How to use EvaluateExpressionAsync method of PuppeteerSharp.Frame class

Best Puppeteer-sharp code snippet using PuppeteerSharp.Frame.EvaluateExpressionAsync

Methods.cs

Source:Methods.cs Github

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...20 data.Logger.LogHeader();21 var elemScript = GetElementScript(findBy, identifier, index);22 var frame = GetFrame(data);23 var script = elemScript + $".setAttribute('{attributeName}', '{value}');";24 await frame.EvaluateExpressionAsync(script);25 data.Logger.Log($"Set value {value} of attribute {attributeName} by executing {script}", LogColors.DarkSalmon);26 }27 [Block("Types text in an input field", name = "Type")]28 public static async Task PuppeteerTypeElement(BotData data, FindElementBy findBy, string identifier, int index,29 string text, int timeBetweenKeystrokes = 0)30 {31 data.Logger.LogHeader();32 var frame = GetFrame(data);33 var elem = await GetElement(frame, findBy, identifier, index);34 await elem.TypeAsync(text, new PuppeteerSharp.Input.TypeOptions { Delay = timeBetweenKeystrokes });35 data.Logger.Log($"Typed {text}", LogColors.DarkSalmon);36 }37 [Block("Types text in an input field with human-like random delays", name = "Type Human")]38 public static async Task PuppeteerTypeElementHuman(BotData data, FindElementBy findBy, string identifier, int index,39 string text)40 {41 data.Logger.LogHeader();42 var frame = GetFrame(data);43 var elem = await GetElement(frame, findBy, identifier, index);44 foreach (var c in text)45 {46 await elem.TypeAsync(c.ToString());47 await Task.Delay(data.Random.Next(100, 300)); /​/​ Wait between 100 and 300 ms (average human type speed is 60 WPM ~ 360 CPM)48 }49 data.Logger.Log($"Typed {text}", LogColors.DarkSalmon);50 }51 [Block("Clicks an element", name = "Click")]52 public static async Task PuppeteerClick(BotData data, FindElementBy findBy, string identifier, int index,53 PuppeteerSharp.Input.MouseButton mouseButton = PuppeteerSharp.Input.MouseButton.Left, int clickCount = 1,54 int timeBetweenClicks = 0)55 {56 data.Logger.LogHeader();57 var frame = GetFrame(data);58 var elem = await GetElement(frame, findBy, identifier, index);59 await elem.ClickAsync(new PuppeteerSharp.Input.ClickOptions { Button = mouseButton, ClickCount = clickCount, Delay = timeBetweenClicks });60 data.Logger.Log($"Clicked {clickCount} time(s) with {mouseButton} button", LogColors.DarkSalmon);61 }62 [Block("Submits a form", name = "Submit")]63 public static async Task PuppeteerSubmit(BotData data, FindElementBy findBy, string identifier, int index)64 {65 data.Logger.LogHeader();66 var elemScript = GetElementScript(findBy, identifier, index);67 var frame = GetFrame(data);68 var script = elemScript + ".submit();";69 await frame.EvaluateExpressionAsync(script);70 data.Logger.Log($"Submitted the form by executing {script}", LogColors.DarkSalmon);71 }72 [Block("Selects a value in a select element", name = "Select")]73 public static async Task PuppeteerSelect(BotData data, FindElementBy findBy, string identifier, int index, string value)74 {75 data.Logger.LogHeader();76 var frame = GetFrame(data);77 var elem = await GetElement(frame, findBy, identifier, index);78 await elem.SelectAsync(value);79 data.Logger.Log($"Selected value {value}", LogColors.DarkSalmon);80 }81 [Block("Selects a value by index in a select element", name = "Select by Index")]82 public static async Task PuppeteerSelectByIndex(BotData data, FindElementBy findBy, string identifier, int index, int selectionIndex)83 {84 data.Logger.LogHeader();85 var frame = GetFrame(data);86 var elemScript = GetElementScript(findBy, identifier, index);87 var script = elemScript + $".getElementsByTagName('option')[{selectionIndex}].value;";88 var value = (await frame.EvaluateExpressionAsync(script)).ToString();89 