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How to implement keyboard hook in c#_Summary of the most comprehensive usage of keyboard hook in c#
SetWindowsHookEx is prone to failure in .NET6 because WH_KEYBOARD_LL requires the UI thread message loop, and the background thread call returns 0 (error 1428); blocking and hosting operations are prohibited in the callback; uninstallation must explicitly UnhookWindowsHookEx and prevent GC from recycling the delegate.
Apr 14, 2026 pm 09:21 PM
How to use for loop in c#_Correct usage and precautions of for loop in c#
The for loop must understand the execution timing and scope boundaries of the three-stage structure, otherwise it will easily lead to logic misalignment, variable leakage or infinite loops; the execution order of the three expressions is: initialization → judgment → loop body → iteration expression, which cannot be guessed based on intuition.
Apr 14, 2026 pm 09:18 PM
How to use Interlocked atomic operations in c#_A must-read introductory tutorial for newbies to c#Interlocked atomic operations
Multi-thread counting must use the Interlocked method instead of /--, because non-atomic operations will cause value leakage; Interlocked.Increment is suitable for 1 scenario, Add supports any integer increase or decrease, CompareExchange is the only CAS primitive, and all operations require ref variable addresses.
Apr 14, 2026 pm 09:15 PM
How to call WebAPI in c#_Best practices and common pitfalls of c#WebAPI
HttpClient should be reused as a single instance to avoid frequent creation that leads to port exhaustion and DNS cache invalidation; IHttpClientFactory uses PooledConnectionLifetime to solve the problem that DNS changes do not take effect; 401/403 and other status codes do not throw exceptions, and EnsureSuccessStatusCode needs to be called for verification; [FromBody] The main reason for binding failure is missing Content-Type, model parameterless constructor or non-nullable field verification failure.
Apr 14, 2026 pm 09:12 PM
c# How to traverse the keys and values in the dictionary_c# Detailed explanation of traversing the keys and values of the dictionary
Foreach traverses KeyValuePair is the safest and most commonly used method; traversing Keys/Values alone will lose association and may cause concurrency exceptions; modifying the dictionary during traversal will throw InvalidOperationException; multi-threads should use ConcurrentDictionary; Dictionary does not guarantee the insertion order.
Apr 14, 2026 pm 09:09 PM![How to create a Yarp reverse proxy in C#_C# YARP reverse proxy gateway configuration method tutorial [Practical]](https://img.php.cn/upload/article/202604/14/2026041421060993825.jpg?x-oss-process=image/resize,m_fill,h_135,w_240)
How to create a Yarp reverse proxy in C#_C# YARP reverse proxy gateway configuration method tutorial [Practical]
YARP does not need to manually create a proxy instance. The core relies on AddReverseProxy() registration and MapReverseProxy() mounting. The main reason for the failure of MapReverseProxy() is that the middleware sequence is wrong. It must be placed after UseRouting(), etc., and before app.Run(), and custom middleware must be explicitly wrapped in its callback.
Apr 14, 2026 pm 09:06 PM
How to read console input in c#_In-depth understanding and underlying principles of reading console input in c#
Console.ReadLine() is not stuck, but strictly waits for the Enter key to input a newline character before returning; this is common in situations where the input ends without a carriage return, or a newline character is missing at the end of the redirected file, etc.
Apr 14, 2026 pm 09:03 PM
How to define attributes in c#_Several common ways to define attributes in c#
C# should choose the simplest and safest way to define properties as needed. In most scenarios, public stringName{get;set;} can be used, but please note that the default value is null and there are potential null reference risks.
Apr 14, 2026 pm 09:00 PM![How to implement read-write separation in C#_C# EF Core read-write separation configuration method tutorial [Advanced]](https://img.php.cn/upload/article/202604/14/2026041420570544733.jpg?x-oss-process=image/resize,m_fill,h_135,w_240)
How to implement read-write separation in C#_C# EF Core read-write separation configuration method tutorial [Advanced]
EFCore itself does not support read-write separation. The only available solution is to determine the read-write route when DbContext is instantiated. It is recommended to register two independent types, WriteDbContext and ReadDbContext, bind the master-slave library connection string respectively, and split the warehousing interface to ensure operation isolation.
Apr 14, 2026 pm 08:57 PM![How to create a Redis distributed lock in C#_Detailed tutorial on C# distributed lock implementation method [Advanced]](https://img.php.cn/upload/article/202604/14/2026041420540529937.jpg?x-oss-process=image/resize,m_fill,h_135,w_240)
How to create a Redis distributed lock in C#_Detailed tutorial on C# distributed lock implementation method [Advanced]
StackExchange.Redis must meet four elements to implement distributed locks: unique lockValue, Lua script atomic verification release right, reasonable TTL (covering business P99×2), and watchdog automatic renewal. All are indispensable, otherwise it will easily lead to overselling and other production accidents.
Apr 14, 2026 pm 08:54 PM
How to use generic constraints in c#_In-depth understanding and underlying principles of generic constraints in c#
The new() constraint is a compile-time enforced type contract that requires generic parameters to have a public parameterless constructor; it does not generate IL instructions, but marks metadata and causes newT() to be compiled into an Activator.CreateInstance() call.
Apr 14, 2026 pm 08:51 PM![How to implement caching strategy in C#_C# IDistributedCache distributed cache [Advanced]](https://img.php.cn/upload/article/202604/14/2026041420480552120.jpg?x-oss-process=image/resize,m_fill,h_135,w_240)
How to implement caching strategy in C#_C# IDistributedCache distributed cache [Advanced]
IDistributedCache does not support sliding expiration because the Redis provider silently ignores SlidingExpiration, and only AbsoluteExpirationRelativeToNow takes effect; you need to manually RefreshAsync or use Redis native commands to implement atomic placeholder and cover.
Apr 14, 2026 pm 08:48 PM
c#How to use Dictionary dictionary_c#Dictionary dictionary project example with complete source code
Dictionary should be used with caution in C#: it is not thread-safe by default, and adding a repeated Key will throw an ArgumentException; use dict[key]=value or TryAdd instead of Add; TryGetValue has better performance than the ContainsKey indexer; custom classes must rewrite GetHashCode and Equals or use record as Key.
Apr 14, 2026 pm 08:45 PM
c#How to use Log4Net_c#Log4Net complete tutorial and code examples
Log4Net has stopped updating and does not support .NET6. New projects should give priority to Microsoft.Extensions.Logging; if compatibility with old systems is required, XmlConfigurator.Configure() must be called to complete unique initialization before GetLogger for the first time, and attention should be paid to path, permissions, and Core environment adaptation issues.
Apr 14, 2026 pm 08:42 PM
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