IValidatableObject实现model自定义验证

namespace: System.ComponentModel.DataAnnotations

Assembly:  System.ComponentModel.DataAnnotations (in System.ComponentModel.DataAnnotations.dll)

Example:

    public class IACUCRenewMembership : IValidatableObject
    {
        [DataMember]
        [Required(ErrorMessage="Membership Term Start Date is required.")]
        public DateTime MembershipStartDate { get; set; }
        [DataMember]
        [Required(ErrorMessage = "Membership Term End Date is required.")]
        public DateTime MembershipEndDate { get; set; }
        [DataMember]
        [Required(ErrorMessage = "Please select member.")]
        public string SelectedMemberList { get; set; }

        public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
        {
            if (MembershipStartDate >= MembershipEndDate)
                yield return new ValidationResult("Start Date can not be greater than End Date.");
        }
    }

Trigger validatation and return error messages in json format:

        public ActionResult RenewMembership(IACUCMemberLogModel model)
        {
            var client = new IACUCServiceClient();
            try
            {
                if (ModelState.IsValid)
                {
                   // Perform business logic
                }
                else
                {
                    return Json(ModelState.Values.SelectMany(x => x.Errors).Select(x => x.ErrorMessage).ToList());
                }
            }
            catch (Exception ex)
            {
                return Json(new List<string>() { ex.Message });
            }
            finally
            {
                CleanUpServiceClient(client, client.InnerChannel);
            }
        }

 

扩展内容：

MVC Foolproof Validation

MVC Foolproof Validation aims to extend the Data Annotation validation provided in ASP.NET MVC. Initial efforts are focused on adding contingent validation.

 

参考链接

https://msdn.microsoft.com/en-us/library/system.componentmodel.dataannotations.ivalidatableobject(v=vs.110).aspx