What is Thread.CurrentPrincipal used for? How does it help in the Authentication and Authorization of an application? Are there any articles or resources that help explain what it does?
What is Thread.CurrentPrincipal, and what does it do?
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Thread.CurrentPrincipalis the way .NET applications represent the identity of the user or service account running the process.It can hold one or more identities and allows the application to check if the principal is in a role through the
IsInRolemethod.Most authentication libraries in .NET will verify the user's credentials and set this static property on the Thread class to a new principal object.
Different threads can have different principals as they may be handling requests from different users (in ASP.NET web applications
HttpContext.Useris copied intoThread.CurrentPrincipalfor each new request)Since .NET 4.5, all principal classes derive from
ClaimsPrincipal, enabling claims based authentication.UPDATE: This is what a WindowsPrincipal looks like on my dev box: