Page 7-C#.Net Tutorial Programming Tutorials: Learn C#.Net Tutorial Online-php.cn

Article Tags

Home

Technical Articles

Backend Development

C#.Net Tutorial

Understanding and Avoiding Deadlocks in C# Multithreading

Deadlock refers to the state in which two or more threads are waiting for each other to release resources, causing the program to be unable to continue execution. Its causes include four necessary conditions: mutual exclusion, holding and waiting, non-preemption and circular waiting. Common scenarios include nested locks and deadlocks in asynchronous code, such as using .Result or .Wait() in UI threads. Strategies to avoid deadlock include: 1. Unify the locking order to eliminate loop waiting; 2. Reduce the granularity and holding time of the lock; 3. Use timeout mechanisms such as Monitor.TryEnter; 4. Avoid calling external methods within the lock; 5. Try to use advanced concurrent structures such as ConcurrentDictionary or async/await. Debugging tips include using debuggers, parallel stacks

Jul 13, 2025 am 01:04 AM

deadlock c#multithreading

Integrating C# Applications with Message Queues

The key to connecting C# applications and message queues is to select the right components, design the structure, and cooperate with asynchronous processing logic. 1. Select the appropriate message queue middleware: RabbitMQ is suitable for internal system decoupling, Kafka is suitable for big data or log collection, AzureServiceBus is suitable for Azure cloud-native applications; 2. Use mainstream client libraries to simplify integration: such as MassTransit or EasyNetQ is used for RabbitMQ, Confluent.Kafka or dotnet-kafka is used for Kafka, Azure.Messaging.ServiceBus is used for ServiceBus; 3. Implement asynchronous processing and error retry mechanism:

Jul 13, 2025 am 12:37 AM

Writing Maintainable and Testable C# Code

The key to writing C# code well is maintainability and testability. Reasonably divide responsibilities, follow the single responsibility principle (SRP), and take data access, business logic and request processing by Repository, Service and Controller respectively to improve structural clarity and testing efficiency. Multi-purpose interface and dependency injection (DI) facilitate replacement implementation, extension of functions and simulation testing. Unit testing should isolate external dependencies and use Mock tools to verify logic to ensure fast and stable execution. Standardize naming and splitting small functions to improve readability and maintenance efficiency. Adhering to the principles of clear structure, clear responsibilities and test-friendly can significantly improve development efficiency and code quality.

Jul 12, 2025 am 02:08 AM

code c#

Deep Dive into C# Generics Constraints and Covariance

Generic constraints are used to restrict type parameters to ensure specific behavior or inheritance relationships, while covariation allows subtype conversion. For example, whereT:IComparable ensures that T is comparable; covariation such as IEnumerable allows IEnumerable to be converted to IEnumerable, but it is only read and cannot be modified. Common constraints include class, struct, new(), base class and interface, and multiple constraints are separated by commas; covariation requires the out keyword and is only applicable to interfaces and delegates, which is different from inverter (in keyword). Note that covariance does not support classes, cannot be converted at will, and constraints affect flexibility.

Jul 12, 2025 am 02:00 AM

C# Generics Generic constraints

Creating Custom Middleware in ASP.NET Core C#

Create custom middleware in ASP.NETCore, which can be implemented by writing classes and registering. 1. Create a class containing the InvokeAsync method, handle HttpContext and RequestDelegatenext; 2. Register with UseMiddleware in Program.cs. Middleware is suitable for general operations such as logging, performance monitoring, exception handling, etc. Unlike MVC filters, it acts on the entire application and does not rely on the controller. Rational use of middleware can improve structural flexibility, but should avoid affecting performance.

Jul 11, 2025 am 01:55 AM

middleware

Implementing Caching Strategies in C# Applications

CachinginC#applicationscanbeeffectivelyimplementedusingin-memorycaching,Redisfordistributedscenarios,andproperinvalidationstrategies.UseIMemoryCacheforfastlocalcachingwithexpirationpolicies,RedisviaStackExchange.Redisforsharedorlarge-scalecaching,and

Jul 11, 2025 am 01:14 AM

cache c#

Implementing Fluent Interfaces with C# Extension Methods

Fluent interface is a design method that improves code readability and expressivity through chain calls. The core of it is that each method returns the current object, so that multiple operations can be called continuously, such as varresult=newStringBuilder().Append("Hello").Append("").Append("World"). When implementing, you need to combine the extension method and the design pattern that returns this, such as defining the FluentString class and returning this in its method, and creating an initial instance through the extension method. Common application scenarios include building configurators (such as verification rules), checking

