Cheap Windows Hosting Review

CancellationTokenSource and TaskCompletionSource in.NET

Posted on by Pablo Francesco

A comprehensive collection of capabilities for handling asynchronous programming and controlling the execution of concurrent operations is provided by the.NET framework. CancellationTokenSource and TaskCompletionSource are two crucial elements in this domain. We will examine these classes in detail in this post, looking at their features, applications, and contributions to the development of effective and responsive apps.

In.NET, TaskCompletionSource

Within the.NET Task Parallel Library (TPL), TaskCompletionSource is a potent class that gives developers the ability to directly build and manage a task’s lifecycle. In situations where the outcome of an asynchronous action needs to be explicitly set, this class acts as a bridge between synchronous and asynchronous code.

Utilizing TaskCompletionSource to Create a Task

To get a sense of how TaskCompletionSource functions, let’s examine a simple example. Let’s say you have a method that has to return a Task<int> that represents the outcome after completing a laborious procedure.

public Task<int> PerformAsyncOperation()
{
    TaskCompletionSource<int> tcs = new TaskCompletionSource<int>();

    // Simulating an asynchronous operation
    Task.Run(() =>
    {
        // Perform some time-consuming operation
        int result = 42;

        // Set the result when the operation is complete
        tcs.SetResult(result);
    });

    return tcs.Task;
}

In this example, an asynchronous operation is simulated using Task.Run, and a Task<int> whose result is explicitly set upon operation completion is created using TaskCompletionSource.

Handling TaskCompletionSource’s Errors and Cancellations

An asynchronous operation’s TaskCompletionSource can also be utilized to manage cancellations or errors. To indicate that an exception occurred during the operation, for instance, you can call SetException.

public Task<int> PerformAsyncOperationWithException()
{
    TaskCompletionSource<int> tcs = new TaskCompletionSource<int>();

    Task.Run(() =>
    {
        try
        {
            // Simulate an operation that might throw an exception
            int result = 42 / 0;
            tcs.SetResult(result);
        }
        catch (Exception ex)
        {
            // Set the exception in the TaskCompletionSource
            tcs.SetException(ex);
        }
    });

    return tcs.Task;
}

Use Cases for TaskCompletionSource Adapting Legacy Code
TaskCompletionSource can be used to provide asynchronous wrappers for code that wasn’t intended for asynchronous operations.

Custom Asynchronous Operations
TaskCompletionSource offers a mechanism to construct custom asynchronous operations in situations where the built-in async/await pattern is not appropriate.
Fine-Spun Control: More control over the execution flow may be required by developers in order to manage intricate asynchronous workflows or handle faults in particular ways.

In.NET, CancellationTokenSource

The CancellationToken framework includes CancellationTokenSource, which offers a method for creating and managing CancellationTokens. This class offers a way to gently end running activities, which is especially helpful in situations where you want to cease asynchronous actions.

Using CancellationTokenSource to Create a CancellationToken

Let’s look at an example where you wish to carry out a cancelable asynchronous operation. The asynchronous procedure receives a CancellationToken that has been created using CancellationTokenSource.

public async Task<int> PerformCancelableAsyncOperation(CancellationToken cancellationToken)
{
    await Task.Delay(5000, cancellationToken); // Simulated async operation

    return 42;
}

Create a CancellationTokenSource, cancel it as needed, and then provide the related CancellationToken to the asynchronous method to start a cancellation.

public async Task PerformCancellationExample()
{
    using (CancellationTokenSource cts = new CancellationTokenSource())
    {
        Task<int> operationTask = PerformCancelableAsyncOperation(cts.Token);

        // Perform other tasks or wait for user input

        // Cancel the operation if needed
        cts.Cancel();

        try
        {
            int result = await operationTask;
            Console.WriteLine($"Result: {result}");
        }
        catch (OperationCanceledException)
        {
            Console.WriteLine("Operation was canceled.");
        }
    }
}

Use Cases for CancellationTokenSource

  1. User-Initiated Cancellation: In applications with user interfaces, CancellationTokenSource can be used to respond to user actions, such as cancel buttons.
  2. Timeout Handling: When you want to set a timeout for an asynchronous operation, CancellationTokenSource can be used with Task.Delay.
  3. Cancellation of Parallel Tasks: In scenarios where multiple parallel tasks are running, CancellationTokenSource can be shared among these tasks to cancel them collectively.

Conclusion

Developers can greatly benefit from TaskCompletionSource and CancellationTokenSource when it comes to asynchronous programming in the.NET framework. They make it possible to create responsive and effective apps by giving users flexibility and control over asynchronous activities. These classes are essential for developing reliable and responsive software solutions, whether you need to modify legacy code, construct new asynchronous workflows, or handle cancellations politely. Gaining an understanding of their utilization and adding them to your toolbox will improve your capacity to develop apps in the.NET ecosystem that are both high-performing and easy to use.

Best ASP.NET Core Hosting

The feature and reliability are the most important things when choosing a good ASP.NET Core hosting. HostForLIFE is the leading provider of Windows hosting and affordable ASP.NET Core , their servers are optimized for PHP web applications such as the latest ASP.NET Core version. The performance and the uptime of the ASP.NET Core  hosting service are excellent, and the features of the web hosting plan are even greater than what many hosting providers ask you to pay for. At HostForLIFEASP.NET, customers can also experience fast ASP.NET Core hosting. The company invested a lot of money to ensure the best and fastest performance of the datacenters, servers, network and other facilities. Its data centers are equipped with top equipment like cooling system, fire detection, high-speed Internet connection, and so on. That is why HostForLIFEASP.NET guarantees 99.9% uptime for ASP.NET Core . And the engineers do regular maintenance and monitoring works to assure its ASP.NET Core  hosting are security and always up.

hostforlifebanner