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Asked: 2026-05-24T02:44:06+00:00

I’m writing a social networking application in VB.NET, with a target userbase of 1-2

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I’m writing a social networking application in VB.NET, with a target userbase of 1-2 million users.

All user data will be in memory in a dictionary of ‘User’ objects with properties such as Country, Region, Age etc exposed. I need to perform search against multiple user properties in memory – I’m not using SQL.

What’s the most performant way to implement a ‘user search’ against multiple properties?

Additional Info
I’m currently using UserID as the Key for the Dictionary, which is fine as most of the (non-search) lookups will be via UserID. I am considering using multiple Dictionaries as indexes using other User properties as keys, would this be workable? I’m really just trying to avoid an exhaustive itterative search of all users.

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1 Answer

  1. Editorial Team

    Probably LINQ to Objects, but I would use multiple dictionary lists if you’re planning on a million users, especially if the properties of the User objects are able to change. (For example, all of the Users who’s UserName starts with A go into one list, B-C into another, etc.)

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