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How to modify CRUD operations with Entity Framework in .NET MVC application


How to modify CRUD operations with Entity Framework in .NET MVC application

By : user2956967
Date : November 22 2020, 03:03 PM
seems to work fine I guess you are using database first approach.
some useful links for Code first approach: http://www.codeproject.com/Tips/793159/Code-First-Approach-in-Entity-Framework-using-Data
code :


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Best practices to perform CRUD operations on Entities (Entity Framework)

Best practices to perform CRUD operations on Entities (Entity Framework)


By : Leonela Fulgencio
Date : March 29 2020, 07:55 AM
this one helps. In most cases, business objects and data access should be separated. Have a look at the Repository Pattern here, and here. This is probably exactly what you need.
How to write Linq Queries for CRUD operations using Entity Framework with Asp.Net?

How to write Linq Queries for CRUD operations using Entity Framework with Asp.Net?


By : user5582445
Date : March 29 2020, 07:55 AM
I wish this help you Add, Update and Delete Objects in Entity Framework 4.0
// Insert
code :
public void AddStudent(People s)
{
    _db.People.Add(s);
    _db.SaveChanges();
}
public void DeleteStudent(People s)
{
    _db.People.Remove(s);
    _db.SaveChanges();
}
public void EditStudent(People s)
{
    var people = _db.People.First( p=> p.ID == s.ID); // Replace ID with primary key

  // Copy all properties from s to people

    _db.SaveChanges();
}
Entity Framework Code First customize CRUD Operations

Entity Framework Code First customize CRUD Operations


By : syarifuddinAhmads
Date : March 29 2020, 07:55 AM
wish helps you 1
To set the primary key yourself, add the DatabaseGeneratedOption.None attribute:
code :
public class Child
{
   [Key, DatabaseGenerated(DatabaseGeneratedOption.None)]  //<<<<---
   public string ChildCounter { get; set; }
   ...
}
public class Child
{
   [Key, DatabaseGenerated(DatabaseGeneratedOption.None)]
   public string ChildCounter { get; set; }
   ...
   public bool Deleted {get; set;}  //<<<<---
}

[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(string id)
{
    var tblchild = db.tblChilds.Find(id);
    tblchild.Deleted = true;
    db.SaveChanges();
    return RedirectToAction("Index");
}
var childItems = db.tblChilds.Where(c => !c.Deleted).ToList();
Repository Pattern using Entity Framework, code first and CRUD operations

Repository Pattern using Entity Framework, code first and CRUD operations


By : Josef Kaplon
Date : March 29 2020, 07:55 AM
Does that help A repository should not try to extend a model context, instead it should use this context to perform certain actions. A Repository is defined as
code :
public interface ICustomerRepository
{
   public List<Employee> GetAllEmployees();
}

public class CustomerRepository : ICustomerRepository
{
   private _dbCrudApplicationContext db;

   public CustomerRepository(_dbCrudApplicationContext context)
   {
     db = context;
   }

   public List<Employee> GetAllEmployees()
   {
      return db.Employees.ToList();
   }
}
C# Entity Framework (Code first), Implementing CRUD Operations on Model

C# Entity Framework (Code first), Implementing CRUD Operations on Model


By : Berry Ratliff
Date : March 29 2020, 07:55 AM
Any of those help Here is a quick example of how you might setup a simple Code First implementation to get started.
First, define your User model. The Key attribute on an integer type automatically configures the identity property for you. Then, you may want an index on username if you plan to do frequent lookups by username (to get user details or to validate a password).
code :
public class User
{
    [Key] // Becomes identity by default
    public int Id { get; set; }
    [Index("IX_User_Username", IsUnique = true)]
    public string Username { get; set; }
    public string Password { get; set; }
}
public class AppDataContext : DbContext
{
    public AppDataContext() : base("name=DBConnection") { }
    public DbSet<User> Users { get; set; }
}
<connectionStrings>
    <add name="DBConnection"  providerName="System.Data.SqlClient"
        connectionString="Data Source=instancePath;Initial Catalog=dbName;Integrated Security=true;MultipleActiveResultSets=True" />
</connectionStrings>
public class UserRepo : IDisposable
{
    public Lazy<AppDataContext> _db = new Lazy<AppDataContext>(() => new AppDataContext());

    public IQueryable<User> Get() => _db.Value.Users.AsQueryable();
    public IList<User> GetAll() => _db.Value.Users.ToList();

    public void Dispose()
    {
        if (_db.IsValueCreated)
            _db.Value.Dispose();
    }
}
// Use the repo
using (var userRepo = new UserRepo())
{
    var allUsers = userRepo.GetAll();
    var user = userRepo.Get().FirstOrDefault(m => m.Username == "myUsername");
}
// Or just use the data context
using (var db = new AppDataContext())
{
    var allUsers = db.Users.ToList(); // Get all users
    var user = db.Users.FirstOrDefault(m => m.Username == "myUsername");
}
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