Question

使用MVC4，我能够创建并注册一个全局动作过滤器，该过滤器将在动作执行之前检查模型状态，并在任何损坏发生之前返回序列化的ModelState。

public override void OnActionExecuting(System.Web.Http.Controllers.HttpActionContext actionContext)
{
    if (!actionContext.ModelState.IsValid)
    {
        actionContext.Request.CreateErrorResponse(HttpStatusCode.BadRequest, actionContext.ModelState);
    }
}

然而，使用MVC5，我无法找到Request因此CreateErrorResponse

public override void OnActionExecuting(ActionExecutingContext nActionExecutingContext)
{
    if (!nActionExecutingContext.Controller.ViewData.ModelState.IsValid)
    {
        nActionExecutingContext.Result = // Where is Request.CreateErrorResponse ?
    }
}

我意识到我可以创建一个自定义响应类来分配给Result，但如果CreateErrorResponse仍然可用，我宁愿使用内置的。

我想知道哪些地方相对于MVC5 / Web API 2中的ActionExecutingContext？

Answer 1

根据this回答，您的解决方案是：

using System.Web.Mvc;

public class ValidateModelAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext filterContext)
    {
        if (!filterContext.Controller.ViewData.ModelState.IsValid)
        {
            // This (contain view data and validation error in the form): 
            filterContext.Result = new ViewResult()
            {
                ViewData = filterContext.Controller.ViewData,
                ViewName = filterContext.ActionDescriptor.ActionName
            };

            // Or this (just redirect to requested action): 
            filterContext.Result = new RedirectResult(filterContext.ActionDescriptor.ActionName);

            // Or this (just add http status code):
            filterContext.Result = new HttpStatusCodeResult(HttpStatusCode.BadRequest);  
        }
    }
}

Answer 2

必须

using System.Net.Http;

代替

using System.Web.Http;

然后这有效：

using System.Net;
using System.Net.Http;
using System.Web.Http.Controllers;
using System.Web.Http.Filters;

public class ValidateModelStateAttribute : ActionFilterAttribute
{
    public override void OnActionExecuting(HttpActionContext actionContext)
    {
        if (!actionContext.ModelState.IsValid)
        {
            actionContext.Response = actionContext.ControllerContext.Request.CreateErrorResponse(HttpStatusCode.BadRequest, actionContext.ModelState);
        }
    }
}

自定义ActionFilterAttribute OnActionExecuting中的MVC5 / API2 CreateErrorResponse

2 个答案: