Question regarding Generics

Tridip Bhattacharjee

what is the meaning of IdentityDbContext

public class ApplicationDbContext : IdentityDbContext
{
public ApplicationDbContext(): base("DefaultConnection")
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity().ToTable("MyUsers");
}
}

i am bit weak in generics. please tell me the meaning of this line public class ApplicationDbContext : IdentityDbContext

what the above line is doing?

thanks

5 Replies

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Srikant Maruwada8y ago
Accepted answer
Hi Tridip,

This is not generic. This is called constraints on Type Parameters. Find example

https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/generics/constraints-on-type-parameters

e.g

class EmployeeList where T : Employee, IEmployee, System.IComparable, new() { // ... }

Here in the above syntax constraint is applied i.e. EmployeeList would hold the type of Employee or IEmployee.

Similarly in IdentityDbContext which should pass the data of ApplicationUser.
Tridip Bhattacharjee8y ago
my question was not about IdentityDbContext and ApplicationUser class rather my question about generic

suppose i have class called class EmployeeList
what does it mean? in what kind of situation people write code in the above way.

please come with a small and nice example which explain the signification of this kind of code SomeClass

thanks
Karthik Elumalai8y ago
Tridip:

here i asked about generic
what is the meaning of this syntax or code
public class App : yourclass
tell me the meaning.

Answer:

In simple words , its means that the logic written for can be apply to

In general , using generic we achieve the logic reusablitiy , the logic written for one entity can be reused for another entity . Ex: addition logic of a different entities like student,staff..etc.

Hope that will give some simple direction to understand ,and you can start dig more

Here is the one good reference:http://www.c-sharpcorner.com/UploadFile/84c85b/using-generics-with-C-Sharp/

thanks
Karthik
Tridip Bhattacharjee8y ago
here i asked about generic

what is the meaning of this syntax or code

public class App : yourclass

tell me the meaning.
Ramesh Palanivel8y ago
Hi Tripid,

IdentityDbContext will let you use your own ApplicationUser class as the User entity. I.e. you can have custom properties on your users. The IdentityDbContext class inherits from IdentityDbContext which means you will have to use the IdentityUser class for your users.

If you want to have more properties on your user objects than the few properties that IdentityUser provide (UserName, PasswordHash and a few more) then you may want to choose IdentityDbContext

Answer took from : https://stackoverflow.com/questions/20281074/what-is-the-difference-between-identitydbcontext-and-identitydbcontextapplicati