create a async udp server with tokio in csharp

To create an async UDP server with Tokio in C#, you can follow these steps:

Start by creating a new C# console application in Visual Studio.
Add the tokio package to your project using NuGet Package Manager.
Import the necessary namespaces: System.Net.Sockets, System.Threading.Tasks, and Tokio.
Create a new UdpClient object to listen for incoming UDP datagrams on a specific port. You can do this using the BindAsync method of the UdpClient class.


main.cs
var udpClient = new UdpClient();
await udpClient.BindAsync(new IPEndPoint(IPAddress.Any, 12345));
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Create a new TokioExecutor object to schedule asynchronous tasks on a Tokio runtime. You can do this using the TokioExecutor.FromCurrentSynchronizationContext method.


main.cs
var tokioExecutor = TokioExecutor.FromCurrentSynchronizationContext();
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Write a method to receive and handle incoming UDP datagrams. This method should take a UdpReceiveResult object as a parameter and return a Task.


main.cs
async Task HandleDatagramAsync(UdpReceiveResult datagram)
{
    // Process the incoming datagram
    // ...
}
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Create an infinite loop to listen for incoming UDP datagrams and schedule a new asynchronous task to handle each incoming datagram. You can do this using the ReceiveAsync method of the UdpClient class and the TokioExecutor object created earlier.


main.cs
while (true)
{
    var datagram = await udpClient.ReceiveAsync();
    await tokioExecutor.Schedule(HandleDatagramAsync, datagram);
}
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Here's the full code:


main.cs
using System;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;
using Tokio;

class Program
{
    static async Task Main(string[] args)
    {
        var udpClient = new UdpClient();
        await udpClient.BindAsync(new IPEndPoint(IPAddress.Any, 12345));

        var tokioExecutor = TokioExecutor.FromCurrentSynchronizationContext();

        async Task HandleDatagramAsync(UdpReceiveResult datagram)
        {
            // Process the incoming datagram
            Console.WriteLine($"Received {datagram.Buffer.Length} bytes from {datagram.RemoteEndPoint}");
        }

        while (true)
        {
            var datagram = await udpClient.ReceiveAsync();
            await tokioExecutor.Schedule(HandleDatagramAsync, datagram);
        }
    }
}
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