microsofttotorial中的http405錯誤-asp.netmvc

“創建”部分讓我頭疼

學生控制器.cs

using ContosoUniversity.Data;
using ContosoUniversity.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace ContosoUniversity.Controllers
{
    public class StudentsController : Controller
    {
        private readonly SchoolContext _context;

        public StudentsController(SchoolContext context)
        {
            _context = context;
        }
        public async Task<IActionResult> Index()
        {
            return View(await _context.Students.ToListAsync());
        }

        public async Task<IActionResult> Details(int? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            var student = await _context.Students
                .Include(s => s.Enrollments)
                    .ThenInclude(e => e.Course)
                .AsNoTracking()
                .FirstOrDefaultAsync(m => m.ID == id);

            if (student == null)
            {
                return NotFound();
            }

            return View(student);
        }


        [HttpPost]
        [ValidateAntiForgeryToken]
        public async Task<IActionResult> Create([Bind("EnrollmentDate,FirstMidName,LastName")] Student student)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    _context.Add(student);
                    await _context.SaveChangesAsync();
                    return RedirectToAction(nameof(Index));
                }
            }
            catch (DbUpdateException /* ex */)
            {
                //Log the error (uncomment ex variable name and write a log.
                ModelState.AddModelError("", "Unable to save changes. "  
                    "Try again, and if the problem persists "  
                    "see your system administrator.");
            }
            return View(student);
        }


 


    }
}

創建.cshtml

@model ContosoUniversity.Models.Student

@{
    ViewData["Title"] = "Create";
}

<h1>CreateView</h1>

<h4>Student</h4>
<hr />
<div class="row">
    <div class="col-md-4">
        <form asp-action="Create">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="LastName" class="control-label"></label>
                <input asp-for="LastName" class="form-control" />
                <span asp-validation-for="LastName" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="FirstMidName" class="control-label"></label>
                <input asp-for="FirstMidName" class="form-control" />
                <span asp-validation-for="FirstMidName" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="EnrollmentDate" class="control-label"></label>
                <input asp-for="EnrollmentDate" class="form-control" />
                <span asp-validation-for="EnrollmentDate" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>
    </div>
</div>

<div>
    <a asp-action="Index">Back to List</a>
</div>

@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

如果我洗掉“[HttpPost]”，我的模型會立即更新并使用空資料提交并回傳到索引頁面

實際教程的鏈接：

https://docs.microsoft.com/en-us/aspnet/core/data/ef-mvc/crud?view=aspnetcore-5.0#update-the-create-page

謝謝

uj5u.com熱心網友回復：

您只需要添加method="post"到<form></form>.

<form asp-action="Create" method="post">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="LastName" class="control-label"></label>
                <input asp-for="LastName" class="form-control" />
                <span asp-validation-for="LastName" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="FirstMidName" class="control-label"></label>
                <input asp-for="FirstMidName" class="form-control" />
                <span asp-validation-for="FirstMidName" class="text-danger"></span>
            </div>
            <div class="form-group">
                <label asp-for="EnrollmentDate" class="control-label"></label>
                <input asp-for="EnrollmentDate" class="form-control" />
                <span asp-validation-for="EnrollmentDate" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Create" class="btn btn-primary" />
            </div>
        </form>

這樣表單將包含一個隱藏的輸入，名稱為__RequestVerificationToken，其中包含 AntiForgeryToken 的值。當表單提交時，令牌將傳遞給 Create 操作。

uj5u.com熱心網友回復：

由于該操作具有 [ValidateAntiForgeryToken] 屬性，因此您應該將其添加到視圖中，并將表單標記替換為 html 幫助器

@using (Html.BeginForm("Create", "Students", FormMethod.Post)) 
{
    @Html.AntiForgeryToken()
   <div asp-validation-summary="ModelOnly" class="text-danger"></div>
 .... and so on

}

恕我直言，不要在您的發布操作中使用任何系結，這絕不是一個好主意

[HttpPost("~/students/create")]
[ValidateAntiForgeryToken]
public async Task<ActionResult> Create(Student student)

uj5u.com熱心網友回復：

找到了解決方案...我需要另一種用于 HttpGet 的方法，具有相同的名稱（創建）...仍然不確定為什么，它現在可以作業，沒有 405 錯誤

如果有人有很好的解釋，請

這是我在控制器中添加的：

public IActionResult Create()
        {
            return View();
        }

標籤：实体框架 asp.net-core-mvc

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