Min Max-value validators in asp net mvc

Question

Validation using attributes in asp net mvc is really nice  I have been using the  Range min  max   validator this far for checking values  like e g      Range 1  10   public int SomeNumber   get  set      However - now I need to check the min and max condition separately  I expected to find attributes like these     MinValue 1   Value must be at least 1     MaxValue 10   Value can t be more than 10    public int SomeNumber   get  set      Are there any predefined attributes for writing this  Or how do I achieve this

User · Answer

jQuery Validation Plugin already implements min and max rules, we just need to create an adapter for our custom attribute:

public class MaxAttribute : ValidationAttribute, IClientValidatable
{
    private readonly int maxValue;

    public MaxAttribute(int maxValue)
    {
        this.maxValue = maxValue;
    }

    public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
    {
        var rule = new ModelClientValidationRule();

        rule.ErrorMessage = ErrorMessageString, maxValue;

        rule.ValidationType = "max";
        rule.ValidationParameters.Add("max", maxValue);
        yield return rule;
    }

    public override bool IsValid(object value)
    {
        return (int)value <= maxValue;
    }
}

Adapter:

$.validator.unobtrusive.adapters.add(
   'max',
   ['max'],
   function (options) {
       options.rules['max'] = parseInt(options.params['max'], 10);
       options.messages['max'] = options.message;
   });

Min attribute would be very similar.

User · Answer

A complete example of how this could be done  To avoid having to write client-side validation scripts  the existing ValidationType    range  has been used   public class MinValueAttribute   ValidationAttribute  IClientValidatable       private readonly double  minValue       public MinValueAttribute double minValue                 minValue   minValue          ErrorMessage    Enter a value greater than or equal to      minValue               public MinValueAttribute int minValue                 minValue   minValue          ErrorMessage    Enter a value greater than or equal to      minValue             public override bool IsValid object value                return Convert ToDouble value   gt    minValue             public IEnumerable lt ModelClientValidationRule gt  GetClientValidationRules ModelMetadata metadata  ControllerContext context                var rule   new ModelClientValidationRule            rule ErrorMessage   ErrorMessage          rule ValidationParameters Add  min    minValue           rule ValidationParameters Add  max   Double MaxValue           rule ValidationType    range           yield return rule

User · Answer

Here is how I would write a validator for MaxValue  public class MaxValueAttribute   ValidationAttribute               private readonly int  maxValue           public MaxValueAttribute int maxValue                         maxValue   maxValue                     public override bool IsValid object value                        return  int  value  lt    maxValue                    The MinValue Attribute should be fairly the same

User · Answer

I don t think min max validations attribute exist  I would use something like    Range 1  Int32 MaxValue     for minimum value 1 and    Range Int32 MinValue  10     for maximum value 10

[asp.net-mvc-3] Min/Max-value validators in asp.net mvc

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