using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading; using System.Runtime.Remoting.Messaging; namespace ConsoleApplication1 { public delegate int AddHandler(int a, int b); public class AddMethod { public static int Add(int a, int b) { Console.WriteLine("开始计算:" + a + "+" + b); Thread.Sleep(3000); //模拟该方法运行三秒 Console.WriteLine("计算完成!"); return a + b; } } //**************同步调用*********** //委托的Invoke方法用来进行同步调用。同步调用也可以叫阻塞调用,它将阻塞当前线程,然后执行调用,调用完毕后再继续向下进行。 //**************异步调用*********** //异步调用不阻塞线程,而是把调用塞到线程池中,程序主线程或UI线程可以继续执行。 //委托的异步调用通过BeginInvoke和EndInvoke来实现。 //**************异步回调*********** //用回调函数,当调用结束时会自动调用回调函数,解决了为等待调用结果,而让线程依旧被阻塞的局面。 //注意: BeginInvoke和EndInvoke必须成对调用.即使不需要返回值,但EndInvoke还是必须调用,否则可能会造成内存泄漏。 class Program { static void Main(string[] args) { Console.WriteLine("===== 同步调用 SyncInvokeTest ====="); AddHandler handler = new AddHandler(AddMethod.Add); int result=handler.Invoke(1,2); Console.WriteLine("继续做别的事情。。。"); Console.WriteLine(result); Console.ReadKey(); Console.WriteLine("===== 异步调用 AsyncInvokeTest ====="); AddHandler handler1 = new AddHandler(AddMethod.Add); IAsyncResult result1=handler1.BeginInvoke(1,2,null,null); Console.WriteLine("继续做别的事情。。。"); //异步操作返回 Console.WriteLine(handler1.EndInvoke(result1)); Console.ReadKey(); Console.WriteLine("===== 异步回调 AsyncInvokeTest ====="); AddHandler handler2 = new AddHandler(AddMethod.Add); IAsyncResult result2 = handler2.BeginInvoke(1, 2, new AsyncCallback(Callback), null); Console.WriteLine("继续做别的事情。。。"); Console.ReadKey(); //异步委托,也可以参考如下写法: //Action<object> action=(obj)=>method(obj); //action.BeginInvoke(obj,ar=>action.EndInvoke(ar),null); //简简单单两句话就可以完成一部操作。 } static void Callback(IAsyncResult result) { AddHandler handler = (AddHandler)((AsyncResult)result).AsyncDelegate; Console.WriteLine(handler.EndInvoke(result)); } } }

C# is widely used in enterprise-level applications, game development, mobile applications and web development. 1) In enterprise-level applications, C# is often used for ASP.NETCore to develop WebAPI. 2) In game development, C# is combined with the Unity engine to realize role control and other functions. 3) C# supports polymorphism and asynchronous programming to improve code flexibility and application performance.

C# and .NET are suitable for web, desktop and mobile development. 1) In web development, ASP.NETCore supports cross-platform development. 2) Desktop development uses WPF and WinForms, which are suitable for different needs. 3) Mobile development realizes cross-platform applications through Xamarin.

The C#.NET ecosystem provides rich frameworks and libraries to help developers build applications efficiently. 1.ASP.NETCore is used to build high-performance web applications, 2.EntityFrameworkCore is used for database operations. By understanding the use and best practices of these tools, developers can improve the quality and performance of their applications.

How to deploy a C# .NET app to Azure or AWS? The answer is to use AzureAppService and AWSElasticBeanstalk. 1. On Azure, automate deployment using AzureAppService and AzurePipelines. 2. On AWS, use Amazon ElasticBeanstalk and AWSLambda to implement deployment and serverless compute.

The combination of C# and .NET provides developers with a powerful programming environment. 1) C# supports polymorphism and asynchronous programming, 2) .NET provides cross-platform capabilities and concurrent processing mechanisms, which makes them widely used in desktop, web and mobile application development.

.NETFramework is a software framework, and C# is a programming language. 1..NETFramework provides libraries and services, supporting desktop, web and mobile application development. 2.C# is designed for .NETFramework and supports modern programming functions. 3..NETFramework manages code execution through CLR, and the C# code is compiled into IL and runs by CLR. 4. Use .NETFramework to quickly develop applications, and C# provides advanced functions such as LINQ. 5. Common errors include type conversion and asynchronous programming deadlocks. VisualStudio tools are required for debugging.

C# is a modern, object-oriented programming language developed by Microsoft, and .NET is a development framework provided by Microsoft. C# combines the performance of C and the simplicity of Java, and is suitable for building various applications. The .NET framework supports multiple languages, provides garbage collection mechanisms, and simplifies memory management.

C# and .NET runtime work closely together to empower developers to efficient, powerful and cross-platform development capabilities. 1) C# is a type-safe and object-oriented programming language designed to integrate seamlessly with the .NET framework. 2) The .NET runtime manages the execution of C# code, provides garbage collection, type safety and other services, and ensures efficient and cross-platform operation.


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