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WebPermissionAttribute Class

.NET Framework 4

Specifies permission to access Internet resources. This class cannot be inherited.

System.Object
  System.Attribute
    System.Security.Permissions.SecurityAttribute
      System.Security.Permissions.CodeAccessSecurityAttribute
        System.Net.WebPermissionAttribute

Namespace:  System.Net
Assembly:  System (in System.dll)
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[SerializableAttribute]
[AttributeUsageAttribute(AttributeTargets.Assembly|AttributeTargets.Class|AttributeTargets.Struct|AttributeTargets.Constructor|AttributeTargets.Method, AllowMultiple = true, 
	Inherited = false)]
public sealed class WebPermissionAttribute : CodeAccessSecurityAttribute

The WebPermissionAttribute type exposes the following members.

  Name Description
Public method WebPermissionAttribute Initializes a new instance of the WebPermissionAttribute class with a value that specifies the security actions that can be performed on this class.
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  Name Description
Public property Accept Gets or sets the URI string accepted by the current WebPermissionAttribute.
Public property AcceptPattern Gets or sets a regular expression pattern that describes the URI accepted by the current WebPermissionAttribute.
Public property Action Gets or sets a security action. (Inherited from SecurityAttribute.)
Public property Connect Gets or sets the URI connection string controlled by the current WebPermissionAttribute.
Public property ConnectPattern Gets or sets a regular expression pattern that describes the URI connection controlled by the current WebPermissionAttribute.
Public property TypeId When implemented in a derived class, gets a unique identifier for this Attribute. (Inherited from Attribute.)
Public property Unrestricted Gets or sets a value indicating whether full (unrestricted) permission to the resource protected by the attribute is declared. (Inherited from SecurityAttribute.)
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  Name Description
Public method CreatePermission Creates and returns a new instance of the WebPermission class. (Overrides SecurityAttribute.CreatePermission().)
Public method Equals Infrastructure. Returns a value that indicates whether this instance is equal to a specified object. (Inherited from Attribute.)
Protected method Finalize Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method GetHashCode Returns the hash code for this instance. (Inherited from Attribute.)
Public method GetType Gets the Type of the current instance. (Inherited from Object.)
Public method IsDefaultAttribute When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class. (Inherited from Attribute.)
Public method Match When overridden in a derived class, returns a value that indicates whether this instance equals a specified object. (Inherited from Attribute.)
Protected method MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public method ToString Returns a string that represents the current object. (Inherited from Object.)
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  Name Description
Explicit interface implemetation Private method _Attribute.GetIDsOfNames Maps a set of names to a corresponding set of dispatch identifiers. (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.GetTypeInfo Retrieves the type information for an object, which can be used to get the type information for an interface. (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.GetTypeInfoCount Retrieves the number of type information interfaces that an object provides (either 0 or 1). (Inherited from Attribute.)
Explicit interface implemetation Private method _Attribute.Invoke Provides access to properties and methods exposed by an object. (Inherited from Attribute.)
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WebPermissionAttribute allows you to declaratively specify which URI strings and regular expression strings your class can use.

The security information specified in the WebPermissionAttribute is stored in the metadata of the attribute target, which is the class to which WebPermissionAttribute is applied. The system accesses this information at run time. The System.Security.Permissions.SecurityAction passed to the constructor determines the allowable WebPermissionAttribute targets. The system uses the WebPermission returned by the CreatePermission method to convert the security information of the attribute target to a serializable form stored in metadata.

Note Note

WebPermissionAttribute is used only for Declarative Security. For Imperative Security, use the corresponding WebPermission.

The following example demonstrates how to apply WebPermissionAttribute to a method.

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	// Deny access to a specific resource by setting the ConnectPattern property. 
   [WebPermission(SecurityAction.Deny, ConnectPattern=@"http://www\.contoso\.com/")]

public void Connect() 
     {
        // Create a Connection.  
        HttpWebRequest myWebRequest = (HttpWebRequest)WebRequest.Create("http://www.contoso.com");
        Console.WriteLine("This line should never be printed");
     }

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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