EventWaitHandleSecurity.RemoveAccessRule(EventWaitHandleAccessRule) 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
搜索如下的访问控制规则：与指定的访问规则具有相同的用户和 AccessControlType（允许或拒绝），并具有兼容的继承和传播标志；如果找到，则从中移除指定访问规则中包含的权限。
public:
bool RemoveAccessRule(System::Security::AccessControl::EventWaitHandleAccessRule ^ rule);public bool RemoveAccessRule (System.Security.AccessControl.EventWaitHandleAccessRule rule);override this.RemoveAccessRule : System.Security.AccessControl.EventWaitHandleAccessRule -> boolPublic Function RemoveAccessRule (rule As EventWaitHandleAccessRule) As Boolean参数
指定要搜索的用户和 EventWaitHandleAccessRule 的 AccessControlType，以及匹配规则（如果找到）必须兼容的一组继承和传播标志。 指定要从兼容规则移除的权限（如果找到）。
返回
如果找到一个兼容规则，则为 true；否则为 false。
例外
rule 为 null。
示例
下面的代码示例演示如何使用 RemoveAccessRule 方法从 Allow 对象中的 EventWaitHandleSecurity 规则中删除权限。 它还显示中其他权限 rule 被忽略。
该示例创建一个 EventWaitHandleSecurity 对象，并添加允许和拒绝当前用户的各种权限的规则。 允许的权限包括 Modify、 ReadPermissions和 Synchronize。 然后，该示例为当前用户创建一个新规则（包括 ReadPermissions 和 TakeOwnership 权限），并将该规则与 方法一起使用RemoveAccessRule，以便从 Allow 对象中的EventWaitHandleSecurity规则中删除ReadPermissions。 中的TakeOwnershiprule右侧将被忽略。
注意
此示例不将安全对象附加到 对象 EventWaitHandle 。 可以在 和 EventWaitHandle.SetAccessControl中找到EventWaitHandle.GetAccessControl附加安全对象的示例。
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 and read the
// permissions on the event.
EventWaitHandleAccessRule rule = new EventWaitHandleAccessRule(user,
EventWaitHandleRights.Synchronize | EventWaitHandleRights.Modify
| EventWaitHandleRights.ReadPermissions,
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);
// Create a rule that grants the current user
// the right to read permissions on the event, and
// take ownership of the event. Use this rule to
// remove the right to read permissions from the
// Allow rule for the current user. The inclusion
// of the right to take ownership has no effect.
rule = new EventWaitHandleAccessRule(user,
EventWaitHandleRights.TakeOwnership |
EventWaitHandleRights.ReadPermissions,
AccessControlType.Allow);
mSec.RemoveAccessRule(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, ReadPermissions, Synchronize
Current access rules:
User: TestDomain\TestUser
Type: Deny
Rights: ChangePermissions
User: TestDomain\TestUser
Type: Allow
Rights: Modify, 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, and to
' read its permissions.
Dim rule As New EventWaitHandleAccessRule(user, _
EventWaitHandleRights.Synchronize _
Or EventWaitHandleRights.Modify _
Or EventWaitHandleRights.ReadPermissions, _
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)
' Create a rule that grants the current user
' the right to read permissions on the event, and
' take ownership of the event. Use this rule to
' remove the right to read permissions from the
' Allow rule for the current user. The inclusion
' of the right to take ownership has no effect.
rule = New EventWaitHandleAccessRule(user, _
EventWaitHandleRights.TakeOwnership _
Or EventWaitHandleRights.ReadPermissions, _
AccessControlType.Allow)
mSec.RemoveAccessRule(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, ReadPermissions, Synchronize
'
'
'Current access rules:
'
' User: TestDomain\TestUser
' Type: Deny
' Rights: ChangePermissions
'
' User: TestDomain\TestUser
' Type: Allow
' Rights: Modify, Synchronize
注解
在当前EventWaitHandleSecurity中搜索与 具有相同用户且值rule相同的AccessControlType规则。 如果未找到此类规则，则不执行任何操作，并且 该方法将返回 false。 如果找到匹配的规则，则会检查其继承和兼容性标志是否与 中指定的 rule标志兼容。 如果未找到兼容的规则，则不执行任何操作，并且 该方法将返回 false。 如果找到具有兼容标志的规则，则会从兼容规则中删除 中指定的 rule 权限，并且 方法将返回 true。 如果 rule 指定了兼容规则中未包含的权限，则不对这些权限执行任何操作。 如果从兼容规则中删除所有权限，则会从当前 EventWaitHandleSecurity 对象中删除整个规则。
重要
尽管可以通过使用 AccessRuleFactory 方法创建事件访问规则来指定继承和传播标志，但不建议这样做。 继承和传播对命名事件没有意义，它们使访问规则的维护更加复杂。
