1. The origin of .NET Core

When it comes to .NET Core, we must not mention its predecessor.NET. Java was in the limelight at that time, and Microsoft also favored Java. The Java virtual machine on the Windows platform was developed by Microsoft based on JVM standards. It is said to be the best performance Java virtual machine at that time. However, Microsoft has its own little abacus, trying to bundle Java with the Windows platform and add some Windows-specific features. Sun's dissatisfaction with this led to a breakdown of the relationship between the two parties, and Microsoft then launched .NET. .NET has borrowed many features of Java since its inception and gradually surpassed Java in language features and form development. Java developed slowly after version 1.6, and later borrowed from .NET in language features, partly due to Sun's poor performance. http://ipnx.cn/link/7337bc5b4a00fa2ee237cf50a57b288d

Although .NET has been developing well and competitive frameworks such as WPF and Unity3D have emerged, .NET is not popular in some large projects, especially Internet companies. This is because .NET is not open source or cross-platform, which leads to the following problems:

Cost: Choosing .NET means choosing Visual Studio and Windows Server, and the license fee is a cost that cannot be ignored. Ecology: Without community contribution, .NET is difficult to nurture an excellent framework. Talent: It is impossible to attract excellent engineers from front-line Internet companies because they prefer to use Java, PHP, etc. Although there is a powerful framework like Mono that allows .NET to run on Linux, this is not enough because Mono can only play some of the functions of .NET. In addition, with the rise of container technology, the strong dependence of .NET and Windows makes it difficult to adapt to new technologies such as Docker. In short, due to the situation, Microsoft launched .NET Core.

2. The difference between .NET Core and .NET Framework. .NET Core is an open source and cross-platform version of .NET Framework. Although .NET Core is an open source version of the .NET Framework, Microsoft cannot maintain two different branches at the same time, one running on Windows and the other running on Linux (Unix Like) systems. Therefore, Microsoft abstracted a standard library, and both .NET Core and .NET Framework must implement the API of this standard library. In this way, .NET Core, .NET Framework and XAMARIN become three brothers, serving different platforms respectively.

Now the preview version of .NET Core 2.0 has been released, and .NET Core 2.0 is basically equivalent to .NET Framework 4.6.1. It took only one year to release version 1.0 in June 2016 to release version 2.0 in June 2017. Microsoft's efforts can be seen.

3. What preparations do you need to make to learn .NET Core? Basic programming experience (.NET, Java, Python, etc. are all possible) Windows / Mac as a development environment (it is recommended to use Windows, because the development environment is Windows, and the operation will be different in different environments) IDE: Visual Studio 2017 / Visual Studio Code Linux basic use (recommended CentOS and Ubuntu) Virtual machine installation tutorial: http://ipnx.cn/link/8fc00922bc09442f10ff8a8be0973604 Quickly get started with CentOS: http://ipnx.cn/link/cd3b6e78242b4c8faa986194ba2bfc58 Quick get started with Ubuntu: http://ipnx.cn/link/32926f6c2eba28e293a6afa008a09f0a If you really don't have the conditions to build a Linux environment, Windows can do it, but it is not recommended.

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