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ASP.NET 4 will focus on the simplicity of development, making it more suitable for rapid development and various scenarios. At the same time, some new features of HTML 5 will greatly improve the performance.

At the PDC 2009 conference last month, Jonathan Carter and Scott Hunter of the Microsoft ASP.NET team demonstrated some of the features designed for later versions of ASP.NET 4, mainly in the direction of simplifying application development, supporting Web standards, and improving performance.

In terms of simplifying application development, the ASP.NET team is considering the following features:

Action Record mode support for ASP.NET MVC and WebForms, based on Entity Framework, facilitates rapid modeling and rapid development.

Easier to use Route rules: can be combined with a variety of information (such as the file path on the hard disk) to automatically determine the routing target and related parameters.

Extensible, auxiliary methods based on common tasks / scenarios, such as:

Image processing, such as zooming, watermarking and other common operations.

OpenID support so that developers can easily integrate ASP.NET authentication with OpenID.

Schedule a task in the background, such as performing a task "every 10 minutes" or "every day at 2 a.m.".

Email delivery, and the registration process that uses Email for verification.

Real file upload progress tips, which currently require some dangerous tricks, and ASP.NET may release more interfaces to support it in the future.

HTML 5 brings many new features, such as new HTML tags, native video and audio support, and drag-and-drop operations. Future ASP.NET will first support more semantic markup in HTML 5. For example, in ASP.NET 2.0, controls generate complex table tags, in ASP.NET 4, they become ul/il nesting that conforms to current semantics, and in future ASP.NET, tags may be generated. In addition, HTML 5's Web Storage feature allows data to be stored in browsers, and an optional IntermediateDataContext will be available in future Microsoft AJAX libraries to replace the current AdoNetDataContext, which stores data on the server side through the WCF interface, while the former saves data locally.

In terms of performance improvement, the ASP.NET team will provide a variety of provider for ASP.NET after the release of Microsoft's distributed cache Velocity. In this way, ASP.NET can store all kinds of information such as data cache and session state in the distributed cache outside the process, so as to get better performance and robustness. These provider implementations integrate well with ASP.NET 's existing extensions and remain transparent to developers.

As the display effect of Web applications becomes more and more rich, the importance of front-end performance optimization of web pages is also improved. Future ASP.NET will have built-in compression and merging of CSS or JavaScript files, and support for complex optimization methods such as CSS Sprites. The optimization principle of CSS Sprite is to merge a large number of small pictures on the page into a file, and then use the CSS positioning mechanism to display some of them, which has the advantage of greatly reducing the number of times of communication between the browser and the server, and often can significantly improve the page loading speed. ASP.NET can automatically merge a group of images according to the needs of developers in the future, and expose the information (such as location, size) of a single image through some interfaces, and even directly generate HTML tags containing specific attributes on the page.

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