A Telnet Example

zh (CN)
v1.6 v2.0 v1.5

Keywords: Telnet, Console Project, References

Prerequisites

Make sure you have installed the latest .NET Core SDK (3.0 or above version)

Create a Console project and add references of SuperSocket (targets to netcoreapp3.0)

dotnet new console
dotnet add package SuperSocket.Server --version 2.0.0-*

Using the namespaces of SuperSocket and other namespaces you might need

using System.Threading.Tasks;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using SuperSocket;
using SuperSocket.ProtoBase;

Write the code about SuperSocket host startup in the Main method

static async Task Main(string[] args)
{
    var host = ...;
    ...
    await host.RunAsync();
}

Create the host

var host = SuperSocketHostBuilder.Create<StringPackageInfo, CommandLinePipelineFilter>()

Create the SuperSocket host with the package type and the pipeline filter type.

Register package handler which processes incoming data

.UsePackageHandler(async (session, package) =>
{
    var result = 0;

    switch (package.Key.ToUpper())
    {
        case ("ADD"):
            result = package.Parameters
                .Select(p => int.Parse(p))
                .Sum();
            break;

        case ("SUB"):
            result = package.Parameters
                .Select(p => int.Parse(p))
                .Aggregate((x, y) => x - y);
            break;

        case ("MULT"):
            result = package.Parameters
                .Select(p => int.Parse(p))
                .Aggregate((x, y) => x * y);
            break;
    }

    await session.SendAsync(Encoding.UTF8.GetBytes(result.ToString() + "\r\n"));
})

Send the received text back to the clinet.

Configure logging

.ConfigureLogging((hostCtx, loggingBuilder) =>
{
    loggingBuilder.AddConsole();
})

Enable the console output only. You also can register your own thirdparty logging library over here.

Configure server's information like name and listening endpoint adn build the host

.ConfigureSuperSocket(options =>
{
    options.Name = "Echo Server";
    options.Listeners = new [] {
        new ListenOptions
        {
            Ip = "Any",
            Port = 4040
        }
    };
}).Build();

Start the host

await host.RunAsync();