Interface IWorker

Namespace

Microsoft.Playwright

Assembly

Microsoft.Playwright.dll

The Worker class represents a WebWorker. worker event is emitted on the page object to signal a worker creation. close event is emitted on the worker object when the worker is gone.

page.Worker += (_, worker) =>
{
    Console.WriteLine($"Worker created: {worker.Url}");
    worker.Close += (_, _) => Console.WriteLine($"Worker closed {worker.Url}");
};
Console.WriteLine("Current Workers:");
foreach(var pageWorker in page.Workers)
{
Console.WriteLine($"\tWorker: {pageWorker.Url}");
}

public interface IWorker

Properties

Url

string Url { get; }

Property Value

string

Methods

EvaluateAsync<T>(string, object?)

Returns the return value of expression.

If the function passed to the EvaluateAsync<T>(string, object?) returns a Task, then EvaluateAsync<T>(string, object?) would wait for the promise to resolve and return its value.

If the function passed to the EvaluateAsync<T>(string, object?) returns a non- value, then EvaluateAsync<T>(string, object?) returns undefined. Playwright also supports transferring some additional values that are not serializable by JSON: -0, NaN, Infinity, -Infinity.

Task<T> EvaluateAsync<T>(string expression, object? arg = null)

Parameters

expression string

JavaScript expression to be evaluated in the browser context. If the expression evaluates to a function, the function is automatically invoked.

arg object

Optional argument to pass to expression.

Returns

Task<T>

Type Parameters

T

EvaluateHandleAsync(string, object?)

Returns the return value of expression as a IJSHandle.

The only difference between EvaluateAsync<T>(string, object?) and EvaluateHandleAsync(string, object?) is that EvaluateHandleAsync(string, object?) returns IJSHandle.

If the function passed to the EvaluateHandleAsync(string, object?) returns a Task, then EvaluateHandleAsync(string, object?) would wait for the promise to resolve and return its value.

Task<IJSHandle> EvaluateHandleAsync(string expression, object? arg = null)

Parameters

expression string

JavaScript expression to be evaluated in the browser context. If the expression evaluates to a function, the function is automatically invoked.

arg object

Optional argument to pass to expression.

Returns

Task<IJSHandle>

Events

Close

Emitted when this dedicated WebWorker is terminated.

event EventHandler<IWorker> Close

Event Type

EventHandler<IWorker>