C#•10mo ago

✅ I cant start playwright browser

I cannot run the browser on Playwright, my code closes without throwing an error. code https://hatebin.com/rovbvubawd

7 Replies

I think it's probably related to you having a non-async Main calling an async method e.g.:

using Microsoft.Playwright;
using System.Diagnostics;

namespace ConsoleApp1
{
    internal class Program
    {
        static async Task Main()
        {
            await Test();
        }

        static async Task Test()
        {
            Console.WriteLine("Started");

            using var playwright = await Playwright.CreateAsync();
            await using var browser = await playwright.Firefox.LaunchAsync(new() { Headless = false });
            var page = await browser.NewPageAsync();

            await page.GotoAsync("https://ipv4.icanhazip.com/");
            await page.ScreenshotAsync(new() { Path = "screenshot.png" });

            Process.Start("screenshot.png");
            Console.WriteLine("Finished");
        }
    }
}

using Microsoft.Playwright;
using System.Diagnostics;

namespace ConsoleApp1
{
    internal class Program
    {
        static async Task Main()
        {
            await Test();
        }

        static async Task Test()
        {
            Console.WriteLine("Started");

            using var playwright = await Playwright.CreateAsync();
            await using var browser = await playwright.Firefox.LaunchAsync(new() { Headless = false });
            var page = await browser.NewPageAsync();

            await page.GotoAsync("https://ipv4.icanhazip.com/");
            await page.ScreenshotAsync(new() { Path = "screenshot.png" });

            Process.Start("screenshot.png");
            Console.WriteLine("Finished");
        }
    }
}

and see if it runs

Unknown User•10mo ago

Message Not Public

AntiDevOP•10mo ago

But Console.writeline at the end not working that worked thx i dont know main function can be a task

SinFluxx•10mo ago

$mains

MODiX•10mo ago

The possible signatures for Main are

public static void Main() { }
public static int Main() { }
public static void Main(string[] args) { }
public static int Main(string[] args) { }
public static async Task Main() { }
public static async Task<int> Main() { }
public static async Task Main(string[] args) { }
public static async Task<int> Main(string[] args) { }

public static void Main() { }
public static int Main() { }
public static void Main(string[] args) { }
public static int Main(string[] args) { }
public static async Task Main() { }
public static async Task<int> Main() { }
public static async Task Main(string[] args) { }
public static async Task<int> Main(string[] args) { }

public is not required (can be any accessibility). Top-level statements are compiled into a Main method and will use an appropriate signature depending on the body. https://docs.microsoft.com/en-US/dotnet/csharp/fundamentals/program-structure/main-command-line

Main() and command-line arguments - C#

Learn about Main() and command-line arguments. The 'Main' method is the entry point of an executable program.

Unknown User•10mo ago

Message Not Public

MODiX•10mo ago

TLDR on async/await: * every .net API that is suffixed with Async (eg: .Read() and .ReadAsync()) => use the Async version * if the API name ends with Async => await it * if the API returns a Task => await it * if you have to await in a method: * that method must have the async keyword (you could even suffix your function name with Async, up to you) * if it was returning T (eg:string) => it should now return Task<T> (eg: Task<string>) * APIs to ban and associated fix:

var r = t.Result;                   /* ===> */ var r = await t;
t.Wait();                           /* ===> */ await t;
var r = t.GetAwaiter().GetResult(); /* ===> */ var r = await t;
Task.WaitAll(t1, t2);               /* ===> */ await Task.WhenAll(t1, t2);

var r = t.Result;                   /* ===> */ var r = await t;
t.Wait();                           /* ===> */ await t;
var r = t.GetAwaiter().GetResult(); /* ===> */ var r = await t;
Task.WaitAll(t1, t2);               /* ===> */ await Task.WhenAll(t1, t2);

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✅ I cant start playwright browser