DnsPermission Constructor
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DnsPermission Constructor (PermissionState)

 

Creates a new instance of the DnsPermission class that either allows unrestricted DNS access or disallows DNS access.

Namespace:   System.Net
Assembly:  System (in System.dll)

Public Sub New (
	state As PermissionState
)

Parameters

state
Type: System.Security.Permissions.PermissionState

One of the PermissionState values.

Exception Condition
ArgumentException

state is not a valid PermissionState value.

If state is Unrestricted, the DnsPermission instance passes all demands. If state contains any other value, the DnsPermission instance fails all demands.

The following example creates an instance of the DnsPermission class.

Public Sub useDns()
    ' Create a DnsPermission instance.
    Dim permission As New DnsPermission(PermissionState.Unrestricted)

    ' Check for permission.
    permission.Demand()
    ' Create a SecurityElement object to hold XML encoding of the DnsPermission instance.
    Dim securityElementObj As SecurityElement = permission.ToXml()
    Console.WriteLine("Tag, Attributes and Values of 'DnsPermission' instance :")
    Console.WriteLine((ControlChars.Cr + ControlChars.Tab + "Tag :" + securityElementObj.Tag))
    ' Print the attributes and values.
    PrintKeysAndValues(securityElementObj.Attributes)
End Sub 'useDns

Private Sub PrintKeysAndValues(myList As Hashtable)
    ' Get the enumerator that can iterate through the hash table.
    Dim myEnumerator As IDictionaryEnumerator = myList.GetEnumerator()
    Console.WriteLine(ControlChars.Cr + ControlChars.Tab + "-KEY-" + ControlChars.Tab + "-VALUE-")
    While myEnumerator.MoveNext()
        Console.WriteLine(ControlChars.Tab + "{0}:" + ControlChars.Tab + "{1}", myEnumerator.Key, myEnumerator.Value)
    End While
    Console.WriteLine()
End Sub 'PrintKeysAndValues

.NET Framework
Available since 1.1
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