AspNetCore.Docs/aspnetcore/includes/bind-get.md

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[!WARNING] For security reasons, you must opt in to binding GET request data to page model properties. Verify user input before mapping it to properties. Opting into GET binding is useful when addressing scenarios that rely on query string or route values.

To bind a property on GET requests, set the [BindProperty] attribute's SupportsGet property to true:

[BindProperty(SupportsGet = true)]

For more information, see ASP.NET Core Community Standup: Bind on GET discussion (YouTube).