MutexSecurity.RemoveAccessRuleAll メソッド
アセンブリ: mscorlib (mscorlib.dll 内)



現在の MutexSecurity オブジェクトで、rule と同じユーザーおよび同じ AccessControlType 値が指定された規則が検索されます。この検索の実行時には、rule によって指定された権限はいずれも無視されます。一致する規則が見つからなかった場合、処理は実行されません。

RemoveAccessRuleAll メソッドを使用して、ユーザーと AccessControlType に一致するすべての規則を削除し、権限を無視するコード例を次に示します。
この例では、MutexSecurity オブジェクトを作成し、現在のユーザーに関する各種の権限を許可または拒否する規則を追加して、それらの追加の規則を Allow 規則にマージします。さらに、この例では、現在のユーザーに所有権の取得を許可する新しい規則を作成し、その規則を使用して Allow 規則を MutexSecurity オブジェクトから削除します。
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この例では、セキュリティ オブジェクトが Mutex オブジェクトに割り当てられません。セキュリティ オブジェクトの割り当て例については、Mutex.GetAccessControl および Mutex.SetAccessControl のトピックを参照してください。 |
Imports System 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. Dim rule As New MutexAccessRule(user, _ MutexRights.Synchronize _ Or MutexRights.Modify, _ 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) ' Add a rule that allows the current user the ' right to read permissions on the mutex. This rule ' is merged with the existing Allow rule. rule = New MutexAccessRule(user, _ MutexRights.ReadPermissions, _ AccessControlType.Allow) mSec.AddAccessRule(rule) ShowSecurity(mSec) ' Create a rule that allows the current user to ' change the owner of the mutex, and use that rule ' to remove the existing allow access rule from ' the MutexSecurity object, showing that the user ' and access type must match, while the rights are ' ignored. Console.WriteLine("Use RemoveAccessRuleAll to remove the Allow rule.") rule = New MutexAccessRule(user, _ MutexRights.TakeOwnership, _ AccessControlType.Allow) mSec.RemoveAccessRuleAll(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, Synchronize ' ' 'Current access rules: ' ' User: TestDomain\TestUser ' Type: Deny ' Rights: ChangePermissions ' ' User: TestDomain\TestUser ' Type: Allow ' Rights: Modify, ReadPermissions, Synchronize ' 'Use RemoveAccessRuleAll to remove the Allow rule. ' 'Current access rules: ' ' User: TestDomain\TestUser ' Type: Deny ' Rights: ChangePermissions
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. MutexAccessRule rule = new MutexAccessRule(user, MutexRights.Synchronize | MutexRights.Modify, 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); // Add a rule that allows the current user the // right to read permissions on the mutex. This rule // is merged with the existing Allow rule. rule = new MutexAccessRule(user, MutexRights.ReadPermissions, AccessControlType.Allow); mSec.AddAccessRule(rule); ShowSecurity(mSec); // Create a rule that allows the current user to // change the owner of the mutex, and use that rule // to remove the existing allow access rule from // the MutexSecurity object, showing that the user // and access type must match, while the rights are // ignored. Console.WriteLine("Use RemoveAccessRuleAll to remove the Allow rule."); rule = new MutexAccessRule(user, MutexRights.TakeOwnership, AccessControlType.Allow); mSec.RemoveAccessRuleAll(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, Synchronize Current access rules: User: TestDomain\TestUser Type: Deny Rights: ChangePermissions User: TestDomain\TestUser Type: Allow Rights: Modify, ReadPermissions, Synchronize Use RemoveAccessRuleAll to remove the Allow rule. Current access rules: User: TestDomain\TestUser Type: Deny Rights: ChangePermissions */

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