regex

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

C# – Remove non-alphanumeric characters from a string

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The simplest way to remove non-alphanumeric characters from a string is to use regex: Note: Don’t pass in a null, otherwise you’ll get an exception. Regex is the simplest options for removing characters by “category” (as opposed to removing arbitrary lists of characters or removing characters by position). The downside is that regex is the … Read more

C# – Use StringAssert when testing a string for substrings

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When you’re testing if two strings are equal, you can simply use Assert.AreEqual(). When you’re testing if a string contains a substring or a pattern, typically developers use Assert.IsTrue() with a substring method or regex. You should use StringAssert instead, because it gives better failure messages. Note: StringAssert is nice because it’s a built-in class. … Read more

C# – How to create a custom exception

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To create a custom exception, create a subclass of the Exception class, like this: Then throw it just like you would any other exception, like this: It’s a good idea to call the base constructor from your constructor and pass in your custom error message. If this exception is unhandled, or if you are logging … Read more