SecurityElement-Klasse
Stellt das XML-Objektmodell zum Codieren von Sicherheitsobjekten dar. Diese Klasse kann nicht vererbt werden.
Namespace: System.Security
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
<SerializableAttribute> _
<ComVisibleAttribute(True)> _
Public NotInheritable Class SecurityElement
'Usage
Dim instance As SecurityElement
[SerializableAttribute]
[ComVisibleAttribute(true)]
public sealed class SecurityElement
[SerializableAttribute]
[ComVisibleAttribute(true)]
public ref class SecurityElement sealed
/** @attribute SerializableAttribute() */
/** @attribute ComVisibleAttribute(true) */
public final class SecurityElement
SerializableAttribute
ComVisibleAttribute(true)
public final class SecurityElement
Hinweise
Diese Klasse wurde als schlanke Implementierung eines einfachen XML-Objektmodells entwickelt, die im Sicherheitssystem verwendet wird, und nicht als allgemeines XML-Objektmodell. Diese Dokumentation setzt Grundkenntnisse über XML voraus.
Das einfache XML-Objektmodell für ein Element setzt sich aus folgenden Bestandteilen zusammen:
Das Tag ist der Elementname.
Die Attribute sind 0 (null) oder mehr Attributpaare aus Name und Wert für das Element.
Die untergeordneten Elemente sind 0 (null) oder mehr geschachtelte Elemente in
<tag>und</tag>.
Es wird ausdrücklich empfohlen, dass Sicherheitselemente und die dazugehörenden Werte mit einer XML-Darstellung auf Attributbasis ausgedrückt werden. Dies bedeutet, dass Eigenschaften eines Elements als Attribute und Eigenschaftenwerte als Attributwerte ausgedrückt werden. Vermeiden Sie die Schachtelung von Text zwischen Tags. Für jede <tag>text</tag>-Darstellung ist i. d. R. eine Darstellung vom Typ <tag value=”text”/> verfügbar. Die Verwendung dieser XML-Darstellung Attributbasis verbessert die Lesbarkeit und ermöglicht eine einfache WMI-Portabilität der entstandenen XML-Serialisierung.
Ein Attributname muss eine Mindestlänge von einem Zeichen aufweisen und darf nicht NULL (Nothing in Visual Basic) sein. Wenn die Wertdarstellung auf Elementbasis verwendet wird, werden Elemente mit einer Textzeichenfolge von NULL (Nothing in Visual Basic) in der Form <tag/> dargestellt. Andernfalls wird Text durch das <tag>-Token und das </tag>-Token getrennt. Beide Formen können mit Attributen kombiniert werden, die dann ggf. angezeigt werden.
Bei Tags, Attributen und Text von Elementen wird, sofern vorhanden, die Groß- und Kleinschreibung immer berücksichtigt. Die XML-Form enthält an den erforderlichen Stellen Anführungszeichen und Escapezeichen. Wenn Zeichenfolgenwerte Zeichen enthalten, die für XML ungültig sind, wird eine ArgumentException ausgelöst. Diese Regeln gelten für alle Eigenschaften und Methoden.
Hinweis
Aus Leistungsgründen wird die Gültigkeit von Zeichen nur bei in XML-Textform codierten Elementen und nicht bei jedem Festlegen einer Eigenschaft oder Methode überprüft. Statische Methoden ermöglichen eine explizite Überprüfung bei Bedarf.
Beispiel
Im folgenden Beispiel wird die Verwendung von Membern der SecurityElement-Klasse veranschaulicht.
Imports System
Imports System.Security
Imports System.Collections
Class SecurityElementMembers
<STAThread()> _
Shared Sub Main(ByVal args() As String)
Dim xmlRootElement As New SecurityElement("RootTag", "XML security tree")
AddAttribute(xmlRootElement, "creationdate", DateTime.Now.ToString())
AddChildElement(xmlRootElement, "destroytime", DateTime.Now.AddSeconds(1.0).ToString())
Dim windowsRoleElement As New SecurityElement("WindowsMembership.WindowsRole")
windowsRoleElement.AddAttribute("version", "1.00")
' Add a child element and a creationdate attribute.
AddChildElement(windowsRoleElement, "BabyElement", "This is a child element")
AddAttribute(windowsRoleElement, "creationdate", DateTime.Now.ToString())
xmlRootElement.AddChild(windowsRoleElement)
CompareAttributes(xmlRootElement, "creationdate")
ConvertToHashTable(xmlRootElement)
DisplaySummary(xmlRootElement)
' Determine if the security element is too old to keep.
xmlRootElement = DestroyTree(xmlRootElement)
If Not (xmlRootElement Is Nothing) Then
Dim elementInXml As String = xmlRootElement.ToString()
Console.WriteLine(elementInXml)
End If
Console.WriteLine("This sample completed successfully; " + "press Enter to exit.")
Console.ReadLine()
End Sub 'Main
' Add an attribute to the specified security element.
Private Shared Function AddAttribute(ByVal xmlElement As SecurityElement, ByVal attributeName As String, ByVal attributeValue As String) As SecurityElement
If Not (xmlElement Is Nothing) Then
' Verify that the attribute name and value are valid XML formats.
If SecurityElement.IsValidAttributeName(attributeName) AndAlso SecurityElement.IsValidAttributeValue(attributeValue) Then
' Add the attribute to the security element.
xmlElement.AddAttribute(attributeName, attributeValue)
End If
Return xmlElement
End Function 'AddAttribute
' Add a child element to the specified security element.
Private Shared Function AddChildElement(ByVal parentElement As SecurityElement, ByVal tagName As String, ByVal tagText As String) As SecurityElement
If Not (parentElement Is Nothing) Then
' Ensure that the tag text is in valid XML format.
If Not SecurityElement.IsValidText(tagText) Then
' Replace invalid text with valid XML text
' to enforce proper XML formatting.
tagText = SecurityElement.Escape(tagText)
' Determine whether the tag is in valid XML format.
If SecurityElement.IsValidTag(tagName) Then
Dim childElement As SecurityElement
childElement = parentElement.SearchForChildByTag(tagName)
If Not (childElement Is Nothing) Then
Dim elementText As String
elementText = parentElement.SearchForTextOfTag(tagName)
If Not elementText.Equals(tagText) Then
' Add child element to the parent security element.
parentElement.AddChild(New SecurityElement(tagName, tagText))
End If
Else
' Add child element to the parent security element.
parentElement.AddChild(New SecurityElement(tagName, tagText))
End If
End If
End If
Return parentElement
End Function 'AddChildElement
' Create and display a summary sentence
' about the specified security element.
Private Shared Sub DisplaySummary(ByVal xmlElement As SecurityElement)
' Retrieve tag name for the security element.
Dim xmlTreeName As String = xmlElement.Tag.ToString()
' Retrieve tag text for the security element.
Dim xmlTreeDescription As String = xmlElement.Text
' Retrieve value of the creationdate attribute.
Dim xmlCreationDate As String = xmlElement.Attribute("creationdate")
' Retrieve the number of children under the security element.
Dim childrenCount As String = xmlElement.Children.Count.ToString()
Dim outputMessage As String = "The security XML tree named " + xmlTreeName
outputMessage += "(" + xmlTreeDescription + ")"
outputMessage += " was created on " + xmlCreationDate + " and "
outputMessage += "contains " + childrenCount + " child elements."
Console.WriteLine(outputMessage)
End Sub 'DisplaySummary
' Compare the first two occurrences of an attribute
' in the specified security element.
Private Shared Sub CompareAttributes(ByVal xmlElement As SecurityElement, ByVal attributeName As String)
' Create a hash table containing the security element's attributes.
Dim attributeKeys As Hashtable = xmlElement.Attributes
Dim attributeValue As String = attributeKeys(attributeName).ToString()
Dim xmlChild As SecurityElement
For Each xmlChild In xmlElement.Children
If attributeValue.Equals(xmlChild.Attribute(attributeName)) Then
End If
Next xmlChild
' The security elements were created at the exact same time.
End Sub 'CompareAttributes
' Convert the contents of the specified security element
' to hash codes stored in a hash table.
Private Shared Sub ConvertToHashTable(ByVal xmlElement As SecurityElement)
' Create a hash table to hold hash codes of the security elements.
