UniTask/Assets/Scenes/SandboxMain.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using UniRx.Async;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;

public class SandboxMain : MonoBehaviour
{
    public Button okButton;
    public Button cancelButton;
    public Text text;

    CancellationTokenSource cts;

    UniTaskCompletionSource2 ucs;

    void Start()
    {
        // Setup unobserverd tskexception handling
        TaskScheduler.UnobservedTaskException += TaskScheduler_UnobservedTaskException;

        // Optional: disable ExecutionContext if you don't use AsyncLocal.
        //if (!ExecutionContext.IsFlowSuppressed())
        //{
        //    ExecutionContext.SuppressFlow();
        //}

        //// Optional: disable SynchronizationContext(to boostup performance) if you completely use UniTask only
        //SynchronizationContext.SetSynchronizationContext(null);

        // -----

        Application.logMessageReceived += Application_logMessageReceived;


        ucs = new UniTaskCompletionSource2();

        okButton.onClick.AddListener(async () =>
        {
            await InnerAsync(false);
        });

        cancelButton.onClick.AddListener(async () =>
        {
            text.text = "";

            ucs.SetResult();

            await ucs.Task;
        });
    }

    private void Application_logMessageReceived(string condition, string stackTrace, LogType type)
    {
        text.text += "\n" + condition;
    }

    async UniTask2 OuterAsync(bool b)
    {
        UnityEngine.Debug.Log("START OUTER");

        await InnerAsync(b);
        await InnerAsync(b);

        UnityEngine.Debug.Log("END OUTER");

        // throw new InvalidOperationException("NAZO ERROR!?"); // error!?
    }

    async UniTask2 InnerAsync(bool b)
    {
        if (b)
        {
            UnityEngine.Debug.Log("Start delay:" + Time.frameCount);
            await UniTask2.DelayFrame(60);
            UnityEngine.Debug.Log("End delay:" + Time.frameCount);
            await UniTask2.DelayFrame(60);
            UnityEngine.Debug.Log("Onemore end delay:" + Time.frameCount);
        }
        else
        {
            UnityEngine.Debug.Log("Empty END");
            throw new InvalidOperationException("FOOBARBAZ");
        }
    }


























    private void TaskScheduler_UnobservedTaskException(object sender, UnobservedTaskExceptionEventArgs e)
    {
        // e.SetObserved();
        // or other custom write code.
        UnityEngine.Debug.LogError("Unobserved:" + e.Exception.ToString());
    }
}