RegistrySecurity.RemoveAccessRule(RegistryAccessRule) 方法

定义

命名空间:

System.Security.AccessControl

程序集:

Microsoft.Win32.Registry.dll

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::RegistryAccessRule ^ rule);

public bool RemoveAccessRule (System.Security.AccessControl.RegistryAccessRule rule);

override this.RemoveAccessRule : System.Security.AccessControl.RegistryAccessRule -> bool

Public Function RemoveAccessRule (rule As RegistryAccessRule) As Boolean

参数

rule

RegistryAccessRule

指定要搜索的用户和 RegistryAccessRule 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

Boolean

如果找到一个兼容规则，则为 true；否则为 false。

例外

ArgumentNullException

rule 为 null。

示例

下面的代码示例演示 方法如何 RemoveAccessRule 从兼容规则中删除权限，以及如何将 AddAccessRule 权限与兼容规则合并。

该示例创建 一个 RegistrySecurity 对象并添加一个允许当前用户 RegistryRights.ReadKey 权限的规则。 然后，该示例创建一个规则， RegistryRights.SetValue该规则向用户 授予与第一个规则相同的继承和传播权限，并使用 RemoveAccessRule 方法从 RegistrySecurity 对象中删除此新规则。 SetValue 是 的 ReadKey一部分，因此会将其从兼容规则中删除。 将显示 对象中的 RegistrySecurity 规则，其中显示了 的 ReadKey剩余组成部分。

然后，示例代码调用 RemoveAccessRule 方法，将右侧合并 SetValue 回 对象中的 RegistrySecurity 规则。

注意

此示例不将安全对象附加到 RegistryKey 对象。 本节中的第二个示例附加安全对象，中的 RegistryKey.GetAccessControlRegistryKey.SetAccessControl示例也是如此。

using System;
using System.Security.AccessControl;
using System.Security.Principal;
using System.Security;
using Microsoft.Win32;

public class Example
{

    public static void Main()
    {

        string user = Environment.UserDomainName + "\\"
            + Environment.UserName;

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

        // Add a rule that grants the current user ReadKey
        // rights. ReadKey is a combination of four other 
        // rights. The rule is inherited by all 
        // contained subkeys.
        RegistryAccessRule rule = new RegistryAccessRule(user, 
            RegistryRights.ReadKey, 
            InheritanceFlags.ContainerInherit, 
            PropagationFlags.None, 
            AccessControlType.Allow);
        mSec.AddAccessRule(rule);

        // Create a rule that allows the current user only the 
        // right to query the key/value pairs of a key, using  
        // the same inheritance and propagation flags as the
        // first rule. QueryValues is a constituent of 
        // ReadKey, so when this rule is removed, using the 
        // RemoveAccessRule method, ReadKey is broken into
        // its constituent parts.
        rule = new RegistryAccessRule(user, 
            RegistryRights.QueryValues, 
            InheritanceFlags.ContainerInherit, 
            PropagationFlags.None, 
            AccessControlType.Allow);
        mSec.RemoveAccessRule(rule);

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

        // Add the second rule back. It merges with the 
        // existing rule, so that the rule is now displayed
        // as ReadKey.
        mSec.AddAccessRule(rule);

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

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

        foreach( RegistryAccessRule 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.RegistryRights);
            Console.WriteLine(" Inheritance: {0}", ar.InheritanceFlags);
            Console.WriteLine(" Propagation: {0}", ar.PropagationFlags);
            Console.WriteLine("   Inherited? {0}", ar.IsInherited);
            Console.WriteLine();
        }
    }
}

/* This code example produces output similar to following:

Current access rules:

        User: TestDomain\TestUser
        Type: Allow
      Rights: EnumerateSubKeys, Notify, ReadPermissions
 Inheritance: ContainerInherit
 Propagation: None
   Inherited? False


Current access rules:

        User: TestDomain\TestUser
        Type: Allow
      Rights: ReadKey
 Inheritance: ContainerInherit
 Propagation: None
   Inherited? False
 */

Option Explicit
Imports System.Security.AccessControl
Imports System.Security.Principal
Imports System.Security
Imports Microsoft.Win32

Public Class Example

    Public Shared Sub Main()

        Dim user As String = Environment.UserDomainName _ 
            & "\" & Environment.UserName

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

        ' Add a rule that grants the current user ReadKey
        ' rights. ReadKey is a combination of four other 
        ' rights. The rule is inherited by all 
        ' contained subkeys.
        Dim rule As New RegistryAccessRule(user, _
            RegistryRights.ReadKey, _
            InheritanceFlags.ContainerInherit, _
            PropagationFlags.None, _
            AccessControlType.Allow)
        mSec.AddAccessRule(rule)

        ' Create a rule that allows the current user only the 
        ' right to query the key/value pairs of a key, using  
        ' the same inheritance and propagation flags as the
        ' first rule. QueryValues is a constituent of 
        ' ReadKey, so when this rule is removed, using the 
        ' RemoveAccessRule method, ReadKey is broken into
        ' its constituent parts.
        rule = New RegistryAccessRule(user, _
            RegistryRights.QueryValues, _
            InheritanceFlags.ContainerInherit, _
            PropagationFlags.None, _
            AccessControlType.Allow)
        mSec.RemoveAccessRule(rule)

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

        ' Add the second rule back. It merges with the 
        ' existing rule, so that the rule is now displayed
        ' as ReadKey.
        mSec.AddAccessRule(rule)

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

    End Sub 

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

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

            Console.WriteLine("        User: {0}", ar.IdentityReference)
            Console.WriteLine("        Type: {0}", ar.AccessControlType)
            Console.WriteLine("      Rights: {0}", ar.RegistryRights)
            Console.WriteLine(" Inheritance: {0}", ar.InheritanceFlags)
            Console.WriteLine(" Propagation: {0}", ar.PropagationFlags)
            Console.WriteLine("   Inherited? {0}", ar.IsInherited)
            Console.WriteLine()
        Next

    End Sub
End Class 

'This code example produces output similar to following:
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: EnumerateSubKeys, Notify, ReadPermissions
' Inheritance: ContainerInherit
' Propagation: None
'   Inherited? False
'
'
'Current access rules:
'
'        User: TestDomain\TestUser
'        Type: Allow
'      Rights: ReadKey
' Inheritance: ContainerInherit
' Propagation: None
'   Inherited? False
'

注解

当前 RegistrySecurity 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，并且该方法返回 true。 如果 rule 指定了未包含在兼容规则中的权限，则不会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 RegistrySecurity 对象中删除整个规则。