Dim xmlAsHash As New Hashtable()
Dim rootIndex As Integer = xmlElement.GetHashCode()
xmlAsHash.Add(rootIndex, "root")
Dim parentNum As Integer = 0
Dim xmlParent As SecurityElement
For Each xmlParent In xmlElement.Children
parentNum += 1
xmlAsHash.Add(xmlParent.GetHashCode(), "parent" + parentNum.ToString())
If Not (xmlParent.Children Is Nothing) AndAlso xmlParent.Children.Count > 0 Then
Dim childNum As Integer = 0
Dim xmlChild As SecurityElement
For Each xmlChild In xmlParent.Children
childNum += 1
xmlAsHash.Add(xmlChild.GetHashCode(), "child" + childNum.ToString())
Next xmlChild
End If
Next xmlParent
End Sub 'ConvertToHashTable
' Delete the specified security element if the current time is past
' the time stored in the destroytime tag.
Private Shared Function DestroyTree(ByVal xmlElement As SecurityElement) As SecurityElement
Dim localXmlElement As SecurityElement = xmlElement
Dim destroyElement As SecurityElement = localXmlElement.SearchForChildByTag("destroytime")
' Verify that a destroytime tag exists.
If Not (localXmlElement.SearchForChildByTag("destroytime") Is Nothing) Then
' Retrieve the destroytime text to get the time
' the tree can be destroyed.
Dim storedDestroyTime As String = localXmlElement.SearchForTextOfTag("destroytime")
Dim destroyTime As DateTime = DateTime.Parse(storedDestroyTime)
If DateTime.Now > destroyTime Then
localXmlElement = Nothing
Console.WriteLine("The XML security tree has been deleted.")
End If
End If
' Verify that xmlElement is of type SecurityElement.
If xmlElement.GetType().Equals(GetType(System.Security.SecurityElement)) Then
' Determine whether the localXmlElement object
' differs from xmlElement.
If xmlElement.Equals(localXmlElement) Then
' Verify that the tags, attributes and children of the
' two security elements are identical.
If xmlElement.Equal(localXmlElement) Then
' Return the original security element.
Return xmlElement
End If
End If
End If
' Return the modified security element.
Return localXmlElement
End Function 'DestroyTree
End Class 'SecurityElementMembers
'
' This sample produces the following output:
'
' The security XML tree named RootTag(XML security tree)
' was created on 2/23/2004 1:23:00 PM and contains 2 child elements.
'<RootTag creationdate="2/23/2004 1:23:00 PM">XML security tree
' <destroytime>2/23/2004 1:23:01 PM</destroytime>
' <WindowsMembership.WindowsRole version="1.00"
' creationdate="2/23/2004 1:23:00 PM">
' <BabyElement>This is a child element.</BabyElement>
' </WindowsMembership.WindowsRole>
'</RootTag>
'
'This sample completed successfully; press Exit to continue.
using System;
using System.Security;
using System.Collections;
class SecurityElementMembers
{
[STAThread]
static void Main(string[] args)
{
SecurityElement xmlRootElement =
new SecurityElement("RootTag", "XML security tree");
AddAttribute(xmlRootElement,"creationdate",DateTime.Now.ToString());
AddChildElement(xmlRootElement,"destroytime",
DateTime.Now.AddSeconds(1.0).ToString());
SecurityElement windowsRoleElement =
new SecurityElement("WindowsMembership.WindowsRole");
windowsRoleElement.AddAttribute("version","1.00");
// Add a child element and a creationdate attribute.
AddChildElement(windowsRoleElement,"BabyElement",
"This is a child element");
AddAttribute(windowsRoleElement,"creationdate",
DateTime.Now.ToString());
xmlRootElement.AddChild(windowsRoleElement);
CompareAttributes(xmlRootElement, "creationdate");
ConvertToHashTable(xmlRootElement);
DisplaySummary(xmlRootElement);
// Determine if the security element is too old to keep.
xmlRootElement = DestroyTree(xmlRootElement);
if (xmlRootElement != null)
{
string elementInXml = xmlRootElement.ToString();
Console.WriteLine(elementInXml);
}
Console.WriteLine("This sample completed successfully; " +
"press Enter to exit.");
Console.ReadLine();
}
// Add an attribute to the specified security element.
private static SecurityElement AddAttribute(
SecurityElement xmlElement,
string attributeName,
string attributeValue)
{
if (xmlElement != null)
{
// Verify that the attribute name and value are valid XML formats.
if (SecurityElement.IsValidAttributeName(attributeName) &&
SecurityElement.IsValidAttributeValue(attributeValue))
{
// Add the attribute to the security element.
