range-attribute

ASP.NET Core – Create a custom model validation attribute

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There are many built-in model validation attributes available – such as [Required] and [Range] – which you can use to handle most validation scenarios. When these aren’t sufficient, you can create a custom validation attribute with your own validation logic. I’ll show an example of how to do that. 1 – Subclass ValidationAttribute and implement … Read more

ASP.NET Core – API model validation attributes

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It’s always a good idea to validate data coming into your web API. There are two steps you can do to guard against invalid data: Here’s an example of using model validation attributes: When a request comes in, the framework does two things: Let’s say you send a request with invalid data (boxOfficeMillions is outside … Read more

ASP.NET Core – Get posted form data in an API Controller

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To get posted form data in an API Controller (using the [ApiController] attribute) in ASP.NET Core, use parameters with the [FromForm] attribute. Now send a request with form data to this endpoint to see it work. The request would look like this: The form data is a string of key-value pairs (ex: location=United+States). The framework … Read more