How to use LaunchAsync method of PuppeteerSharp.Puppeteer class

Best Puppeteer-sharp code snippet using PuppeteerSharp.Puppeteer.LaunchAsync

SaveWebPage.xaml.cs

Source:SaveWebPage.xaml.cs Github

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...35 try36 {37 await new PuppeteerSharp.BrowserFetcher().DownloadAsync(PuppeteerSharp.BrowserFetcher.DefaultRevision);3839 var browser = await PuppeteerSharp.Puppeteer.LaunchAsync(new PuppeteerSharp.LaunchOptions40 {41 Headless = true42 });4344 var page = await browser.NewPageAsync(); //打开一个新标签45 await page.GoToAsync(this.tbox_Url.Text); //访问页面4647 //设置截图选项48 PuppeteerSharp.ScreenshotOptions screenshotOptions = new PuppeteerSharp.ScreenshotOptions();49 //screenshotOptions.Clip = new PuppeteerSharp.Media.Clip() { Height = 0, Width = 0, X = 0, Y = 0 };//设置截剪区域50 screenshotOptions.FullPage = true; //是否截取整个页面51 screenshotOptions.OmitBackground = false;//是否使用透明背景,而不是默认白色背景52 screenshotOptions.Quality = 100; //截图质量 0-100(png不可用)53 screenshotOptions.Type = PuppeteerSharp.ScreenshotType.Jpeg; //截图格式5455 var fileName = Environment.CurrentDirectory + $"\\download\\{await page.GetTitleAsync()}.jpg";5657 if (System.IO.File.Exists(fileName))58 {59 fileName = fileName.Replace(".jpg", $"{DateTime.Now.ToString("ffff")}.jpg");60 }6162 await page.ScreenshotAsync(fileName, screenshotOptions);6364 if (System.IO.File.Exists(fileName))65 {66 BitmapImage bi = new BitmapImage();67 bi.BeginInit();68 bi.UriSource = new Uri(fileName, UriKind.Absolute);69 bi.EndInit();70 this.image.Source = bi;71 }72 else73 {74 EMessageBox.Show("保存网页截图失败");75 }7677 //在最后记得关闭浏览器及释放资源78 browser.Disconnect();79 browser.Dispose();80 }81 catch(Exception ex)82 {83 EMessageBox.Show(ex.Message);84 }85 }8687 private async void btn_SaveAsPDF_Click(object sender, RoutedEventArgs e)88 {89 //打开网页的操作跟上面是一样的90 try91 {92 await new PuppeteerSharp.BrowserFetcher().DownloadAsync(PuppeteerSharp.BrowserFetcher.DefaultRevision);93 var browser = await PuppeteerSharp.Puppeteer.LaunchAsync(new PuppeteerSharp.LaunchOptions94 {95 Headless = true96 });97 var page = await browser.NewPageAsync(); //打开一个新标签98 await page.GoToAsync(this.tbox_Url.Text); //访问页面99100 //设置PDF选项101 PuppeteerSharp.PdfOptions pdfOptions = new PuppeteerSharp.PdfOptions();102 pdfOptions.DisplayHeaderFooter = false; //是否显示页眉页脚103 pdfOptions.FooterTemplate = ""; //页脚文本104105 var width = await page.EvaluateFunctionAsync<int>("function getWidth(){return document.body.scrollWidth}");106 var height = await page.EvaluateFunctionAsync<int>("function getHeight(){return document.body.scrollHeight}");107 ...

