为什么不允许我的 Post 方法？

Question

我已经成功使用这个方法来获取 REST 数据了：

private JArray GetRESTData(string uri)
{
    try
    {
        var webRequest = (HttpWebRequest)WebRequest.Create(uri);
        var webResponse = (HttpWebResponse)webRequest.GetResponse();
        var reader = new StreamReader(webResponse.GetResponseStream());
        string s = reader.ReadToEnd();
        return JsonConvert.DeserializeObject<JArray>(s);
    }
    catch // This method crashes if only one json "record" is found - try this:
    {
        try
        {
            MessageBox.Show(GetScalarVal(uri));
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }
    return null;
}

在 webRequest 和 webResponse 分配之间，我添加了这个：

if (uri.Contains("Post"))
{
    webRequest.Method = "POST";
}

...并用这个 URI 调用它：

http://localhost:28642/api/Departments/PostDepartment/42/76TrombonesLedTheZeppelin

虽然我有一个与之对应的 Post 方法：

控制器

[Route("api/Departments/PostDepartment/{accountid}/{name}/{dbContext=03}")]
public void PostDepartment(string accountid, string name, string dbContext)
{
    _deptsRepository.PostDepartment(accountid, name, dbContext);
}

存储库

public Department PostDepartment(string accountid, string name, string dbContext)
{
    int maxId = departments.Max(d => d.Id);
    // Add to the in-memory generic list:
    var dept = new Department {Id = maxId + 1, AccountId = accountid, Name = name};
    departments.Add(dept);
    // Add to the "database":
    AddRecordToMSAccess(dept.AccountId, dept.Name, dbContext);
    return dept;
}

...失败，“远程服务器返回错误：(405) Method Not Allowed.”

为什么不允许？

更新

根据我在此处找到的内容：http://blog.codelab.co.nz/2013/04/29/405-method-not-allowed-using-asp-net-web-api/，我将其添加到 Web.Config：

  <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true">
      <remove name="WebDAVModule" />
    </modules>
    <handlers>
      <remove name="WebDAV" />
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT" 
type="System.Web.Handlers.TransferRequestHandler" resourceType="Unspecified" requireAccess="Script" 
preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>

...所以它是从这个开始的：

<system.webServer>
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" 
type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
  </system.webServer></configuration>

...到这个：

<system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <modules runAllManagedModulesForAllRequests="true">
      <remove name="WebDAVModule" />
    </modules>
    <handlers>
      <remove name="WebDAV" />
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="GET,HEAD,POST,DEBUG,PUT" 
type="System.Web.Handlers.TransferRequestHandler" resourceType="Unspecified" requireAccess="Script" 
preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
</system.webServer></configuration>

....但没有区别。

更新 2

它甚至无法在 Controller 中调用：

        [HttpPost]
[System.Web.Http.Route("api/Departments/PostDepartment/{accountid}/{name}/{dbContext=03}")]
        public void PostDepartment(string accountid, string name, string dbContext)
        {
            _deptsRepository.PostDepartment(accountid, name, dbContext);
        }

我有一个没有到达的断点...???

更新 3

VirtualBlackFox 的最后一条评论成功了。我只是改变了我的“这是一个帖子吗？”在我的客户端代码中如下：

if (uri.Contains("Post"))
{
    webRequest.Method = "POST";
    webRequest.ContentLength = 0; // <-- This line is all I added
}

...现在它可以工作了。

Answer 1

我不使用 Asp.Net，但我猜您需要指定 HttpPost 属性，如 Attribute Routing / HTTP Methods 文档中所示：

[HttpPost]
[Route("api/Departments/PostDepartment/{accountid}/{name}/{dbContext=03}")]
public void PostDepartment(string accountid, string name, string dbContext)
{
    _deptsRepository.PostDepartment(accountid, name, dbContext);
}

---

在我的电脑上工作的小样本：

TestController.cs：

using System.Web.Http;

namespace WebApplication2.Controllers
{
    public class TestController : ApiController
    {
        [HttpPost]
        [Route("api/Departments/PostDepartment/{accountid}/{name}/{dbContext=03}")]
        public string PostDepartment(string accountid, string name, string dbContext)
        {
            return accountid + name + dbContext;
        }
    }
}

Test.html：

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-2.0.3.min.js"></script>
    <script>
        $(function () {
            $.ajax("api/Departments/PostDepartment/accountid/name/dbContext", {
                type: 'POST', success: function (data) {
                    $('#dest').text(data);
                }
            });
        });
    </script>
</head>
<body>
    <div id="dest"></div>
</body>
</html>

用 C# 调用服务的示例程序：

namespace ConsoleApplication1
{
    using System;
    using System.IO;
    using System.Net;
    using Newtonsoft.Json;

    class Program
    {
        static void Main()
        {
            Console.WriteLine(GetRestData(@"http://localhost:52833//api/Departments/PostDepartment/42/76TrombonesLedTheZeppelin"));
            Console.ReadLine();
        }

        private static dynamic GetRestData(string uri)
        {

            var webRequest = (HttpWebRequest)WebRequest.Create(uri);
            webRequest.Method = "POST";
            webRequest.ContentLength = 0;
            var webResponse = (HttpWebResponse)webRequest.GetResponse();
            var reader = new StreamReader(webResponse.GetResponseStream());
            string s = reader.ReadToEnd();
            return JsonConvert.DeserializeObject<dynamic>(s);

        }
    }
}