xmlElement.AddAttribute(attributeName, attributeValue);
}
}
return xmlElement;
}
// Add a child element to the specified security element.
private static SecurityElement AddChildElement(
SecurityElement parentElement,
string tagName,
string tagText)
{
if (parentElement != null)
{
// Ensure that the tag text is in valid XML format.
if (!SecurityElement.IsValidText(tagText))
{
// Replace invalid text with valid XML text
// to enforce proper XML formatting.
tagText = SecurityElement.Escape(tagText);
}
// Determine whether the tag is in valid XML format.
if (SecurityElement.IsValidTag(tagName))
{
SecurityElement childElement;
childElement = parentElement.SearchForChildByTag(tagName);
if (childElement != null)
{
String elementText;
elementText = parentElement.SearchForTextOfTag(tagName);
if (!elementText.Equals(tagText))
{
// Add child element to the parent security element.
parentElement.AddChild(
new SecurityElement(tagName, tagText));
}
}
else
{
// Add child element to the parent security element.
parentElement.AddChild(
new SecurityElement(tagName, tagText));
}
}
}
return parentElement;
}
// Create and display a summary sentence
// about the specified security element.
private static void DisplaySummary(SecurityElement xmlElement)
{
// Retrieve tag name for the security element.
string xmlTreeName = xmlElement.Tag.ToString();
// Retrieve tag text for the security element.
string xmlTreeDescription = xmlElement.Text;
// Retrieve value of the creationdate attribute.
string xmlCreationDate = xmlElement.Attribute("creationdate");
// Retrieve the number of children under the security element.
string childrenCount = xmlElement.Children.Count.ToString();
string outputMessage = "The security XML tree named " + xmlTreeName;
outputMessage += "(" + xmlTreeDescription + ")";
outputMessage += " was created on " + xmlCreationDate + " and ";
outputMessage += "contains " + childrenCount + " child elements.";
Console.WriteLine(outputMessage);
}
// Compare the first two occurrences of an attribute
// in the specified security element.
private static void CompareAttributes(
SecurityElement xmlElement, string attributeName)
{
// Create a hash table containing the security element's attributes.
Hashtable attributeKeys = xmlElement.Attributes;
string attributeValue = attributeKeys[attributeName].ToString();
foreach(SecurityElement xmlChild in xmlElement.Children)
{
if (attributeValue.Equals(xmlChild.Attribute(attributeName)))
{
// The security elements were created at the exact same time.
}
}
}
// Convert the contents of the specified security element
// to hash codes stored in a hash table.
private static void ConvertToHashTable(SecurityElement xmlElement)
{
// Create a hash table to hold hash codes of the security elements.
Hashtable xmlAsHash = new Hashtable();
int rootIndex = xmlElement.GetHashCode();
xmlAsHash.Add(rootIndex, "root");
int parentNum = 0;
foreach(SecurityElement xmlParent in xmlElement.Children)
{
parentNum++;
xmlAsHash.Add(xmlParent.GetHashCode(), "parent" + parentNum);
if ((xmlParent.Children != null) &&
(xmlParent.Children.Count > 0))
{
int childNum = 0;
foreach(SecurityElement xmlChild in xmlParent.Children)
{
childNum++;
xmlAsHash.Add(xmlChild.GetHashCode(), "child" + childNum);
}
}
}
}
// Delete the specified security element if the current time is past
// the time stored in the destroytime tag.
private static SecurityElement DestroyTree(SecurityElement xmlElement)
{
SecurityElement localXmlElement = xmlElement;
SecurityElement destroyElement =
localXmlElement.SearchForChildByTag("destroytime");
// Verify that a destroytime tag exists.
if (localXmlElement.SearchForChildByTag("destroytime") != null)
{
// Retrieve the destroytime text to get the time
// the tree can be destroyed.
string storedDestroyTime =
localXmlElement.SearchForTextOfTag("destroytime");
DateTime destroyTime = DateTime.Parse(storedDestroyTime);
if (DateTime.Now > destroyTime)
{
localXmlElement = null;
Console.WriteLine("The XML security tree has been deleted.");
}
}
// Verify that xmlElement is of type SecurityElement.
if (xmlElement.GetType().Equals(
typeof(System.Security.SecurityElement)))
{
// Determine whether the localXmlElement object
// differs from xmlElement.
if (xmlElement.Equals(localXmlElement))
{
// Verify that the tags, attributes and children of the
// two security elements are identical.
if (xmlElement.Equal(localXmlElement))
{
// Return the original security element.
return xmlElement;
}
}
}
// Return the modified security element.
return localXmlElement;
}
}
//
// This sample produces the following output:
//
// The security XML tree named RootTag(XML security tree)
// was created on 2/23/2004 1:23:00 PM and contains 2 child elements.
