在 web api asp.net 核心中修改 OnActionExecuted 中 ActionExecutedContext 的结果

Question

我正在 Web API 中写 custom filter 并且我想在 OnActionExecuted 方法中修改 ActionExecutedContext 的结果。

我得到的结果类型为 OkObjectResult，因为 action method 返回 IActionResult。

public void OnActionExecuted(ActionExecutedContext context)
{        
    var myResult = context.Result; 
    //Type of myResult is OkObjectResult          
}

那么我如何将这个 OkObjectResult 转换为我的模型 Object，这样我就可以使用 properties 并操纵这些值。

感谢任何建议。

Answer 1

OkObjectResult 的“值”属性 returns 对象。您可以修改对象的属性，甚至可以用新属性替换它。希望这对你有用。如果是，请将此标记为答案。

示例代码:

public class Student
{
  public string Name { get; set; }
}

 [ApiController]
    public class TestController : ControllerBase
    {
        [HttpGet, Route("api/Test/GetString")]
        [SampleActionFilter]
        public ActionResult<Student> GetString(string name)
        {
            if(name.StartsWith("s"))
            {
                return Ok(new Student{ Name = $"This is data {name}" });
            }
            else
            {
                return Ok(new Student { Name = $"No Name" });
            }
        }
    }

 public class SampleActionFilterAttribute : TypeFilterAttribute
    {
        public SampleActionFilterAttribute() : 
        base(typeof(SampleActionFilterImpl))
        {
        }

    private class SampleActionFilterImpl : IActionFilter
    {
        public void OnActionExecuting(ActionExecutingContext context)
        {
        
            // perform some business logic work

        }

        public void OnActionExecuted(ActionExecutedContext context)
        {
            // perform some business logic work
            var myResult = (OkObjectResult)context.Result;

            //Add type checking here... sample code only
            //Modiy object values
            try
            {
                Student myVal = (Student)myResult.Value;
                myVal.Name = "Johnny";
            }
            catch { }
        }
    }
}

在 web api asp.net 核心中修改 OnActionExecuted 中 ActionExecutedContext 的结果

Modifying the result from ActionExecutedContext inside OnActionExecuted in web api asp.net core

asp.net-core-webapi

asp.net-core-2.1

custom-action-filter

onactionexecuted