Contents tagged with Validation
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.NET 8 Data Annotations Validation
3 CommentsI wrote about entity validation in the past, the reason I'm coming back to it is that there are some changes in .NET 8, that I haven't revisited. Time for a refresher!
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EF Core Entity Validation
8 CommentsNote: I wrote a post about Data Annotations validation here.
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Unit Testing .NET Core
No CommentsWith the recent arrival of .NET Core, some things that we were used to having are no longer available. This includes unit tests – plus Visual Studio integration - and mocking frameworks. Fortunately, they are now becoming available, even if, in some cases, in pre-release form.
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Fluent Validation in JavaScript
4 CommentsA recent discussion with my colleagues about fluent validation in JavaScript made me realize that I didn’t know of any such library. I take it for granted that some may exist, but I have never actually used one. To be clear, I mean a validation library that I can use in unit tests, for asserting conditions. Because I had a free Saturday morning, I decided to write my own!
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Case Study: Comparing ASP.NET Web Forms and MVC Implementations
5 CommentsApparently, I am the last ASP.NET Web Forms developer in the whole World, which makes me kind of sad... anyway, after much crying, I decided to try out something: a comparison of Web Forms and MVC to solve a real life problem! Now, I only needed a problem to solve... Then, a colleague of mine came questioning me about captchas, so I thought, why not use it as my example? And here we are!
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Adding Custom Validation Messages in Silverlight
No CommentsSometimes it is useful to add our own validation messages to a Silverlight control, normally because we are doing custom validation through code, not through the reguar IDataErrorInfo, INotifyDataErrorInfo or ValidationAttributes. This is not straightforward, but it is possible. An example might be:
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ASP.NET Web Forms Prompt Validator
No CommentsFor those still using Web Forms and Microsoft’s validation framework, like yours truly - and I know you’re out there! -, it is very easy to implement custom validation by leveraging the CustomValidator control. It allows us to specify both a client-side validation JavaScript function and a server-side validation event handler.
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Entity Framework Pitfalls: String Length Validation
No CommentsIf you want to validate the maximum number of characters that a string property can take, you might be lured into using MaxLengthAttribute. However, this won’t give you what you want: what this attribute does is, when a model is being generated, it provides the maximum length of the string field in the database, but does not perform any kind of pre-insert or pre-update validation. For that, you need to use StringLengthAttribute. This one is indeed a validation attribute, inheriting from ValidationAttribute, and will be called when EF is about to persist your entity, or when ASP.NET MVC validates a model as a consequence of a post. You can specify both the minimum (MinimumLength) as well as the maximum length (MaximumLength).
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NHibernate Fluent Validation
No CommentsSome time ago, I wrote a post on fluent validation for Entity Framework Code First. I think it is a cool concept, and I decided to bring it into NHibernate!
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Entity Framework Pitfalls: Validation Does Not Load Lazy Properties
In a nutshell: Entity Framework Code First (EFCF) validation does not load lazy properties. If any of these properties is marked as required, and it is not loaded, a validation error will occur.