PrincipalPermissionAttribute Class
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PrincipalPermissionAttribute Class


Allows security actions for PrincipalPermission to be applied to code using declarative security. This class cannot be inherited.

Namespace:   System.Security.Permissions
Assembly:  mscorlib (in mscorlib.dll)

[AttributeUsageAttribute(AttributeTargets.Class | AttributeTargets.Method, 
	AllowMultiple = true, Inherited = false)]
public sealed class PrincipalPermissionAttribute : CodeAccessSecurityAttribute


Initializes a new instance of the PrincipalPermissionAttribute class with the specified SecurityAction.


Gets or sets a security action.(Inherited from SecurityAttribute.)


Gets or sets a value indicating whether the current principal has been authenticated by the underlying role-based security provider.


Gets or sets the name of the identity associated with the current principal.


Gets or sets membership in a specified security role.


When implemented in a derived class, gets a unique identifier for this Attribute.(Inherited from Attribute.)


Gets or sets a value indicating whether full (unrestricted) permission to the resource protected by the attribute is declared.(Inherited from SecurityAttribute.)


Creates and returns a new PrincipalPermission.(Overrides SecurityAttribute.CreatePermission().)


This API supports the product infrastructure and is not intended to be used directly from your code. Returns a value that indicates whether this instance is equal to a specified object.(Inherited from Attribute.)


Returns the hash code for this instance.(Inherited from Attribute.)


Gets the Type of the current instance.(Inherited from Object.)


When overridden in a derived class, indicates whether the value of this instance is the default value for the derived class.(Inherited from Attribute.)


When overridden in a derived class, returns a value that indicates whether this instance equals a specified object.(Inherited from Attribute.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetIDsOfNames(Guid, IntPtr, UInt32, UInt32, IntPtr)

Maps a set of names to a corresponding set of dispatch identifiers.(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.GetTypeInfo(UInt32, UInt32, IntPtr)

Retrieves the type information for an object, which can be used to get the type information for an interface.(Inherited from Attribute.)


Retrieves the number of type information interfaces that an object provides (either 0 or 1).(Inherited from Attribute.)

System_CAPS_pubinterfaceSystem_CAPS_privmethod_Attribute.Invoke(UInt32, Guid, UInt32, Int16, IntPtr, IntPtr, IntPtr, IntPtr)

Provides access to properties and methods exposed by an object.(Inherited from Attribute.)

PrincipalPermissionAttribute can be used to declaratively demand that users running your code belong to a specified role or have been authenticated. Use of Unrestricted creates a PrincipalPermission with Authenticated set to true and Name and Role set to null.

The scope of the declaration that is allowed depends on the SecurityAction that is used. PrincipalPermissionAttribute cannot be applied at the assembly level.

The security information declared by a security attribute is stored in the metadata of the attribute target and is accessed by the system at run time. Security attributes are used only for declarative security. For imperative security, use the corresponding permission class.


Before you use this class to demand principal permission, you must set the current application domain's principal policy to the enumeration value WindowsPrincipal. By default, the principal policy is set to UnauthenticatedPrincipal. If you do not set the principal policy to WindowsPrincipal, a demand for principal permission will fail. The following code should be executed before the principal permission is demanded: AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal).

Legacy Code Example

The following example demonstrates how the PrincipalPermissionAttribute class is used declaratively to demand that the current user be an administrator.


In Windows Vista, User Account Control (UAC) determines the privileges of a user. If you are a member of the Built-in Administrators group, you are assigned two run-time access tokens: a standard user access token and an administrator access token. By default, you are in the standard user role. To execute the code that requires you to be an administrator, you must first elevate your privileges from standard user to administrator. You can do this when you start an application by right-clicking the application icon and indicating that you want to run as an administrator.

private static void DemonstrateReadWriteXMLSchemaWithReader()
    DataTable table = CreateTestTable("XmlDemo");
    PrintSchema(table, "Original table");

    // Write the schema to XML in a memory stream.
    System.IO.MemoryStream xmlStream = new System.IO.MemoryStream();

    // Rewind the memory stream.
    xmlStream.Position = 0;

    DataTable newTable = new DataTable();
    System.IO.StreamReader reader = 
        new System.IO.StreamReader(xmlStream);

    // Print out values in the table.
    PrintSchema(newTable, "New table");

private static DataTable CreateTestTable(string tableName)
    // Create a test DataTable with two columns and a few rows.
    DataTable table = new DataTable(tableName);
    DataColumn column = new DataColumn("id", typeof(System.Int32));
    column.AutoIncrement = true;

    column = new DataColumn("item", typeof(System.String));

    // Add ten rows.
    DataRow row;
    for (int i = 0; i <= 9; i++)
        row = table.NewRow();
        row["item"] = "item " + i;

    return table;

private static void PrintSchema(DataTable table, string label)
    // Display the schema of the supplied DataTable:
    foreach (DataColumn column in table.Columns)
        Console.WriteLine("\t{0}: {1}", 
            column.ColumnName, column.DataType.Name);

.NET Framework
Available since 1.1

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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