Question

我正在学习本教程：

http://www.asp.net/web-api/overview/web-api-routing-and-actions/create-a-rest-api-with-attribute-routing

并查看“获取书籍详细信息”部分。

我看到了这段代码：

[HttpGet("api/books/{id}/details")]
public BookDetailDto GetBookDetail(int id)
{
}

然而我收到错误

HttpGet有0个参数但是用1个参数调用

（我在ASP .net 4.0 WebAPI上）

指定路线的/详细信息部分的新方法是什么？

我的nuget：

  <package id="Microsoft.AspNet.Mvc" version="4.0.20710.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.Mvc.FixedDisplayModes" version="1.0.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.Providers.Core" version="1.2" targetFramework="net40" />
  <package id="Microsoft.AspNet.Providers.LocalDB" version="1.1" targetFramework="net40" />
  <package id="Microsoft.AspNet.Razor" version="2.0.20715.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.Web.Optimization" version="1.0.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.WebApi" version="4.0.20710.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.WebApi.Client" version="4.0.20710.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.WebApi.Core" version="4.0.20710.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.WebApi.HelpPage" version="4.0.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.WebApi.OData" version="4.0.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.WebApi.Tracing" version="4.0.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.WebApi.WebHost" version="4.0.20710.0" targetFramework="net40" />
  <package id="Microsoft.AspNet.WebPages" version="2.0.20710.0" targetFramework="net40" />

尝试升级到WEBAPI的测试版

update-Package : Could not install package 'Microsoft.AspNet.WebApi.Client 5.0.0-beta2'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.0', but the package does not contain any assembly references or content files
that are compatible with that framework. For more information, contact the package author.

Update-Package : Updating 'Microsoft.AspNet.Mvc 4.0.30506.0' to 'Microsoft.AspNet.Mvc 5.0.0-beta2' failed. Unable to find a version of 'Microsoft.AspNet.Mvc.FixedDisplayModes' that is compatible with 'Microsoft.AspNet.Mvc 5.0.0-beta2'.
Update-Package : Updating 'Microsoft.AspNet.Mvc 4.0.30506.0' to 'Microsoft.AspNet.Mvc 5.0.0-beta2' failed. Unable to find a version of 'Microsoft.AspNet.Mvc.FixedDisplayModes' that is compatible with 'Microsoft.AspNet.Mvc 5.0.0-beta2'.

通过重新定位到4.5并删除FixedDisplayModes包

来修复这些问题

Answer 1

您的包列表显示您正在使用ASP.NET Web API 1. ASP.NET Web API 2中提供了对属性路由的支持，它是Visual Studio 2013 Preview的一部分测试版。如果你想玩它，你有三种方法可以做到这一点：

将软件包管理器窗口值顶部的下拉列表从“仅稳定”更改为“包含预发布”，并将软件包升级到Microsoft ASP.NET Web API 5.0.0-beta2（有时Microsoft ASP.NET MVC Fixed DisplayModes软件包阻止更新，因此您可能会尝试先删除它）
将您的项目切换为ASP.NET Web API Nightly Builds
Download并安装Visual Studio 2013预览版，其中包含适当的参考资料和新模板。

c＃webapi httpget属性

1 个答案: