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SecurityTokenAuthenticator.ValidateToken Method

Authenticates the specified security token and returns the set of authorization policies for the security token.

Namespace:  System.IdentityModel.Selectors
Assembly:  System.IdentityModel (in System.IdentityModel.dll)

public ReadOnlyCollection<IAuthorizationPolicy> ValidateToken(
	SecurityToken token


Type: System.IdentityModel.Tokens.SecurityToken

The SecurityToken to be validated.

Return Value

Type: System.Collections.ObjectModel.ReadOnlyCollection<IAuthorizationPolicy>
A ReadOnlyCollection<T> of type IAuthorizationPolicy that contains the set of authorization policies in effect for this application.


token is null.


token cannot be authenticated by this security token authenticator


token is not authenticated.

The ValidateToken method checks whether the token parameter is null, calls the CanValidateToken method to determine if this security token authenticator can authenticate this security token, and then if it can, calls the ValidateTokenCore method.

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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