Asp.net captures the output html

After learning about the lifecycle of the Asp.net page, you may have the idea that the server can intercept the HTML to be output when HTML is output, I found a lot of information on the Internet and did not find the answer. I finally learned how to do it with the help of an expert. I 'd like to share it with you.

As we all know, in the lifecycle of a page, the last stage is rendering and executing the render event.

You can rewrite this method.

Protected override void render (htmltextwriter writer)
{
// Base. Render (writer );

System. Io. memorystream mem = new system. Io. memorystream ();
System. Io. streamwriter twr = new system. Io. streamwriter (MEM );
System. Web. UI. htmltextwriter mywriter = new htmltextwriter (twr );
Base. Render (mywriter );

mywriter. Flush ();
mywriter. Dispose ();

System. Io. streamreader strmrdr = new system. Io. streamreader (MEM );
Strmrdr. basestream. Position = 0;
String pagecontent = strmrdr. readtoend (); // obtain the HTML to be output
Strmrdr. Dispose ();
Mem. Dispose ();
// Set the breakpoint here to view the value of pagecontent
// Session ["htmlcode"] = pagecontent;
Writer. Write (pagecontent); write to the output stream

}