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This article mainly explains the "ASP.NET page life cycle is what", the article explains the content is simple and clear, easy to learn and understand, the following please follow the editor's ideas slowly in-depth, together to study and learn "ASP.NET page life cycle is what" it!

When the ASP.NET page runs, the page goes through a life cycle in which a series of processing steps are performed. These steps include initialization, instantiating controls, restoring and maintaining state, running event handler code, and rendering. It is important to understand the life cycle of the page so that you can write code at the appropriate life cycle stage to achieve the desired results. In addition, if you develop custom controls, you must be familiar with the page life cycle to properly initialize the control, populate control properties with view-state data, and run all control behavior logic.

The page life cycle of the ASP.NET programming model performs a series of steps: initializing the page, instantiating controls, restoring and maintaining state, running event handler code, and rendering. In order to execute the required code at the appropriate stage, you should be very familiar with the page life cycle. At all stages of the page life cycle, the page raises defined events one by one, and through code development, we execute the programs we need in the life events of the page.

Page life cycle phase

1, ASP.NET page life cycle page request: occurs before the page life cycle, when the user requests the page, ASP.NET will determine whether the page needs to be analyzed and compiled to determine whether to start the page life cycle, or whether the page cache can be sent in response without running the page.

2. The beginning of the life cycle of the ASP.NET page: set the page properties, such as HttpContext and other properties; at this stage, the page needs to determine whether to post back the request or a new request, and set the IsPostBack property; set the UICulture property of the page.

3. Page initialization of ASP.NET page life cycle: load all themes, generate controls, and set UniqueID

Note: the values in ViewState and ControlState have not been loaded into the control; if the page is a postback, the postback data has not been loaded; therefore, the control can be accessed at this time, but the value may be incorrect.

4. ASP.NET page lifecycle loading: if the current request is a postback request, load the values in ViewState and ControlState for the control.

5. ASP.NET page lifecycle validation: call the Validate method of all validator controls, which sets the IsValid property of the validator control and the page.

6. Postback event handling for the life cycle of ASP.NET pages: if the request is a postback request, all event handlers are called.

7. Rendering of the ASP.NET page life cycle: first save the view state to the page and all controls, and then call the Render method on each control, which provides a text writer for writing the control's input into the OutputStream of the page's Response property.

8. Unload the ASP.NET page life cycle: call unload after the rendering is complete, the page has been sent to the client, and the page is ready to be discarded. Properties such as Response and Request will be unloaded.

The following is a diagram of the life cycle of ASP.NET pages in the ASP.NET programming model

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