RequiresAuthenticationAttribute Class

Artigo
01/27/2012

[WCF RIA Services Version 1 Service Pack 2 is compatible with either .NET framework 4 or .NET Framework 4.5, and with either Silverlight 4 or Silverlight 5.]

Specifies that a domain operation can only be invoked by an authenticated user.

Inheritance Hierarchy

System.Object
  System.Attribute
    System.ComponentModel.DataAnnotations.AuthorizationAttribute
      System.ServiceModel.DomainServices.Server.RequiresAuthenticationAttribute

Namespace: System.ServiceModel.DomainServices.Server
Assembly: System.ServiceModel.DomainServices.Server (in System.ServiceModel.DomainServices.Server.dll)

Syntax

'Declaration
<AttributeUsageAttribute(AttributeTargets.Class Or AttributeTargets.Method Or AttributeTargets.Property Or AttributeTargets.Field, AllowMultiple := False,  _
    Inherited := True)> _
Public NotInheritable Class RequiresAuthenticationAttribute _
    Inherits AuthorizationAttribute

'Usage
Dim instance As RequiresAuthenticationAttribute

[AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = false, 
    Inherited = true)]
public sealed class RequiresAuthenticationAttribute : AuthorizationAttribute

[AttributeUsageAttribute(AttributeTargets::Class|AttributeTargets::Method|AttributeTargets::Property|AttributeTargets::Field, AllowMultiple = false, 
    Inherited = true)]
public ref class RequiresAuthenticationAttribute sealed : public AuthorizationAttribute

[<SealedAttribute>]
[<AttributeUsageAttribute(AttributeTargets.Class|AttributeTargets.Method|AttributeTargets.Property|AttributeTargets.Field, AllowMultiple = false, 
    Inherited = true)>]
type RequiresAuthenticationAttribute =  
    class
        inherit AuthorizationAttribute
    end

public final class RequiresAuthenticationAttribute extends AuthorizationAttribute

The RequiresAuthenticationAttribute type exposes the following members.

Constructors

	Name	Description
	RequiresAuthenticationAttribute	Initializes a new instance of the RequiresAuthenticationAttribute class.

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Properties

	Name	Description
	ErrorMessage	Gets or sets the literal error message or resource key intended to be returned in an ErrorMessage. (Inherited from AuthorizationAttribute.)
	ResourceType	Gets or sets the Type to use as the resource manager for ErrorMessage. (Inherited from AuthorizationAttribute.)
	TypeId	(Inherited from Attribute.)

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Methods

	Name	Description
	Authorize	Determines whether the given principal object is authorized to perform a specific operation described by the given AuthorizationContext. (Inherited from AuthorizationAttribute.)
	Equals	(Inherited from Attribute.)
	Finalize	(Inherited from Object.)
	FormatErrorMessage	Gets the formatted error message for the current AuthorizationAttribute to present to the user. (Inherited from AuthorizationAttribute.)
	GetHashCode	(Inherited from Attribute.)
	GetType	(Inherited from Object.)
	IsAuthorized	Implementation specific method to determine whether the given IPrincipal object is authorized to perform a specific operation described by the given AuthorizationContext object. (Inherited from AuthorizationAttribute.)
	IsDefaultAttribute	(Inherited from Attribute.)
	Match	(Inherited from Attribute.)
	MemberwiseClone	(Inherited from Object.)
	ToString	(Inherited from Object.)

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Explicit Interface Implementations

	Name	Description
	_Attribute.GetIDsOfNames	(Inherited from Attribute.)
	_Attribute.GetTypeInfo	(Inherited from Attribute.)
	_Attribute.GetTypeInfoCount	(Inherited from Attribute.)
	_Attribute.Invoke	(Inherited from Attribute.)

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Remarks

You apply the RequiresAuthenticationAttribute attribute to a domain method to restrict access to the operation to only authenticated users. When you apply the RequiresAuthenticationAttribute attribute to an entire domain service class, all of the domain operations are restricted to only authenticated users. The RequiresAuthenticationAttribute attribute prevents the method from being executed when the user is not authenticated. If you call a domain operation when the user is not authenticated, the domain operation returns an exception. You can avoid this situation by checking the IsAuthenticated property on the User object generated in the client project before calling the domain operation.

RIA Services also provides the RequiresRoleAttribute attribute to indicate that the user must belong to specified role or roles. You can also provide customized authorization requirements by implementing a class that derives from the AuthorizationAttribute and overriding the IsAuthorized method. For more information, see How to: Create a Custom Authorization Attribute.

Examples

The following example shows a domain service with the RequiresAuthenticationAttribute attribute applied to the GetSalesOrderHeader method.

<EnableClientAccess()>  _
Public Class AdventureWorksDomainService
    Inherits LinqToEntitiesDomainService(Of AdventureWorksLT_DataEntities)

    <RequiresRole("Managers")> _
    Public Function GetCustomers() As IQueryable(Of Customer)
        Return Me.ObjectContext.Customers
    End Function

    Public Function GetProducts() As IQueryable(Of Product)
        Return Me.ObjectContext.Products
    End Function

    <RequiresAuthentication()> _
    Public Function GetSalesOrderHeaders() As IQueryable(Of SalesOrderHeader)
        Return Me.ObjectContext.SalesOrderHeaders
    End Function
End Class

[EnableClientAccess()]
public class AdventureWorksDomainService : LinqToEntitiesDomainService<AdventureWorksLT_DataEntities>
{
    [RequiresRole("Managers")]
    public IQueryable<Customer> GetCustomers()
    {
        return this.ObjectContext.Customers;
    }

    public IQueryable<Product> GetProducts()
    {
        return this.ObjectContext.Products;
    }

    [RequiresAuthentication()]
    public IQueryable<SalesOrderHeader> GetSalesOrderHeaders()
    {
        return this.ObjectContext.SalesOrderHeaders;
    }
}

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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