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Why is my session state not being used properly in asp.Net core?Powered by mailbee.Net objects - send, receive, process email and sorts of outlook files in .Net icons. Now thanks to the office 365 oauth 2.0 tips.

Why is my session state not working in asp.Net core? Session state, gdpr and optional cookies

- Facebook---in this post, i describe a question where i have encountered more than once asked about the state of affairs of the session. The script looks something like this:

- Create a future asp.Net application core- set a session power string to use, eg. Httpcontext.Session.Setstring("theme", "dark");- on the next request, try to load the value from the session with httpcontext.Session.Getstring("theme"); but return zero!"Gah, this stupid structure is not used properly" 2.1, and the fact that the session state uses cookies.In this case, the post i describe in connection with which you can see such a relation, and in addition a number of methods for eliminating it.

Gdpr functions were made in asp.Net core 2.1, hence the conclusion: if you are using 2.0 or 1.X, a person will not understand such annoyances, remember that 1.X will end support on june 27, 2019, and 2.0 is no longer supported, so it's worth considering about updating your applications to version 2.1 if that's realistic.

Session state in asp.Net core

As i said above, if you open asp . Net core 2.0 or earlier version will not be able to see such shortcomings.I will demonstrate the old "expected" behavior using asp.Net core 2.0 to show how representatives of humanity, with jostled by need usually expect the session state to behave. Then i'll create an equivalent application in asp.Net core 2.1 and show that session state no longer looks like s for service purposes.

What is session state?

Session state is a feature that [falls back to asp.Net (minor)](https ://docs.Microsoft.Com/en-us/previous-versions/ms178581(v=vs.140) where you have the ability to push and retrieve values on the server side for the client viewing the resource.Session state was commonly used quite widely in asp.Net icons, but was problematic for a variety of reasons, mainly due to performance and scalability.

Session state in asp.Net core is somewhat reduced.You need to take care of this in detail - as a cache for all customers.From a technical point of view, session state in asp.Net core requires two separate parts:

File cookie - required to assign a unique identifier (session identifier) to the user.Distributed cache - used to better guarding elements provoked by a given session id.If possible, i would avoid using session state if you can avoid using it. There are a lot of warnings in it that can easily bite you if you haven't tried them. For example:

– Sessions are issued for any browser, but not for the user logged into the electronic account– session cookies (and of course, sessions) are supposed to be deleted at the end of the browser session, but in the state not .– If there are no values left in the session, the order will be deleted with the enhancement of the new session id– the gdpr issue described in the performance post!This is about session state. Are available and how the scheme works. In the next page i'll create a little application that stops which site you have hosted, keeping the registry in session power, and then displaying the provided segment on the main page.

Using session state in an asp.Net plugin core 2.0

To demonstrate the change in behavior regarding upgrading from 2.0 to 2.1, i'll start by developing an asp.Net core 2.0 application. Since i probably still have a lot of .Net core sdk packages installed on my machine, i'm going to use sdk version 2.0 (version number 2.1.202) to organize the version 2.0 project template.

Start by creating a global.Json file to pin the sdk version in the application sections:

Then template a new asp.Net core 2.0 mvc application using dotnet new:

session state in silent mode is not configured, so you need to add the necessary services. Update configureservices in startup.Cs to include session services. Default asp.Net core will use a live session store appropriate for the intended testing needs, but it needs to be updated for production:

By the way, you should add session middleware to any pipeline. Only middleware added after session middleware will be accessed in session state, so most often you add it just before mvc middleware in startup.Configure:

For this simple ( of the toy) example i want to reach and mount the session string value on the first page view using session key "actions". In case you see different pages, the session value will expand here with action names separated by semicolons. Update your homecontroller to enable the recordinsession feature as shown below:

Note. Session.Getstring(key) is a way to expand in the microsoft.Aspnetcore.Http universe of names

Finally, we will display the current value of the "manipulation" key on the index.Chstml main tab: 

If you run the application and view it more than once, it means that a list of session actions is being created. In the example below, i visited the home page three times, the about page twice, and the contact page once:

If you see the cookies associated with the blog, you can see the .Aspnetcore file. A session cookie that includes an encrypted session id. If you clear this cookie, you will know that the "action" value is reset and the list is lost. Constitutes a difficulty. Difficulties arise when you try to do everything with asp.Net core 2.Par.2 application.

Asp.Net core 2.Par.2 session state problems

to create an asp.Net core 2.2 application, i used almost the same behavior, however, i didn't pin the sdk at this point. I have asp.Net core 2.2 sdk (2.2.102) installed, so the following creates an asp.Net core 2.2 mvc application:

You still need to explicitly set session state, so update startup by -to the old way, by adding services.Addsession() to configureservices and app.Usesession() to configure.

The templates of the latest version 2.2 were simplified before competitors by previous versions, so for consistency i copied all homecontroller from by 2.0. I also copied the index.Chtml, about.Chtml and contact.Cshtml view files. Finally, i've updated layout.Cshtml to include the about page address and conversations in the header.

These two apps, while serving different asp.Net core flavors, are pretty much the same. However, this time when you click on the app, the main tab shows only one visit to the directory every day, and not much of a visit to other pages is logged either:

Don't click the privacy policy banner - very fast you'll be able to find out why!

