Question about entityframework instances (this post is used to count usage habits and causes)

First, ask the Administrator to allow me to count the solution in a few places on the homepage. I have asked this question in the group, and I have to ask for more comments and ideas, at the same time, let's solve a question for everyone.

When using entityframework in combination with web, I found the following problems:

1): If the repository mode is used, generally, each specific repository has a context (objectcontext, or dbcontext) attribute to perform specific data access operations.

2): a page (or a controller/Action), that is, a request, usually faces multiple Repository

3) the cache is not shared among multiple context instances.

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My problem is:

In the process of using it, is it an httprequest context instance, or is it used to create a new instance every time.

If your policy is: An httprequest corresponds to a context instance, please reply to

If you adopt the following policy: reply to B every time you create a new context instance.

If you adopt other policies, please reply to C.

If you can, please attach your reason (very important)

Thank you.