How to use PageExposeFunctionAsync method of PuppeteerSharp.Tests.PageTests.ExposeFunctionTests class

Best Puppeteer-sharp code snippet using PuppeteerSharp.Tests.PageTests.ExposeFunctionTests.PageExposeFunctionAsync

PageExposeFunctionAsync

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp.Tests.Attributes;4using Xunit;5using Xunit.Abstractions;6{7 [Collection(TestConstants.TestFixtureCollectionName)]8 {9 public ExposeFunctionTests(ITestOutputHelper output) : base(output)10 {11 }12 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should work")]13 public async Task ShouldWork()14 {15 await Page.ExposeFunctionAsync("woof", (string s) => s + "woof");16 var result = await Page.EvaluateExpressionAsync<string>("woof('dog')");17 Assert.Equal("dogwoof", result);18 }19 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should work with complex objects")]20 public async Task ShouldWorkWithComplexObjects()21 {22 await Page.ExposeFunctionAsync("complexObject", (ComplexObject obj) => obj.Foo + " " + obj.Bar);23 var result = await Page.EvaluateExpressionAsync<string>("complexObject({foo: 'foo', bar: 'bar'})");24 Assert.Equal("foo bar", result);25 }26 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should throw for non-functions")]27 public async Task ShouldThrowForNonFunctions()28 {29 var exception = await Assert.ThrowsAsync<ArgumentException>(()30 => Page.ExposeFunctionAsync("object", new object()));31 Assert.Equal("Expected to get |function| object, but got |object|", exception.Message);32 }33 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should survive navigation")]34 public async Task ShouldSurviveNavigation()35 {36 await Page.ExposeFunctionAsync("woof", (string s) => s + "woof");37 await Page.GoToAsync(TestConstants.EmptyPage);38 var result = await Page.EvaluateExpressionAsync<string>("woof('dog')");39 Assert.Equal("dogwoof", result);40 }41 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should await returned promise")]

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PageExposeFunctionAsync

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp.Tests.Attributes;4using Xunit;5using Xunit.Abstractions;6{7 [Collection(TestConstants.TestFixtureCollectionName)]8 {9 public ExposeFunctionTests(ITestOutputHelper output) : base(output)10 {11 }12 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should work")]13 public async Task ShouldWork()14 {15 await Page.ExposeFunctionAsync("woof", () => "WOOF WOOF");16 var result = await Page.EvaluateExpressionAsync<string>("woof()");17 Assert.Equal("WOOF WOOF", result);18 }19 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should throw if the page is closed")]20 public async Task ShouldThrowIfThePageIsClosed()21 {22 await Page.ExposeFunctionAsync("woof", () => "WOOF WOOF");23 await Page.CloseAsync();24 var exception = await Assert.ThrowsAsync<TargetClosedException>(() => Page.EvaluateExpressionAsync<string>("woof()"));25 Assert.Contains("Protocol error", exception.Message);26 }27 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should survive cross-process navigation")]28 public async Task ShouldSurviveCrossProcessNavigation()29 {30 await Page.ExposeFunctionAsync("woof", () => "WOOF WOOF");31 var response = await Page.GoToAsync(TestConstants.EmptyPage);32 Assert.Equal(200, response.Status);33 var result = await Page.EvaluateExpressionAsync<string>("woof()");34 Assert.Equal("WOOF WOOF", result);35 }36 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should await returned promise")]37 public async Task ShouldAwaitReturnedPromise()38 {39 await Page.ExposeFunctionAsync("asyncWoof", () => Task.FromResult("WOOF WOOF"));40 var result = await Page.EvaluateExpressionAsync<string>("asyncWoof()");41 Assert.Equal("WOOF WOOF", result);42 }43 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should

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PageExposeFunctionAsync

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4using PuppeteerSharp.Tests.Attributes;5using Xunit;6using Xunit.Abstractions;7{8 [Collection(TestConstants.TestFixtureCollectionName)]9 {10 public ExposeFunctionTests(ITestOutputHelper output) : base(output)11 {12 }13 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should work")]14 public async Task ShouldWork()15 {16 await Page.ExposeFunctionAsync("woof", (string a) => $"{a} woof");17 var result = await Page.EvaluateExpressionAsync<string>("woof('dog')");18 Assert.Equal("dog woof", result);19 }20 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should work with complex objects")]21 public async Task ShouldWorkWithComplexObjects()22 {23 await Page.ExposeFunctionAsync("complexObject", (object a) => new { foo = a });24 var result = await Page.EvaluateExpressionAsync<ComplexObject>("complexObject({bar: 'baz'})");25 Assert.Equal("baz", result.Foo["bar"]);26 }27 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should throw for conflicting function names")]28 public async Task ShouldThrowForConflictingFunctionNames()29 {30 await Page.ExposeFunctionAsync("woof", (string a) => $"{a} woof");31 var exception = await Assert.ThrowsAsync<ArgumentException>(async () => await Page.ExposeFunctionAsync("woof", (string a) => $"{a} woof"));32 Assert.Equal("Failed to add page.exposeFunction('woof'): window['woof'] already exists", exception.Message);33 }34 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should survive cross-process navigation")]35 public async Task ShouldSurviveCrossProcessNavigation()36 {37 await Page.ExposeFunctionAsync("woof", (string a) => $"{a} woof");38 await Page.GoToAsync(TestConstants.EmptyPage);39 var result = await Page.EvaluateExpressionAsync<string>("woof('dog')");40 Assert.Equal("

