System.Security.Permissions.FileIOAccess.IsEmpty C# (CSharp) Метод

        public bool IsEmpty()
        {
            return !m_allFiles && !m_allLocalFiles && (m_set == null || m_set.IsEmpty());
        }
        

        /// <summary>创建一个权限，该权限是当前权限与指定权限的并集。</summary>
        /// <returns>一个新权限，它表示当前权限与指定权限的并集。</returns>
        /// <param name="other">将与当前权限合并的权限。它必须与当前权限属于同一类型。</param>
        /// <exception cref="T:System.ArgumentException">
        /// <paramref name="other" /> 参数不是 null，而且与当前权限不是同一类型。</exception>
        public override IPermission Union(IPermission other)
        {
            if (other == null)
            {
                return(this.Copy());
            }
            FileIOPermission fileIoPermission = other as FileIOPermission;

            if (fileIoPermission == null)
            {
                throw new ArgumentException(Environment.GetResourceString("Argument_WrongType", (object)this.GetType().FullName));
            }
            if (this.IsUnrestricted() || fileIoPermission.IsUnrestricted())
            {
                return((IPermission) new FileIOPermission(PermissionState.Unrestricted));
            }
            FileIOAccess fileIoAccess1 = this.m_read == null ? fileIoPermission.m_read : this.m_read.Union(fileIoPermission.m_read);
            FileIOAccess fileIoAccess2 = this.m_write == null ? fileIoPermission.m_write : this.m_write.Union(fileIoPermission.m_write);
            FileIOAccess fileIoAccess3 = this.m_append == null ? fileIoPermission.m_append : this.m_append.Union(fileIoPermission.m_append);
            FileIOAccess fileIoAccess4 = this.m_pathDiscovery == null ? fileIoPermission.m_pathDiscovery : this.m_pathDiscovery.Union(fileIoPermission.m_pathDiscovery);
            FileIOAccess fileIoAccess5 = this.m_viewAcl == null ? fileIoPermission.m_viewAcl : this.m_viewAcl.Union(fileIoPermission.m_viewAcl);
            FileIOAccess fileIoAccess6 = this.m_changeAcl == null ? fileIoPermission.m_changeAcl : this.m_changeAcl.Union(fileIoPermission.m_changeAcl);

            if ((fileIoAccess1 == null || fileIoAccess1.IsEmpty()) && (fileIoAccess2 == null || fileIoAccess2.IsEmpty()) && ((fileIoAccess3 == null || fileIoAccess3.IsEmpty()) && (fileIoAccess4 == null || fileIoAccess4.IsEmpty())) && ((fileIoAccess5 == null || fileIoAccess5.IsEmpty()) && (fileIoAccess6 == null || fileIoAccess6.IsEmpty())))
            {
                return((IPermission)null);
            }
            return((IPermission) new FileIOPermission(PermissionState.None)
            {
                m_unrestricted = false, m_read = fileIoAccess1, m_write = fileIoAccess2, m_append = fileIoAccess3, m_pathDiscovery = fileIoAccess4, m_viewAcl = fileIoAccess5, m_changeAcl = fileIoAccess6
            });
        }