c# - 编辑时禁用用户名验证

Question

我为唯一用户名创建了验证，现在我无法编辑我的用户。它说用户名已被占用，这是有道理的，因为它已被我尝试编辑的用户占用。我什至不想编辑用户名，但由于这个错误，我也无法编辑任何其他字段。

如何为我的 EDIT 操作禁用唯一用户名验证？

验证者

public override bool IsValid(object value)
{
    if (value == null) return false;
    FinanceDataContext _db = new FinanceDataContext();
    var user = _db.Users.ToList().Where(x => x.Username.ToLower() == value.ToString().ToLower()).SingleOrDefault();
    if (user == null) return true;
    return false;
}

Action

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(User u)
{
    // Get user we want to edit
    var user = _db.Users.Where(x => x.ID == u.ID).SingleOrDefault();
    if (user == null) return HttpNotFound();

    // Set values and save changes
    user.Address = u.Address;
    if (!string.IsNullOrEmpty(u.Password)) user.Password = Infrastructure.Encryption.SHA256(u.Password);
    _db.SaveChanges(); // validation error

    return null;
}

模型

public class User
{
    public int ID { get; set; }

    [Required]
    [UniqueUsername(ErrorMessage = "Username is already taken")]
    public string Username { get; set; }

    [Required]
    public string Password { get; set; }

    public string Address { get; set; }
}

错误

Validation failed for one or more entities. See 'EntityValidationErrors' property for more details.

Answer 1

在 UniqueUsername 属性的“AdditionalFields”参数中传递“ID”属性，所以我猜你的代码应该是这样的

类属性:

[Required]
[UniqueUsername(ErrorMessage = "Username is already taken", AdditionalFields = "ID")]
public string Username { get; set; }

验证操作:

public ActionResult UniqueUsername(string userName, int id)
{
    FinanceDataContext _db = new FinanceDataContext();
    var user = _db.Users.ToList().SingleOrDefault(x => x.Username.ToLower() == value.ToString().ToLower() && x.ID != id);
    return Json(user == null, JsonRequestBehavior.AllowGet);
}

希望这会有所帮助!!