EventWaitHandleAccessRule Constructors

Definition

Initializes a new instance of the EventWaitHandleAccessRule class.

Overloads

EventWaitHandleAccessRule(IdentityReference, EventWaitHandleRights, AccessControlType)

Initializes a new instance of the EventWaitHandleAccessRule class, specifying the user or group the rule applies to, the access rights, and whether the specified access rights are allowed or denied.

EventWaitHandleAccessRule(String, EventWaitHandleRights, AccessControlType)

Initializes a new instance of the EventWaitHandleAccessRule class, specifying the name of the user or group the rule applies to, the access rights, and whether the specified access rights are allowed or denied.

EventWaitHandleAccessRule(IdentityReference, EventWaitHandleRights, AccessControlType)

Initializes a new instance of the EventWaitHandleAccessRule class, specifying the user or group the rule applies to, the access rights, and whether the specified access rights are allowed or denied.

public:
 EventWaitHandleAccessRule(System::Security::Principal::IdentityReference ^ identity, System::Security::AccessControl::EventWaitHandleRights eventRights, System::Security::AccessControl::AccessControlType type);
public EventWaitHandleAccessRule (System.Security.Principal.IdentityReference identity, System.Security.AccessControl.EventWaitHandleRights eventRights, System.Security.AccessControl.AccessControlType type);
new System.Security.AccessControl.EventWaitHandleAccessRule : System.Security.Principal.IdentityReference * System.Security.AccessControl.EventWaitHandleRights * System.Security.AccessControl.AccessControlType -> System.Security.AccessControl.EventWaitHandleAccessRule
Public Sub New (identity As IdentityReference, eventRights As EventWaitHandleRights, type As AccessControlType)

Parameters

identity
IdentityReference

The user or group the rule applies to. Must be of type SecurityIdentifier or a type such as NTAccount that can be converted to type SecurityIdentifier.

eventRights
EventWaitHandleRights

A bitwise combination of EventWaitHandleRights values specifying the rights allowed or denied.

type
AccessControlType

One of the AccessControlType values specifying whether the rights are allowed or denied.

Exceptions

eventRights specifies an invalid value.

-or-

type specifies an invalid value.

identity is null.

-or-

eventRights is zero.

identity is neither of type SecurityIdentifier nor of a type such as NTAccount that can be converted to type SecurityIdentifier.

Remarks

To wait on an EventWaitHandle (by calling the WaitOne, WaitAny or WaitAll method), a user must have EventWaitHandleRights.Synchronize access. To signal an event by calling the Set method, or to reset it to the unsignaled state by calling the Reset method, a user must have EventWaitHandleRights.Modify access. To signal an EventWaitHandle object and then wait on it by calling the SignalAndWait method, a user must have Synchronize and Modify access.

EventWaitHandleAccessRule(String, EventWaitHandleRights, AccessControlType)

Initializes a new instance of the EventWaitHandleAccessRule class, specifying the name of the user or group the rule applies to, the access rights, and whether the specified access rights are allowed or denied.

public:
 EventWaitHandleAccessRule(System::String ^ identity, System::Security::AccessControl::EventWaitHandleRights eventRights, System::Security::AccessControl::AccessControlType type);
public EventWaitHandleAccessRule (string identity, System.Security.AccessControl.EventWaitHandleRights eventRights, System.Security.AccessControl.AccessControlType type);
new System.Security.AccessControl.EventWaitHandleAccessRule : string * System.Security.AccessControl.EventWaitHandleRights * System.Security.AccessControl.AccessControlType -> System.Security.AccessControl.EventWaitHandleAccessRule
Public Sub New (identity As String, eventRights As EventWaitHandleRights, type As AccessControlType)

Parameters

identity
String

The name of the user or group the rule applies to.

eventRights
EventWaitHandleRights

A bitwise combination of EventWaitHandleRights values specifying the rights allowed or denied.

type
AccessControlType

One of the AccessControlType values specifying whether the rights are allowed or denied.

Exceptions

eventRights specifies an invalid value.

-or-

type specifies an invalid value.

eventRights is zero.

identity is null.

-or-

identity is a zero-length string.

-or-

identity is longer than 512 characters.

Examples

The following code example demonstrates the use of this constructor to create EventWaitHandleAccessRule objects. The example creates an EventWaitHandleSecurity object, adds rules that allow and deny various rights for the current user, and displays the resulting pair of rules. The example then allows new rights for the current user and displays the result, showing that the new rights are merged with the existing Allow rule.

