【C#】TaskCompletionSource と CancellationToken を組み合わせて使う方法

概要

using System;
using System.Threading;
using System.Threading.Tasks;
using UnityEngine;

public sealed class Example : MonoBehaviour
{
    private readonly CancellationTokenSource m_cancellationTokenSource = new();

    private async void Start()
    {
        await RunAsync( m_cancellationTokenSource.Token );
    }

    private static async Task RunAsync( CancellationToken cancellationToken )
    {
        try
        {
            var tcs = new TaskCompletionSource<bool>();
            cancellationToken.Register( () => tcs.TrySetCanceled() );
            await tcs.Task;
            Debug.Log( "呼ばれない" );
        }
        catch ( OperationCanceledException e )
        {
            Debug.Log( "呼ばれる" );
        }
    }

    private void Update()
    {
        if ( Input.GetKeyDown( KeyCode.Space ) )
        {
            m_cancellationTokenSource.Cancel();
        }
    }
}

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