var elem = await GetElement(frame, findBy, identifier, index);90 await elem.SelectAsync(value);91 data.Logger.Log($"Selected value {value}", LogColors.DarkSalmon);92 }93 [Block("Selects a value by text in a select element", name = "Select by Text")]94 public static async Task PuppeteerSelectByText(BotData data, FindElementBy findBy, string identifier, int index, string text)95 {96 data.Logger.LogHeader();97 var frame = GetFrame(data);98 var elemScript = GetElementScript(findBy, identifier, index);99 var script = $"el={elemScript};for(let i=0;i<el.options.length;i++){{if(el.options[i].text=='{text}'){{el.selectedIndex = i;break;}}}}";100 await frame.EvaluateExpressionAsync(script);101 data.Logger.Log($"Selected text {text}", LogColors.DarkSalmon);102 }103 [Block("Gets the value of an attribute of an element", name = "Get Attribute Value")]104 public static async Task<string> PuppeteerGetAttributeValue(BotData data, FindElementBy findBy, string identifier, int index,105 string attributeName = "innerText")106 {107 data.Logger.LogHeader();108 var elemScript = GetElementScript(findBy, identifier, index);109 var frame = GetFrame(data);110 var script = $"{elemScript}.{attributeName};";111 var value = await frame.EvaluateExpressionAsync<string>(script);112 data.Logger.Log($"Got value {value} of attribute {attributeName} by executing {script}", LogColors.DarkSalmon);113 return value;114 }115 [Block("Gets the values of an attribute of multiple elements", name = "Get Attribute Value All")]116 public static async Task<List<string>> PuppeteerGetAttributeValueAll(BotData data, FindElementBy findBy, string identifier,117 string attributeName = "innerText")118 {119 data.Logger.LogHeader();120 var elemScript = GetElementsScript(findBy, identifier);121 var frame = GetFrame(data);122 var script = $"Array.prototype.slice.call({elemScript}).map((item) => item.{attributeName})";123 var values = await frame.EvaluateExpressionAsync<string[]>(script);124 data.Logger.Log($"Got {values.Length} values for attribute {attributeName} by executing {script}", LogColors.DarkSalmon);125 return values.ToList();126 }127 [Block("Checks if an element is currently being displayed on the page", name = "Is Displayed")]128 public static async Task<bool> PuppeteerIsDisplayed(BotData data, FindElementBy findBy, string identifier, int index)129 {130 data.Logger.LogHeader();131 var elemScript = GetElementScript(findBy, identifier, index);132 var frame = GetFrame(data);133 var script = $"window.getComputedStyle({elemScript}).display !== 'none';";134 var displayed = await frame.EvaluateExpressionAsync<bool>(script);135 data.Logger.Log($"Found out the element is{(displayed ? "" : " not")} displayed by executing {script}", LogColors.DarkSalmon);136 return displayed;137 }138 [Block("Checks if an element exists on the page", name = "Exists")]139 public static async Task<bool> PuppeteerExists(BotData data, FindElementBy findBy, string identifier, int index)140 {141 data.Logger.LogHeader();142 var elemScript = GetElementScript(findBy, identifier, index);143 var frame = GetFrame(data);144 var script = $"window.getComputedStyle({elemScript}).display !== 'none';";145 try146 {147 var displayed = await frame.EvaluateExpressionAsync<bool>(script);148 data.Logger.Log("The element exists", LogColors.DarkSalmon);149 return true;150 }151 catch152 {153 data.Logger.Log("The element does not exist", LogColors.DarkSalmon);154 return false;155 }156 }157 [Block("Uploads one or more files to the selected element", name = "Upload Files")]158 public static async Task PuppeteerUploadFiles(BotData data, FindElementBy findBy, string identifier, int index, List<string> filePaths)159 {160 data.Logger.LogHeader();161 var frame = GetFrame(data);...

