CSharp Async Await Explained: Parallel Processing Tutorial

Pubblicato il: 28 gennaio 2024
sul canale di: Tech Expert Tutorials

Learn how to use async and await statements in c#:

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Code:
using System;
using System.IO;
using System.Threading.Tasks;
using System.Threading;
using System.Net.Http;
using System.Collections.Generic;
using System.Diagnostics;

namespace AsyncAwaitDemo
{
class Program
{
// need to use async Task instead of void to handle async calls
// static void Main(string[], args)
// Task is accessed from here - using System.Threading.Tasks;
static async Task Main(string[] args)
{
Stopwatch sw = new Stopwatch();
sw.Start();
string URL = "https://raw.githubusercontent.com/don...";
// option 1
var tasks = new List Task { RunAsyncTask(), RunAsyncTask("sample.txt"), RunAsyncTask2(URL) };
await Task.WhenAll(tasks);
Console.WriteLine("********************************************************************");
await RunAsyncTask();
string returnText2 = await RunAsyncTask("sample.txt");
Console.WriteLine($"Extracted text from url using version b:\n{returnText2}");
await RunAsyncTask2(URL);
sw.Stop();
Console.WriteLine($"Code ran in {sw.Elapsed.TotalSeconds} seconds");

}
// example without return statement
static async Task RunAsyncTask()
{
Console.WriteLine("Running Task 1 version a ...");
string sampleText = await File.ReadAllTextAsync("sample.txt");
Console.WriteLine($"Extracted Text from local file using version a:\n{sampleText}");
}
// using method overloading - this example returns a string from the method
static async Task string RunAsyncTask(string file_name)
{
Console.WriteLine("Running Task 1 version b ...");
string sampleText = await File.ReadAllTextAsync(file_name);
//Console.WriteLine($"Extracted text from url using version b:\n{sampleText}");
return sampleText;
}
// example using HttpClient from here - using System.Net.Http
static async Task RunAsyncTask2(string URL)
{
Console.WriteLine("Running Task 2 ...");
using(var httpClient = new HttpClient())
{
string result = await httpClient.GetStringAsync(URL);
Console.WriteLine($"Extracted text from url:\n{result}");
}
}
}
}

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