Int or Number DataType for DataAnnotation validation attribute

Question

On my MVC3 project  I store score prediction for football soccer hockey     sport game  So one of properties of my prediction class looks like this    Range 0  15  ErrorMessage    Can only be between 0    15     StringLength 2  ErrorMessage    Max 2 digits     Remote  PredictionOK    Predict   ErrorMessage    Prediction can only be a number in range 0    15    public int  HomeTeamPrediction   get  set      Now  I need also change error message for a data type  int in my case  There is some default one used -  The field HomeTeamPrediction must be a number    Need to find a way how to change this error message  This validation message also seem to take prediction for Remote validation one   I ve tried  DataType  attribute but this does not seem to be plain number in system componentmodel dataannotations datatype enumeration

User · Answer

I was able to bypass all the framework messages by making the property a string in my view model.

[Range(0, 15, ErrorMessage = "Can only be between 0 .. 15")]
[StringLength(2, ErrorMessage = "Max 2 digits")]
[Remote("PredictionOK", "Predict", ErrorMessage = "Prediction can only be a number in range 0 .. 15")]
public string HomeTeamPrediction { get; set; }

Then I need to do some conversion in my get method:

viewModel.HomeTeamPrediction = databaseModel.HomeTeamPrediction.ToString();

and post method:

databaseModel.HomeTeamPrediction = int.Parse(viewModel.HomeTeamPrediction);

This works best when using the range attribute, otherwise some additional validation would be needed to make sure the value is a number.

You can also specify the type of number by changing the numbers in the range to the correct type:

[Range(0, 10000000F, ErrorMessageResourceType = typeof(GauErrorMessages), ErrorMessageResourceName = nameof(GauErrorMessages.MoneyRange))]

User · Answer

almost a decade passed but the issue still valid with Asp Net Core 2 2 as well   I managed it by adding data-val-number to the input field the use localization on the message    lt input asp-for  Age  data-val-number    localize  Please enter a valid number      gt

User · Answer

Use regex in data annotation   RegularExpression    0-9      ErrorMessage    Please enter valid Number    public int MaxJsonLength   get  set

User · Answer

You can write a custom validation attribute   AttributeUsage AttributeTargets Property   AttributeTargets Field   AttributeTargets Parameter  AllowMultiple   false   public class Numeric   ValidationAttribute       public Numeric string errorMessage    base errorMessage                        lt summary gt          Check if given value is numeric          lt  summary gt           lt param name  quot value quot  gt The input value lt  param gt           lt returns gt True if value is numeric lt  returns gt      public override bool IsValid object value                return decimal TryParse value  ToString    out              On your property you can then use the following annotation   Numeric  quot Please fill in a valid number  quot    public int NumberOfBooks   get  set

User · Answer

For any number validation you have to use different different range validation as per your requirements    For Integer    Range 0  int MaxValue  ErrorMessage    Please enter valid integer Number      for float   Range 0  float MaxValue  ErrorMessage    Please enter valid float Number      for double   Range 0  double MaxValue  ErrorMessage    Please enter valid doubleNumber

User · Answer

ASP NET Core 3 1 This is my implementation of the feature  it works on server side as well as with jquery validation unobtrusive with a custom error message just like any other attribute  The attribute     AttributeUsage AttributeTargets Property  AllowMultiple   false  Inherited   false       public class MustBeIntegerAttribute   ValidationAttribute  IClientModelValidator               public void AddValidation ClientModelValidationContext context                        MergeAttribute context Attributes   quot data-val quot    quot true quot                var errorMsg   FormatErrorMessage context ModelMetadata GetDisplayName                 MergeAttribute context Attributes   quot data-val-mustbeinteger quot   errorMsg                      public override bool IsValid object value                        return int TryParse value  ToString       quot  quot   out int newVal                      private bool MergeAttribute                IDictionary lt string  string gt  attributes                string key                string value                        if  attributes ContainsKey key                                 return false                            attributes Add key  value               return true                   Client side logic    validator addMethod  quot mustbeinteger quot       function  value  element  parameters            return  isNaN parseInt value    amp  amp  isFinite value              validator unobtrusive adapters add  quot mustbeinteger quot       function  options        options rules mustbeinteger           options messages  quot mustbeinteger quot     options message       And finally the Usage    MustBeInteger ErrorMessage    quot You must provide a valid number quot     public int SomeNumber   get  set

User · Answer

public class IsNumericAttribute   ValidationAttribute       protected override ValidationResult IsValid object value  ValidationContext validationContext                if  value    null                        decimal val              var isNumeric   decimal TryParse value ToString    out val                if   isNumeric                                                   return new ValidationResult  Must be numeric                                                         return ValidationResult Success

User · Answer

Try this attribute    public class NumericAttribute   ValidationAttribute  IClientValidatable        public override bool IsValid object value            return value ToString   All c   gt   c  gt    0   amp  amp  c  lt    9      c     -     c                      public IEnumerable lt ModelClientValidationRule gt  GetClientValidationRules ModelMetadata metadata  ControllerContext context            var rule   new ModelClientValidationRule                       ErrorMessage   FormatErrorMessage metadata DisplayName               ValidationType    numeric                     yield return rule            And also you must register the attribute in the validator plugin   if   validator          validator unobtrusive adapters add           numeric       function  options                options rules  numeric     options params              options messages  numeric     options message

User · Answer

Try one of these regular expressions      for numbers that need to start with a zero  RegularExpression    0-9             for numbers that begin from 1  RegularExpression    1-9  0-9          hope it helps  D

[asp.net-mvc] Int or Number DataType for DataAnnotation validation attribute

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