如何使InjectAttribute与IValidatableObject一起使用

Question

我有这个ViewModel

public class CustomerSuscribeViewModel : IValidatableObject
{
    [DataMember(IsRequired = true)]
    [DataType(DataType.Text)]
    public string Name { get; set; }

    public string SurName { get; set; }

    [DataMember(IsRequired = true)]
    [DataType(DataType.Password)]
    public string Password { get; set; }

    [DataMember(IsRequired = true)]
    [DataType(DataType.Password)]
    public string ConfirmPassword { get; set; }

    [DataMember(IsRequired = true)]
    [DataType(DataType.EmailAddress)]
    public string Email { get; set; }

    [Inject]
    public IDataUsers DataUsers { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {

        if(DataUsers.Get(new UserFilter() {Email = Email}).Any())
        {
            yield return new ValidationResult(This Email is already used.",new string[]{"Email"});
        }
        if(ConfirmPassword != Password)
            yield return new ValidationResult("Please confirm your apssword", new string[] { "Password", "ConfirmPassword" });
    }
}

这个动作

[HttpPost]
        public ActionResult Suscribe(CustomerSuscribeViewModel customer)
        {
            if (!ModelState.IsValid)
                return View(customer);

问题是成员DataUsers永远不会被创建,所以我得到一个NullReferenceException.

绑定通过以下方式完成:

Bind<IDataUsers>().To<DataUsers>();

任何的想法 ？

编辑:InjectAttribute适用于我的控制器内的属性.

Environnement:asp.net mvc 3,ninject 2.2(也许我需要更新？)

Answer 1

Ninject不会创建视图模型,因此会忽略inject属性.通常,视图模型应该保持简单并且没有依赖性.你可以用ValidationAttributes代替IValidatableObject

阅读有关注入验证属性的https://github.com/ninject/ninject.web.mvc/wiki/Injection-of-validators.

• 示例:https://github.com/ninject/ninject.web.mvc/blob/master/mvc3/src/SampleApplication/Models/Movie/PriceRangeAttribute.cs

下面是一个示例,说明如何使用以下方法实现密码与确认密码匹配的验证ValidationAttribute:

• 实施:https://github.com/ninject/ninject.web.mvc/blob/master/mvc3/src/SampleApplication/Models/Account/CompareAttribute.cs
• 用法:https://github.com/ninject/ninject.web.mvc/blob/master/mvc3/src/SampleApplication/Models/Account/RegisterModel.cs