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PuppeteerMethods.cs

Source:PuppeteerMethods.cs Github

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...171 public static async Task<List<string>> VideoLinkList(Page page)172 {173 WaitUntilNavigation[] waitUntil = new[] { WaitUntilNavigation.Networkidle0, WaitUntilNavigation.Networkidle2, WaitUntilNavigation.DOMContentLoaded, WaitUntilNavigation.Load }; 174 var next = @"document.getElementById('pnnext')";175 var nexts = await page.EvaluateExpressionAsync<object>(next);176 var linkList = new List<string>();177 var isLastPage = (nexts == null);178 while ((nexts != null) || !isLastPage)179 {180 var jsSelectAllAnchors = @"Array.from(document.querySelectorAll('.g'))";181 var urls = await page.EvaluateExpressionAsync<object[]>(jsSelectAllAnchors);182 for (int i = 0; i < urls.Length; i++)183 {184 var query = $"document.querySelectorAll('.g')[{i}].getElementsByTagName('a')[0].href";185 linkList.Add(await page.EvaluateExpressionAsync<string>(query));186 }187 nexts = await page.EvaluateExpressionAsync<object>(next);188 if (nexts != null)189 {190 var nextHref = @"document.getElementById('pnnext').href";191 var nextHrefUrl = await page.EvaluateExpressionAsync<string>(nextHref);192 isLastPage = (nexts == null) && !string.IsNullOrEmpty(nextHrefUrl);193 await page.GoToAsync(nextHrefUrl, new NavigationOptions { WaitUntil = waitUntil });194 nexts = await page.EvaluateExpressionAsync<object>(next);195 }196 else197 {198 isLastPage = true;199 }200 }201 return linkList;202 } 203 public static async Task<PuppeteerDataResult<List<string>>> GetVideoSearchVideoResultUrlList(string url, string searchWord)204 {205 using (var page = await OpenChromiumPage())206 {207 WaitUntilNavigation[] waitUntil = new[] { WaitUntilNavigation.Networkidle0, WaitUntilNavigation.Networkidle2, WaitUntilNavigation.DOMContentLoaded, WaitUntilNavigation.Load };208 await page.GoToAsync(url, new NavigationOptions { WaitUntil = waitUntil });209 await SearchOnGoogle(searchWord, page);210 /​/​Click Video Tab211 var videoTabElement = @"document.getElementsByClassName('hdtb-mitem')[4].getElementsByTagName('a')[0].href";212 var videoTabLink = await page.EvaluateExpressionAsync<string>(videoTabElement); 213 await page.GoToAsync(videoTabLink, new NavigationOptions { WaitUntil = waitUntil });214 215 var result= await VideoLinkList(page); 216 return new SuccessPuppeteerDataResult<List<string>>(result, "Get Title Successfully"); 217 }218 }219 public static async Task<PuppeteerDataResult<string>> GetSearchStaticticDetail(string url, string searchWord)220 {221 using (var page = await OpenChromiumPage())222 {223 WaitUntilNavigation[] waitUntil = new[] { WaitUntilNavigation.Networkidle0, WaitUntilNavigation.Networkidle2, WaitUntilNavigation.DOMContentLoaded, WaitUntilNavigation.Load };224 await page.GoToAsync(url, new NavigationOptions { WaitUntil = waitUntil });225 await SearchOnGoogle(searchWord, page);226 var jsExpression = @"document.querySelectorAll('#result-stats')[0].innerHTML";227 var result = await page.EvaluateExpressionAsync<string>(jsExpression);228 return new SuccessPuppeteerDataResult<string>(result, "");229 }230 }231 private static async Task SearchOnGoogle(string searchWord, Page page)232 {233 WaitUntilNavigation[] waitUntil = new[] { WaitUntilNavigation.Networkidle0, WaitUntilNavigation.Networkidle2, WaitUntilNavigation.DOMContentLoaded, WaitUntilNavigation.Load };234 /​/​Search Text Input235 await page.WaitForSelectorAsync("input[name='q']");236 await page.TypeAsync("input[name='q']", searchWord);237 /​/​Search on Google Button and Click Operation238 await page.WaitForSelectorAsync("input[name='btnK']");239 await page.EvaluateExpressionAsync("document.querySelector(\"input[name='btnK']\").click()");240 await page.WaitForNavigationAsync(new NavigationOptions { WaitUntil = waitUntil });241 }242 }243}...

