阅读ActionFilterAttribute中的Asp.Net Core Response正文 [英] Read Asp.Net Core Response body in ActionFilterAttribute

问题描述

我将Asp.Net Core用作Rest Api服务. 我需要访问ActionFilter中的请求和响应.实际上，我在OnActionExcecuted中找到了请求，但无法读取响应结果.

I'm using Asp.Net Core as a Rest Api Service. I need access to request and response in ActionFilter. Actually, I found the request in OnActionExcecuted but I can't read the response result.

我正在尝试按以下方式返回值:

I'm trying to return value as follow:

[HttpGet]
[ProducesResponseType(typeof(ResponseType), (int)HttpStatusCode.OK)]
[Route("[action]")]
public async Task<IActionResult> Get(CancellationToken cancellationToken)
{
    var model = await _responseServices.Get(cancellationToken);
    return Ok(model);
}

在ActionFilter的OnExcecuted方法中，如下所示:

And in ActionFilter OnExcecuted method as follow:

_request = context.HttpContext.Request.ReadAsString().Result;
_response = context.HttpContext.Response.ReadAsString().Result; //?

我正在尝试获取ReadAsString中的响应作为扩展方法，如下所示:

I'm trying to get the response in ReadAsString as an Extension method as follow:

public static async Task<string> ReadAsString(this HttpResponse response)
{
     var initialBody = response.Body;
     var buffer = new byte[Convert.ToInt32(response.ContentLength)];
     await response.Body.ReadAsync(buffer, 0, buffer.Length);
     var body = Encoding.UTF8.GetString(buffer);
     response.Body = initialBody;
     return body;
 }

但是，没有结果！

如何在OnActionExcecuted中获得响应?

How I can get the response in OnActionExcecuted?

感谢大家花时间尝试并帮助解释

Thanks, everyone for taking the time to try and help explain

推荐答案

如果您要记录json结果/查看结果，则无需读取整个响应流.只需序列化context.Result:

If you're logging for json result/ view result , you don't need to read the whole response stream. Simply serialize the context.Result:

public class MyFilterAttribute : ActionFilterAttribute
{
    private ILogger<MyFilterAttribute> logger;

    public MyFilterAttribute(ILogger<MyFilterAttribute> logger){
        this.logger = logger;
    }
    public override void OnActionExecuted(ActionExecutedContext context)
    {
        var result = context.Result;
        if (result is JsonResult json)
        {
            var x = json.Value;
            var status = json.StatusCode;
            this.logger.LogInformation(JsonConvert.SerializeObject(x));
        }
        if(result is ViewResult view){
            // I think it's better to log ViewData instead of the finally rendered template string
            var status = view.StatusCode;
            var x = view.ViewData;
            var name = view.ViewName;
            this.logger.LogInformation(JsonConvert.SerializeObject(x));
        }
        else{
            this.logger.LogInformation("...");
        }
    }

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