c# - WebAPI 通过传递参数未在 Controller 上找到任何操作

Question

HomeController.cs

 class HomeController : ApiController
    {
        [HttpGet]
        public IHttpActionResult GetData(string name)
        {
            if (string.IsNullOrWhiteSpace(name))
            {
                throw new ArgumentNullException("username can not be empty");
            }
            return Ok("Test Done");
        }
    }

StartUp.cs

public void Configuration(IAppBuilder appBuilder)
        {           
            HttpConfiguration config = new HttpConfiguration();
            config.MapHttpAttributeRoutes();


            config.Routes.MapHttpRoute(
              name: "GetData",
              routeTemplate: "V2/{controller}/{name}",
              defaults: new { controller = "Home", action = "GetData" }
              );

            appBuilder.UseWebApi(config);
        }

获取错误:

{
  "Message": "No HTTP resource was found that matches the request URI 'http://localhost:4057/V2/Home/GetData/'.",
  "MessageDetail": "No type was found that matches the controller named 'Home'."

Answer 1

这里的问题很简单。你的类的访问修饰符非常严格

 class HomeController : ApiController
    {

默认访问修饰符是内部的，这意味着它不可公开访问。

尝试将访问修饰符更改为 public 以公开服务。

public class HomeController : ApiController
        {

我可以使用 postman 和我现有的网络 API 来复制您的问题。

来 self 的 postman 的错误: