msiddiqi

Test Gist

msiddiqi

var test = new Student();
//add it to context
context.Students.Add(student);

msiddiqi

protected virtual ValidationResult IsValid(Object value, ValidationContext validationContext)

msiddiqi

public InstituteEntities()
{
    this.Configuration.ValidateOnSaveEnabled = true;
}

msiddiqi

namespace EFCodeFirstValidation.Helpers
{
    using System.Linq;
    using System.Text;
    using System.Data.Entity.Validation;
    using System.Collections.Generic;

    class DbEntityValidationMessageParser
    {
        internal static string GetErrorMessage(DbEntityValidationException validationException)

msiddiqi

using (var context = new InstituteEntities())
{
    var student = context.Students.Create();
    student.StudentFirstName = "Muhammad";
    student.StudentLastName = "Siddiqi";
    context.Students.Add(student);

    try
    {
        //save changes

msiddiqi

namespace EFCodeFirstValidation.Entities.Validation.AssociateMetadata
{
    class StudentAssociatedMetadata
    {
        [MinLength(3)]
        public virtual string StudentFirstName { get; set; }

        [Required]
        public virtual string StudentLastName { get; set; }

msiddiqi

namespace EFCodeFirstValidation.Entities.Validation.AssociateMetadata
{
    using System.Text;
    using System.ComponentModel.DataAnnotations;

    class DepartmentAssociatedMetadata
    {
        [RegularExpression("^Department of")]
        public virtual string DepartmentName { get; set; }
    }

msiddiqi

namespace EFCodeFirstValidation.Entities
{
    using System.ComponentModel.DataAnnotations;
    using EFCodeFirstValidation.Entities.Validation.AssociateMetadata;

    [MetadataType(typeof(DepartmentAssociatedMetadata))]
    public partial class Department
    {
    }
}

msiddiqi

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);

    modelBuilder.Entity<Department>()
                .Property(d => d.DepartmentName)
                .HasMaxLength(20);

    modelBuilder.Configurations.Add(new StudentConfiguration());
}