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ExposeFunctionTests.cs

Source:ExposeFunctionTests.cs Github

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...12 [Fact]13 public async Task ShouldWork()14 {15 await Page.ExposeFunctionAsync("compute", (int a, int b) => a * b);16 var result = await Page.EvaluateExpressionAsync<int>("compute(9, 4)");17 Assert.Equal(36, result);18 }19 [Fact]20 public async Task ShouldSurviveNavigation()21 {22 await Page.ExposeFunctionAsync("compute", (int a, int b) => a * b);23 await Page.GoToAsync(TestConstants.EmptyPage);24 var result = await Page.EvaluateExpressionAsync<int>("compute(9, 4)");25 Assert.Equal(36, result);26 }27 [Fact]28 public async Task ShouldAwaitReturnedValueTask()29 {30 await Page.ExposeFunctionAsync("compute", (int a, int b) => Task.FromResult(a * b));31 var result = await Page.EvaluateExpressionAsync<int>("compute(3, 5)");32 Assert.Equal(15, result);33 }34 [Fact]35 public async Task ShouldWorkOnFrames()36 {37 await Page.ExposeFunctionAsync("compute", (int a, int b) => Task.FromResult(a * b));38 await Page.GoToAsync(TestConstants.ServerUrl + "/​frames/​nested-frames.html");39 var frame = Page.Frames[1];40 var result = await frame.EvaluateExpressionAsync<int>("compute(3, 5)");41 Assert.Equal(15, result);42 }43 [Fact]44 public async Task ShouldWorkOnFramesBeforeNavigation()45 {46 await Page.GoToAsync(TestConstants.ServerUrl + "/​frames/​nested-frames.html");47 await Page.ExposeFunctionAsync("compute", (int a, int b) => Task.FromResult(a * b));48 var frame = Page.Frames[1];49 var result = await frame.EvaluateExpressionAsync<int>("compute(3, 5)");50 Assert.Equal(15, result);51 }52 [Fact]53 public async Task ShouldAwaitReturnedTask()54 {55 bool called = false;56 await Page.ExposeFunctionAsync("changeFlag", () =>57 {58 called = true;59 return Task.CompletedTask;60 });61 await Page.EvaluateExpressionAsync("changeFlag()");62 Assert.True(called);63 }64 [Fact]65 public async Task ShouldWorkWithAction()66 {67 bool called = false;68 await Page.ExposeFunctionAsync("changeFlag", () =>69 {70 called = true;71 });72 await Page.EvaluateExpressionAsync("changeFlag()");73 Assert.True(called);74 }75 }76}

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PuppeteerConnectTests.cs

Source:PuppeteerConnectTests.cs Github

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...19 };20 var browser = await Puppeteer.ConnectAsync(options, TestConstants.LoggerFactory);21 using (var page = await browser.NewPageAsync())22 {23 var response = await page.EvaluateExpressionAsync<int>("7 * 8");24 Assert.Equal(56, response);25 }26 using (var originalPage = await Browser.NewPageAsync())27 {28 var response = await originalPage.EvaluateExpressionAsync<int>("7 * 6");29 Assert.Equal(42, response);30 }31 }32 [Fact]33 public async Task ShouldBeAbleToReconnectToADisconnectedBrowser()34 {35 var options = new ConnectOptions()36 {37 BrowserWSEndpoint = Browser.WebSocketEndpoint38 };39 var url = TestConstants.ServerUrl + "/​frames/​nested-frames.html";40 var page = await Browser.NewPageAsync();41 await page.GoToAsync(url);42 Browser.Disconnect();43 using (var browser = await Puppeteer.ConnectAsync(options, TestConstants.LoggerFactory))44 {45 var pages = (await browser.PagesAsync()).ToList();46 var restoredPage = pages.FirstOrDefault(x => x.Url == url);47 Assert.NotNull(restoredPage);48 var frameDump = FrameUtils.DumpFrames(restoredPage.MainFrame);49 Assert.Equal(TestConstants.NestedFramesDumpResult, frameDump);50 var response = await restoredPage.EvaluateExpressionAsync<int>("7 * 8");51 Assert.Equal(56, response);52 }53 }54 }55}...

