how to send file by .net 5 tcpclient

Question

I code xamarin.forms project.
I have view the page(https://learn.microsoft.com/en-us/dotnet/api/system.net.sockets.tcpclient?view=net-5.0).
The example is send message by tcpclient.
I don't know how to read a file and send file by tcpclient.
Can you please give me a example?
Thank you.

Answer 1

This is another simple example of using TCP, I hope it can provide you with some ideas.

Server:

        static void Main(string[] args)  
        {  
            ReceiveTCP(8088);  
        }  
        private const int BufferSize = 1024;  
        public static void ReceiveTCP(int port)  
        {  
            TcpListener Listener = null;  
            try  
            {  
                Listener = new TcpListener(IPAddress.Any, port);  
                Listener.Start();  
            }  
            catch (Exception ex)  
            {  
                Console.WriteLine(ex.Message);  
            }  
            byte[] RecData = new byte[BufferSize];  
            int RecBytes;  
            for (; ; )  
            {  
                TcpClient client = null;  
                NetworkStream netstream = null;  
                try  
                {  
                    client = Listener.AcceptTcpClient();  
                    netstream = client.GetStream();  
                    Console.WriteLine("Connected to a client...");  
  
                    string SaveFileName = @"C:\xxx\2.docx";  
  
                    int totalrecbytes = 0;  
                    using (FileStream Fs = new FileStream(SaveFileName, FileMode.OpenOrCreate, FileAccess.Write))  
                    {  
                        while ((RecBytes = netstream.Read(RecData, 0, RecData.Length)) > 0)  
                        {  
                            Fs.Write(RecData, 0, RecBytes);  
                            totalrecbytes += RecBytes;  
                        }  
                    }    
                }  
                catch (Exception ex)  
                {  
                    Console.WriteLine(ex.Message);  
                }  
                finally   
                {  
                    netstream.Close();  
                    client.Close();  
                }  
            }  
        }  

Client:

       private const int BufferSize = 1024;  
        static void Main(string[] args)  
        {  
            SendTCP(@"d:\xxx\test.docx", "localhost", 8088);  
        }  
        public static void SendTCP(string fileName, string ip, Int32 port)  
        {  
            byte[] SendingBuffer = null;  
            TcpClient client = null;  
            NetworkStream netstream = null;  
            try  
            {  
                client = new TcpClient(ip, port);  
                Console.WriteLine("Connected to the Server...");  
                netstream = client.GetStream();  
                FileStream Fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);  
                int NoOfPackets = Convert.ToInt32  
               (Math.Ceiling(Convert.ToDouble(Fs.Length) / Convert.ToDouble(BufferSize)));  
                int TotalLength = (int)Fs.Length, CurrentPacketLength;  
                for (int i = 0; i < NoOfPackets; i++)  
                {  
                    if (TotalLength > BufferSize)  
                    {  
                        CurrentPacketLength = BufferSize;  
                        TotalLength = TotalLength - CurrentPacketLength;  
                    }  
                    else  
                        CurrentPacketLength = TotalLength;  
                    SendingBuffer = new byte[CurrentPacketLength];  
                    Fs.Read(SendingBuffer, 0, CurrentPacketLength);  
                    netstream.Write(SendingBuffer, 0, (int)SendingBuffer.Length);  
                }  
                Console.WriteLine("Sent " + Fs.Length.ToString() + "bytes to the server");  
                Fs.Close();  
            }  
            catch (Exception ex)  
            {  
                Console.WriteLine(ex.Message);  
            }  
            finally  
            {  
                netstream.Close();  
                client.Close();  
            }  
        }  

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Answer 2

Do you need to use TcpClient/Sockets specifically? If not you can just use HttpClient - here's a pretty good tutorial demonstrates it:
https://www.youtube.com/watch?v=KPDGtLeNClQ

Example client:
https://github.com/jfversluis/XFUploadFile/blob/main/XFUploadFile/MainPage.xaml.cs#L30

Example server:
https://github.com/jfversluis/XFUploadFile/blob/main/XFUploadFile.Server/Controllers/UploadFileController.cs#L36