What is ASP.NET MVC
ASP.NET MVC is an MVC model website application development framework officially launched by Microsoft based on ASP.NET.
The official website is: http://www.asp.net/mvc.
The first version of ASP.NET MVC was the RTM version released on March 17, 2009. Since its launch, it has been welcomed by programmers.
The latest ASP.NET MVC 3.0 was officially released on January 13, 2011.
ASP.NET MVC download address for each version: (admin10000.com Organized)
ASP.NET MVC 1.0 http://www.microsoft.com/download/en/details.aspx?id=5388
This version is applicable For Visual Studio 2008 and Visual Web Developer 2008 Express based on the ASP.NET 3.5 platform.
ASP.NET MVC 2.0 http://www.microsoft.com/download/en/details.aspx?id=22079
This version is suitable for Visual Studio 2008 and Visual Web Developer 2008 Express based on the ASP.NET 3.5 platform .
ASP.NET MVC 3.0 http://www.microsoft.com/download/en/details.aspx?id=4211
This version is suitable for Visual Studio 2010 and Visual Web Developer 2010 Express based on the ASP.NET 4.0 platform .
Usage Tips
1. After downloading, you will get an .msi installation file, double-click to install.
2. Different versions of ASP.NET MVC can coexist, which means that on the same machine, some programs can use ASP.NET MVC 1 and some programs can use ASP.NET MVC 2.
3. ASP.NET MVC 2.0 is integrated by default in Visual Studio 2010 and there is no need to download it separately.
MVC divides a web application into three parts: Model View and Controller. The ASP.NET MVC framework provides an MVC-based application that can replace ASP.NET WEB forms.
Advantages of MVC:
1. By dividing the project into model view and controller, complex projects are easier to maintain.
2. Without using view state and server form controls, it is more convenient to control the behavior of the application
3. The application controls program requests through the controller, which can provide rich url rewriting.
4. Better support for unit testing
5. Better performance in team development mode
Advantages of Web Forms
1. Use event-driven mode to control application requests, supported by a large number of server controls
2. Using the page control mechanism, event processing functions can be added to a single page.
3. Use view state and server-side pages to make managing page status information easier.
4. It is more convenient for smaller development teams who want to use server-side controls.
5. It is easier and simpler to develop than the mvc model.
MVC Framework Features
1. Separation of tasks (input logic, business logic and display logic), easy testability and default test-driven components. All components used by MVC are based on interfaces and can be tested by mock objects. You can use the tests without running the controller in the ASP.NET process. Makes testing faster and simpler.
2. Extensible and simple framework. The mvc framework is designed to make porting and customization easier. You can add your own view engine and url rewriting strategy. Overload action methods, etc. mvc also supports Dependency Injection (DI) and Inversion of Control (IOC)
3. The powerful url rewriting mechanism allows you to more conveniently create understandable and searchable urls. The url can not contain any file extension, and the url can be rewritten to make it more search engine friendly.
4. You can use existing page tags, user controls, and template pages of asp.net. You can use nested template pages, embed expressions , declare server controls, templates, data binding, positioning, etc.
5. Support for existing asp.net programs, mvc allows you to use forms authentication and windows authentication, url authentication, group management and rules, output, data caching, session, profile, health monitoring, configuration management System, provider architecture characteristics.

The relationship between C# and .NET is inseparable, but they are not the same thing. C# is a programming language, while .NET is a development platform. C# is used to write code, compile into .NET's intermediate language (IL), and executed by the .NET runtime (CLR).

C#.NET is still important because it provides powerful tools and libraries that support multiple application development. 1) C# combines .NET framework to make development efficient and convenient. 2) C#'s type safety and garbage collection mechanism enhance its advantages. 3) .NET provides a cross-platform running environment and rich APIs, improving development flexibility.

C#.NETisversatileforbothwebanddesktopdevelopment.1)Forweb,useASP.NETfordynamicapplications.2)Fordesktop,employWindowsFormsorWPFforrichinterfaces.3)UseXamarinforcross-platformdevelopment,enablingcodesharingacrossWindows,macOS,Linux,andmobiledevices.

C# and .NET adapt to the needs of emerging technologies through continuous updates and optimizations. 1) C# 9.0 and .NET5 introduce record type and performance optimization. 2) .NETCore enhances cloud native and containerized support. 3) ASP.NETCore integrates with modern web technologies. 4) ML.NET supports machine learning and artificial intelligence. 5) Asynchronous programming and best practices improve performance.

C#.NETissuitableforenterprise-levelapplicationswithintheMicrosoftecosystemduetoitsstrongtyping,richlibraries,androbustperformance.However,itmaynotbeidealforcross-platformdevelopmentorwhenrawspeediscritical,wherelanguageslikeRustorGomightbepreferable.

The programming process of C# in .NET includes the following steps: 1) writing C# code, 2) compiling into an intermediate language (IL), and 3) executing by the .NET runtime (CLR). The advantages of C# in .NET are its modern syntax, powerful type system and tight integration with the .NET framework, suitable for various development scenarios from desktop applications to web services.

C# is a modern, object-oriented programming language developed by Microsoft and as part of the .NET framework. 1.C# supports object-oriented programming (OOP), including encapsulation, inheritance and polymorphism. 2. Asynchronous programming in C# is implemented through async and await keywords to improve application responsiveness. 3. Use LINQ to process data collections concisely. 4. Common errors include null reference exceptions and index out-of-range exceptions. Debugging skills include using a debugger and exception handling. 5. Performance optimization includes using StringBuilder and avoiding unnecessary packing and unboxing.

Testing strategies for C#.NET applications include unit testing, integration testing, and end-to-end testing. 1. Unit testing ensures that the minimum unit of the code works independently, using the MSTest, NUnit or xUnit framework. 2. Integrated tests verify the functions of multiple units combined, commonly used simulated data and external services. 3. End-to-end testing simulates the user's complete operation process, and Selenium is usually used for automated testing.


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