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What is ModelState and why is it crucial?

Mid .NET Core
Quick Answer ModelState is a dictionary of property names to validation states populated after model binding. It tracks which fields have errors and what those errors are. ModelState.IsValid tells you if all validations passed. In Razor views, asp-validation-for and validation summary tag helpers display ModelState errors next to the relevant fields.

Answer

ModelState is a dictionary that stores the results of model binding and validation.

  • It tracks whether binding succeeded for each field.
  • It collects validation errors and messages.
  • ModelState.IsValid indicates whether the model is safe to use.

Actions should check ModelState to avoid operating on invalid data and to return meaningful error messages to clients.

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