Also, as you check your cookies, you'll find that there aren't any! The .Aspnetcore.Session cookie is conspicuously missing:

Apparently everything is set up correctly and the session itself works (because the value set by the excellent homecontroller.Index may have been successfully retrieved into index.Cshtml). But it looks like session state doesn't persist between group reloads and navigators.

So why would this happen in asp.Net core 2.One-two.2, where did it work in asp. Net core 2.0?

Why is the process running? Gdpr

The answer goes hand in hand with many of the new features added in asp.Net core 2.1. To help developers meet the gdpr expectations that have come into play this year, asp.Net core 2.1 introduced some additional extension points, as well as template updates. Document, according to these changes is excellent, given the above, i'll just summarize the relevant changes here:

Cookie consent dialog box. By default, asp.Net core does not write "optional" cookies to the response until the visitor clicks the consent dialogcookies are either marked as required or non-essential. Required cookies start bookmarking regardless of whether consent is given, optional cookies require consent.Session cookies are considered optional, so sessions cannot be tracked when navigating or reloading the page until the man has given his consent. .Temporary contacts are not needed. The tempdata provider stores values in cookies in asp.Net core 2.0 , so tempdata won't remain functional until the person has given their own consent.So the bottom line is any of us need the client's consent to maintain cookies.When you click "take on the privacy banner, then asp.Net core will be able to write the display cookie and the expected functionality will be restored:

So if a person needs to use session state in your application 2.Percent- two or three.2 what would a woman need to do?

Working with session state in asp.Net core 2.1 icons

Depending on the application you are using building, you personally have a number of suggestions. Which one is preferable to which depends on the prevailing use case, but it's worth considering that such features were added for one reason or another - to allow developers to comply with gdpr.

If you are not diving into the eu , and because you suspect that “gdpr doesn’t apply to me”, be sure to check out this great post from troy hunt - probably gdpr is still applicable in the house!

The main positions that i see are this is :

1. Agree with the statement that session state is not available until visitors allow consent.2. Disable features that require session state until consent is threatened.3. Disable the cookie consent requirement.4. Mark the session cookie as required.I'll go into detail about any setting below, but remember that the optimal choice has an impact on gdpr matching!

1. Accept existing behavior

The easiest option is to simply accept the existing behavior. Session state in asp.Net core should normally only be used as ephemeral data, so your application should be able to handle the case where session state is not available.

Depending on why you are a reliable partner use, it either won't be possible, and it's the most optimal way to handle some patterns and the least risky in the context of your exposure. Gdpr questions.

2. Disable advanced features

The second option is very similar to the first in that the viewer retains the existing behavior. The difference is that option 1 treats the session state easily as a cache, so you have no doubt that session values can come and go. Option 2 takes a slightly different approach: it segments the areas of the application that might need show state and makes insects explicitly inaccessible until consent should be given.

For example, you might need to make session state . To coordinate "the choice of themes, where information about the conditions is stored, whether the user prefers a "light" or "dark" theme. If no consent is given, you are really hiding the "subject chooser" until the holder allows consent.

This seems to be an improvement over option 1, in the first place due to improved contact with the buyer. When a person does not consider features that require session state, it is able to confuse the user. For example, if everyone has implemented option 1 and always shows "theme choice", the person is able to continue choosing a dark theme, however they will not remember their choice yet. Sounds disappointing!

There is only one big caveat to this approach. Remember that session state can disappear at any time. The bodybuilder should treat it like a cache, so the buyer should not create features that assume: but it will continuously be there (even if the user agreed) or used you will get one visit for any cool user (different browsers). Will have different session ids for the same logical user).

3. Disable cookie consent requirement

If you are sure that the consumer does not need the cookie consent feature, you can simply disable this thought in personal applications. The default template even calls this explicitly in startup.Configureservices, here you configure cookiepolicyoptions:

The checkconsentneeded property is a predicate that is called by the framework to analyze whether optional cookies need to be set. To the answer. If the function returns true (as above, the default value in the template), then optional cookies are skipped. Change this to false and the quality of the session benefits from interacting without explicitly accepting cookies.

4. Mark session cookies as important

Disabling cookie consent completely can be a little difficult for specific applications. If this is you, but you want session state to be recorded even before the user accepts the cookie, you have the option to mark the session cookie as required.

Again, state session was considered invalid. Interested for a good reason.Make sure you can substantiate your choices in subtle ways, and probably go for guidance before introducing refinements like this or option 3.

There is an overload of services.Addsession() that allows you to set up sessionoptions in native startup file. . You have the ability to change various settings, which list the session timeouts, but also set the session cookie. To mark a cookie as required, set the isessential parameter to true:

If you want to dress well, the cookie consent banner will still be displayed, and non-essential cookies will not be set until, until the ailment will not be able to be pressed. But the session state will be able to exist immediately before consent is given, as it is considered necessary:

In this post, i described a problem that i have been asked about more than once, when developers find that their session pin up aviator state is not saved correctly. This is most often done through the gdpr functions laid out in asp.Net core 2.Number one for cookie consent and optional cookies.

I have shown an example of a problem in access and how nor is it different between appendix 2.0 and insert 2.2. I described how the session state depends on the session cookie, which by default is considered optional and is not recorded in the rebuttal until the player has consented.

Finally, i described four ways to deal with this behavior: agree, try nothing and find it; disable session level dependent features as long as no consent is given; remove the consent requirement; and set the session cookie to the main cookie. Which way viewers prefer to stay depends on what you create, and beyond that your exposure to gdpr and similar legislation.

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