//<RootTag creationdate="2/23/2004 1:23:00 PM">XML security tree
// <destroytime>2/23/2004 1:23:01 PM</destroytime>
// <WindowsMembership.WindowsRole version="1.00"
// creationdate="2/23/2004 1:23:00 PM">
// <BabyElement>This is a child element.</BabyElement>
// </WindowsMembership.WindowsRole>
//</RootTag>
//
//This sample completed successfully; press Exit to continue.
using namespace System;
using namespace System::Security;
using namespace System::Collections;
ref class SecurityElementMembers
{
public:
[STAThread]
int TestSecurityElementMembers()
{
SecurityElement^ xmlRootElement = gcnew SecurityElement( L"RootTag",L"XML security tree" );
AddAttribute( xmlRootElement, L"creationdate", DateTime::Now.ToString() );
AddChildElement( xmlRootElement, L"destroytime", DateTime::Now.AddSeconds( 1.0 ).ToString() );
SecurityElement^ windowsRoleElement = gcnew SecurityElement( L"WindowsMembership.WindowsRole" );
windowsRoleElement->AddAttribute( L"version", L"1.00" );
// Add a child element and a creationdate attribute.
AddChildElement( windowsRoleElement, L"BabyElement", L"This is a child element" );
AddAttribute( windowsRoleElement, L"creationdate", DateTime::Now.ToString() );
xmlRootElement->AddChild( windowsRoleElement );
CompareAttributes( xmlRootElement, L"creationdate" );
ConvertToHashTable( xmlRootElement );
DisplaySummary( xmlRootElement );
// Determine if the security element is too old to keep.
xmlRootElement = DestroyTree( xmlRootElement );
if ( xmlRootElement != nullptr )
{
String^ elementInXml = xmlRootElement->ToString();
Console::WriteLine( elementInXml );
}
Console::WriteLine( L"This sample completed successfully; "
L"press Enter to exit." );
Console::ReadLine();
return 1;
}
private:
// Add an attribute to the specified security element.
static SecurityElement^ AddAttribute( SecurityElement^ xmlElement, String^ attributeName, String^ attributeValue )
{
if ( xmlElement != nullptr )
{
// Verify that the attribute name and value are valid XML formats.
if ( SecurityElement::IsValidAttributeName( attributeName ) &&
SecurityElement::IsValidAttributeValue( attributeValue ) )
{
// Add the attribute to the security element.
xmlElement->AddAttribute( attributeName, attributeValue );
}
}
return xmlElement;
}
// Add a child element to the specified security element.
static SecurityElement^ AddChildElement( SecurityElement^ parentElement, String^ tagName, String^ tagText )
{
if ( parentElement != nullptr )
{
// Ensure that the tag text is in valid XML format.
if ( !SecurityElement::IsValidText( tagText ) )
{
// Replace invalid text with valid XML text
// to enforce proper XML formatting.
tagText = SecurityElement::Escape( tagText );
}
// Determine whether the tag is in valid XML format.
if ( SecurityElement::IsValidTag( tagName ) )
{
SecurityElement^ childElement;
childElement = parentElement->SearchForChildByTag( tagName );
if ( childElement != nullptr )
{
String^ elementText;
elementText = parentElement->SearchForTextOfTag( tagName );
if ( !elementText->Equals( tagText ) )
{
// Add child element to the parent security element.
parentElement->AddChild( gcnew SecurityElement( tagName,tagText ) );
}
}
else
{
// Add child element to the parent security element.
parentElement->AddChild( gcnew SecurityElement( tagName,tagText ) );
}
}
}
return parentElement;
}
// Create and display a summary sentence
// about the specified security element.
static void DisplaySummary( SecurityElement^ xmlElement )
{
// Retrieve tag name for the security element.
String^ xmlTreeName = xmlElement->Tag->ToString();
// Retrieve tag text for the security element.