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PageExposeFunctionAsync

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4using PuppeteerSharp.Tests.Attributes;5{6 [Collection(TestConstants.TestFixtureCollectionName)]7 {8 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should work")]9 public async Task ShouldWork()10 {11 await Page.ExposeFunctionAsync("woof", () => "WOOOF");12 var result = await Page.EvaluateFunctionAsync<string>("async() => { return await woof(); }");13 Assert.Equal("WOOOF", result);14 }15 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should throw in case of multiple registrations")]16 public async Task ShouldThrowInCaseOfMultipleRegistrations()17 {18 await Page.ExposeFunctionAsync("woof", () => "doggo");19 var exception = await Assert.ThrowsAsync<Exception>(() => Page.ExposeFunctionAsync("woof", () => "doggo"));20 Assert.Equal("Failed to add page method 'woof': window[\"woof\"] already exists", exception.Message);21 }22 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should survive cross-process navigation")]23 public async Task ShouldSurviveCrossProcessNavigation()24 {25 await Page.ExposeFunctionAsync("woof", () => "doggo");26 var response = await Page.GoToAsync(TestConstants.EmptyPage);27 Assert.True(response.Ok);28 var result = await Page.EvaluateFunctionAsync<string>("async() => { return await woof(); }");29 Assert.Equal("doggo", result);30 }31 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should await returned promise")]32 public async Task ShouldAwaitReturnedPromise()33 {34 await Page.ExposeFunctionAsync("woof", () => Task.FromResult("WOOF"));35 var result = await Page.EvaluateFunctionAsync<string>("async() => { return await woof(); }");36 Assert.Equal("WOOF", result);37 }38 [PuppeteerTest("page.spec.ts", "Page.exposeFunction", "should work right after cross-site navigation")]

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PageExposeFunctionAsync

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1var page = await browser.NewPageAsync();2await page.ExposeFunctionAsync("add", (Func<int, int, int>)((a, b) => a + b));3var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");4Console.WriteLine(result);5using System;6using System.Threading.Tasks;7using Xunit;8using Xunit.Abstractions;9{10 [Collection("PuppeteerLoaderFixture collection")]11 {12 public ExposeFunctionTests(ITestOutputHelper output) : base(output)13 {14 }15 public async Task ShouldWork()16 {17 await Page.ExposeFunctionAsync("add", (Func<int, int, int>)((a, b) => a + b));18 var result = await Page.EvaluateExpressionAsync<int>("add(5, 6)");19 Assert.Equal(11, result);20 }21 }22}23using System;24using System.Collections.Generic;25using System.Text;26{27 {28 public PageTests(ITestOutputHelper output) : base(output)29 {30 }31 }32}33using System;34using System.Collections.Generic;35using System.Text;36{37 {38 public PuppeteerBaseTest(ITestOutputHelper output)39 {40 Output = output;41 }42 public ITestOutputHelper Output { get; }43 public void Dispose()44 {

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PageExposeFunctionAsync

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1var page = await browser.NewPageAsync();2await page.ExposeFunctionAsync("add", (int a, int b) => a + b);3var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");4Console.WriteLine(result);5await browser.CloseAsync();6var page = await browser.NewPageAsync();7await page.ExposeFunctionAsync("readFile", async (string path) => File.ReadAllText(path));8var result = await page.EvaluateExpressionAsync<string>("readFile('/​etc/​hosts')");9Console.WriteLine(result);10await browser.CloseAsync();11var page = await browser.NewPageAsync();12await page.ExposeFunctionAsync("add", (int a, int b) => a + b);13var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");14Console.WriteLine(result);15await browser.CloseAsync();16var page = await browser.NewPageAsync();17await page.ExposeFunctionAsync("add", (int a, int b) => a + b);18var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");19Console.WriteLine(result);20await browser.CloseAsync();21var page = await browser.NewPageAsync();22await page.ExposeFunctionAsync("add", (int a, int b) => a + b);23var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");24Console.WriteLine(result);25await browser.CloseAsync();26var page = await browser.NewPageAsync();

