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CSharp冷知识-await

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await 可以作用于任何提供GetAwaiter方法的类

await

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//常用
await FuncAsync();

async Task FuncAsync()
{
    await Task.Delay(1000);
}

//自定义
var myDelay = new MyDelay(2);
await myDelay;

class MyDelay
{
    int second;
    public MyDelay(int second)
    {
        this.second = second;
    }
    public TaskAwaiter GetAwaiter()
    {
        return Task.Delay(TimeSpan.FromSeconds(second)).GetAwaiter();
    }
}

//进阶
var myDelay = new MyDelay(2);
await myDelay;

class MyDelay
{
    public int second;
    public MyDelay(int second)
    {
        this.second = second;
    }
}
static class MyExtensions()
{
    public static TaskAwaiter GetAwaiter(this MyDelay md)
    {
        return Task.Delay(TimeSpan.FromSeconds(md.second)).GetAwaiter();
    }
}
//进进阶
await TimeSpan.FromSeconds(2);

static class MyExtensions()
{
    public static TaskAwaiter GetAwaiter(this MyDelay md)
    {
        return Task.Delay(TimeSpan.FromSeconds(md.second)).GetAwaiter();
    }
    public static TaskAwaiter GetAwaiter(this TimeSpan ts)
        =>Task.Delay(ts).GetAwaiter();
}
//进进进阶
await 2;

static class MyExtensions()
{
    public static TaskAwaiter GetAwaiter(this MyDelay md)
    {
        return Task.Delay(TimeSpan.FromSeconds(md.second)).GetAwaiter();
    }
    public static TaskAwaiter GetAwaiter(this TimeSpan ts)
        =>Task.Delay(ts).GetAwaiter();
    public static TaskAwaiter GetAwaiter(this int second)
        =>Task.Delay(TimeSpan.FromSeconds(second)).GetAwaiter();
}