MVC5_6.4_DataAnnotations

2018-08-07

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MVC
2018-08-19

System.ComponentModel.DataAnnotations

1.Create Model (Code First)

2.Create Controller

3.Auto create view

4. add Script on below Create.html

5.add Attribute in Model

(1) Compare

(2)CustomValidation <Server>

1.) create new class for CustomValidation

 public class QualifiedAgeAttribute : ValidationAttribute
    {
        // Fields
        private int _qualifiedAge;

        // Constructors
        public QualifiedAgeAttribute(int qualifiedAge)
        {
            this._qualifiedAge = qualifiedAge;
        }

        // Methods
        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            DateTime birthday = (DateTime)value;
            int age = new DateTime(DateTime.Now.Subtract(birthday).Ticks).Year - 1;

            if (age >= _qualifiedAge)
            {
                // valid
                return ValidationResult.Success;
            }
            else
            {
                // invalid
                var errorMsg = string.Format("Your age({0}) should be over {1}", age, _qualifiedAge);
                return new ValidationResult(errorMsg);
            }
        }
    }

2.) add Attribute