System.Net.WebSockets.WebSocketBase.GetMessageType C# (CSharp) Method

        private static WebSocketMessageType GetMessageType(WebSocketProtocolComponent.BufferType bufferType)
        {
            switch (bufferType)
            {
                case WebSocketProtocolComponent.BufferType.Close:
                    return WebSocketMessageType.Close;
                case WebSocketProtocolComponent.BufferType.BinaryFragment:
                case WebSocketProtocolComponent.BufferType.BinaryMessage:
                    return WebSocketMessageType.Binary;
                case WebSocketProtocolComponent.BufferType.UTF8Fragment:
                case WebSocketProtocolComponent.BufferType.UTF8Message:
                    return WebSocketMessageType.Text;
                default:
                    // This indicates a contract violation of the websocket protocol component,
                    // because we currently don't support any WebSocket extensions and would
                    // not accept a Websocket handshake requesting extensions
                    Debug.Assert(false,
                    string.Format(CultureInfo.InvariantCulture,
                        "The value of 'bufferType' ({0}) is invalid. Valid buffer types: {1}, {2}, {3}, {4}, {5}.",
                        bufferType,
                        WebSocketProtocolComponent.BufferType.Close,
                        WebSocketProtocolComponent.BufferType.BinaryFragment,
                        WebSocketProtocolComponent.BufferType.BinaryMessage,
                        WebSocketProtocolComponent.BufferType.UTF8Fragment,
                        WebSocketProtocolComponent.BufferType.UTF8Message));

                    throw new WebSocketException(WebSocketError.NativeError,
                        SR.Format(SR.net_WebSockets_InvalidBufferType,
                            bufferType,
                            WebSocketProtocolComponent.BufferType.Close,
                            WebSocketProtocolComponent.BufferType.BinaryFragment,
                            WebSocketProtocolComponent.BufferType.BinaryMessage,
                            WebSocketProtocolComponent.BufferType.UTF8Fragment,
                            WebSocketProtocolComponent.BufferType.UTF8Message));
            }
        }