Delete Data From Complextype Using Code First Approach

Vijay Prativadi
9y
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Article

Introduction

This article shows how to access a SQL Server database with Entity Framework code first approach and later we will also look at how to do a delete data operation using a complex type.

Create ASP.Net web application

Employee.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace ComplexType_CFA_DeleteApp
{
public class Employee
{
public Employee()
{
}
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public EmployeeDetails EmployeeDetails { get; set; }
}
}

EmployeeDetails.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Web;
namespace ComplexType_CFA_DeleteApp
{
[ComplexType]
public class EmployeeDetails
{
public EmployeeDetails()
{
}
public int Phone { get; set; }
public int Age { get; set; }
public string Email { get; set; }
}
}

Employeecontext.cs

using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Web;
namespace ComplexType_CFA_DeleteApp
{
public class EmployeeContext: DbContext
{
public EmployeeContext()
: base("EmployeeConn")
{
Database.SetInitializer<EmployeeContext>(new CreateDatabaseIfNotExists<EmployeeContext>());
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
//Set primary key to Employee table
modelBuilder.Entity<Employee>().HasKey(m => m.Id).Property(m => m.Id).IsRequired();
//First Name is required and Max Length is 50
modelBuilder.Entity<Employee>().Property(p => p.FirstName).IsRequired().HasMaxLength(50);
//Last Name is required and Max Length is 50
modelBuilder.Entity<Employee>().Property(p => p.LastName).IsRequired().HasMaxLength(50);
//Age is required
modelBuilder.ComplexType<EmployeeDetails>().Property(p => p.Age).IsRequired();
//Phone is required
modelBuilder.ComplexType<EmployeeDetails>().Property(p => p.Phone).IsRequired();
//Email is required
modelBuilder.ComplexType<EmployeeDetails>().Property(p => p.Email).IsRequired();
}
public DbSet<Employee> Employees { get; set; }
}
}

Web.config

<connectionStrings>
<add name="EmployeeConn"
connectionString="Data Source=WIN-B4KJ8JI75VF;Initial Catalog=EmployeeDB;Integrated Security=true"
providerName="System.Data.SqlClient"/>
</connectionStrings>

Webform1.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="ComplexType_CFA_DeleteApp.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>Email:
</td>
<td>
<asp:TextBox ID="txtEmail" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="btnSave" runat="server" Text="Save" OnClick="btnSave_Click" />
</td>
</tr>
</table>
</div>
</form>
</body>
</html>

Webform1.aspx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace ComplexType_CFA_DeleteApp
{
public partial class WebForm1 : System.Web.UI.Page
{
EmployeeContext entities = new EmployeeContext();
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnSave_Click(object sender, EventArgs e)
{
var query = (from r in entities.Employees where r.EmployeeDetails.Email == txtEmail.Text select r).Single();
entities.Employees.Remove(query);
entities.SaveChanges();
}
}
}

Output

The output of the application looks like this:

Summary

In this article we saw how to access a SQL Server database with Entity Framework code first approach and how to do a delete data operation using a complex type. Happy coding.

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