SQL Server数据库C＃中的空值

Posted 2021-05-07

我正在使用ASP.NET Core，Visual Studio Code创建注册/登录Web应用。当我填写“注册”页面标签（用户名，密码，电子邮件，全名）并单击“保存”按钮时，它会将值存储在数据库中，但所有内容均为NULL。

Screenshot of my database

我使用VS Code（dotnet ef migrations add InitialCreate ..... dotnet ef database update）进行迁移创建了数据库。类型是nvarchar(max)，但我认为不是问题的原因。

这是我的代码：

迁移：

using Microsoft.EntityFrameworkCore.Migrations;

namespace probagetrequest.Migrations
{
    public partial class InitialCreate : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.CreateTable(
                name: "Account",
                columns: table => new
                {
                    Id = table.Column<int>(nullable: false)
                        .Annotation("SqlServer:Identity", "1, 1"),
                    Username = table.Column<string>(nullable: true),
                    Password = table.Column<string>(nullable: true),
                    FullName = table.Column<string>(nullable: true),
                    Email = table.Column<string>(nullable: true)
                },
                constraints: table =>
                {
                    table.PrimaryKey("PK_Account", x => x.Id);
                });
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropTable(
                name: "Account");
        }
    }
}

// <auto-generated />
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Migrations;
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
using probagetrequest.Models;

namespace probagetrequest.Migrations
{
    [DbContext(typeof(DatabaseContext))]
    [Migration("20200411075219_InitialCreate")]
    partial class InitialCreate
    {
        protected override void BuildTargetModel(ModelBuilder modelBuilder)
        {
#pragma warning disable 612, 618
            modelBuilder
                .HasAnnotation("ProductVersion", "3.1.3")
                .HasAnnotation("Relational:MaxIdentifierLength", 128)
                .HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);

            modelBuilder.Entity("probagetrequest.Models.Account", b =>
                {
                    b.Property<int>("Id")
                        .ValueGeneratedOnAdd()
                        .HasColumnType("int")
                        .HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);

                    b.Property<string>("Email")
                        .HasColumnType("nvarchar(max)");

                    b.Property<string>("FullName")
                        .HasColumnType("nvarchar(max)");

                    b.Property<string>("Password")
                        .HasColumnType("nvarchar(max)");

                    b.Property<string>("Username")
                        .HasColumnType("nvarchar(max)");

                    b.HasKey("Id");

                    b.ToTable("Account");
                });
#pragma warning restore 612, 618
        }
    }
}

// <auto-generated />
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Metadata;
using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
using probagetrequest.Models;

namespace probagetrequest.Migrations
{
    [DbContext(typeof(DatabaseContext))]
    partial class DatabaseContextModelSnapshot : ModelSnapshot
    {
        protected override void BuildModel(ModelBuilder modelBuilder)
        {
#pragma warning disable 612, 618
            modelBuilder
                .HasAnnotation("ProductVersion", "3.1.3")
                .HasAnnotation("Relational:MaxIdentifierLength", 128)
                .HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);

            modelBuilder.Entity("probagetrequest.Models.Account", b =>
                {
                    b.Property<int>("Id")
                        .ValueGeneratedOnAdd()
                        .HasColumnType("int")
                        .HasAnnotation("SqlServer:ValueGenerationStrategy", SqlServerValueGenerationStrategy.IdentityColumn);

                    b.Property<string>("Email")
                        .HasColumnType("nvarchar(max)");

                    b.Property<string>("FullName")
                        .HasColumnType("nvarchar(max)");

                    b.Property<string>("Password")
                        .HasColumnType("nvarchar(max)");

                    b.Property<string>("Username")
                        .HasColumnType("nvarchar(max)");

                    b.HasKey("Id");

                    b.ToTable("Account");
                });
#pragma warning restore 612, 618
        }
    }
}

这里是模型类：

namespace probagetrequest.Models
{
    [Table("Account")]
    public class Account
    {
        [Key]
        public int Id { get; set; }
        public string Username { get; set; }
        public string Password { get; set; }
        public string FullName { get; set; }
        public string Email { get; set; }
    }

}

DatabaseContext：

using Microsoft.EntityFrameworkCore;

namespace probagetrequest.Models
{
    public class DatabaseContext : DbContext
    {
        public DatabaseContext(DbContextOptions<DatabaseContext> options) : base(options)
        {
        }

        public DbSet<Account> Accounts { get; set; }
    }
}

这里是SignUp.cshtml.cs：

using Microsoft.AspNetCore.Mvc.RazorPages;
using Microsoft.AspNetCore.Mvc;
using probagetrequest.Models;

namespace probagetrequest.Pages
{
    public class SignUpModel : PageModel
    {
        [BindProperty]
        public Account account { get; set; }

        private DatabaseContext db;
        public SignUpModel(DatabaseContext _db)
        {
            db = _db;
        }

        public void OnGet()
        {
            account = new Account();
        }

        public IActionResult OnPost()
        {
            account.Password = BCrypt.Net.BCrypt.HashPassword(account.Password);
            db.Accounts.Add(account);
            db.SaveChanges();
            return RedirectToPage("index");
        }
    }
}

SignUp.cshtml：

@page
@model probagetrequest.Pages.SignUpModel
@{
    Layout = null;
}

<!DOCTYPE html>

<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>SignUp</title>
</head>
<body>

<h3>Sign Up</h3>
<form method="post" asp-page="signup">
    <table>
        <tr>
            <td>Username</td>
            <td>
                <input aps-for="@Model.account.Username" />
            </td>
        </tr>
        <tr>
            <td>Password</td>
            <td>
                <input type="password" asp-for="@Model.account.Password" />
            </td>
        </tr>
        <tr>
            <td>Full Name</td>
            <td>
                <input aps-for="@Model.account.FullName" />
            </td>
        </tr>
        <tr>
            <td>Email</td>
            <td>
                <input type="email" aps-for="@Model.account.Email" />
            </td>
        </tr>
        <tr>
            <td>&nbsp;</td>
            <td>
                <input type="submit" value="Save" />
                <br />
                <a asp-page="index">Sign In</a>
            </td>
        </tr>
    </table>
</form>
</body>
</html>

答案

请注意您的拼写，应该是asp-for而不是aps-for。否则您的模型绑定将不起作用。