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Form1.cs

Source:Form1.cs Github

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...19 }20 private async void button1_Click(object sender, EventArgs e)21 { 22 await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);23 browser = await Puppeteer.LaunchAsync(new LaunchOptions24 {25 Headless = true26 });27 //如果await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);执行不成功28 //可以手动访问https://commondatastorage.googleapis.com/chromium-browser-snapshots/index.html?prefix=Win_x64/,下载Chromium浏览器,并解压到指定位置29 //再通过以下代码初始化30 /*31 * LaunchOptions options = new LaunchOptions();32 options.Headless = true;33 options.DefaultViewport = null;34 //忽略证书错误35 options.IgnoreHTTPSErrors = true;36 //chromePath就是下载的Chromium浏览器解压的位置 37 options.ExecutablePath = chromePath;38 browser = await Puppeteer.LaunchAsync(options);39 */40 var page = await browser.NewPageAsync();41 await page.GoToAsync(this.textBox1.Text);42 var html = await page.GetContentAsync();43 this.richTextBox1.Text = html;44 }45 private async void button2_Click(object sender, EventArgs e)46 {47 //获取最后的标签页48 var page = (await browser.PagesAsync()).Last();49 var path = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop),"screenshot.jpg");50 //设置截图选项51 ScreenshotOptions screenshotOptions = new ScreenshotOptions();52 //screenshotOptions.Clip = new PuppeteerSharp.Media.Clip() { Height = 0, Width = 0, X = 0, Y = 0 };//设置截剪区域...

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GistGithubService.cs

Source:GistGithubService.cs Github

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...104 private async Task<Uri> GetRedirectCallbackResult(Uri redirectPage)105 {106 var revisionInfo = await browserFetcher107 .DownloadAsync(PuppeteerSharp.BrowserFetcher.DefaultRevision);108 using var browser = await PuppeteerSharp.Puppeteer.LaunchAsync(new PuppeteerSharp.LaunchOptions109 {110 Headless = false,111 LogProcess = true,112 DumpIO = true113 });114 var page = await browser.NewPageAsync();115 var redirectResult = await page.GoToAsync(redirectPage.AbsoluteUri);116 var target = await browser.WaitForTargetAsync(e => e.Url.Contains(gitHubModel.RedirectUrl!));117 return new Uri(target.Url);118 }119 }120}...

