MutexSecurity.RemoveAccessRule(MutexAccessRule) 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
搜尋具有與指定之規則相同的使用者和 AccessControlType (允許或拒絕) 以及具有相容的繼承和傳用旗標的存取控制規則。如果找到這樣的規則，則會移除指定之存取規則中所包含的權限。
public:
bool RemoveAccessRule(System::Security::AccessControl::MutexAccessRule ^ rule);public bool RemoveAccessRule (System.Security.AccessControl.MutexAccessRule rule);override this.RemoveAccessRule : System.Security.AccessControl.MutexAccessRule -> boolPublic Function RemoveAccessRule (rule As MutexAccessRule) As Boolean參數
- rule
- MutexAccessRule
MutexAccessRule，其會指定要搜尋的使用者和 AccessControlType，以及必須與相符的規則 (如果找到的話) 相容的繼承和傳用旗標集合。 如果找到的話，指定從相容的規則中移除此權限。
傳回
如果找到相容的規則，則為 true，否則為 false。
例外狀況
rule 為 null。
範例
下列程式代碼範例示範如何使用 RemoveAccessRule 方法，從 Allow 物件中的 MutexSecurity 規則中移除許可權。 它也會顯示 中其他許可權 rule 會被忽略。
此範例會 MutexSecurity 建立 物件，並新增規則，以允許和拒絕目前使用者的各種許可權。 允許的權限包括 Modify、 ReadPermissions與 Synchronize。 然後，此範例會為目前使用者建立新的規則，包括 ReadPermissions 和許可權，並將該規則與方法搭配RemoveAccessRule使用，以從 Allow 物件中的MutexSecurity規則中移除ReadPermissionsTakeOwnership。 會忽略 中的rule不適當TakeOwnership許可權。
注意
這個範例不會將安全性物件附加至 Mutex 物件。 您可以在和 Mutex.SetAccessControl中找到Mutex.GetAccessControl附加安全性物件的範例。
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.
MutexSecurity mSec = new MutexSecurity();
// Add a rule that grants the current user the
// right to enter or release the mutex and read the
// permissions on the mutex.
MutexAccessRule rule = new MutexAccessRule(user,
MutexRights.Synchronize | MutexRights.Modify
| MutexRights.ReadPermissions,
AccessControlType.Allow);
mSec.AddAccessRule(rule);
// Add a rule that denies the current user the
// right to change permissions on the mutex.
rule = new MutexAccessRule(user,
MutexRights.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 mutex, and
// take ownership of the mutex. 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 MutexAccessRule(user,
MutexRights.TakeOwnership |
MutexRights.ReadPermissions,
AccessControlType.Allow);
mSec.RemoveAccessRule(rule);
ShowSecurity(mSec);
}
private static void ShowSecurity(MutexSecurity security)
{
Console.WriteLine("\r\nCurrent access rules:\r\n");
foreach(MutexAccessRule 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.MutexRights);
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 MutexSecurity()
' Add a rule that grants the current user the
' right to enter or release the mutex, and to
' read its permissions.
Dim rule As New MutexAccessRule(user, _
MutexRights.Synchronize _
Or MutexRights.Modify _
Or MutexRights.ReadPermissions, _
AccessControlType.Allow)
mSec.AddAccessRule(rule)
' Add a rule that denies the current user the
' right to change permissions on the mutex.
rule = New MutexAccessRule(user, _
MutexRights.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 mutex, and
' take ownership of the mutex. 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 MutexAccessRule(user, _
MutexRights.TakeOwnership _
Or MutexRights.ReadPermissions, _
AccessControlType.Allow)
mSec.RemoveAccessRule(rule)
ShowSecurity(mSec)
End Sub
Private Shared Sub ShowSecurity(ByVal security As MutexSecurity)
Console.WriteLine(vbCrLf & "Current access rules:" & vbCrLf)
For Each ar As MutexAccessRule In _
security.GetAccessRules(True, True, GetType(NTAccount))
Console.WriteLine(" User: {0}", ar.IdentityReference)
Console.WriteLine(" Type: {0}", ar.AccessControlType)
Console.WriteLine(" Rights: {0}", ar.MutexRights)
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
備註
目前 MutexSecurity 會搜尋具有相同用戶的規則，以及與 rule相同的AccessControlType值。 如果找不到這類規則，則不會採取任何動作，而且方法會傳 false回 。 如果找到相符的規則，則會檢查其繼承和相容性旗標是否與 中指定的 rule旗標相容。 如果找不到相容的規則，則不會採取任何動作，而且方法會傳 false回 。 如果找到具有相容旗標的規則，則會從相容的規則中移除中指定的 rule 許可權，而 方法會傳 true回 。 如果 rule 指定相容規則中未包含的許可權，則不會針對這些許可權採取任何動作。 如果從相容規則中移除所有許可權，則會從目前的 MutexSecurity 物件中移除整個規則。
重要
雖然您可以指定 mutex 存取規則的繼承和傳播旗標，但建議使用 方法建立它們 AccessRuleFactory 。 繼承和傳播對具名 Mutex 沒有任何意義，而且它們會使存取規則的維護更為複雜。
