C#实现EDI请求的示例代码，按照FFTIN格式实现EDI请求交互，数据内容长度分部为2,1,3,10,35,35。

下面是一个简单的C#示例代码，用于按照FFTIN格式实现EDI请求交互：

using System;
using System.IO;
using System.Net.Sockets;
using System.Text;

public class EdiRequest
{
    public static void Main()
    {
        string host = "example.com";
        int port = 1234;

        try
        {
            // Connect to the server
            TcpClient client = new TcpClient(host, port);

            // Get the network stream
            NetworkStream stream = client.GetStream();

            // Construct the data to be sent
            string data = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
            string[] lengths = { "02", "01", "03", "10", "35", "35" };
            StringBuilder request = new StringBuilder("FFTIN");

            for (int i = 0; i < lengths.Length; i++)
            {
                request.Append(lengths[i]);
                request.Append(data.Substring(0, int.Parse(lengths[i])));
                data = data.Substring(int.Parse(lengths[i]));
            }

            // Convert the request string to bytes and send it
            byte[] bytes = Encoding.ASCII.GetBytes(request.ToString());
            stream.Write(bytes, 0, bytes.Length);

            // Receive the response from the server
            bytes = new byte[client.ReceiveBufferSize];
            int bytesRead = stream.Read(bytes, 0, client.ReceiveBufferSize);
            string response = Encoding.ASCII.GetString(bytes, 0, bytesRead);

            Console.WriteLine("Response received: {0}", response);

            // Close the connection
            client.Close();
        }
        catch (Exception e)
        {
            Console.WriteLine("Exception: {0}", e);
        }
    }
}

这段代码假设您已经知道要连接的服务器的主机名和端口号，并且数据内容已经准备好。它使用TCP客户端连接到服务器，并将EDI请求发送到服务器。在请求的构造过程中，使用了字符串长度和数据内容，这些数据按照FFTIN格式分别为2、1、3、10、35和35个字符。请求发送后，代码从服务器接收响应并在控制台上显示它。最后，客户端关闭连接。