ServiceStack.CompressionTypes.IsValid C# (CSharp) Метод

        public static bool IsValid(string compressionType)
        {
            return compressionType == Deflate || compressionType == GZip;
        }

        public CompressedFileResult(string filePath, string compressionType, string contentMimeType)
        {
            if (!CompressionTypes.IsValid(compressionType))
            {
                throw new ArgumentException(@"Must be either 'deflate' or 'gzip'", compressionType);
            }

            this.FilePath = filePath;
            this.Headers  = new Dictionary <string, string> {
                { HttpHeaders.ContentType, contentMimeType },
                { HttpHeaders.ContentEncoding, compressionType },
            };
        }