asp.net-mvc – 如何手动检查模型是否有效并获取错误消息

namespace TestMVC.Models.ViewModel
{
   public partial class User
    {

        public string Name { get; set; }
        public int Age { get; set; }
        public string Email { get; set; }

    }

    [MetadataType(typeof(UserMetaData))]
    public partial class User
    {


    }

public class UserMetaData
{
    [Display(Name = "Name")]
    public string Name { get; set; }
    [Display(Name = "Age")]
    public int Age { get; set; }
    [Display(Name = "Email")]
    [RegularExpression(@"^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$", ErrorMessage = "The email is invalid")]
    public string Email { get; set; }
}
}

我有一个像这样的方法：

public ActionResult ValidCheck()
    {
        ModelState.AddModelError("error", "error");
        Models.ViewModel.User model = new Models.ViewModel.User();
        model.Age = 12;
        model.Name = "Andy He";
        model.Email = "123";
        //TryValidateModel(model);
     }

我想通过方法来检查模型是否有效并获取错误消息,我尝试使用TryValideModel但它只能获得模型有效的结果,无法获取错误消息,是否有方法可以做这个？你能帮帮我吗？

使用ModelState.IsValid属性.它告诉您是否有任何模型错误已添加到ModelState. ModelState.Isvalid

试试这样.

ModelState.AddModelError("Email ", "error");  here you are setting model error for particular key. 

if(!ModelState.IsValid)
{
  // do something to display errors .  
     foreach (ModelState modelState in ViewData.ModelState.Values) {
                foreach (ModelError error in modelState.Errors) {
                  DoSomethingWith(error);
            }
        }
}