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FrameEvaluateTests.cs

Source:FrameEvaluateTests.cs Github

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...20 await FrameUtils.AttachFrameAsync(Page, "frame1", TestConstants.EmptyPage);21 Assert.Equal(2, Page.Frames.Count());22 var frame1 = Page.MainFrame;23 var frame2 = Page.FirstChildFrame();24 await frame1.EvaluateExpressionAsync("window.FOO = 'foo'");25 await frame2.EvaluateExpressionAsync("window.FOO = 'bar'");26 Assert.Equal("foo", await frame1.EvaluateExpressionAsync<string>("window.FOO"));27 Assert.Equal("bar", await frame2.EvaluateExpressionAsync<string>("window.FOO"));28 }29 [PuppeteerTest("evaluation.spec.ts", "Frame.evaluate", "should execute after cross-site navigation")]30 [PuppeteerFact]31 public async Task ShouldExecuteAfterCrossSiteNavigation()32 {33 await Page.GoToAsync(TestConstants.EmptyPage);34 var mainFrame = Page.MainFrame;35 Assert.Contains("localhost", await mainFrame.EvaluateExpressionAsync<string>("window.location.href"));36 await Page.GoToAsync(TestConstants.CrossProcessHttpPrefix + "/​empty.html");37 Assert.Contains("127", await mainFrame.EvaluateExpressionAsync<string>("window.location.href"));38 }39 }40}...

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ExecutionContextTests.cs

Source:ExecutionContextTests.cs Github

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...25 Assert.NotEqual(context1, context2);26 Assert.Equal(Page.MainFrame, context1.Frame);27 Assert.Equal(Page.FirstChildFrame(), context2.Frame);28 await Task.WhenAll(29 context1.EvaluateExpressionAsync("window.a = 1"),30 context2.EvaluateExpressionAsync("window.a = 2")31 );32 var a1 = context1.EvaluateExpressionAsync<int>("window.a");33 var a2 = context2.EvaluateExpressionAsync<int>("window.a");34 await Task.WhenAll(a1, a2);35 Assert.Equal(1, a1.Result);36 Assert.Equal(2, a2.Result);37 }38 }39}

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EvaluateTests.cs

Source:EvaluateTests.cs Github

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...17 await FrameUtils.AttachFrameAsync(Page, "frame1", TestConstants.EmptyPage);18 Assert.Equal(2, Page.Frames.Count());19 var frame1 = Page.Frames.ElementAt(0);20 var frame2 = Page.Frames.ElementAt(1);21 await frame1.EvaluateExpressionAsync("window.FOO = 'foo'");22 await frame2.EvaluateExpressionAsync("window.FOO = 'bar'");23 Assert.Equal("foo", await frame1.EvaluateExpressionAsync<string>("window.FOO"));24 Assert.Equal("bar", await frame2.EvaluateExpressionAsync<string>("window.FOO"));25 }26 [Fact]27 public async Task ShouldExecuteAfterCrossSiteNavigation()28 {29 await Page.GoToAsync(TestConstants.EmptyPage);30 var mainFrame = Page.MainFrame;31 Assert.Contains("localhost", await mainFrame.EvaluateExpressionAsync<string>("window.location.href"));32 await Page.GoToAsync(TestConstants.CrossProcessHttpPrefix + "/​empty.html");33 Assert.Contains("127", await mainFrame.EvaluateExpressionAsync<string>("window.location.href"));34 }35 }36}...

