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How to use StartAsync method of PuppeteerSharp.Tracing class

Best Puppeteer-sharp code snippet using PuppeteerSharp.Tracing.StartAsync

Program.cs

Source:Program.cs

...90                var browser = await Puppeteer.LaunchAsync(options).ConfigureAwait(false);91                92                var page = await browser.NewPageAsync().ConfigureAwait(false);93                94                //await page.Tracing.StartAsync(new TracingOptions { Path = "" }).ConfigureAwait(false);95                //await page.Tracing.StopAsync().ConfigureAwait(false);96                //await page.CloseAsync().ConfigureAwait(false);97                var tryLimit = 30;98                var currentTry = 0;99                while (currentTry < tryLimit)100                {101                    while (links.TryDequeue(out var nextUrl))102                    {103                        currentTry = 0;104                        try105                        {106                            logger.LogInformation("{threadId} Getting url {nextUrl}", threadId, nextUrl);107                            Response? pageNav = null;108                            var tries = 0;...

Scrape.cs

Source:Scrape.cs

...49                {50                    Width = width,51                    Height = height52                });53                await page.Tracing.StartAsync(new TracingOptions54                {55                    Categories = new List<string> { "devtools.timeline" }56                });57                var client = await page.Target.CreateCDPSessionAsync();58                await client.SendAsync("Network.clearBrowserCache");59                await page.GoToAsync(url, timeout: 0);60                string rawTrace = await page.Tracing.StopAsync();61                string content = await page.GetContentAsync();62                //Image63                var imageElements = await page.QuerySelectorAllAsync("img");64                if (imageElements != null)65                {66                    imageCount = imageElements.Count();67                    imageProperties = await new ImageHelper().GetImageData(imageElements);...

TracingTests.cs

Source:TracingTests.cs

...49        [PuppeteerTest("tracing.spec.ts", "Tracing", "should output a trace")]50        [SkipBrowserFact(skipFirefox: true)]51        public async Task ShouldOutputATrace()52        {53            await Page.Tracing.StartAsync(new TracingOptions54            {55                Screenshots = true,56                Path = _file57            });58            await Page.GoToAsync(TestConstants.ServerUrl + "/grid.html");59            await Page.Tracing.StopAsync();60            Assert.True(File.Exists(_file));61        }62        [PuppeteerTest("tracing.spec.ts", "Tracing", "should run with custom categories if provided")]63        [SkipBrowserFact(skipFirefox: true)]64        public async Task ShouldRunWithCustomCategoriesProvided()65        {66            await Page.Tracing.StartAsync(new TracingOptions67            {68                Screenshots = true,69                Path = _file,70                Categories = new List<string>71                {72                    "disabled-by-default-v8.cpu_profiler.hires"73                }74            });75            await Page.Tracing.StopAsync();76            using (var file = File.OpenText(_file))77            using (var reader = new JsonTextReader(file))78            {79                var traceJson = JToken.ReadFrom(reader);80                Assert.Contains("disabled-by-default-v8.cpu_profiler.hires", traceJson["metadata"]["trace-config"].ToString());81            }82        }83        [PuppeteerTest("tracing.spec.ts", "Tracing", "should throw if tracing on two pages")]84        [SkipBrowserFact(skipFirefox: true)]85        public async Task ShouldThrowIfTracingOnTwoPages()86        {87            await Page.Tracing.StartAsync(new TracingOptions88            {89                Path = _file90            });91            var newPage = await Browser.NewPageAsync();92            await Assert.ThrowsAsync<InvalidOperationException>(async () =>93            {94                await Page.Tracing.StartAsync(new TracingOptions95                {96                    Path = _file97                });98            });99            await newPage.CloseAsync();100            await Page.Tracing.StopAsync();101        }102        [PuppeteerTest("tracing.spec.ts", "Tracing", "should return a buffer")]103        [SkipBrowserFact(skipFirefox: true)]104        public async Task ShouldReturnABuffer()105        {106            await Page.Tracing.StartAsync(new TracingOptions107            {108                Screenshots = true,109                Path = _file110            });111            await Page.GoToAsync(TestConstants.ServerUrl + "/grid.html");112            var trace = await Page.Tracing.StopAsync();113            var buf = File.ReadAllText(_file);114            Assert.Equal(trace, buf);115        }116        [PuppeteerTest("tracing.spec.ts", "Tracing", "should work without options")]117        [SkipBrowserFact(skipFirefox: true)]118        public async Task ShouldWorkWithoutOptions()119        {120            await Page.Tracing.StartAsync();121            await Page.GoToAsync(TestConstants.ServerUrl + "/grid.html");122            var trace = await Page.Tracing.StopAsync();123            Assert.NotNull(trace);124        }125        [PuppeteerTest("tracing.spec.ts", "Tracing", "should support a buffer without a path")]126        [SkipBrowserFact(skipFirefox: true)]127        public async Task ShouldSupportABufferWithoutAPath()128        {129            await Page.Tracing.StartAsync(new TracingOptions130            {131                Screenshots = true132            });133            await Page.GoToAsync(TestConstants.ServerUrl + "/grid.html");134            var trace = await Page.Tracing.StopAsync();135            Assert.Contains("screenshot", trace);136        }137    }138}...

