将Asp.Net MVC控制器转换为Web API的最佳方法

bob.mazzo 发表于 Dev

鲍勃

我有这个ASP.NET MVC 5项目，正在使用MS Web Api转换为AngularJS。

现在，在旧项目中，我有这些类型的c＃控制器Controller，但是在我的新项目中，我创建了一些新的类型的Web Api控制器ApiController。

现在，我想在新项目中重用旧的控制器代码。这就是我的困惑。

当我尝试将旧的控制器代码移植到Web Api控制器时，遇到一些前端$http请求错误。

这是我的AngulardataService工厂中的一个函数，它使http请求降为'api/Whatif/SummaryPortfolios'：

function getCurrPortfoliosLIst() {
  var deferred = $q.defer();

  var url = 'api/Whatif/SummaryPortfolios';
  var req={
    method: 'POST',
    url: url,
    headers: {
      'Content-Type': 'application/json',
    },
    data:{}
  };
  $http(req).then(function (resp){
    deferred.resolve(resp.data);
  }, function(err){
    console.log('Error from dataService: ' + resp);
  });
}

但是$http错误部分返回此异常：

data: Object
ExceptionMessage: "Multiple actions were found that match the request: 
↵SummaryPortfolios on type MarginWorkbenchNG.Controllers.WhatifController
↵Post on type MarginWorkbenchNG.Controllers.WhatifController"
ExceptionType: "System.InvalidOperationException"
Message: "An error has occurred."
StackTrace: "   at System.Web.Http.Controllers.ApiControllerActionSelector.ActionSelectorCacheItem.SelectAction(HttpControllerContext controllerContext)
↵   at System.Web.Http.Controllers.ApiControllerActionSelector.SelectAction(HttpControllerContext controllerContext)
↵   at System.Web.Http.ApiController.ExecuteAsync(HttpControllerContext controllerContext, CancellationToken cancellationToken)
↵   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()

这是我要调用的c＃API控制器，但我需要弄清楚如何创建除直接Get（）和Post（）方法之外的方法：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.Http;
using Microsoft.AspNet.Identity;
using NLog;
using Microsoft.AspNet.Identity.Owin;
using MarginWorkbenchNG.Models;
using Rz.DAL;
using Rz.DAL.Integration;
using Rz.DAL.Models;
using Rz.DAL.Models.Rz;

namespace MarginWorkbenchNG.Controllers
{
    public class WhatifController : ApiController
    {
		public IEnumerable<string> Get()
			{						 
				return new string[] { "value1", "value2" };
			}
		[HttpPost]
        public List<WhatifSummaryViewModel> SummaryPortfolios(string filterValue = "", int? whatIfBatchNumber = null, bool includeBaseline = true)
        {
            // Get portfolios from Rz
            IEnumerable<Portfolio> portfolios = GetPortfolios(filterValue, whatIfBatchNumber, includeBaseline)
                .Where(x => x.PortfolioKeys.Any(k => k.Type == Settings.Whatif.SidebarPortfolioKey && k.DisplayValue == filterValue));

            // View Model
            List<WhatifSummaryViewModel> model = new List<WhatifSummaryViewModel> { };

            /// additional code here...

            return model;
        }
	}
}

当然，旧的控制器（来自MVC5项目）看起来略有不同，因为该_Summary方法是类型的ActionResult并且返回a Partial：

public class WhatifController : Controller
    {
      
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult _Summary(string filterValue = "", int? whatIfBatchNumber = null, bool includeBaseline = true)
        {
            // Get portfolios from Razor
            IEnumerable<Portfolio> portfolios = GetPortfolios(filterValue, whatIfBatchNumber, includeBaseline)
                .Where(x => x.PortfolioKeys.Any(k => k.Type == Settings.Whatif.SidebarPortfolioKey && k.DisplayValue == filterValue));

            // View Model
            List<WhatifSummaryViewModel> model = new List<WhatifSummaryViewModel> { };

           // additional code removed for brevity...

            return PartialView(model.OrderBy(x => x.Title).ThenBy(x => x.SubTitle));
        }

我的RouteConfig.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace MarginWorkbenchNG
{
  public class RouteConfig
  {
    public static void RegisterRoutes(RouteCollection routes)
    {
      routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

      routes.MapRoute(
        name: "Default",
        url: "{controller}/{action}/{id}",
        defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
      );
    }
  }
}

旧项目还使用Html表单提取URL，例如：

 <form id="whatif-summary-form" action="@Url.Action("_Summary", "WhatIf")" method="POST"></form>

然后action在JavaScript（非Angular）中构建ajax请求时拉出attrib以获得URL：

url: form.prop("action")

安德鲁·M。

这是您的整个ApiController吗？您收到的错误消息是因为您的ApiController具有几种相同类型的方法，并且无法确定要路由到哪个方法。要测试这一点，请执行以下操作：注释掉您要调用的控制器方法之外的所有方法。您不应该再收到该错误。

这是一个简单的解决方法，只需告诉Web API如何映射路线即可。将属性[[Route（“ yourroute'）]]'添加到您的方法中，它应该可以工作。

    public class WhatifController : ApiController
    {
        [HttpPost, Route("Your Route Goes here 'SummaryPortfolios'")]
        public IHttpActionResult SummaryPortfolios(string filterValue = "", int? whatIfBatchNumber = null, bool includeBaseline = true)
        {
            // Get portfolios from Rz
            IEnumerable<Portfolio> portfolios = GetPortfolios(filterValue, whatIfBatchNumber, includeBaseline)
                .Where(x => x.PortfolioKeys.Any(k => k.Type == Settings.Whatif.SidebarPortfolioKey && k.DisplayValue == filterValue));

            // View Model
            List<WhatifSummaryViewModel> model = new List<WhatifSummaryViewModel> { };

            /// additional code here...

            return Ok(model);
        }
    }