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Program.cs

Source:Program.cs Github

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...12 static void Main(string[] args)13 {14 /*15 2020-02-17 Observation before introducing the killing of previous web browser processes:16 LaunchAsync failed if a process from the last run was still present.17 (See report of this issue at https://forum.botengine.org/t/farm-manager-tribal-wars-2-farmbot/3038/32?u=viir)18 Unhandled exception. System.AggregateException: One or more errors occurred. (Failed to launch Chromium! [28592:33396:0217/074915.470:ERROR:cache_util_win.cc(21)] Unable to move the cache: Access is denied. (0x5)19 [28592:33396:0217/074915.471:ERROR:cache_util.cc(141)] Unable to move cache folder C:\Users\John\AppData\Local\bot\web-browser\user-data\ShaderCache\GPUCache to C:\Users\John\AppData\Local\bot\web-browser\user-data\ShaderCache\old_GPUCache_00020 [28592:33396:0217/074915.471:ERROR:disk_cache.cc(178)] Unable to create cache21 [28592:33396:0217/074915.471:ERROR:shader_disk_cache.cc(601)] Shader Cache Creation failed: -222 [28592:33396:0217/074915.473:ERROR:browser_gpu_channel_host_factory.cc(138)] Failed to launch GPU process.23 )24 ---> PuppeteerSharp.ChromiumProcessException: Failed to launch Chromium! [28592:33396:0217/074915.470:ERROR:cache_util_win.cc(21)] Unable to move the cache: Access is denied. (0x5)25 [28592:33396:0217/074915.471:ERROR:cache_util.cc(141)] Unable to move cache folder C:\Users\John\AppData\Local\bot\web-browser\user-data\ShaderCache\GPUCache to C:\Users\John\AppData\Local\bot\web-browser\user-data\ShaderCache\old_GPUCache_00026 [28592:33396:0217/074915.471:ERROR:disk_cache.cc(178)] Unable to create cache27 [28592:33396:0217/074915.471:ERROR:shader_disk_cache.cc(601)] Shader Cache Creation failed: -228 [28592:33396:0217/074915.473:ERROR:browser_gpu_channel_host_factory.cc(138)] Failed to launch GPU process.29 at PuppeteerSharp.ChromiumProcess.State.StartingState.StartCoreAsync(ChromiumProcess p)30 at PuppeteerSharp.ChromiumProcess.State.StartingState.StartCoreAsync(ChromiumProcess p)31 at PuppeteerSharp.Launcher.LaunchAsync(LaunchOptions options)32 at PuppeteerSharp.Launcher.LaunchAsync(LaunchOptions options)33 */34 KillPreviousWebBrowserProcesses();35 StartWebBrowser().Wait();36 }37 static void KillPreviousWebBrowserProcesses()38 {39 var matchingProcesses =40 System.Diagnostics.Process.GetProcesses()41 /*42 2020-02-1743 .Where(process => process.StartInfo.Arguments.Contains(UserDataDirPath(), StringComparison.InvariantCultureIgnoreCase))44 */45 .Where(ProcessIsWebBrowser)46 .ToList();47 foreach (var process in matchingProcesses)48 {49 if (process.HasExited)50 continue;51 process.Kill();52 }53 }54 static bool ProcessIsWebBrowser(System.Diagnostics.Process process)55 {56 try57 {58 return process.MainModule.FileName.Contains(".local-chromium");59 }60 catch61 {62 return false;63 }64 }65 static async System.Threading.Tasks.Task StartWebBrowser()66 {67 await new PuppeteerSharp.BrowserFetcher().DownloadAsync(PuppeteerSharp.BrowserFetcher.DefaultRevision);68 browser = await PuppeteerSharp.Puppeteer.LaunchAsync(new PuppeteerSharp.LaunchOptions69 {70 Headless = false,71 UserDataDir = UserDataDirPath(),72 DefaultViewport = null,73 });74 browserPage = (await browser.PagesAsync()).FirstOrDefault() ?? await browser.NewPageAsync();75 await browserPage.ExposeFunctionAsync("____callback____", (string returnValue) =>76 {77 callbackFromBrowserDelegate?.Invoke(returnValue);78 return 0;79 });80 }81 }82}...

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PuppeteerGenerator.cs

Source:PuppeteerGenerator.cs Github

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...29 var options = new LaunchOptions {30 Headless = true,31 ExecutablePath = chromePath32 };33 return await Puppeteer.LaunchAsync(options);34 }35 private static void PutBrowser(Browser item) {36 _browsers.Add(item);37 }38 public async Task<Stream> Generate(string htmlSource, bool includeFooters, PdfPageSettings settings) {39 //if (string.IsNullOrEmpty(PuppeteerPath))40 // throw new ArgumentNullException();41 //// check if chromium exists, then download if not42 //var chromePath = Path.Combine(PuppeteerPath, "chrome-win\\chrome.exe");43 //if (!File.Exists(chromePath)) {44 // chromePath = await DownloadPuppeteerToPath(PuppeteerPath);45 //}46 //var options = new LaunchOptions {47 // Headless = true,48 // ExecutablePath = chromePath49 //};50 //using (var browser = await Puppeteer.LaunchAsync(options)) {51 var browser = await GetBrowser();52 try {53 using (var page = await browser.NewPageAsync()) {54 await page.SetContentAsync(htmlSource);55 var result = await page.GetContentAsync();56 var pdfOptions = GetPdfOptions(includeFooters, settings);57 return await page.PdfStreamAsync(pdfOptions);58 }59 } finally {60 PutBrowser(browser);61 }62 //}63 }64 public IPdfGenerator AddHeader(string text, bool isLeft = true) {...