String^ xmlTreeDescription = xmlElement->Text;
// Retrieve value of the creationdate attribute.
String^ xmlCreationDate = xmlElement->Attribute(L"creationdate");
// Retrieve the number of children under the security element.
String^ childrenCount = xmlElement->Children->Count.ToString();
String^ outputMessage = String::Format( L"The security XML tree named {0}", xmlTreeName );
outputMessage = String::Concat( outputMessage, String::Format( L"({0})", xmlTreeDescription ) );
outputMessage = String::Concat( outputMessage, String::Format( L" was created on {0} and ", xmlCreationDate ) );
outputMessage = String::Concat( outputMessage, String::Format( L"contains {0} child elements.", childrenCount ) );
Console::WriteLine( outputMessage );
}
// Compare the first two occurrences of an attribute
// in the specified security element.
static void CompareAttributes( SecurityElement^ xmlElement, String^ attributeName )
{
// Create a hash table containing the security element's attributes.
Hashtable^ attributeKeys = xmlElement->Attributes;
String^ attributeValue = attributeKeys[ attributeName ]->ToString();
IEnumerator^ myEnum = xmlElement->Children->GetEnumerator();
while ( myEnum->MoveNext() )
{
SecurityElement^ xmlChild = safe_cast<SecurityElement^>(myEnum->Current);
if ( attributeValue->Equals( xmlChild->Attribute(attributeName) ) )
{
// The security elements were created at the exact same time.
}
}
}
// Convert the contents of the specified security element
// to hash codes stored in a hash table.
static void ConvertToHashTable( SecurityElement^ xmlElement )
{
// Create a hash table to hold hash codes of the security elements.
Hashtable^ xmlAsHash = gcnew Hashtable;
int rootIndex = xmlElement->GetHashCode();
xmlAsHash->Add( rootIndex, L"root" );
int parentNum = 0;
IEnumerator^ myEnum1 = xmlElement->Children->GetEnumerator();
while ( myEnum1->MoveNext() )
{
SecurityElement^ xmlParent = safe_cast<SecurityElement^>(myEnum1->Current);
parentNum++;
xmlAsHash->Add( xmlParent->GetHashCode(), String::Format( L"parent{0}", parentNum ) );
if ( (xmlParent->Children != nullptr) && (xmlParent->Children->Count > 0) )
{
int childNum = 0;
IEnumerator^ myEnum2 = xmlParent->Children->GetEnumerator();
while ( myEnum2->MoveNext() )
{
SecurityElement^ xmlChild = safe_cast<SecurityElement^>(myEnum2->Current);
childNum++;
xmlAsHash->Add( xmlChild->GetHashCode(), String::Format( L"child{0}", childNum ) );
}
}
}
}
// Delete the specified security element if the current time is past
// the time stored in the destroytime tag.
static SecurityElement^ DestroyTree( SecurityElement^ xmlElement )
{
SecurityElement^ localXmlElement = xmlElement;
SecurityElement^ destroyElement = localXmlElement->SearchForChildByTag( L"destroytime" );
// Verify that a destroytime tag exists.
if ( localXmlElement->SearchForChildByTag( L"destroytime" ) != nullptr )
{
// Retrieve the destroytime text to get the time
// the tree can be destroyed.
String^ storedDestroyTime = localXmlElement->SearchForTextOfTag( L"destroytime" );
DateTime destroyTime = DateTime::Parse( storedDestroyTime );
if ( DateTime::Now > destroyTime )
{
localXmlElement = nullptr;
Console::WriteLine( L"The XML security tree has been deleted." );
}
}
// Verify that xmlElement is of type SecurityElement.
if ( xmlElement->GetType()->Equals( System::Security::SecurityElement::typeid ) )
{
// Determine whether the localXmlElement object
// differs from xmlElement.
if ( xmlElement->Equals( localXmlElement ) )
{
// Verify that the tags, attributes and children of the
// two security elements are identical.
if ( xmlElement->Equal( localXmlElement ) )
{
// Return the original security element.
return xmlElement;
}
}
}
// Return the modified security element.
return localXmlElement;
}
};
int main()
{
SecurityElementMembers^ sem = gcnew SecurityElementMembers;
sem->TestSecurityElementMembers();
}
//
// This sample produces the following output:
//
// The security XML tree named RootTag(XML security tree)
// was created on 2/23/2004 1:23:00 PM and contains 2 child elements.
