public override IPermission Intersect(IPermission target)
{
if (target == null)
{
return(null);
}
if (!base.VerifyType(target))
{
throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", new object[] { base.GetType().FullName }));
}
IsolatedStorageFilePermission permission = (IsolatedStorageFilePermission)target;
if (permission.IsUnrestricted())
{
return(this.Copy());
}
if (base.IsUnrestricted())
{
return(target.Copy());
}
IsolatedStorageFilePermission permission2 = new IsolatedStorageFilePermission(PermissionState.None)
{
m_userQuota = IsolatedStoragePermission.min(base.m_userQuota, permission.m_userQuota),
m_machineQuota = IsolatedStoragePermission.min(base.m_machineQuota, permission.m_machineQuota),
m_expirationDays = IsolatedStoragePermission.min(base.m_expirationDays, permission.m_expirationDays),
m_permanentData = base.m_permanentData && permission.m_permanentData,
m_allowed = (IsolatedStorageContainment)((int)IsolatedStoragePermission.min((long)base.m_allowed, (long)permission.m_allowed))
};
if ((((permission2.m_userQuota == 0L) && (permission2.m_machineQuota == 0L)) && ((permission2.m_expirationDays == 0L) && !permission2.m_permanentData)) && (permission2.m_allowed == IsolatedStorageContainment.None))
{
return(null);
}
return(permission2);
}
/// <summary>创建并返回一个权限，该权限是当前权限和指定权限的交集。</summary>
/// <returns>一个新权限，它表示当前权限与指定权限的交集。如果交集为空，则此新权限为 null。</returns>
/// <param name="target">与当前权限对象相交的权限。它必须与当前权限属于同一类型。</param>
/// <exception cref="T:System.ArgumentException">
/// <paramref name="target" /> 参数不是 null，而且与当前权限不是同一类型。</exception>
public override IPermission Intersect(IPermission target)
{
if (target == null)
{
return((IPermission)null);
}
if (!this.VerifyType(target))
{
throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", (object)this.GetType().FullName));
}
IsolatedStorageFilePermission storageFilePermission1 = (IsolatedStorageFilePermission)target;
if (storageFilePermission1.IsUnrestricted())
{
return(this.Copy());
}
if (this.IsUnrestricted())
{
return(target.Copy());
}
IsolatedStorageFilePermission storageFilePermission2 = new IsolatedStorageFilePermission(PermissionState.None);
storageFilePermission2.m_userQuota = IsolatedStoragePermission.min(this.m_userQuota, storageFilePermission1.m_userQuota);
storageFilePermission2.m_machineQuota = IsolatedStoragePermission.min(this.m_machineQuota, storageFilePermission1.m_machineQuota);
storageFilePermission2.m_expirationDays = IsolatedStoragePermission.min(this.m_expirationDays, storageFilePermission1.m_expirationDays);
storageFilePermission2.m_permanentData = this.m_permanentData && storageFilePermission1.m_permanentData;
storageFilePermission2.m_allowed = (IsolatedStorageContainment)IsolatedStoragePermission.min((long)this.m_allowed, (long)storageFilePermission1.m_allowed);
if (storageFilePermission2.m_userQuota == 0L && storageFilePermission2.m_machineQuota == 0L && (storageFilePermission2.m_expirationDays == 0L && !storageFilePermission2.m_permanentData) && storageFilePermission2.m_allowed == IsolatedStorageContainment.None)
{
return((IPermission)null);
}
return((IPermission)storageFilePermission2);
}