![]() Still, I wanted to give the current implementation a test, and luckily this is pretty simple to setup, as all the ASP.NET Core packages produced as part of the normal development workflow are pushed to various public MyGet feeds. Theoretically that means it should appear in the 1.1.0 release when that happens, but we are at very early days at the moment! Luckily, this has already been fixed and is currently on the development branch of the ASP.NET Core repo. The localisation of the ValidationAttribute.ErrorMessage happens deep in the inner workings of the MVC pipeline (in the DataAnnotationsMetadataProvider) and this is ideally where the localisation of the DisplayAttribute should be happening. Unfortunately it's a tricky problem to work around currently, in that it's just fundamentally not supported in the current version of MVC. That's especially true if you're not using Visual Studio, and so don't have the resx-auto-generation process. If that seems like a lot of work to get a localised DisplayAttribute then you're not wrong. How to localise DisplayAttribute in the future If we run our application again, you can see that the display attribute is now localised to say 'Votre Email' - lovely! These allow you to retrieve the localised version of a key by passing in a string if the key does not exist for that resource, or you are using the default culture, the key itself is returned as the resource: public class ExampleClass Localisation is handled in ASP.NET Core through two main abstractions IStringLocalizer and IStringLocalizer. If you would like a more detailed description, check out my previous post or the documentation. Just so we're all on the same page, I'll briefly recap how localisation works in ASP.NET Core. In this post, we cover some of the problems you may run into when localising your application and approaches to deal with them. At the end of that article, we had localised our application so that the user could choose their culture, which would update the page title and the validation attributes with the appropriate translation, but not the form labels. ![]() We have already created the view in previous example, now its time to run the application and check the validation.This post follows on from my previous post about localising an ASP.NET Core application. In our case, we are about to use this attribute over the Employee model class, so I have typecast it into Employee Type.Ĥ.I have not used any Database logic, you are free to write any logic you want.ĥ.If an error occurs simply return an instance of ValidationResult with an error message as a parameter or return Success, which is a read-only static field.Ħ.Mark the Name property of the Employee class with this custom attribute like below. Return new ValidationResult("UserName is in use") ġ.I have used the same Employee model so that it would be easy for you to understand.Ģ.I have used the second overloaded version of IsValid() which accepts two parameters one is incoming submitted value and the other is ValidationContext.ValidationContext gives us access to containing container meaning it gives us access to the class which is using it.ģ.ValidationContext.ObjectInstance is used to create an object of the container class. [DisplayFormat(DataFormatString = " Įmployee emp = (Employee)validationContext.ObjectInstance īool istrue = names.Any(x => x = emp.Name) Use this attribute to specify a specific date format. Use it to specify the maximum accepted length for a property. Use it on a property so that it could be used in view for display purposes. Use it specify the maximum and minimum length of a string property. Use it to specify a numeric range of values for a field. Use it to specify the data type of property of an entity explicitly. Each DataAnnotion has different validation rules.īelow are the different DataAnnotations available in Asp.Net MVC. In Asp.Net MVC ,we have DataAnnotations ,which is much easier to use than webform's validators.ĭataAnnotations are actually attributes in MVC ,which can be applied to any model property. In Asp.Net WebForm we had different validation controls like RequiredField validator,Compare validator,Range validator,RegularExpression validator etc to validate user inputs in server controls. DataAnnotation in MVC Html.validationMessage Html.ValidationMessageFor Html.ValidationSummary custom validation attribute
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