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IPermission.Intersect(IPermission) 方法

定義

建立並傳回目前權限與指定權限交集的權限。

public:
 System::Security::IPermission ^ Intersect(System::Security::IPermission ^ target);
public System.Security.IPermission? Intersect (System.Security.IPermission? target);
public System.Security.IPermission Intersect (System.Security.IPermission target);
abstract member Intersect : System.Security.IPermission -> System.Security.IPermission
Public Function Intersect (target As IPermission) As IPermission

參數

target
IPermission

要與目前權限產生交集的權限。 必須與目前權限屬於相同的類型。

傳回

新使用權限,表示目前使用權限和指定使用權限的交集。 如果交集是空的,這個新權限就是 null

例外狀況

target 參數不是 null,而且執行個體與目前權限屬於不同類別。

範例

下列程式代碼範例示範如何實作 Intersect 方法。 此程式代碼範例是針對 類別提供的較大範例的 IPermission 一部分。

    // Return a new object that contains the intersection 
    // of 'this' and 'target'.
public:
    virtual IPermission^ Intersect(IPermission^ target) override
    {
        // If 'target' is null, return null.
        if (target == nullptr)
        {
            return nullptr;
        }

        // Both objects must be the same type.
        SoundPermission^ soundPerm = VerifyTypeMatch(target);

        // If 'this' and 'target' are unrestricted, 
        // return a new unrestricted permission.
        if (specifiedAsUnrestricted && soundPerm->specifiedAsUnrestricted)
        {
            return Clone(true, SoundPermissionState::PlayAnySound);
        }

        // Calculate the intersected permissions. 
        // If there are none, return null.
        SoundPermissionState minimumPermission = (SoundPermissionState)
            Math::Min((int) stateFlags, (int) soundPerm->stateFlags);
        if ((int)minimumPermission == 0)
        {
            return nullptr;
        }

        // Return a new object with the intersected permission value.
        return Clone(false, minimumPermission);
    }
// Return a new object that contains the intersection of 'this' and 'target'.
public override IPermission Intersect(IPermission target)
{
    // If 'target' is null, return null.
    if (target == null) return null;

    // Both objects must be the same type.
    SoundPermission soundPerm = VerifyTypeMatch(target);

    // If 'this' and 'target' are unrestricted, return a new unrestricted permission.
    if (m_specifiedAsUnrestricted && soundPerm.m_specifiedAsUnrestricted)
        return Clone(true, SoundPermissionState.PlayAnySound);

    // Calculate the intersected permissions. If there are none, return null.
    SoundPermissionState val = (SoundPermissionState)
        Math.Min((Int32)m_flags, (Int32)soundPerm.m_flags);
    if (val == 0) return null;

    // Return a new object with the intersected permission value.
    return Clone(false, val);
}
' Return a new object that contains the intersection of 'this' and 'target'.
Public Overrides Function Intersect(ByVal target As IPermission) As IPermission
    ' If 'target' is null, return null.
    If target Is Nothing Then
        Return Nothing
    End If
    ' Both objects must be the same type.
    Dim soundPerm As SoundPermission = VerifyTypeMatch(target)

    ' If 'this' and 'target' are unrestricted, return a new unrestricted permission.
    If m_specifiedAsUnrestricted AndAlso soundPerm.m_specifiedAsUnrestricted Then
        Return Clone(True, SoundPermissionState.PlayAnySound)
    End If
    ' Calculate the intersected permissions. If there are none, return null.
    Dim val As SoundPermissionState = CType(Math.Min(CType(m_flags, Int32), CType(soundPerm.m_flags, Int32)), SoundPermissionState)
    If val = 0 Then
        Return Nothing
    End If
    ' Return a new object with the intersected permission value.
    Return Clone(False, val)

End Function 'Intersect

備註

兩個許可權的交集是描述兩者共同描述之作業集的許可權。 只有傳遞兩個原始許可權的要求才會通過交集。

方法的所有實 Intersect 作都需要下列語句為 true。 XY 表示 IPermission 不是 null的物件參考。

  • X. (交集) X 傳回等於 X的值。

  • X.) 交集 (Y 傳回與 相同的值 Y。交集 (X) 。

  • X. null) (交集傳 null回 。

適用於