ASP.NET WebApi：(405)方法不允许

我有一个Web Api控制器.它表现得很奇怪.当我使用PostMan时,我可以在Web Api上访问POST方法,但是当我从.net使用HttpWebRequest时,它返回(405)Method Not Allowed.
我把Web Api代码放在这里：

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web;
using System.Web.Http;

namespace MyProject.Controllers
{
    public class TestController : ApiController
    {
        [HttpPost]
        public int buy(OrderResult value)
        {
            try
            {
                if (value.InvoiceDate != null && value.Result == 1)
                {
                    return 0;
                }
            }
            catch{}

            return -1;
        }
    }

    public class OrderResult
    {
        public int Result { get; set; }
        public long InvoiceNumber { get; set; }
        public string InvoiceDate { get; set; }
        public long TimeStamp { get; set; }
    }
}

这是我的WebApiConfig.cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Http;

namespace MyProject
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {

            config.Routes.MapHttpRoute(
                name: "DefaultApi",routeTemplate: "api/{controller}/{action}/{id}",defaults: new { action = RouteParameter.Optional,id = RouteParameter.Optional }
            );

        }
    }
}

这是我从另一个.NET项目发送POST请求的方式：

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Web;

namespace MyProject.Controllers
{
    public static class WebReq
    {
        public static string PostRequest(string Url,string postParameters)
        {
            try
            {
                HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(Url);
                myReq.Method = "POST";
                myReq.Timeout = 30000;
                myReq.Proxy = null;

                byte[] postData = Encoding.UTF8.GetBytes(postParameters);
                myReq.ContentLength = postData.Length;
                myReq.ContentType = "application/x-www-form-urlencoded";
                using (Stream requestWrite = myReq.GetRequestStream())
                {
                    requestWrite.Write(postData,postData.Length);
                    requestWrite.Close();
                    using (HttpWebResponse webResponse = (HttpWebResponse)myReq.GetResponse())
                    {
                        if (webResponse.StatusCode == HttpStatusCode.OK)
                        {
                            using (Stream str = webResponse.GetResponseStream())
                            {
                                using (StreamReader sr = new StreamReader(str))
                                {
                                    return sr.ReadToEnd();
                                }
                            }
                        }
                        return null;
                    }
                }
            }
            catch (Exception e)
            {
                var message = e.Message;
                return null;
            }
        }

    }
}

我已经在web.config中添加了以下代码：

<modules runAllManagedModulesForAllRequests="true">
  <remove name="WebDAVModule" />
</modules>

这很奇怪,因为我可以从PostMan成功发送POST请求. PostMan将此代码发送到API.

POST /api/Test/buy HTTP/1.1
Host: domain.com
Cache-Control: no-cache
Postman-Token: 9220a4e6-e707-5c5f-ea61-55171a5dd95f
Content-Type: application/x-www-form-urlencoded

InvoiceDate=28012016&Result=1

我将不胜感激任何解决问题的建议.

解决方法

byte[] postData = Encoding.UTF8.GetBytes(postParameters);
            myReq.ContentLength = postData.Length;
            myReq.ContentType = "application/x-www-form-urlencoded";
            using (Stream requestWrite = myReq.GetRequestStream())
            {
                requestWrite.Write(postData,postData.Length);

您很可能不会发送正确的x-www-form-urlencoded请求.您可能无法正确编码从postParameters传入的数据.见Post form data using HttpWebRequest

由于您未根据x-www-form-urlencoded生成有效的OrderResult对象,因此路由选择器不会选择您的Buy操作.这就是你不允许POST的原因.

如果您更改了OrderResult value = null,则可能会进入控制器,因为它现在是可选参数.然而,这不是你想要的,除非你有一个奇怪的控制器,行为如下：

Buy(OrderResult value = null)
{
    if(value== null)
        value = MyCustomDeserializeFromRequestBody(RequestContext)

    ...
}

最后你真的不应该使用这个类,现代开发有更好的结构https://stackoverflow.com/a/31147762/37055 https://github.com/hhariri/EasyHttp我的头顶

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