Note

This example does not attach the security object to a EventWaitHandle object. Examples that attach security objects can be found in EventWaitHandle.GetAccessControl and EventWaitHandle.SetAccessControl.

using System;
using System.Threading;
using System.Security.AccessControl;
using System.Security.Principal;

public class Example
{
    public static void Main()
    {
        // Create a string representing the current user.
        string user = Environment.UserDomainName + "\\" + 
            Environment.UserName;

        // Create a security object that grants no access.
        EventWaitHandleSecurity mSec = new EventWaitHandleSecurity();

        // Add a rule that grants the current user the 
        // right to wait on or signal the event.
        EventWaitHandleAccessRule rule = new EventWaitHandleAccessRule(user, 
            EventWaitHandleRights.Synchronize | EventWaitHandleRights.Modify, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        // Add a rule that denies the current user the 
        // right to change permissions on the event.
        rule = new EventWaitHandleAccessRule(user, 
            EventWaitHandleRights.ChangePermissions, 
            AccessControlType.Deny);
        mSec.AddAccessRule(rule);

        // Display the rules in the security object.
        ShowSecurity(mSec);

        // Add a rule that allows the current user the 
        // right to read permissions on the event. This rule
        // is merged with the existing Allow rule.
        rule = new EventWaitHandleAccessRule(user, 
            EventWaitHandleRights.ReadPermissions, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        ShowSecurity(mSec);
    }

    private static void ShowSecurity(EventWaitHandleSecurity security)
    {
        Console.WriteLine("\r\nCurrent access rules:\r\n");

        foreach(EventWaitHandleAccessRule ar in 
            security.GetAccessRules(true, true, typeof(NTAccount)))
        {
            Console.WriteLine("        User: {0}", ar.IdentityReference);
            Console.WriteLine("        Type: {0}", ar.AccessControlType);
            Console.WriteLine("      Rights: {0}", ar.EventWaitHandleRights);
            Console.WriteLine();
        }
    }
}

/*This code example produces output similar to following:

Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, Synchronize


Current access rules:

        User: TestDomain\TestUser
        Type: Deny
      Rights: ChangePermissions

        User: TestDomain\TestUser
        Type: Allow
      Rights: Modify, ReadPermissions, Synchronize
 */
Imports System.Threading
Imports System.Security.AccessControl
Imports System.Security.Principal

Public Class Example

    Public Shared Sub Main()

        ' Create a string representing the current user.
        Dim user As String = Environment.UserDomainName _ 
            & "\" & Environment.UserName

        ' Create a security object that grants no access.
        Dim mSec As New EventWaitHandleSecurity()

        ' Add a rule that grants the current user the 
        ' right to wait on or signal the event.
        Dim rule As New EventWaitHandleAccessRule(user, _
            EventWaitHandleRights.Synchronize _
            Or EventWaitHandleRights.Modify, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ' Add a rule that denies the current user the 
        ' right to change permissions on the event.
        rule = New EventWaitHandleAccessRule(user, _
            EventWaitHandleRights.ChangePermissions, _
            AccessControlType.Deny)
        mSec.AddAccessRule(rule)

        ' Display the rules in the security object.
        ShowSecurity(mSec)

        ' Add a rule that allows the current user the 
        ' right to read permissions on the event. This rule
        ' is merged with the existing Allow rule.
        rule = New EventWaitHandleAccessRule(user, _
            EventWaitHandleRights.ReadPermissions, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ShowSecurity(mSec)

    End Sub 

    Private Shared Sub ShowSecurity(ByVal security As EventWaitHandleSecurity)
        Console.WriteLine(vbCrLf & "Current access rules:" & vbCrLf)

        For Each ar As EventWaitHandleAccessRule In _
            security.GetAccessRules(True, True, GetType(NTAccount))

            Console.WriteLine("        User: {0}", ar.IdentityReference)
            Console.WriteLine("        Type: {0}", ar.AccessControlType)
            Console.WriteLine("      Rights: {0}", ar.EventWaitHandleRights)
            Console.WriteLine()
        Next

    End Sub
End Class 

'This code example produces output similar to following:
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, Synchronize
'
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Deny
'      Rights: ChangePermissions
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: Modify, ReadPermissions, Synchronize

Remarks

To wait on an EventWaitHandle (by calling the WaitOne, WaitAny or WaitAll method), a user must have EventWaitHandleRights.Synchronize access. To signal an event by calling the Set method, or to reset it to the unsignaled state by calling the Reset method, a user must have EventWaitHandleRights.Modify access. To signal an EventWaitHandle object and then wait on it by calling the SignalAndWait method, a user must have Synchronize and Modify access.

This constructor is equivalent to creating an NTAccount object, by passing identity to the NTAccount.NTAccount(String) constructor, and passing the newly created NTAccount object to the EventWaitHandleAccessRule(IdentityReference, EventWaitHandleRights, AccessControlType) constructor.

Applies to