c# - 使用 Azure SQL Server 创建 Web API

Question

我试过这个tutorial对于我的 xamarin 应用程序，使用此代码:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
namespace XamarinLogin.Controllers
{
    public class ControllerNameController : ApiController
    {
        // GET: api/ControllerName
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2" };
        }

        // GET: api/ControllerName/5
        public string Get(int id)
        {
            return "value";
        }

        // POST: api/ControllerName
        public void Post([FromBody]string value)
        {
        }

        // PUT: api/ControllerName/5
        public void Put(int id, [FromBody]string value)
        {
        }

        // DELETE: api/ControllerName/5
        public void Delete(int id)
        {
        }
         xamarinloginEntities db = new xamarinloginEntities();  

        [HttpPost]  
        [ActionName("XAMARIN_REG")]  
        // POST: api/Login  
        public HttpResponseMessage Xamarin_reg(string username, string password)  
        {  
            Login login = new Login();  
            login.Username = username;  
            login.Password = password;  
            db.Logins.Add(login);  
            db.SaveChanges();  
            return Request.CreateResponse(HttpStatusCode.Accepted, "Successfully Created");  
        }  
        [HttpGet]  
        [ActionName("XAMARIN_Login")]  
        // GET: api/Login/5  
        public HttpResponseMessage Xamarin_login(string username, string password)  
        {  
            var user = db.Logins.Where(x => x.Username == username && x.Password == password).FirstOrDefault();  
            if (user == null)  
            {  
                return Request.CreateResponse(HttpStatusCode.Unauthorized, "Please Enter valid UserName and Password");  
            }  
            else  
            {  
                return Request.CreateResponse(HttpStatusCode.Accepted, "Success");  
            }  
        }  

    }
}

我已经完全按照教程进行操作，但仍然收到错误消息，这是错误消息，

The type or namespace name xamarinloginentities could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name Login could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name xamarinloginentities could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name Login could not be found (are you missing a using directive or an assembly reference?)

如您所见，Login 和 xamarinloginentities 是我的 ADO.NET 实体数据模型，问题是如何获取此错误消息。

Answer 1

The type or namespace name xamarinloginentities could not be found (are you missing a using directive or an assembly reference?)

根据我的理解，类名(例如 xamarinloginEntities )需要区分大小写。此外，如果您按照您提供的教程进行操作，则 ASP.NET 实体数据模型将在 your Project Name -> Models 下定义。 ，为您ControllerNameController.cs ，您需要添加命名空间引用，如下所示:

using XamarinLogin.Models;