How to use DownAsync method of Microsoft.Playwright.Core.Keyboard class

Your page might be recreating the DOM. To overcome that you can use the locator feature from playwright.

var locator = page.Locator("inputSelector");
await locator.ClickAsync();

Using ideas from comments on my answer I was able to accomplish the goal. I ended up passing a cancellation token to a Task.Delay(30000, token). Then if I got the data I wanted and set the result value, I just cancelled the token.

string? result = null;
var tokenSource = new CancellationTokenSource();
var cancelToken = tokenSource.Token;

// Start listening for new pages (ClickAsync below opens in a new page)
context.Page += (_, newPage) =>
{
  // From the new page, start listening for requests that page generates
  newPage.Request += async (_, request) =>
  {
    if (request.Url.Contains("some_identifier"))
    {
      await newPage.GotoAsync(request.Url);
      result = await newPage.InnerTextAsync("body");
      tokenSource.Cancel(); // <-- Got what we needed, cancel 30 second timer
    }
  };
};

await mainPage.Locator("a#somelink").ClickAsync();

try {
  await Task.Delay(30000, cancelToken); // <-- Timeout after 30 seconds.
}
catch
{
  // Not a fan of tokenSource.Cancel() throwing an exception, but I can deal with it.
}

return result;

With Visual Studio projects you can add post-build-events, which will run on you dev machine and in the Azure Pipeline during a build (tested with VSBuild@1)

Example using the VS UI: (you will need to adjust paths for ubuntu)

echo $(TargetDir).playwright\node\win32_x64\playwright.cmd install
$(TargetDir).playwright\node\win32_x64\playwright.cmd install
echo Done

or adding directly to a .csproj

  <Target Name="PostBuild" AfterTargets="PostBuildEvent">
    <Exec Command="echo $(TargetDir).playwright\node\win32_x64\playwright.cmd install;$(TargetDir).playwright\node\win32_x64\playwright.cmd install;echo Done" />
  </Target>

This should do it:

ILocator service17 = page.Locator("//span[text()=ServiceName" + ServiceName + "]");

Using ideas from comments on my answer I was able to accomplish the goal. I ended up passing a cancellation token to a Task.Delay(30000, token). Then if I got the data I wanted and set the result value, I just cancelled the token.

string? result = null;
var tokenSource = new CancellationTokenSource();
var cancelToken = tokenSource.Token;

// Start listening for new pages (ClickAsync below opens in a new page)
context.Page += (_, newPage) =>
{
  // From the new page, start listening for requests that page generates
  newPage.Request += async (_, request) =>
  {
    if (request.Url.Contains("some_identifier"))
    {
      await newPage.GotoAsync(request.Url);
      result = await newPage.InnerTextAsync("body");
      tokenSource.Cancel(); // <-- Got what we needed, cancel 30 second timer
    }
  };
};

await mainPage.Locator("a#somelink").ClickAsync();

try {
  await Task.Delay(30000, cancelToken); // <-- Timeout after 30 seconds.
}
catch
{
  // Not a fan of tokenSource.Cancel() throwing an exception, but I can deal with it.
}

return result;

Playwright recommends to use their assertions, since they retry until either the timeout is reached or the condition is met.

Normal assertions like Assert.Equal don't retry.

See here: https://playwright.dev/dotnet/docs/test-assertions#locator-assertions-to-have-text

For your use-case it would be the following:

var locator = Page.Locator(".title");
await Expect(locator).ToHaveTextAsync("Welcome, Test User");

LaunchAsync expects a BrowserTypeLaunchOptions class. You could have that object serialized in a JSON file, parse it and pass that options instance as an argument.

Playwright for .NET discourages using xunit see here. Also the playwright.config file does only work for Node.js.

I'd recommend to set the DEBUG=pw:api env var to get more logs. Most likely your site is not reachable or hangs.

The error came from me not correctly understanding Docker stages. Here a fixed Dockerfile, where I installed Playwright in the base stage:

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
RUN apt-get update
RUN apt-get -y install curl gnupg
RUN curl -sL https://deb.nodesource.com/setup_16.x  | bash -
RUN apt-get -y install nodejs
RUN npx playwright install
RUN apt-get update && apt-get install -y --no-install-recommends \
    fonts-liberation\
    libasound2\
    libatk-bridge2.0-0\
    libatk1.0-0\
    libatspi2.0-0\
    libcairo2\
    libcups2\
    libdbus-1-3\
    libdrm2\
    libgbm1\
    libglib2.0-0\
    libgtk-3-0\
    libnspr4\
    libnss3\
    libpango-1.0-0\
    libx11-6\
    libxcb1\
    libxcomposite1\
    libxdamage1\
    libxext6\
    libxfixes3\
    libxrandr2
WORKDIR /app

FROM mcr.microsoft.com/dotnet/sdk:6.0-focal  AS build
WORKDIR /src
COPY ["Dashboard/Dashboard.csproj", "Dashboard/"]
RUN dotnet restore "Dashboard/Dashboard.csproj"
COPY . .
WORKDIR "/src/Dashboard"
RUN dotnet build "Dashboard.csproj" -c Release -o /app/build
FROM build AS publish
RUN dotnet publish "Dashboard.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "Dashboard.dll"]