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DocumentsV2Controller.cs

Source:DocumentsV2Controller.cs Github

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...34 return Ok(new { Paths = files.Select(x => "/pdf/" + x), Elapsed = stopwatch.ElapsedMilliseconds });35 }36 [NonAction]37 public async Task<List<string>> GeneratePdfAsync(List<IFormFile> streams, bool landscape) {38 s_browser ??= await Puppeteer.LaunchAsync(_browserOptions);39 var tasks = streams.Select(async x => {40 using (StreamReader stringReader = new StreamReader(x.OpenReadStream()))41 using (var page = await s_browser.NewPageAsync()) {42 await page.SetContentAsync(await stringReader.ReadToEndAsync());43 var fileName = $"{Guid.NewGuid()}.pdf";44 await page.PdfAsync($"{Directory.GetCurrentDirectory()}/files/{fileName}", new PdfOptions() { Format = PuppeteerSharp.Media.PaperFormat.A4, Landscape = landscape, OmitBackground = true, PrintBackground = true });45 return fileName;46 }47 });48 var files = await Task.WhenAll(tasks);49 return files.ToList();50 }51 [NonAction]52 public async Task<List<string>> GeneratePdfAsync(List<string> url, bool landscape) {53 s_browser ??= await Puppeteer.LaunchAsync(_browserOptions);54 var tasks = url.Select(async x => {55 using (var page = await s_browser.NewPageAsync()) {56 await page.GoToAsync(x);57 var fileName = $"{Guid.NewGuid()}.pdf";58 await page.PdfAsync($"{Directory.GetCurrentDirectory()}/files/{fileName}", new PdfOptions() { Format = PuppeteerSharp.Media.PaperFormat.A4, Landscape = landscape, OmitBackground = true, PrintBackground = true });59 return fileName;60 }61 });62 var files = await Task.WhenAll(tasks);63 return files.ToList();64 }65 }66}...

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PuppeteerUtility.csx

Source:PuppeteerUtility.csx Github

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...8 }9 return chromeProcs.First().Modules[0].FileName;10 }11 public async static Task<PageResult> GetPage(){12 var browser = await Puppeteer.LaunchAsync(new LaunchOptions13 {14 Headless = false,15 ExecutablePath = findChrome(),16 Args = new[]{ "--app=http://localhost/null" }17 });18 var page = (await browser.PagesAsync())[0];19 //await page.WaitForNavigationAsync();20 return new PageResult{21 Browser = browser, // they may need the browser to close it after they are done22 Page = page23 };24 }25 26}...

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PuppeteerDocumentGenerator.cs

Source:PuppeteerDocumentGenerator.cs Github

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...7 {8 public async Task<byte[]> Generate(string html)9 {10 await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);11 var browser = await Puppeteer.LaunchAsync(new LaunchOptions12 {13 Headless = true,14 // If needed, we can specify a specific version of Chrome15 //ExecutablePath = @"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe",16 //IgnoredDefaultArgs = new string[] { "--disable-extensions" },17 //IgnoreDefaultArgs = true,18 });19 using (var page = await browser.NewPageAsync())20 {21 await page.SetContentAsync(html);22 var pdfData = await page.PdfDataAsync(new PdfOptions23 {24 MarginOptions = new MarginOptions25 {...

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LaunchAsync

Using AI Code Generation

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 var browser = await Puppeteer.LaunchAsync(new LaunchOptions9 {10 });11 var page = await browser.NewPageAsync();12 }13 }14}15using System;16using System.Threading.Tasks;17using PuppeteerSharp;18{19 {20 static async Task Main(string[] args)21 {22 var browser = await Puppeteer.LaunchAsync(new LaunchOptions23 {24 {25 }26 });27 var page = await browser.NewPageAsync();28 }29 }30}31using System;32using System.Threading.Tasks;33using PuppeteerSharp;34{35 {36 static async Task Main(string[] args)37 {38 var browser = await Puppeteer.LaunchAsync(new LaunchOptions39 {40 {41 }42 });43 var page = await browser.NewPageAsync();

