在ASP.NET Core中做出响应后做一些工作 [英] Do some work after the response in ASP.NET Core

问题描述

我有一个使用EFCore的ASP.NET Core网站。
我想做一些工作，例如登录到数据库，但是在将响应发送给用户以便更快回答之后。

I have an ASP.NET Core website, using EFCore. I would like to do some work like logging to the database, but after having sent the response to the user in order to answer faster.

我可以做它在不同的线程中，但是由于对DbContext的异步访问，我不确定它是安全的。有建议的方法吗？

I could do it in a different thread, but due to async access of the DbContext I am not sure it is safe. Is there any recommended way to do that?

public async Task<IActionResult> Request([FromForm]RequestViewModel model, string returnUrl = null)
{
    try 
    {
      var newModel = new ResponseViewModel(model);
      // Some work 
      return View("RequestView",newModel)
    }
    finally
    {
        // Some analysis on the request
        // I would like to defer this part
        await Log(model);
    }
}

原因之一是我想打电话一种Web服务（地理编码），不需要回答，但可以在日志上正常工作（我需要坐标的城市/国家/地区）。

One of the reason is that I would like to call a web-service (geocoding), which is not needed to answer, but good to work on the log (I need the city/country of coordinates).

推荐答案

我看到这从未得到解答，但实际上有解决方案。
简单的解决方案：

I see this has never been answered, but actually have a solution. The simple solution:

public async Task<IActionResult> Request([FromForm]RequestViewModel model, string returnUrl = null)
{
    try 
    {
      var newModel = new ResponseViewModel(model);
      // Some work 
      return View("RequestView",newModel)
    }
    finally
    {
        Response.OnCompleted(async () =>
        {
            // Do some work here
            await Log(model);
        });
    }
}

安全的解决方案，如 OnCompleted 过去曾在发送响应之前被调用，因此延迟了响应：

The secure solution, as OnCompleted used to be called before the response being sent, so delaying the response:

public static void OnCompleted2(this HttpResponse resp, Func<Task> callback)
{
    resp.OnCompleted(() =>
    {
        Task.Run(() => { try { callback.Invoke(); } catch {} });
        return Task.CompletedTask;
    });
}

并调用 Response.OnCompleted2（async（）= > {/ *一些异步工作* /}）

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