[Solved] Writing a method which select all the rows and columns of the table given using Entity Framework

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Can you write this method on the DbContext class?

Then you could write something like in a separate new class file (e.g. ActionContextExtensions.cs or something like that):

public partial class ActionContext : DbContext
{
    public IEnumerable<T> SelectAll<T>() where T: class
    {
        return this.Set<T>().AsEnumerable();
    }
}

This returns the type as defined by the generic parameter – so you can say something like:

var result = db.SelectAll<Employee>()

or 

var result = db.SelectAll<Customer>()

or

var result = db.SelectAll<Book>()

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solved Writing a method which select all the rows and columns of the table given using Entity Framework