Question 86882 in ASP.NET Question posted in
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How to repeat async call? – Asp.net

I have a program which does a simple http get in an async call and writes it to the console:

using System;
using System.Threading.Tasks;
using System.Net.Http;
using System.Net.Http.Headers;

namespace Hello 
{
    class Program
    {
        private static readonly HttpClient client = new HttpClient();
       static async Task Main(string[] args)
        {
            await ProcessRepositories();
        }
        private static async Task ProcessRepositories()
        {
            client.DefaultRequestHeaders.Accept.Clear();
            var stringTask = client.GetStringAsync("https://localhost:8080");
            var msg = await stringTask;
            Console.Write(msg);                
        }
    }
}

How could I repeat the whole process to make it write it to the console until a button is pressed?

Tags:

3

Answers


  1. 0 
    class Program
{
    private static readonly HttpClient client = new HttpClient();
    static async Task Main(string[] args)
    {
        while (true)
        {
            var consoleKey = Console.ReadKey().Key;
            if (consoleKey == ConsoleKey.Enter) // if pressed Enter
                await ProcessRepositories();
            else if (consoleKey == ConsoleKey.Escape) // if pressed Esc
                break;
        }

        Console.WriteLine("Finish");
    }

    private static async Task ProcessRepositories()
    {
        client.DefaultRequestHeaders.Clear(); // idk why you cleaning headers, but OK
        Console.Write(await client.GetStringAsync("https://localhost:8080"));
    }
}
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  2. 0

    You can use Polly library for such calls. Do not use infinity loop, it is bad practice.

    Here is an example about retry with exponential backoff.

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  3. 0

    To keep processing data until a key is pressed;

    private static readonly HttpClient client = new HttpClient();

public static async Task Main(string[] args)
{
    var tokenSource = new CancellationTokenSource();
    var process = ProcessRepositories(tokenSource.Token);

    Console.ReadKey();

    tokenSource.Cancel();
    try
    {
        await process;
    }
    catch (OperationCanceledException) { }
}

private static async Task ProcessRepositories(CancellationToken token = default)
{
    while (!token.IsCancellationRequested)
    {
        Console.Write(await client.GetStringAsync("https://localhost:8080", token));
        await Task.Delay(30_000);
    }
}
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