Detailed explanation of the usage of new in C++

In C#, the main difference between delegates and events is in purpose and access control. 1. Delegates are type-safe function pointers used to reference methods and indirectly call them, suitable for callback mechanisms, asynchronous programming and policy patterns; 2. Events are based on delegates, providing additional access restrictions, allowing subscriptions and unsubscribes but prohibiting external direct calls or reassignments, suitable for publish-subscribe models and GUI programming; 3. Using events rather than public delegates can prevent external code from arbitrarily modifying or triggering the delegate list, enhancing encapsulation and security; 4. Delegations are suitable for scenarios where methods are required, while events are more suitable for public API designs that require multiple subscribers to respond and control calls.

To write high-performance C# code, the core is to understand language features and make rational use of resources. 1. Use structures instead of classes when appropriate to reduce garbage collection pressure, and is suitable for objects with small data volumes and short life cycles. 2. Avoid frequent memory allocation, especially in loops. It is recommended to use StringBuilder, Span and pre-allocated collection capacity to reduce heap allocation. 3. Use asynchronous programming to optimize I/O operations, use async/await to avoid thread blocking, and use ConfigureAwait(false) reasonably to reduce context switching overhead. 4. Use inline functions and Span operations for performance-sensitive code paths to improve execution efficiency and reduce unnecessary copies. These

C#.NETMAUI is a cross-platform application development framework that unifies desktop and mobile platforms. Compared with Xamarin.Forms, MAUI expands to support native application development of Windows, macOS, Android and iOS, and is suitable for developers familiar with the C# and .NET ecosystems. The project structure includes platform-specific directories and shared code layers for easy customization and reuse. Before development, you need to install VisualStudio or VSCode and enable MAUI workloads. It is recommended to use the command line dotnetworkloadinstallmaui to ensure the complete components. The interface is defined using XAML, it is recommended to combine Grid and StackLayout layout, and use On

The key to creating a NuGet package is to understand the process and configuration details. The main steps are as follows: 1. Make sure that the project is a .NETStandard or .NETCore/.NET5 class library project, and add metadata (such as version number, author, etc.) in the .csproj file; 2. Use the dotnetCLI command line tool to package, run dotnetpack-cRelease to generate the .nupkg file, or automatically generate the package when you build the project through the VisualStudio graphical interface; 3. Optionally, use the dotnetnugetpush command to publish the package to NuGet.org, and register it.

Whether to choose an array or a List depends on the scene. 1. Use arrays first when data is fixed, because the fixed-length feature is lighter, suitable for graphics processing, underlying API and other scenarios; 2. Use List when dynamic expansion or frequent addition and deletion, because it automatically expands and provides rich methods to improve development efficiency; 3. In terms of performance, array memory is more compact, List has management overhead but can be optimized through pre-allocated capacity; 4. The access speeds are similar, but the array does not support direct addition and deletion, and the inter-insertion efficiency of List is low. Just make reasonable choices based on the data volume, operating frequency and performance requirements.

Top-levelstatementsinC#9simplifycodeforsmallprogramsbyeliminatingtheneedforexplicitclassesandMainmethods.Theyallowdirectexecutionofcode,idealforscripts,learning,andprototyping.Youcanuseusingdirectives,declarevariables,useawait,andreturnexitcodes,butc

In C#, the main difference between value types and reference types is data storage and assignment behavior. 1. The value type directly stores data. When assigning, copy the value itself, such as int, float, struct and enum, modifying one variable does not affect the other; 2. The reference type stores references to the data, and copying the reference when assigning, such as class, interface and delegate, modifying one variable will affect the other; 3. The value type is usually stored on the stack, while the reference type object is allocated on the heap; 4. The value type cannot be null by default (unless the nullable type is used), and the reference type can be set to null; 5. Comparison of the actual value when comparing the value type, and compare the reference address when comparing the reference type (except

When handling file streams and I/O operations in C#, you need to master core classes and modes such as FileStream, StreamReader, asynchronous I/O and path processing. 1. Use FileStream to perform underlying file operations, support synchronization/asynchronous and access mode control, and use should ensure resource release and pay attention to FileMode and FileShare settings; 2. StreamReader and StreamWriter provide text read and write encapsulation, which is simpler and easier to use, can specify encoding methods, and can simplify one-time operations by File.ReadAllText() and other applications; 3. Asynchronous I/O improves responsiveness through async/await, suitable for large files or networks