What is a good design when trying to build objects from a list of key value pairs?

Take a deep look at the XmlSerializer . Even if you are constrained to not use XML on-disk, you might want to copy some of its features. This could then look like this.

Making a lot of unwarranted assumptions, I think that the best approach would be to create a Factory that will receive the list of key value pairs and return the proper object or throw an exception if it's invalid (or create a dummy object, or whatever is better in the particular case).

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