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LaunchAsync

Using AI Code Generation

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1var browser = await Puppeteer.LaunchAsync(new LaunchOptions2{3 Args = new string[] { "--no-sandbox" }4});5var page = await browser.NewPageAsync();6await page.ScreenshotAsync("google.png");7var browser = await Puppeteer.LaunchAsync(new LaunchOptions8{9 Args = new string[] { "--no-sandbox" }10});11var page = await browser.NewPageAsync();12await page.ScreenshotAsync("google.png");13var browser = await Puppeteer.LaunchAsync(new LaunchOptions14{15 Args = new string[] { "--no-sandbox" }16});17var page = await browser.NewPageAsync();18await page.ScreenshotAsync("google.png");19var browser = await Puppeteer.LaunchAsync(new LaunchOptions20{21 Args = new string[] { "--no-sandbox" }22});23var page = await browser.NewPageAsync();24await page.ScreenshotAsync("google.png");25var browser = await Puppeteer.LaunchAsync(new LaunchOptions26{27 Args = new string[] { "--no-sandbox" }28});29var page = await browser.NewPageAsync();30await page.ScreenshotAsync("google.png");31var browser = await Puppeteer.LaunchAsync(new LaunchOptions32{33 Args = new string[] { "--no-sandbox" }34});35var page = await browser.NewPageAsync();36await page.ScreenshotAsync("google.png

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LaunchAsync

Using AI Code Generation

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1var browser = await Puppeteer.LaunchAsync(new LaunchOptions2{3 ExecutablePath = @"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe"4});5var page = await browser.NewPageAsync();6await page.ScreenshotAsync("google.png");7await browser.CloseAsync();8var browser = await Puppeteer.LaunchAsync(new LaunchOptions9{10 ExecutablePath = @"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe"11});12var page = await browser.NewPageAsync();13await page.ScreenshotAsync("google.png");14await browser.CloseAsync();15var browser = await Puppeteer.LaunchAsync(new LaunchOptions16{17 ExecutablePath = @"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe"18});19var page = await browser.NewPageAsync();20await page.ScreenshotAsync("google.png");21await browser.CloseAsync();22var browser = await Puppeteer.LaunchAsync(new LaunchOptions23{24 ExecutablePath = @"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe"25});26var page = await browser.NewPageAsync();27await page.ScreenshotAsync("google.png");28await browser.CloseAsync();29var browser = await Puppeteer.LaunchAsync(new LaunchOptions30{31 ExecutablePath = @"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe"32});33var page = await browser.NewPageAsync();34await page.ScreenshotAsync("google.png");35await browser.CloseAsync();

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LaunchAsync

Using AI Code Generation

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1var options = new LaunchOptions { Headless = true };2var browser = await Puppeteer.LaunchAsync(options);3var page = await browser.NewPageAsync();4await page.ScreenshotAsync("screen.png");5var options = new LaunchOptions { Headless = false };6var browser = await Puppeteer.LaunchAsync(options);7var page = await browser.NewPageAsync();8await page.ScreenshotAsync("screen.png");9var options = new LaunchOptions { Headless = false };10var browser = await Puppeteer.LaunchAsync(options);11var page = await browser.NewPageAsync();12await page.ScreenshotAsync("screen.png");13var options = new LaunchOptions { Headless = false };14var browser = await Puppeteer.LaunchAsync(options);15var page = await browser.NewPageAsync();16await page.ScreenshotAsync("screen.png");17var options = new LaunchOptions { Headless = false };18var browser = await Puppeteer.LaunchAsync(options);19var page = await browser.NewPageAsync();20await page.ScreenshotAsync("screen.png");21var options = new LaunchOptions { Headless = false };22var browser = await Puppeteer.LaunchAsync(options);23var page = await browser.NewPageAsync();24await page.ScreenshotAsync("screen.png");25var options = new LaunchOptions { Headless = false };26var browser = await Puppeteer.LaunchAsync(options);27var page = await browser.NewPageAsync();

