Web API赢得';t返回对象
本文关键字:返回 对象 API 赢得 Web | 更新日期: 2023-09-27 18:26:59
我有一个非常简单的Web API应用程序。似乎所有的东西都是基本类型的。你不会发现任何花哨的身份验证或任何东西,但我可以在IIS Express上使用运行它
- http://localhost:25095/Workbench/GetObject,或者:
- http://localhost:25095/Workbench/GetNumber
当我启动这个web应用程序时,我可以将浏览器指向GetNumber,并在窗口中看到15
。但是,当我指向GetObject时,我会看到WebAPI.DemoApp.SampleObject
。这并不一定困扰我,只是我很困惑为什么。
我有一个代码(显示进一步向下),假定它强制Web API返回JSON。因此,无论是GetNumber还是GetObject,我都希望返回类似(伪代码)的内容:
- {15}
- {姓名:JoeOb}
无论哪种方式,我的控制台应用程序的ReadAsStringAsync都会产生相同的结果,而ReadAsAsync会产生错误:
- 没有MediaTypeFormatter可用于从媒体类型为"text/html"的内容中读取"SampleObject"类型的对象
我的控制台应用程序非常简单:
static void Main(string[] args)
{
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("http://localhost:25095/");
client.DefaultRequestHeaders.Accept.Clear();
client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
//HttpResponseMessage response = client.GetAsync("Workbench/GetObject").Result;
HttpResponseMessage response = client.GetAsync("Workbench/GetNumber").Result;
//SampleObject getObject = response.Content.ReadAsAsync<SampleObject>().Result;
var getNumber = response.Content.ReadAsStringAsync().Result;
Console.WriteLine(getNumber);
Console.Read();
}
}
我想提到的是,这个项目最初是作为一个生成的ASP.NetWeb API项目(没有Azure)。从那时起,一切都在走下坡路。我以为我是在强迫Web API只返回JSON,但这一切都没有像我预期的那样起作用。
实际上,所有代码都在Global.asax.cs文件中,我将其复制/粘贴到下面:
using System;
using System.Collections.Generic;
using System.Net.Http;
using System.Net.Http.Formatting;
using System.Net.Http.Headers;
using System.Runtime.Serialization;
using System.Web.Http;
using System.Web.Mvc;
namespace WebAPI.DemoApp
{
public class WebApiApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
System.Web.Routing.RouteTable.Routes.MapRoute(
name: "Default",
url: "{controller}/{action}",
defaults: new { controller = "Workbench", action = "GetObject", id = UrlParameter.Optional }
);
var jsonFormatter = new JsonMediaTypeFormatter();
GlobalConfiguration.Configuration.Services.Replace(typeof(IContentNegotiator), new JsonContentNegotiator(jsonFormatter));
}
}
public class JsonContentNegotiator : IContentNegotiator
{
private readonly JsonMediaTypeFormatter _jsonFormatter;
public JsonContentNegotiator(JsonMediaTypeFormatter formatter)
{
_jsonFormatter = formatter;
}
public ContentNegotiationResult Negotiate(Type type, HttpRequestMessage request, IEnumerable<MediaTypeFormatter> formatters)
{
var result = new ContentNegotiationResult(_jsonFormatter, new MediaTypeHeaderValue("application/json"));
return result;
}
}
public class WorkbenchController : Controller
{
public SampleObject GetObject()
{
return (new SampleObject() { Name = "JoeBob" });
}
public int GetNumber()
{
return 15;
}
}
}
Web.config同样简单:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<appSettings></appSettings>
<system.web>
<authentication mode="None" />
<compilation debug="true" targetFramework="4.5"/>
<httpRuntime targetFramework="4.5" />
</system.web>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-5.2.0.0" newVersion="5.2.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>
除了Stripped-down引用(我删除了所有OWIN引用)之外,项目中几乎没有其他内容。
我的目标只是将我的对象转移到控制台应用程序。
PS:SampleObject存在于两个项目之间共享的一个单独的DLL中。
[DataContract]
public class SampleObject
{
[DataMember]
public string Name { get; set; }
}
事实证明,要返回对象,需要从ApiController
继承,而不是从Controller
继承。这也意味着我的App_Start必须具有:
GlobalConfiguration.Configure(WebApiConfig.Register);
并执行您在默认Web API应用程序中看到的配置:
public static class WebApiConfig
{
public static void Register(HttpConfiguration config)
{
config.MapHttpAttributeRoutes();
config.Routes.MapHttpRoute(
name: "DefaultApi",
routeTemplate: "api/{controller}/{id}",
defaults: new { id = RouteParameter.Optional }
);
}
}