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ContextTests.cs

Source:ContextTests.cs Github

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...20 Assert.NotNull(context1);21 Assert.NotNull(context2);22 Assert.NotEqual(context1, context2);23 await Task.WhenAll(24 context1.EvaluateExpressionAsync("window.a = 1"),25 context2.EvaluateExpressionAsync("window.a = 2")26 );27 var a1 = context1.EvaluateExpressionAsync<int>("window.a");28 var a2 = context2.EvaluateExpressionAsync<int>("window.a");29 await Task.WhenAll(a1, a2);30 Assert.Equal(1, a1.Result);31 Assert.Equal(2, a2.Result);32 }33 }34}

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EvaluateExpressionAsync

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static void Main(string[] args)7 {8 MainAsync().Wait();9 }10 static async Task MainAsync()11 {12 var browser = await Puppeteer.LaunchAsync(new LaunchOptions13 {14 Args = new string[] { "--no-sandbox" }15 });16 var page = await browser.NewPageAsync();17 var result = await page.EvaluateExpressionAsync<int>("1 + 2");18 Console.WriteLine(result);19 await browser.CloseAsync();20 }21 }22}23public Task<T> EvaluateExpressionAsync<T>(string pageFunction, params object[] args);24using System;25using System.Threading.Tasks;26using PuppeteerSharp;27{28 {29 static void Main(string[] args)30 {31 MainAsync().Wait();32 }33 static async Task MainAsync()34 {

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EvaluateExpressionAsync

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4{5 {6 static async Task Main(string[] args)7 {8 var options = new LaunchOptions { Headless = false };9 var browser = await Puppeteer.LaunchAsync(options);10 var page = await browser.NewPageAsync();11 var result = await page.EvaluateExpressionAsync("1+2");12 Console.WriteLine(result);13 await browser.CloseAsync();14 }15 }16}17public Task<dynamic> EvaluateExpressionAsync(string pageFunction, params object[] args)18using System;19using System.Threading.Tasks;20using PuppeteerSharp;21{22 {23 static async Task Main(string[] args)24 {25 var options = new LaunchOptions { Headless = false };26 var browser = await Puppeteer.LaunchAsync(options);27 var page = await browser.NewPageAsync();28 var result = await page.EvaluateExpressionAsync("document.querySelector('input[name=q]').value");29 Console.WriteLine(result);30 await browser.CloseAsync();31 }32 }33}34public Task<dynamic> EvaluateFunctionAsync(string pageFunction, params object[] args)35using System;36using System.Threading.Tasks;37using PuppeteerSharp;38{39 {40 static async Task Main(string[] args)41 {

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EvaluateExpressionAsync

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1var result = await frame.EvaluateExpressionAsync<double>("1 + 2");2var result = await frame.EvaluateExpressionAsync<bool>("() => Promise.resolve(8 * 7)");3var result = await frame.EvaluateExpressionAsync<bool>("() => Promise.resolve(8 * 7)");4var result = await frame.EvaluateExpressionAsync("() => Promise.resolve(8 * 7)");5var result = await frame.EvaluateExpressionAsync("() => Promise.resolve(8 * 7)");6var result = await frame.EvaluateExpressionAsync("() => Promise.resolve(8 * 7)");7var result = await frame.EvaluateExpressionAsync("() => Promise.resolve(8 * 7)");8var result = await frame.EvaluateExpressionAsync("() => Promise.resolve(8 * 7)");9var result = await frame.EvaluateExpressionAsync("() => Promise.resolve(8 * 7)");10var result = await frame.EvaluateExpressionAsync("() => Promise.resolve(8 * 7)");11var result = await frame.EvaluateExpressionAsync("()

