Question regarding Generics

Question

what is the meaning of IdentityDbContext<ApplicationUser>

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

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

what the above line is doing?

thanks

Srikant Maruwada · 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.

Ramesh Palanivel · Answer

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

Tridip Bhattacharjee · Answer

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 Elumalai · Answer

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 Bhattacharjee · Answer

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

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