//<RootTag creationdate="2/23/2004 1:23:00 PM">XML security tree
// <destroytime>2/23/2004 1:23:01 PM</destroytime>
// <WindowsMembership.WindowsRole version="1.00"
// creationdate="2/23/2004 1:23:00 PM">
// <BabyElement>This is a child element.</BabyElement>
// </WindowsMembership.WindowsRole>
//</RootTag>
//
//This sample completed successfully; press Exit to continue.
import System.*;
import System.Security.*;
import System.Collections.*;
class SecurityElementMembers
{
/** @attribute STAThread()
*/
public static void main(String[] args)
{
SecurityElement xmlRootElement = new SecurityElement(
"RootTag", "XML security tree");
AddAttribute(xmlRootElement, "creationdate",
DateTime.get_Now().ToString());
AddChildElement(xmlRootElement, "destroytime",
DateTime.get_Now().AddSeconds(1.0).ToString());
SecurityElement windowsRoleElement
= new SecurityElement("WindowsMembership.WindowsRole");
windowsRoleElement.AddAttribute("version", "1.00");
// Add a child element and a creationdate attribute.
AddChildElement(windowsRoleElement, "BabyElement",
"This is a child element");
AddAttribute(windowsRoleElement, "creationdate",
DateTime.get_Now().ToString());
xmlRootElement.AddChild(windowsRoleElement);
CompareAttributes(xmlRootElement, "creationdate");
ConvertToHashTable(xmlRootElement);
DisplaySummary(xmlRootElement);
// Determine if the security element is too old to keep.
xmlRootElement = DestroyTree(xmlRootElement);
if (xmlRootElement != null) {
String elementInXml = xmlRootElement.ToString();
Console.WriteLine(elementInXml);
}
Console.WriteLine("This sample completed successfully; "
+ "press Enter to exit.");
Console.ReadLine();
} //main
// Add an attribute to the specified security element.
private static SecurityElement AddAttribute(SecurityElement xmlElement,
String attributeName, String attributeValue)
{
if (xmlElement != null) {
// Verify that the attribute name and value are valid XML formats.
if (SecurityElement.IsValidAttributeName(attributeName)
&& SecurityElement.IsValidAttributeValue(attributeValue)) {
// Add the attribute to the security element.
xmlElement.AddAttribute(attributeName, attributeValue);
}
}
return xmlElement;
} //AddAttribute
// Add a child element to the specified security element.
private static SecurityElement AddChildElement(
SecurityElement parentElement, String tagName, String tagText)
{
if (parentElement != null) {
// Ensure that the tag text is in valid XML format.
if (!(SecurityElement.IsValidText(tagText))) {
// Replace invalid text with valid XML text
// to enforce proper XML formatting.
tagText = SecurityElement.Escape(tagText);
}
// Determine whether the tag is in valid XML format.
if (SecurityElement.IsValidTag(tagName)) {
SecurityElement childElement;
childElement = parentElement.SearchForChildByTag(tagName);
if (childElement != null) {
String elementText;
elementText = parentElement.SearchForTextOfTag(tagName);
if (!(elementText.Equals(tagText))) {
// Add child element to the parent security element.
parentElement.AddChild(new SecurityElement(tagName,
tagText));
}
}
else {
// Add child element to the parent security element.
parentElement.AddChild(new SecurityElement(tagName,
tagText));
}
}
}
return parentElement;
} //AddChildElement
// Create and display a summary sentence
// about the specified security element.
private static void DisplaySummary(SecurityElement xmlElement)
{
// Retrieve tag name for the security element.
String xmlTreeName = xmlElement.get_Tag().ToString();
// Retrieve tag text for the security element.
String xmlTreeDescription = xmlElement.get_Text();
// Retrieve value of the creationdate attribute.
String xmlCreationDate = xmlElement.Attribute("creationdate");
// Retrieve the number of children under the security element.
String childrenCount
= System.Convert.ToString(xmlElement.get_Children().get_Count());
String outputMessage = "The security XML tree named " + xmlTreeName;
outputMessage += "(" + xmlTreeDescription + ")";
outputMessage += " was created on " + xmlCreationDate + " and ";
outputMessage += "contains " + childrenCount + " child elements.";
Console.WriteLine(outputMessage);
} //DisplaySummary
// Compare the first two occurrences of an attribute
// in the specified security element.
private static void CompareAttributes(SecurityElement xmlElement,
String attributeName)
{
// Create a hash table containing the security element's attributes.