Tracing.cs

Source:Tracing.cs

...6using PuppeteerSharp.Messaging;7namespace PuppeteerSharp8{9    /// <summary>10    /// You can use <see cref="Tracing.StartAsync(TracingOptions)"/> and <see cref="Tracing.StopAsync"/> to create a trace file which can be opened in Chrome DevTools or timeline viewer.11    /// </summary>12    /// <example>13    /// <code>14    /// await Page.Tracing.StartAsync(new TracingOptions15    /// {16    ///     Screenshots = true,17    ///     Path = _file18    /// });19    /// await Page.GoToAsync(TestConstants.ServerUrl + "/grid.html");20    /// await Page.Tracing.StopAsync();21    /// </code>22    /// </example>23    public class Tracing24    {25        private readonly CDPSession _client;26        private bool _recording;27        private string _path;28        private static readonly List<string> _defaultCategories = new List<string>29        {30            "-*",31            "devtools.timeline",32            "v8.execute",33            "disabled-by-default-devtools.timeline",34            "disabled-by-default-devtools.timeline.frame",35            "toplevel",36            "blink.console",37            "blink.user_timing",38            "latencyInfo",39            "disabled-by-default-devtools.timeline.stack",40            "disabled-by-default-v8.cpu_profiler"41        };42        internal Tracing(CDPSession client)43        {44            _client = client;45        }46        /// <summary>47        /// Starts tracing.48        /// </summary>49        /// <returns>Start task</returns>50        /// <param name="options">Tracing options</param>51        public Task StartAsync(TracingOptions options)52        {53            if (_recording)54            {55                throw new InvalidOperationException("Cannot start recording trace while already recording trace.");56            }57            var categories = options.Categories ?? _defaultCategories;58            if (options.Screenshots)59            {60                categories.Add("disabled-by-default-devtools.screenshot");61            }62            _path = options.Path;63            _recording = true;64            return _client.SendAsync("Tracing.start", new65            {...

TracingOptions.cs

Source:TracingOptions.cs

1ï»¿using System.Collections.Generic;2namespace PuppeteerSharp3{4    /// <summary>5    /// Tracing options used on <see cref="Tracing.StartAsync(TracingOptions)"/>.6    /// </summary>7    public class TracingOptions8    {9        /// <summary>10        /// Gets or sets a value indicating whether Tracing should captures screenshots in the trace11        /// </summary>12        /// <value>Screenshots option</value>13        public bool Screenshots { get; set; }14        /// <summary>15        /// A path to write the trace file to16        /// </summary>17        /// <value>The path.</value>18        public string Path { get; set; }19        /// <summary>...

StartAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static async Task Main(string[] args)7        {8            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);9            var options = new LaunchOptions { Headless = true };10            using (var browser = await Puppeteer.LaunchAsync(options))11            using (var page = await browser.NewPageAsync())12            {13                var tracing = await page.Tracing.StartAsync(new TracingOptions { Path = "trace.json" });14                await tracing.StopAsync();15            }16        }17    }18}19{20    {21      "args": {22        "data": {23            {24            }25        }26      }27    },28    {29      "args": {30        "data": {31          "request": {32            "headers": {33              "User-Agent": "Mozilla/5.0 (Windows NT 10.0;

StartAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static async Task Main(string[] args)7        {8            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);9            var browser = await Puppeteer.LaunchAsync(new LaunchOptions10            {11                Args = new[] { "--no-sandbox" }12            });13            var page = await browser.NewPageAsync();14            await page.TypeAsync("input[title='Search']", "PuppeteerSharp");15            await page.ClickAsync("input[value='Google Search']");16            await page.WaitForNavigationAsync();17            var trace = await page.Tracing.StartAsync(new TracingOptions18            {19            });20            await page.ClickAsync("a[href='

StartAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static async Task Main(string[] args)7        {8            {9            };10            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);11            var browser = await Puppeteer.LaunchAsync(options);12            var page = await browser.NewPageAsync();13            var tracing = await page.Tracing.StartAsync(new TracingOptions { Path = "trace.json" });14            await tracing.StopAsync();15            await browser.CloseAsync();16        }17    }18}19using System;20using System.Threading.Tasks;21using PuppeteerSharp;22{23    {24        static async Task Main(string[] args)25        {26            {27            };28            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);29            var browser = await Puppeteer.LaunchAsync(options);30            var page = await browser.NewPageAsync();31            var tracing = await page.Tracing.StartAsync(new TracingOptions { Path = "trace.json" });32            await tracing.StopAsync();33            await browser.CloseAsync();34        }35    }36}37using System;38using System.Threading.Tasks;39using PuppeteerSharp;40{41    {42        static async Task Main(string[] args)43        {44            {45            };46            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);47            var browser = await Puppeteer.LaunchAsync(options);48            var page = await browser.NewPageAsync();49            var tracing = await page.Tracing.StartAsync(new TracingOptions { Path = "trace.json

StartAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        public static async Task Main(string[] args)7        {8            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);9            var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });10            var page = await browser.NewPageAsync();11            await page.Tracing.StartAsync(new TracingOptions12            {13                Categories = new[] { "devtools.timeline" }14            });15            await page.EvaluateFunctionAsync("() => alert('Hello World!')");16            await page.Tracing.StopAsync();17            await browser.CloseAsync();18        }19    }20}21using System;22using System.Threading.Tasks;23using PuppeteerSharp;24{25    {26        public static async Task Main(string[] args)27        {28            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);29            var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });30            var page = await browser.NewPageAsync();31            await page.Tracing.StartAsync(new TracingOptions32            {33                Categories = new[] { "devtools.timeline" }34            });35            await page.EvaluateFunctionAsync("() => alert('Hello World!')");36            await page.Tracing.StopAsync();37            await browser.CloseAsync();38        }39    }40}41using System;42using System.Threading.Tasks;43using PuppeteerSharp;44{45    {46        public static async Task Main(string[] args)47        {48            await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);49            var browser = await Puppeteer.LaunchAsync(new LaunchOptions { Headless = true });50            var page = await browser.NewPageAsync();51            await page.Tracing.StartAsync(new TracingOptions52            {

StartAsync

Using AI Code Generation

1using PuppeteerSharp;2using System;3using System.Threading.Tasks;4{5    {6        static async Task Main(string[] args)7        {8            {9            };10            using (var browser = await Puppeteer.LaunchAsync(options))11            using (var page = await browser.NewPageAsync())12            {13                await page.WaitForSelectorAsync("input[name=q]");14                await page.TypeAsync("input[name=q]", "PuppeteerSharp");15                await page.ClickAsync("input[name=btnK]");

StartAsync

Using AI Code Generation

1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5    {6        static async Task Main(string[] args)7        {8            await new BrowserFetcher().DownloadAsync();9            var options = new LaunchOptions { Headless = false };10            using (var browser = await Puppeteer.LaunchAsync(options))11            using (var page = await browser.NewPageAsync())12            {13                var tracing = await browser.StartTracingAsync(new TraceOptions14                {15                    Categories = new string[] { "devtools.timeline" },16                });17                await tracing.StopAsync();18            }19        }20    }21}

StartAsync

Using AI Code Generation

1using System;2using System.IO;3using System.Threading.Tasks;4using PuppeteerSharp;5{6    {7        static async Task Main(string[] args)8        {9            var browser = await Puppeteer.LaunchAsync(new LaunchOptions10            {11                Args = new string[] { "--start-maximized" }12            });13            var page = await browser.NewPageAsync();14            var tracing = await page.Tracing.StartAsync(new TracingOptions15            {16            });17            await tracing.StopAsync();18            var trace = await tracing.GetTraceAsync();19            File.WriteAllText("trace.json", trace);20            var traceBuffer = await tracing.GetTraceBufferAsync();21            File.WriteAllText("trace.json", traceBuffer);22            await tracing.DisposeAsync();23            Console.WriteLine("Done");24        }25    }26}27GetTraceAsync() method returns a Task of string type. The

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