WebPermission.IsSubsetOf(IPermission) 方法

定义

命名空间:

System.Net

程序集:

System.Security.Permissions.dll

包:

System.Security.Permissions v9.0.0-rc.2.24473.5

Source:

WebPermission.cs

确定当前 WebPermission 是否是指定对象的子集。

public:
 override bool IsSubsetOf(System::Security::IPermission ^ target);

public override bool IsSubsetOf (System.Security.IPermission target);

override this.IsSubsetOf : System.Security.IPermission -> bool

Public Overrides Function IsSubsetOf (target As IPermission) As Boolean

参数

target

IPermission

要与当前 WebPermission 进行比较的 WebPermission。

返回

Boolean

如果当前实例是 target 参数的子集，则为 true；否则为 false。 如果目标为 null，则对于受限制的、空的当前权限，该方法返回 true；否则返回 false。

例外

ArgumentException

目标参数不是 WebPermission 的实例。

NotSupportedException

当前实例包含 Regex 编码的权限，并且目标实例中未找到完全相同的权限。

示例

以下示例使用 IsSubsetOf 来确定在 的一个实例 WebPermission 中找到的访问权限是否位于 的另一个实例中 WebPermission。

// Create the target permission.
WebPermission^ targetPermission = gcnew WebPermission;
targetPermission->AddPermission( NetworkAccess::Connect, gcnew Regex( "www\\.contoso\\.com/Public/.*" ) );

// Create the permission for a URI matching target.
WebPermission^ connectPermission = gcnew WebPermission;
connectPermission->AddPermission( NetworkAccess::Connect, "www.contoso.com/Public/default.htm" );

//The following statement prints true.
Console::WriteLine( "Is the second URI a subset of the first one?: {0}", connectPermission->IsSubsetOf( targetPermission ) );

// Create the target permission.
WebPermission targetPermission = new WebPermission();
targetPermission.AddPermission(NetworkAccess.Connect, new Regex("www\\.contoso\\.com/Public/.*"));

// Create the permission for a URI matching target.
WebPermission connectPermission = new WebPermission();
connectPermission.AddPermission(NetworkAccess.Connect, "www.contoso.com/Public/default.htm");

//The following statement prints true.
Console.WriteLine("Is the second URI a subset of the first one?: " + connectPermission.IsSubsetOf(targetPermission));

   ' Create the target permission.
   Dim targetPermission As New WebPermission()
   targetPermission.AddPermission(NetworkAccess.Connect, New Regex("www\.contoso\.com/Public/.*"))
   
   ' Create the permission for a URI matching target.
   Dim connectPermission As New WebPermission()
   connectPermission.AddPermission(NetworkAccess.Connect, "www.contoso.com/Public/default.htm")
   
   'The following statement prints true.
   Console.WriteLine(("Is the second URI a subset of the first one?: " & connectPermission.IsSubsetOf(targetPermission)))
End Sub

注解

如果当前 WebPermission 指定了一组完全包含在 target 参数中的关联资源，则当前 WebPermission 是 的 target子集。 此方法重写 IsSubsetOf 并实现以支持 IPermission 接口。