［.NET Core 4］测试验证功能（相较于core教程属于新增）

sqllite 的数据库迁移功能有限制

1）新增如下model，执行数据库迁移不能成功，参考此链接“http://stackoverflow.com/questions/35797628/ef7-generates-wrong-migrations-with-sqlite”

初步判断有限制，所以删除数据库，删除迁移文件，重建数据库“http://www.atove.com/Article/Details/87E62DFDDBF9EC0C5350E7ACD43BADDF”（这篇文章是非.net core环境下的，实验无法成功，以后有空再实验）

using System;
using System.ComponentModel.DataAnnotations; //手动高亮

namespace MvcMovie.Models
{
    public class People{
        public int ID { get; set; }

        // [Display(Name = "姓名")]
        public string Name { get; set; }

        // [Display(Name = "年龄")]
        public int Age { get; set; }
    }
}

2）数据库OK

3）新增控制器PeopleController.cs，新增View目录“People”和视图文件Index.cshtml　

public async Task<IActionResult> Index()
        {
            return View(await _context.People.ToListAsync());
        }

@model IEnumerable<MvcMovie.Models.People>

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

<h2>ViewData["Title"]</h2>
<p>
    <a asp-action="Create">Create New</a>
</p>

<table class="table">
    <thead>
        <tr>
            <th>
                <!--Html.DisplayNameFor(model => model.Genre)-->
                @Html.DisplayNameFor( model => model.Name )
            </th>
            <th>
                @Html.DisplayNameFor( model => model.Age )
            </th>
            <th></th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model) {
                <tr>
                    <td>
                        @Html.DisplayFor(modelItem => item.Name)
                    </td>
                    <td>
                        @Html.DisplayFor(modelItem => item.Age)
                    </td>
                    <td>
                        <a asp-action="Edit" asp-route-id="@item.ID">Edit</a> |
                        <a asp-action="Details" asp-route-id="@item.ID">Details</a> |
                        <a asp-action="Delete" asp-route-id="@item.ID">Delete</a>
                    </td>
                </tr>
        }
    </tbody>
</table>

4）C# 中参数验证方式的演变