Useful data annotations that are new in .NET 8
There are some new data annotations in .NET 8 that can be used for model validation in ASP.NET Core MVC and Web API.
These include being able to validate a Base64 string, specifying any allowed and denied values through the AllowedValues and DeniedValues attributes, and specify the number of items that appears in a list.
In-addition, there is also additional properties added to the Range attribute where you can mark whether the minimum or maximum is exclusive. Essentially, you can throw a validation error if the value is equal to either the minimum or maximum.
In this video, we'll write a model validation class that we'll use in an ASP.NET Core Web API controller endpoint. Afterwards, we'll test the validation out in Swagger to see how it works.
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► Chapters
0:00 What we'll cover
0:16 Writing the model for validation
2:18 Writing the controller for validation
2:53 Test out the validation in Swagger
4:30 More data annotations in .NET
#validation #webapi #dotnet
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