直接上代码，比较烦人，但是还请大神们留步多看几眼，指点一下学习的方向，目前不知道知识点缺失在哪里了。拜谢
当task的扩展方法，与多层 async await 套用，同时 async 后面的返回方式 都是 task的时候，到底是哪个task调用的 task的扩展方法，有点懵，

如下是task 的扩展方法，目的是增加try catch,我在其中增加了 显示 task id和 thread id
public static class TaskUtilities
{

   public static async void FireAndForgetSafeAsync(this Task task, IErrorHandler handler = null)

    {
        try
        {
            Console.WriteLine("进入FireAndForgetSafeAsync thread_id  " +　Thread.CurrentThread.ManagedThreadId);

            Console.WriteLine("进入FireAndForgetSafeAsync  task_id "+  task.Id);

            await task;

             Console.WriteLine("FireAndForgetSafeAsync 中 await后 thread_id  " +　Thread.CurrentThread.ManagedThreadId);
            Console.WriteLine("FireAndForgetSafeAsync 中 await后  task_id   " + task.Id);
        }
        catch (Exception ex)
        {
            handler?.HandleError(ex);
        }
    }
}

个人分析1：
当我 单层 创建一个task,引用 扩展方法时，创建的task id号，与进入扩展方法内输出的task id 时一个。请见附件1图
private void button2_Click(object sender, EventArgs e)
{
Console.WriteLine("button2_Click start thread id" + " " + Thread.CurrentThread.ManagedThreadId);
IErrorHandler errorHandler = null; // Get an instance somewhere
Task a = Task.Run(()=>
{
Console.WriteLine("task 内 thread id" + " " + Thread.CurrentThread.ManagedThreadId);
Thread.Sleep(3000);
});
Thread.Sleep(1000);
Console.WriteLine(" a.FireAndForgetSafeAsync(errorHandler); 前task id "+ a.Id);
a.FireAndForgetSafeAsync(errorHandler);
Thread.Sleep(100);
Console.WriteLine(" a.FireAndForgetSafeAsync(errorHandler); 后task id " + a.Id);
Console.WriteLine("button2_Click end thread id" + " " + Thread.CurrentThread.ManagedThreadId);
}

分析2
当我嵌套使用 async和 await的时候，我发现，出现了3个task id 而且都不一样，没明白问题出在了哪里，为什么会有这么多task id ，到底是那一层返回task,调用的扩展方法呢？

    private void button3_Click(object sender, EventArgs e)
    {
        Console.WriteLine(" button3_Click start  " + Thread.CurrentThread.ManagedThreadId);
        IErrorHandler errorHandler = null; // Get an instance somewhere
         asyncTask().FireAndForgetSafeAsync(errorHandler);
        Thread.Sleep(100);
        Console.WriteLine(" button3_Click end  " + Thread.CurrentThread.ManagedThreadId);
    }
    public async Task asyncTask()
    {
        Task  aa = wasteTime();
        await aa;
        Console.WriteLine(aa.Id);
    }

    public async Task wasteTime()
    {
        Task bb= Task.Run(() =>
        {
            Thread.Sleep(5000);
        });

Thread.Sleep(500);
await bb;
Console.WriteLine(bb.Id);
}

顺便想请教下，thread id和task id间的区别，
分不多了，还想大神们费心指点下，问题方向，再次拜谢，