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PageExposeFunctionAsync

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1var page = await browser.NewPageAsync();2await page.ExposeFunctionAsync("add", (Func<int, int, int>)Add);3var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");4Assert.Equal(11, result);5var page = await browser.NewPageAsync();6await page.ExposeFunctionAsync("readFile", (Func<string, Task<string>>)ReadFileAsync);7var result = await page.EvaluateExpressionAsync<string>("readFile('test.json')");8Assert.Equal("hello", result);9var page = await browser.NewPageAsync();10await page.ExposeFunctionAsync("add", (Func<int, int, int>)Add);11await page.EvaluateExpressionAsync("async function() { return await add(5, 6); }");12var page = await browser.NewPageAsync();13await page.ExposeFunctionAsync("readFile", (Func<string, Task<string>>)ReadFileAsync);14await page.EvaluateExpressionAsync("async function() { return await readFile('test.json'); }");15var page = await browser.NewPageAsync();16await page.ExposeFunctionAsync("add", (Func<int, int, int>)Add);17await page.EvaluateFunctionAsync("async function() { return await add(5, 6); }");18var page = await browser.NewPageAsync();19await page.ExposeFunctionAsync("readFile", (Func<string, Task<string>>)ReadFileAsync);20await page.EvaluateFunctionAsync("async function() { return await readFile('test.json'); }");

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PageExposeFunctionAsync

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1using System;2using System.Threading.Tasks;3using PuppeteerSharp;4using System.IO;5{6 {7 public async Task ShouldWork()8 {9 await Page.ExposeFunctionAsync("woof", () => "WOOF WOOF");10 var result = await Page.EvaluateExpressionAsync<string>("woof()");11 Assert.Equal("WOOF WOOF", result);12 }13 public async Task ShouldWorkWithHandles()14 {15 await Page.ExposeFunctionAsync("add", (int a, int b) => a + b);16 var result = await Page.EvaluateExpressionAsync<int>("add(5, 6)");17 Assert.Equal(11, result);18 }19 public async Task ShouldWorkWithComplexObjects()20 {21 await Page.ExposeFunctionAsync("complexObject", () => new22 {23 });24 var result = await Page.EvaluateExpressionAsync<string>("complexObject().foo");25 Assert.Equal("bar!", result);26 }27 public async Task ShouldAwaitReturnedPromise()28 {29 await Page.ExposeFunctionAsync("asyncAdd", (int a, int b) => Task.FromResult(a + b));30 var result = await Page.EvaluateExpressionAsync<int>("asyncAdd(5, 6)");31 Assert.Equal(11, result);32 }33 public async Task ShouldWorkWithElementHandle()34 {35 await Page.SetContentAsync("<html><body><div class=\"tweet\"><div class=\"like\">100</​div><div class=\"retweets\">10</​div></​div></​body></​html>");36 await Page.ExposeFunctionAsync("getLikes", (ElementHandle element) => element.QuerySelectorAsync(".like").Result.EvaluateFunctionAsync<int>("node => node.innerText"));37 var result = await Page.EvaluateExpressionAsync<int>("getLikes(document.querySelector('.tweet'))");38 Assert.Equal(100, result);39 }40 public async Task ShouldThrowExceptionInPageContext()41 {42 await Page.ExposeFunctionAsync("woof", () => throw new Exception("WOOF WOOF"));43 var exception = await Assert.ThrowsAsync<EvaluationFailedException>(()44 => Page.EvaluateExpressionAsync("woof()")45 );46 Assert.Contains("WOOF W

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PageExposeFunctionAsync

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1var page = await browser.NewPageAsync();2await page.ExposeFunctionAsync("add", (Func<int, int, int>)((a, b) => a + b));3var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");4var page = await browser.NewPageAsync();5await page.ExposeFunctionAsync("add", (Func<int, int, int>)((a, b) => a + b));6var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");7var page = await browser.NewPageAsync();8await page.ExposeFunctionAsync("add", (Func<int, int, int>)((a, b) => a + b));9var result = await page.EvaluateExpressionAsync<int>("add(5, 6)");

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StackOverFlow community discussions

Questions
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Get Result of document.querySelectorAll in PuppeteerSharp

using below,

using var page = browser.NewPageAsync().Result;

page.TypeAsync("input[name='elementname']", valuetobeset).Wait();
https://stackoverflow.com/questions/67332554/set-input-value-with-puppeteer-sharp

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