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EvaluateExpressionAsync

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1var page = await browser.NewPageAsync();2var frame = page.MainFrame;3var result = await frame.EvaluateExpressionAsync("document.title");4Console.WriteLine(result);5var page = await browser.NewPageAsync();6var frame = page.MainFrame;7var result = await frame.EvaluateExpressionHandleAsync("document.title");8Console.WriteLine(result);9var page = await browser.NewPageAsync();10var frame = page.MainFrame;11var result = await frame.EvaluateFunctionAsync("function() { return document.title; }");12Console.WriteLine(result);13var page = await browser.NewPageAsync();14var frame = page.MainFrame;15var result = await frame.EvaluateFunctionHandleAsync("function() { return document.title; }");16Console.WriteLine(result);17var page = await browser.NewPageAsync();18var frame = page.MainFrame;19var result = await frame.EvaluateHandleAsync("document.title");20Console.WriteLine(result);21var page = await browser.NewPageAsync();22var frame = page.MainFrame;23var result = await frame.EvaluateAsync("document.title");24Console.WriteLine(result);25var page = await browser.NewPageAsync();26var result = await page.EvaluateAsync("document.title");27Console.WriteLine(result);28var page = await browser.NewPageAsync();29var result = await page.EvaluateAsync("document.title");

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EvaluateExpressionAsync

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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(launchOptions);11 var page = await browser.NewPageAsync();12 var result = await page.EvaluateExpressionAsync("document.title");13 Console.WriteLine(result);14 await browser.CloseAsync();15 }16 }17}18using System;19using System.Threading.Tasks;20using PuppeteerSharp;21{22 {23 static async Task Main(string[] args)24 {25 {26 };27 var browser = await Puppeteer.LaunchAsync(launchOptions);28 var page = await browser.NewPageAsync();29 var result = await page.EvaluateFunctionAsync("() => document.title");30 Console.WriteLine(result);31 await browser.CloseAsync();32 }33 }34}35using System;36using System.Threading.Tasks;37using PuppeteerSharp;38{39 {40 static async Task Main(string[] args)41 {42 {43 };

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EvaluateExpressionAsync

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1var page = await _browser.NewPageAsync();2var frame = page.MainFrame;3var result = await frame.EvaluateExpressionAsync("2+2");4Console.WriteLine(result);5var page = await _browser.NewPageAsync();6var frame = page.MainFrame;7var result = await frame.EvaluateFunctionAsync("() => 2+2");8Console.WriteLine(result);9var page = await _browser.NewPageAsync();10var frame = page.MainFrame;11var result = await frame.EvaluateFunctionAsync("x => x + 2", 2);12Console.WriteLine(result);13var page = await _browser.NewPageAsync();14var frame = page.MainFrame;15var result = await frame.EvaluateExpressionHandleAsync("document.body");16Console.WriteLine(result);17var page = await _browser.NewPageAsync();18var frame = page.MainFrame;19var result = await frame.EvaluateFunctionHandleAsync("() => document.body");20Console.WriteLine(result);21var page = await _browser.NewPageAsync();22var frame = page.MainFrame;23var result = await frame.EvaluateFunctionHandleAsync("x => x + 2", 2);24Console.WriteLine(result);25var page = await _browser.NewPageAsync();26var frame = page.MainFrame;27var result = await frame.EvaluateHandleAsync("document.body");28Console.WriteLine(result);

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EvaluateExpressionAsync

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1var browser = await Puppeteer.LaunchAsync(new LaunchOptions2{3 Args = new string[] { "--start-maximized" }4});5var page = await browser.NewPageAsync();6var result = await page.EvaluateExpressionAsync<string>("document.title");7Console.WriteLine(result);8await browser.CloseAsync();9var browser = await Puppeteer.LaunchAsync(new LaunchOptions10{11 Args = new string[] { "--start-maximized" }12});13var page = await browser.NewPageAsync();14var result = await page.EvaluateExpressionAsync<string>("document.URL");15Console.WriteLine(result);16await browser.CloseAsync();17var browser = await Puppeteer.LaunchAsync(new LaunchOptions18{19 Args = new string[] { "--start-maximized" }20});21var page = await browser.NewPageAsync();22var result = await page.EvaluateExpressionAsync<string>("document.body.innerHTML");23Console.WriteLine(result);24await browser.CloseAsync();25var browser = await Puppeteer.LaunchAsync(new LaunchOptions26{27 Args = new string[] { "--start-maximized" }28});29var page = await browser.NewPageAsync();30var result = await page.EvaluateExpressionAsync<string>("document.body.childNodes.length");31Console.WriteLine(result);32await browser.CloseAsync();

