language has such characteristics. However, due to the complexity of the assembly language development process, i

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