7/25/2023 0 Comments Data annotations display name![]() Exception or Error Handling and Logging in MVC4.Html submission by ValidateInput and AllowHtml attribute in MVC4.Different ways of rendering layouts in Asp.Net MVC.How to get textboxes values in MVC4 created by jQuery.Custom Validation for Cascading Dropdownlist in MVC Razor.Changing browser URL with jQuery mobile and Asp.Net MVC.Understanding ASP.NET MVC Filters and Attributes.Understanding HTML Helpers in ASP.NET MVC.Understanding AJAX Helpers in ASP.NET MVC.Layouts, RenderBody, RenderSection and RenderPage in ASP.NET MVC.Understanding Attribute Routing in ASP.NET MVC. ![]() Understanding Internationalization in ASP.NET MVC.JavaScript ES6 Interview Questions Answers BookĪSP.NET Web API Questions and Answers Book NET Framework Questions and Answers BookĪSP.NET and AJAX Questions and Answers BookĮntity Framework 6.x Questions and Answers BookĮntity Framework Core Questions and Answers BookĪzure Administrator Questions and Answers BookĪzure Developer Questions and Answers Book NET Design Patterns Questions and Answers Book In the example above the validation would fail since name only contains three characters the minimum length is set to four characters.NET Microservices Certification TrainingĪSP.NET MVC with WebAPI Certification TrainingĪWS Solutions Architect Certification TrainingĪzure Fundamentals Certification TrainingĪrtificial Intelligence Certification Courseĭata Science with Python Certification Courseĭocker and Kubernetes Certification Trainingįrontend Foundations Certification Training The function call returns false if any properties fail validation. Validator.TryValidateObject takes the model to be validated, a validation context (created with the model to validate) and an empty list of type ValidationResult. If (!Validator.TryValidateObject(contact, context, errors))įoreach (ValidationResult result in errors) Var context = new ValidationContext(contact) If the property does have a value then null is returned indicating that the property is valid. If the property does not have a value then a new ValidationResult is returned with an error message. If that country is found in the string array of countries that require the property being validated then a check is run to make sure the property has a value and is not blank. Using the property info for the country property we can call GetValue with context.ObjectInstance to get the contact’s country. In this case a new ValidationResult is returned with a message that the expected country property was not found. If GetProperty returns null then the context did not contain the property that was expected. The first step to checking a different property than the one being validated is to get the property info from the validation context by using and passing the property name that was passed in via the constructor. The validation context will allow us to access other properties on the model being validated. ![]() The overload of IsValid we are working with provides the value of the property being validated and the validation context that validation is running for. The IsValid function is still where all the work takes place. Both parameters are stored in class level variables for use in the IsValid function. Return new ValidationResult(context.DisplayName +įor this example I have added a constructor that takes the name of the country property in the model being validated and a string array of the countries that need to make sure the state and zip code are filled in. String.IsNullOrWhiteSpace(value.ToString()))) If (_requriedB圜ountries.Contains(country.ToString()) & Var country = propertyInfo.GetValue(context.ObjectInstance, null) Return new ValidationResult(_countryProperty + Protected override ValidationResult IsValid(object value, _requriedB圜ountries = requriedB圜ountries Public ValidCountryRequired(string countryProperty, Private readonly string _requriedB圜ountries ![]() Private readonly string _countryProperty Public class ValidCountryRequired : ValidationAttribute IsValid is still overridden, but it is a different overload than the previous example that provides access to the ValidationContext, which in our case is the contact model that is being validated. Again using the contact application example, lets say that if a contact has a country of USA then state and zip code are required.Īs before we have class which inherits from ValidationAttribute. I am going to expand on last week’s Simple Custom Validation Attributes with custom validation attributes that need to look at more than a single property of a model.
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