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EvaluateExpressionAsync

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1var frame = page.MainFrame;2var result = await frame.EvaluateExpressionAsync<string>("document.querySelector('h1').innerText");3var frame = page.MainFrame;4var result = await frame.EvaluateFunctionAsync<string>("(selector) => document.querySelector(selector).innerText", "h1");5var result = await page.EvaluateExpressionAsync<string>("document.querySelector('h1').innerText");6var result = await page.EvaluateFunctionAsync<string>("(selector) => document.querySelector(selector).innerText", "h1");7var elementHandle = await page.QuerySelectorAsync("h1");8var result = await elementHandle.EvaluateExpressionAsync<string>("node => node.innerText");9var elementHandle = await page.QuerySelectorAsync("h1");10var result = await elementHandle.EvaluateFunctionAsync<string>("(node, selector) => node.querySelector(selector).innerText", "h1");11var result = await page.EvaluateExpressionAsync<string>("document.querySelector('h1').innerText");12var result = await page.EvaluateFunctionAsync<string>("(selector) => document.querySelector(selector).innerText", "h1");13var result = await page.EvaluateExpressionAsync<string>("document.querySelector('h1').innerText");

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EvaluateExpressionAsync

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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 await page.WaitForSelectorAsync("input[title='Search']");13 var result = await page.EvaluateExpressionAsync<int>("document.querySelectorAll('input[title=\"Search\"]').length");14 Console.WriteLine(result);15 Console.ReadKey();16 }17 }18}19using System;20using System.Threading.Tasks;21using PuppeteerSharp;22{23 {24 static async Task Main(string[] args)25 {26 var browser = await Puppeteer.LaunchAsync(new LaunchOptions27 {28 });29 var page = await browser.NewPageAsync();30 await page.WaitForSelectorAsync("input[title='Search']");31 var result = await page.EvaluateFunctionAsync<int>("() => document.querySelectorAll('input[title=\"Search\"]').length");32 Console.WriteLine(result);33 Console.ReadKey();34 }35 }36}37using System;38using System.Threading.Tasks;39using PuppeteerSharp;40{41 {42 static async Task Main(string[] args)43 {44 var browser = await Puppeteer.LaunchAsync(new LaunchOptions45 {46 });47 var page = await browser.NewPageAsync();48 await page.WaitForSelectorAsync("input[title='Search']");49 var result = await page.EvaluateFunctionAsync<int>("() => { return document.querySelectorAll('input[title=\"Search\"]').length; }");50 Console.WriteLine(result);

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EvaluateExpressionAsync

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1var frame = await Page.GetFrameByNameAsync("frame1");2var result = await frame.EvaluateExpressionAsync<string>("document.querySelector('h1').textContent");3Console.WriteLine(result);4var frame = await Page.GetFrameByNameAsync("frame1");5var result = await frame.EvaluateExpressionAsync<string>("document.querySelector('h1').textContent");6Console.WriteLine(result);7var frame = await Page.GetFrameByNameAsync("frame1");8var result = await frame.EvaluateExpressionAsync<string>("document.querySelector('h1').textContent");9Console.WriteLine(result);10var frame = await Page.GetFrameByNameAsync("frame1");11var result = await frame.EvaluateExpressionAsync<string>("document.querySelector('h1').textContent");12Console.WriteLine(result);13var frame = await Page.GetFrameByNameAsync("frame1");14var result = await frame.EvaluateExpressionAsync<string>("document.querySelector('h1').textContent");15Console.WriteLine(result);16var frame = await Page.GetFrameByNameAsync("frame1");17var result = await frame.EvaluateExpressionAsync<string>("document.querySelector('h1').textContent");18Console.WriteLine(result);19var frame = await Page.GetFrameByNameAsync("frame1");20var result = await frame.EvaluateExpressionAsync<string>("

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