EventWaitHandleSecurity.SetAccessRule(EventWaitHandleAccessRule) 方法

定義

命名空間:

System.Security.AccessControl

組件:

System.Threading.AccessControl.dll

組件:

mscorlib.dll

移除與指定規則具有相同使用者和 AccessControlType (允許或拒絕) 的所有存取控制規則，然後加入指定規則。

public:
 void SetAccessRule(System::Security::AccessControl::EventWaitHandleAccessRule ^ rule);

public void SetAccessRule (System.Security.AccessControl.EventWaitHandleAccessRule rule);

override this.SetAccessRule : System.Security.AccessControl.EventWaitHandleAccessRule -> unit

Public Sub SetAccessRule (rule As EventWaitHandleAccessRule)

參數

rule

EventWaitHandleAccessRule

要加入的 EventWaitHandleAccessRule。 這個規則的使用者和 AccessControlType 會決定在加入這項規則之前要移除的規則。

例外狀況

ArgumentNullException

rule 為 null。

範例

下列程式碼範例示範 方法如何 SetAccessRule 移除符合使用者和 AccessControlType 之 rule 的所有規則，並將其取代為 rule 。

此範例會 EventWaitHandleSecurity 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。 然後，此範例會建立新的規則，以允許目前的使用者完全控制，並使用 SetAccessRule 方法來將現有的 Allow 規則取代為新的規則。 拒絕存取的規則不會受到影響。

注意

這個範例不會將安全性物件附加至 EventWaitHandle 物件。 您可以在 和 EventWaitHandle.SetAccessControl 中找到 EventWaitHandle.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.
        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 full control over the event. Use the
        // SetAccessRule method to replace the 
        // existing Allow rule with the new rule. 
        rule = new EventWaitHandleAccessRule(user,
            EventWaitHandleRights.FullControl,
            AccessControlType.Allow);
        mSec.SetAccessRule(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: FullControl
 */

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 full control over the event. Use the
        ' SetAccessRule method to replace the 
        ' the existing Allow rule with the new rule. 
        rule = New EventWaitHandleAccessRule(user, _
            EventWaitHandleRights.FullControl, _
            AccessControlType.Allow)
        mSec.SetAccessRule(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: FullControl

備註

如果指定的規則具有 Allow ，這個方法的效果就是移除指定使用者的所有 Allow 規則，並將規則取代為指定的規則。 如果指定的規則具有 Deny ，則指定使用者的所有 Deny 規則都會取代為指定的規則。

如果沒有使用者符合 AccessControlType 指定規則的規則， rule 則會新增。