在这里，我将 IRepository<Network> 服务添加到服务容器，然后该类AdminController使用它。这个实现是反模式吗локатор сервисов？
public void ConfigureServices(IServiceCollection services)
{
...
services.AddTransient<IRepository<Network>, EFRepository<Network>>();
...
}
public class AdminController : Controller
{
private readonly IRepository<Network> _dbContext;
public AdminController(IRepository<Network> dbContext)
{
_dbContext = dbContext;
}
}
我将数据库上下文添加到服务中。我可以从 app.MapGet() 访问它。但在此之前，我想通过 Use 处理请求。如何访问数据库里面的Use？
var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddDbContext<UserContext>();
builder.Services.AddCors(options =>
{
options.AddDefaultPolicy(policy => { policy.WithOrigins("*"); });
});
var app = builder.Build();
if (app.Environment.IsDevelopment())
{
app.UseSwagger();
app.UseSwaggerUI();
}
app.UseHttpsRedirection();
app.UseCors();
app.Use(async (context, next) =>
{
// Здесь должно быть обращение к БД
await next.Invoke(context);
});
app.MapGet("/vk/main_info", async (int vk_user_id, UserContext database) =>
{
// Тут дальнейшая обработка запроса
});
app.Run();
我有一个包含图片列的数据库。如何将图片插入数据库，然后通过什么类型的数据上传到Asp .net 控制器，再上传到angular。据我所知，这是一个 byte[] 数据类型，但这是在服务器端，但在 Angular 中呢？即使你把任何，那么图片根本不加载。
D B：
服务器端数据库模型：
public class Clothes
{
public int ClothesId { get; set; }
public string VendorCode { get; set; }
public string Name { get; set; }
public byte[] Image { get; set; }
public int Amount { get; set; }
public int Price { get; set; }
}
角度数据模型：
export class Clothes{
vendorCode = "";
name = "";
image:any = [];
amount = 0;
price = 0;
}
我想用angular和asp做一个服装店，但是我遇到了将数据发送到数据库的困难。有一个用于注册和授权的模块化表格。首先，我决定实现注册表单，但是发送数据时出错：
我是新手，所以我附上了代码，因为我不知道错误的问题是什么。
用户.ts：
export class Users{
id? = "";
phone = "";
email = "";
fio = "";
address ="";
password = "";
}
用户服务.ts：
@Injectable({
providedIn: 'root'
})
export class UserServiceService {
private url = "User";
constructor(private http: HttpClient) {
}
@Input() public createUser(users: Users): Observable<Users> {
return this.http.post<Users>(
`${environment.apiUrl}/${this.url}`,
users
);
导航菜单.ts：
export class NavMenuComponent {
user:Users =new Users;
@Output() userUpdated = new EventEmitter<Users>();
constructor(private superHeroService: UserServiceService) {}
createnewUser(users: Users) {
this.superHeroService
.createUser(users)
.subscribe((users: Users) => this.userUpdated.emit(users));
}
}
从输入中读取变量：
<div class="modal-body">
<input [(ngModel)]="user.email" class="form-control">
<input [(ngModel)]="user.phone" class="form-control">
<input [(ngModel)]="user.address" class="form-control">
<input [(ngModel)]="user.fio" class="form-control">
<input type="password" [(ngModel)]="user.password" class="form-control"> :
<input type="password" class="form-control">
</div>后端：
用户控制器.cs：
[Route("api/[controller]")]
[ApiController]
public class UserController : Controller
{
private readonly DataContext _context;
public UserController(DataContext context)
{
_context = context;
}
[HttpPost]
public async Task<IActionResult> CreateUser(User user)
{
_context.Users.Add(user);
await _context.SaveChangesAsync();
return Ok(await _context.Users.ToListAsync());
}
}
数据上下文.cs：
public class DataContext : DbContext
{
public DataContext(DbContextOptions<DataContext> options) : base(options)
{
Database.EnsureCreated();
}
public DbSet<User> Users => Set<User>();
}
User.cs：公共类用户
{
public string? Id = string.Empty;
public string Phone = string.Empty;
public string Email = string.Empty;
public string FIO = string.Empty;
public string Password = string.Empty;
}
告诉我如何连接这两个实体，以便在数据库中创建 2 个相关表。我读了一篇关于 metanit 的文章，我无法理解。您收到InvalidOperationException ：无法添加实体类型“Employee”的种子实体，因为没有为所需的属性“DepartmentId”提供值。
public class Department
{
[Key]
public int DepartmentId { get; set; }
public string Name { get; set; } = null!;
}
public class Employee
{
[Key]
public int EmployeeId { get; set; }
public string FirstName { get; set; } = null!;
public string LastName { get; set; } = null!;
public string DateOfBirth { get; set; } = null!;
public string Adress { get; set; } = null!;
public int DepartmentId { get; set; }
[ForeignKey("DepartmentId")]
public Department Department { get; set; } = null!;
public string? Description { get; set; }
}
public class AppDbContext : DbContext, IDbContext
{
public DbSet<Employee> Employees { get; set; } = null!;
public DbSet<Department> Departments { get; set; } = null!;
public AppDbContext(DbContextOptions<AppDbContext> options) : base(options)
{
Database.EnsureCreated();
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Department>().HasData(
new Department { DepartmentId = 1, Name = "Dev" },
new Department { DepartmentId = 2, Name = "Marketing" },
new Department { DepartmentId = 3, Name = "Art" });
modelBuilder.Entity<Employee>().HasData(
new Employee { Id = 1, FirstName = "Максим", LastName = "Максимов",Department = new(1,"DepName1"), DateOfBirth = "22.11.1990", Adress = "Novosibirsk", Description = "" },
new Employee { Id = 2, FirstName = "Иван", LastName = "Иванов", Department = new(2, "DepName2"), DateOfBirth = "12.02.1996", Adress = "SPB", Description = ""},
new Employee { Id = 3, FirstName = "Дмитрий", LastName = "Дмитриев", Department = new(3, "DepName3"), DateOfBirth = "10.06.1998",Adress = "MSK", Description = ""});
}
}