.NET(C#)中Puppeteer API的PuppeteerSharp的使用

1、使用文档

PuppeteerSharp文档：http://www.puppeteersharp.com/api/index.html

PuppeteerSharp源码：https://github.com/kblok/puppeteer-sharp

2、安装PuppeteerSharp

使用Nuget搜索PuppeteerSharp，找到PuppeteerSharp点击安装即可。

相关文档：VS(Visual Studio)中Nuget的使用

3、PuppeteerSharp的使用

1）网页截图

await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
var browser = await Puppeteer.LaunchAsync(new LaunchOptions
{
    Headless = true
});
var page = await browser.NewPageAsync();
await page.GoToAsync("http://www.google.com");
await page.ScreenshotAsync(outputFile);
生成截图前也可以改变ViewPort：
await page.SetViewport(new ViewPortOptions
{
    Width = 500,
    Height = 500
});

2）网页保存成pdf文件

await new BrowserFetcher().DownloadAsync(BrowserFetcher.DefaultRevision);
var browser = await Puppeteer.LaunchAsync(new LaunchOptions
{
    Headless = true
});
var page = await browser.NewPageAsync();
await page.GoToAsync("http://www.google.com");
await page.PdfAsync(outputFile);

3）向网页中注入HTML

using(var page = await Browser.NewPageAsync())
{
    await page.SetContentAsync("<div>My Receipt</div>");
    var result = await page.GetContentAsync();
    await page.PdfAsync(outputFile);
    SaveHtmlToDB(result);
}

4）执行Javascript(js)代码

using (var page = await Browser.NewPageAsync())
{
    var seven = await page.EvaluateFunctionAsync<int>("4 + 3");
    var someObject = await page.EvaluateFunctionAsync<dynamic>("(value) => ({a: value})", 5);
    Console.WriteLine(someObject.a);
}

5）等待Selector内容加载

using (var page = await Browser.NewPageAsync())
{
    await page.GoToAsync("http://www.spapage.com");
    await page.WaitForSelectorAsync("div.main-content")
    await page.PdfAsync(outputFile));
}

6）等待满足Function条件

using (var page = await Browser.NewPageAsync())
{
    await page.GoToAsync("http://www.spapage.com");
    var watchDog = page.WaitForFunctionAsync("window.innerWidth < 100");
    await Page.SetViewport(new ViewPortOptions { Width = 50, Height = 50 });
    await watchDog;
}

7）连接到远程浏览器

var options = new ConnectOptions()
{
    BrowserWSEndpoint = $"wss://www.externalbrowser.io?token={apikey}"
};
var url = "https://www.google.com/";
using (var browser = await PuppeteerSharp.Puppeteer.ConnectAsync(options))
{
    using (var page = await browser.NewPageAsync())
    {
        await page.GoToAsync(url);
        await page.PdfAsync("wot.pdf");
    }
}