This comes up quite often in my work where I want to check if a value from one list is in another list.

Perhaps you need to check if a user has a permission do do something.

You have a list of the user's roles and you have a list of roles that are allowed to do the thing. With the code below, you can pass in the two lists and get a true or false answer back for if there was a match.

public static bool ListsContainAMatchingValue(IEnumerable<string> listA, IEnumerable<string> listB)
return listA.Any(x => listB.Contains(x));

Feel free to use this code, and share with others. If you have an alternative suggestion, please leave it in the comments.

Paul Seal

Umbraco MVP and .NET Web Developer from Derby (UK) who specialises in building Content Management System (CMS) websites using MVC with Umbraco as a framework. Paul is passionate about web development and programming as a whole. Apart from when he's with his wife and son, if he's not writing code, he's thinking about it or listening to a podcast about it.

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