DotNetBrowser-Examples/csharp/console/JavaScriptBridge.Promises/Program.cs at v4 · TeamDev-IP/DotNetBrowser-Examples · GitHub

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#region Copyright

// Copyright © 2026, TeamDev. All rights reserved.
//
// Redistribution and use in source and/or binary forms, with or without
// modification, must retain the above copyright notice and the following
// disclaimer.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#endregion

usingSystem;
usingSystem.Text;
usingSystem.Threading;
usingSystem.Threading.Tasks;
usingDotNetBrowser.Browser;
usingDotNetBrowser.Engine;
usingDotNetBrowser.Geometry;
usingDotNetBrowser.Js;

namespaceJavaScriptBridge.Promises
{
/// <summary>
/// This example demonstrates how to work with JavaScript Promises
/// via JS-.NET bridge.
/// </summary>
internalclassProgram
{
publicstaticvoidMain()
{
using(IEngineengine=EngineFactory.Create())
{
using(IBrowserbrowser=engine.CreateBrowser())
{
browser.Size=newSize(700,500);
byte[]htmlBytes=Encoding.UTF8.GetBytes(@"<html>
 <body>
 <script type='text/javascript'>
 function CreatePromise(success)
 {
 return new Promise(function(resolve, reject) {
 if(success) {
 resolve('Promise fulfilled.');
 }
 else {
 reject('Promise rejected.');
 }
 });
 };
 </script>
 </body>
 </html>");

browser.Navigation
.LoadUrl($"data:text/html;base64,{Convert.ToBase64String(htmlBytes)}")
.Wait();

IJsObjectwindow=browser.MainFrame
.ExecuteJavaScript<IJsObject>("window")
.Result;

// Prepare promise handlers.
Action<object>promiseResolvedHandler=
 o =>Console.WriteLine($"Success: {o}");
Action<object>promiseRejectedHandler=
 o =>Console.Error.WriteLine($"Error: {o}");

// Create a promise that is fulfilled.
Console.WriteLine("Create a promise that is fulfilled...");
IJsObjectpromise1=window.Invoke<IJsObject>("CreatePromise",true);
// Append fulfillment and rejection handlers to the promise.
promise1.Invoke("then",promiseResolvedHandler,promiseRejectedHandler);

// Create a promise that is rejected.
Console.WriteLine("Create a promise that is rejected...");
IJsObjectpromise2=window.Invoke<IJsObject>("CreatePromise",false);
// Append fulfillment and rejection handlers to the promise.
promise2.Invoke("then",promiseResolvedHandler,promiseRejectedHandler);

CreatePromiseAsync(window).Wait();
}
}

Console.WriteLine("Press any key to terminate...");
Console.ReadKey();
}

// #docfragment "JavaScriptBridge.Promises.Async"
privatestaticasyncTaskCreatePromiseAsync(IJsObjectwindow)
{
// IJsPromise can be integrated with async/await using TaskCompletionSource.

// Create a promise that is fulfilled.
Console.WriteLine("\nCreate another promise that is fulfilled...");
vartcs=newTaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
IJsPromisepromise3=window.Invoke<IJsPromise>("CreatePromise",true);
promise3.Then(
 o =>{Console.WriteLine($"Callback:Success: {o}");tcs.SetResult(o);},
 e =>tcs.SetException(newException(e?.ToString())));
objectresult=awaittcs.Task;
Console.WriteLine($"Result: {result}");

// Create a promise that is rejected.
Console.WriteLine("\nCreate another promise that is rejected...");
vartcs2=newTaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);
IJsPromisepromise4=window.Invoke<IJsPromise>("CreatePromise",false);
promise4.Then(
 o =>tcs2.SetResult(o),
 e =>{Console.WriteLine($"Callback:Error: {e}");tcs2.SetResult(null);});
awaittcs2.Task;
}
// #enddocfragment "JavaScriptBridge.Promises.Async"
}
}