If you omit this setting, ADO. If the full path is longer than characters, a default database name is constructed from the path by appending a hash of the full path to the file name. In LocalDB connection strings, the Visual Studio web project templates add a unique number as a suffix to both the file name and the Initial Catalog setting, as shown in the following example:. Suppose the project specified the following values:.
When you create a project with these settings and run it, LocalDB attaches the aspnet. The operation fails because that name is already attached to the first project's aspnet. For the same reason, the suffixes added by the Visual Studio templates won't prevent name collisions if you create a copy of a project by copying the files instead of by creating a new project in Visual Studio, which generates a new unique number.
If you want to create a new project by copying an existing project's files, change the suffix number manually to make it unique. With this connection string, what happens to the database name in the SQL Server instance is complicated. If the database is created by the ASP. NET membership system or by Entity Framework Code First, a database name is created by taking the file name without the. If your own code creates the database, or if you detach the database and run the project again after the.
If that name would be longer than characters, the database name would be the file name with a hash of the full path appended to it. Some examples of these database names are shown in the following illustration:. This setting specifies whether the connection should use the user ID and password in the connection string to log on to the SQL Server instance, or the current Windows account credentials should be used for authentication:.
False means use SQL Server security to log in by using the User ID and Password values in the connection string, and raise an exception if they are not present. This is a common scenario when you use the Entity Framework, especially if you leave lazy loading enabled. For example, the second line of code in the following example will raise an exception if you don't enable MARS because the query that returns instructors is still active when the ToList method executes a new query that retrieves related courses:.
It is often more efficient to load related data by using eager loading, which retrieves all of the data by using a single join query, but sometimes join queries are inefficient. In most real-world applications, there are times when the best choice for loading related data is lazy loading or explicit loading. Therefore, connection strings for databases that you access by using the Entity Framework typically specify this option.
This option carries a slight performance penalty, but in most scenarios its benefits outweigh any performance loss even if you aren't using the Entity Framework. You use the AttachDbFileName setting to connect to a database in an. In order to connect to this database file, the SQL Server Express instance on your computer has to attach the file. Also, even if you are an administrator and are able to attach the.
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By default, all methods in a hub can be called by an unauthenticated user. To require authentication, apply the Authorize attribute to the hub:. You can use the constructor arguments and properties of the [Authorize] attribute to restrict access to only users matching specific authorization policies.
For example, if you have a custom authorization policy called MyAuthorizationPolicy you can ensure that only users matching that policy can access the hub using the following code:. Individual hub methods can have the [Authorize] attribute applied as well.
If the current user doesn't match the policy applied to the method, an error is returned to the caller:. SignalR provides a custom resource to authorization handlers when a hub method requires authorization. The resource is an instance of HubInvocationContext. The HubInvocationContext includes the HubCallerContext , the name of the hub method being invoked, and the arguments to the hub method.
Consider the example of a chat room allowing multiple organization sign-in via Azure Active Directory. Anyone with a Microsoft account can sign in to chat, but only members of the owning organization should be able to ban users or view users' chat histories. Furthermore, we might want to restrict certain functionality from certain users. Using the updated features in ASP. NET Core 3. Now that the HubInvocationContext resource parameter is being passed in, the internal logic can inspect the context in which the Hub is being called and make decisions on allowing the user to execute individual Hub methods.
In Startup. ConfigureServices , add the new policy, providing the custom DomainRestrictedRequirement requirement as a parameter to create the DomainRestricted policy. In the preceding example, the DomainRestrictedRequirement class is both an IAuthorizationRequirement and its own AuthorizationHandler for that requirement.
It's acceptable to split these two components into separate classes to separate concerns. A benefit of the example's approach is there's no need to inject the AuthorizationHandler during startup, as the requirement and the handler are the same thing. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Authentication and authorization in ASP. Is this page helpful? Please rate your experience Yes No.
Any additional feedback? UseStaticFiles ; app. UseRouting ; app. UseAuthentication ; app. UseAuthorization ; app.
Note If a token expires during the lifetime of a connection, the connection continues to work. Note If a token expires during the lifetime of a connection, by default the connection continues to work.
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