Jul 10, 2025 pm 01:08 PM

Implementing Unit Testing for C# Codebases

Unit testing is an important means to ensure code quality in C# projects and must be implemented. 1. Select the appropriate testing framework: such as xUnit, NUnit or MSTest, and decide based on team habits or project needs; 2. Reasonably organize the test code: establish a test structure according to the main project structure image, and each test method only tests one behavior, keep it concise and clear; 3. Use the Mock framework to isolate dependencies: such as Moq or NSubstitute, simulate external dependencies to ensure test independence; 4. Automatically run tests and integrate CI/CD: configure automatic testing in GitHubActions and other processes to prevent error merging, and can be set to run automatically during local development.

Jul 10, 2025 pm 12:43 PM

unit test c#

Best Practices for Using LINQ in C# Effectively

The following points should be followed when using LINQ: 1. Priority is given to LINQ when using declarative data operations such as filtering, converting or aggregating data to avoid forced use in scenarios with side effects or performance-critical scenarios; 2. Understand the characteristics of delayed execution, source set modifications may lead to unexpected results, and delays or execution should be selected according to requirements; 3. Pay attention to performance and memory overhead, chain calls may generate intermediate objects, and performance-sensitive codes can be replaced by loops or spans; 4. Keep the query concise and easy to read, and split complex logic into multiple steps to avoid excessive nesting and mixing of multiple operations.

Jul 09, 2025 am 01:04 AM

Understanding the C# Eventing Model in Depth

Events are the core mechanism for implementing observer patterns in C#. It allows an object to notify the occurrence of a specific action without being tightly coupled to other objects. Events are essentially encapsulation of delegates, allowing classes to expose subscription methods without giving call control. For example, the Click event in the Button class is based on the EventHandler delegation. When the button is clicked, the OnClick method will be called to trigger the event. Key points include: 1. Events can only be called by the class that declares them; 2. Subscribers can dynamically add or remove handlers at runtime. When defining custom events, you can create a class that inherits EventArgs and the corresponding delegate, such as FileWatcher class passing through FileChanged

Jul 09, 2025 am 12:19 AM

Handling Nullable Reference Types in Modern C#

The reference type cannot be nulled by default after enabling the nullable context. 1. Use string? to explicitly allow null, which is applicable to database fields, API optional attributes, etc. 2. Enable the method to enable or use #nullableenable for a single file. 3. Use [MaybeNull] and [MemberNotNull] to avoid misjudgment. 4. Use null check or ! operator to assist the compiler inferring the non-null state of the variables, thereby discovering potential null values in advance and improving code robustness.

Jul 08, 2025 am 01:08 AM

Exploring Interop with Unmanaged Code in C#

Interaction with unmanaged code in C# can be implemented through P/Invoke, COMInterop, C/CLI and unsafe code. 1.P/Invoke is used to call local DLL functions, pay attention to calling conventions, data type matching and string processing; 2.COMInterop is suitable for interaction with COM components and implemented through RCW; 3.C/CLI is suitable for complex scenarios and provides mixed code control; 4. Unsafe code supports pointer operation but risks are present. When using it, you need to avoid signature errors, memory leaks, exceptions and platform differences.

Jul 08, 2025 am 12:35 AM

Exploring New Language Features in Recent C# Versions

New features of C# improve the security, simplicity and maintainability of the code. First, Nullable reference types help prevent null reference exceptions through compile-time checking, such as using string? or null-forgiving operators for variables that may be null. Secondly, Records simplifies the creation of immutable models, automatically generates constructors, attributes and equality checks, and supports copy-modification mode. Finally, top-level statements reduce boilerplate code for small projects, allowing direct writing of entry logic without the need for explicit Main methods. These improvements make C# more modern and efficient.

Jul 07, 2025 am 12:28 AM

c# language features

Creating and Applying Custom Attributes in C#

CustomAttributes are mechanisms used in C# to attach metadata to code elements. Its core function is to inherit the System.Attribute class and read through reflection at runtime to implement functions such as logging, permission control, etc. Specifically, it includes: 1. CustomAttributes are declarative information, which exists in the form of feature classes, and are often used to mark classes, methods, etc.; 2. When creating, you need to define a class inherited from Attribute, and use AttributeUsage to specify the application target; 3. After application, you can obtain feature information through reflection, such as using Attribute.GetCustomAttribute();

Jul 07, 2025 am 12:03 AM

Custom properties c#