Unity C# script to execute task asynchronously in background and process result on Unity main thread. The script can be used to run compute intensive or other operations such as HTTP stream listener in background. The UnityMainThreadDispatcher is used to move the result of async task to the main thread.

AsyncTaskRunner.cs

using System;
using System.Threading.Tasks;
using UnityEngine;
using PimDeWitte.UnityMainThreadDispatcher;

/// <summary>
/// A Unity C# script to execute task asynchronously and process result on Unity main thread.
/// </summary>
/// Note: This script utilizes the UnityMainThreadDispatcher 
/// from https://github.com/PimDeWitte/UnityMainThreadDispatcher package 
/// to dispatch calls to the main thread
public class AsyncTaskRunner : MonoBehaviour
{
    public event Action<bool> OnAsyncTaskCompletion;

    private void Start()
    {
        // Attach action for demo purposes
        OnAsyncTaskCompletion += HandleTaskCompletion;

        // Initiate background operation
        Task.Run(() => ExecuteBackgroundOperationAsync());
    }

    /// <summary>
    /// Executes an operation asynchronously to avoid blocking Unity's main render thread.
    /// </summary>
    private async Task ExecuteBackgroundOperationAsync()
    {
        // Emulate background operation execution
        await Task.Delay(100);

        OnAsyncTaskCompletion?.Invoke(true);
    }

    private void HandleTaskCompletion(bool taskCompleted)
    {
        UnityMainThreadDispatcher.Instance().Enqueue(() => {
            // Process the result on the main thread
            // This could be updating UI or GameObjects
            Debug.Log($"Async Operation Result: {taskCompleted}");
        });
    }
}