Hashtable attributeKeys = xmlElement.get_Attributes();
String attributeValue = attributeKeys.get_Item(attributeName).ToString();
for (int iCtr = 0; iCtr
< xmlElement.get_Children().get_Count(); iCtr++) {
SecurityElement xmlChild
= (SecurityElement)xmlElement.get_Children().get_Item(iCtr);
if (attributeValue.Equals(xmlChild.Attribute(attributeName))) {
}
}
} //CompareAttributes
// The security elements were created at the exact same time.
// Convert the contents of the specified security element
// to hash codes stored in a hash table.
private static void ConvertToHashTable(SecurityElement xmlElement)
{
// Create a hash table to hold hash codes of the security elements.
Hashtable xmlAsHash = new Hashtable();
int rootIndex = xmlElement.GetHashCode();
xmlAsHash.Add((Int32)rootIndex, "root");
int parentNum = 0;
for (int iCtr1 = 0; iCtr1
< xmlElement.get_Children().get_Count(); iCtr1++) {
SecurityElement xmlParent
= (SecurityElement)xmlElement.get_Children().get_Item(iCtr1);
parentNum++;
xmlAsHash.Add((Int32)xmlParent.GetHashCode(), "parent" + parentNum);
if (xmlParent.get_Children() != null
&& xmlParent.get_Children().get_Count() > 0) {
int childNum = 0;
for (int iCtr2 = 0; iCtr2
< xmlParent.get_Children().get_Count(); iCtr2++) {
SecurityElement xmlChild = (SecurityElement)xmlParent.
get_Children().get_Item(iCtr2);
childNum++;
xmlAsHash.Add((Int32)xmlChild.GetHashCode(), "child"
+ childNum);
}
}
}
} //ConvertToHashTable
// Delete the specified security element if the current time is past
// the time stored in the destroytime tag.
private static SecurityElement DestroyTree(SecurityElement xmlElement)
{
SecurityElement localXmlElement = xmlElement;
SecurityElement destroyElement
= localXmlElement.SearchForChildByTag("destroytime");
// Verify that a destroytime tag exists.
if (localXmlElement.SearchForChildByTag("destroytime") != null) {
// Retrieve the destroytime text to get the time
// the tree can be destroyed.
String storedDestroyTime = localXmlElement.SearchForTextOfTag(
"destroytime");
DateTime destroyTime = DateTime.Parse(storedDestroyTime);
if ((DateTime.get_Now().CompareTo(destroyTime)) > 0) {
localXmlElement = null;
Console.WriteLine("The XML security tree has been deleted.");
}
}
// Verify that xmlElement is of type SecurityElement.
if (xmlElement.GetType().Equals(
System.Security.SecurityElement.class.ToType())) {
// Determine whether the localXmlElement object
// differs from xmlElement.
if (xmlElement.Equals(localXmlElement)) {
// Verify that the tags, attributes and children of the
// two security elements are identical.
if (xmlElement.Equal(localXmlElement)) {
// Return the original security element.
return xmlElement;
}
}
}
// Return the modified security element.
return localXmlElement;
} //DestroyTree
} //SecurityElementMembers
//
// This sample produces the following output:
//
// The security XML tree named RootTag(XML security tree)
// was created on 2/23/2004 1:23:00 PM and contains 2 child elements.
//<RootTag creationdate="2/23/2004 1:23:00 PM">XML security tree
// <destroytime>2/23/2004 1:23:01 PM</destroytime>
// <WindowsMembership.WindowsRole version="1.00"
// creationdate="2/23/2004 1:23:00 PM">
// <BabyElement>This is a child element.</BabyElement>
// </WindowsMembership.WindowsRole>
//</RootTag>
//
//This sample completed successfully; press Exit to continue.
Vererbungshierarchie
System.Object
System.Security.SecurityElement
Threadsicherheit
Alle öffentlichen statischen (Shared in Visual Basic) Member dieses Typs sind threadsicher. Bei Instanzmembern ist die Threadsicherheit nicht gewährleistet.
Plattformen
Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.
Versionsinformationen
.NET Framework
Unterstützt in: 2.0, 1.1, 1.0