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Create.cshtml.cs
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Create.cshtml.cs
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using System;
using System.ComponentModel.DataAnnotations;
using System.Threading;
using System.Threading.Tasks;
using ContosoUniversity.Data;
using ContosoUniversity.Models;
using FluentValidation;
using MediatR;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
namespace ContosoUniversity.Pages.Students
{
public class Create : PageModel
{
private readonly IMediator _mediator;
public Create(IMediator mediator) => _mediator = mediator;
[BindProperty]
public Command Data { get; set; }
public void OnGet() => Data = new Command();
public async Task<IActionResult> OnPostAsync()
{
await _mediator.Send(Data);
return this.RedirectToPageJson(nameof(Index));
}
public record Command : IRequest<int>
{
public string LastName { get; init; }
[Display(Name = "First Name")]
public string FirstMidName { get; init; }
public DateTime? EnrollmentDate { get; init; }
}
public class Validator : AbstractValidator<Command>
{
public Validator()
{
RuleFor(m => m.LastName).NotNull().Length(1, 50);
RuleFor(m => m.FirstMidName).NotNull().Length(1, 50);
RuleFor(m => m.EnrollmentDate).NotNull();
}
}
public class Handler : IRequestHandler<Command, int>
{
private readonly SchoolContext _db;
public Handler(SchoolContext db) => _db = db;
public async Task<int> Handle(Command message, CancellationToken token)
{
var student = new Student
{
FirstMidName = message.FirstMidName,
LastName = message.LastName,
EnrollmentDate = message.EnrollmentDate!.Value
};
await _db.Students.AddAsync(student, token);
await _db.SaveChangesAsync(token);
return student.Id;
}
}
}
}