c# - 是否可以为 Asp.Net MVC 中的特定角色制作模型属性属性？

Question

是否可以只要求指定角色对数据注释的模型字段进行建模？

例如:

[Display(Name = "Kurum")]
[Required(ErrorMessage = "Kurum Alanı Girişi Zorunludur.",Roles="user")]
public decimal? KurumKodu { get; set; }

我知道没有像 Required(Roles="xxxx") 这样的参数，但我想知道是否还有其他解决方案？

谢谢。

Answer 1

您必须为此创建自定义验证属性。下面的代码可以帮助您做到这一点。

      public class RequiredIfAttribute : RequiredAttribute
        {
            private string PropertyName { get; set; }
            private object DesiredValue { get; set; }

            public RequiredIfAttribute(string propertyName, object desiredvalue)
            {
                PropertyName = propertyName;
                DesiredValue = desiredvalue;
            }

            protected override ValidationResult IsValid(object value, ValidationContext context)
            {
                object instance = context.ObjectInstance;
                Type type = instance.GetType();
                Object proprtyvalue = type.GetProperty(PropertyName).GetValue(instance, null);
                if (proprtyvalue.ToString() == DesiredValue.ToString())
                {
                    ValidationResult result = base.IsValid(value, context);
                    return result;
                }
                return ValidationResult.Success;
            }
        }

然后你必须用这个属性装饰你的属性(阅读代码中的注释理解)

        public class User
        {
            /// <summary>
            /// Gets or Sets Usertype.
            /// </summary>
            public string UserType { get; set; }

            /// <summary>
            /// Gets or Sets KurumKodu.
            /// Here "Usertype" is property. In that you have to assign current user's role.
            /// "user" is constant role. If  "UserType" has value as "user" then this will be required.
            /// </summary>
            [RequiredIf("UserType", "user", ErrorMessage = "It is required")]
            public decimal KurumKodu { get; set; }
        }

如果您想添加客户端验证(不显眼)，请参阅下面的链接。

RequiredIf Conditional Validation Attribute