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LaunchAsync

Using AI Code Generation

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 {9 };10 var browser = await Puppeteer.LaunchAsync(options);11 var page = await browser.NewPageAsync();12 await page.ScreenshotAsync("screenshot.png");13 await browser.CloseAsync();14 }15 }16}

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LaunchAsync

Using AI Code Generation

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1{2 Args = new[] { "--no-sandbox" }3};4var browser = await Puppeteer.LaunchAsync(options);5var page = await browser.NewPageAsync();6await page.ScreenshotAsync("google.png");7await browser.CloseAsync();8{9 Args = new[] { "--no-sandbox" }10};11var browser = await Puppeteer.LaunchAsync(options);12var page = await browser.NewPageAsync();13await page.ScreenshotAsync("google.png");14await browser.CloseAsync();15{16 Args = new[] { "--no-sandbox" }17};18var browser = await Puppeteer.LaunchAsync(options);19var page = await browser.NewPageAsync();20await page.ScreenshotAsync("google.png");21await browser.CloseAsync();22{23 Args = new[] { "--no-sandbox" }24};25var browser = await Puppeteer.LaunchAsync(options);26var page = await browser.NewPageAsync();27await page.ScreenshotAsync("google.png");28await browser.CloseAsync();29{30 Args = new[] { "--no-sandbox" }31};32var browser = await Puppeteer.LaunchAsync(options);33var page = await browser.NewPageAsync();34await page.ScreenshotAsync("google.png");35await browser.CloseAsync();36{

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LaunchAsync

Using AI Code Generation

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1using PuppeteerSharp;2using System;3using System.Threading.Tasks;4{5 {6 static void Main(string[] args)7 {8 MainAsync().Wait();9 }10 static async Task MainAsync()11 {12 {13 ExecutablePath = @"C:\Program Files (x86)\Google\Chrome\Application\chrome.exe"14 };15 using (var browser = await Puppeteer.LaunchAsync(options))16 using (var page = await browser.NewPageAsync())17 {18 Console.WriteLine(await page.GetContentAsync());19 }20 }21 }22}

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LaunchAsync

Using AI Code Generation

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static void Main(string[] args)7 {8 RunExample().Wait();9 }10 static async Task RunExample()11 {12 var browser = await Puppeteer.LaunchAsync(new LaunchOptions13 {14 });15 var page = await browser.NewPageAsync();16 await page.ScreenshotAsync("google.png");17 await browser.CloseAsync();18 }19 }20}21using System;22using System.Threading.Tasks;23using PuppeteerSharp;24{25 {26 static void Main(string[] args)27 {28 RunExample().Wait();29 }30 static async Task RunExample()31 {32 var browser = await Puppeteer.LaunchAsync(new LaunchOptions33 {34 });35 var page = await browser.NewPageAsync();36 await page.ScreenshotAsync("google.png");37 await browser.CloseAsync();38 }39 }40}41using System;42using System.Threading.Tasks;43using PuppeteerSharp;44{45 {46 static void Main(string[]

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LaunchAsync

Using AI Code Generation

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1using System.IO;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 var browser = await Puppeteer.LaunchAsync(new LaunchOptions9 {10 });11 var page = await browser.NewPageAsync();12 await page.ScreenshotAsync("2.png");13 await browser.CloseAsync();14 }15 }16}17using System.IO;18using System.Threading.Tasks;19using PuppeteerSharp;20{21 {22 static async Task Main(string[] args)23 {24 var browser = await Puppeteer.LaunchAsync(new LaunchOptions25 {26 });27 var page = await browser.NewPageAsync();28 await page.ScreenshotAsync("3.png");29 await browser.CloseAsync();30 }31 }32}33using System.IO;34using System.Threading.Tasks;35using PuppeteerSharp;36{37 {38 static async Task Main(string[] args)39 {40 var browser = await Puppeteer.LaunchAsync(new LaunchOptions41 {42 });43 var page = await browser.NewPageAsync();44 await page.ScreenshotAsync("4.png");45 await browser.CloseAsync();46 }47 }

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