System.InvalidOperationException：'没有为实体类型'HealthCheck'找到合适的构造函数

Question

尝试通过EF Core在我的数据库上添加内容时出现此错误。

System.InvalidOperationException：'找不到实体类型'HealthCheck'的合适构造函数。以下构造函数具有无法绑定到实体类型属性的参数：无法在'HealthCheck（字符串标题，字符串hctype，字符串链接）'中绑定'hctype'。

这是我的HealthCheck课程：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Application.Models
{
    public class HealthCheck
    {
        public HealthCheck(string title, string hctype, string link)
        {
            Title = title;
            HCType = hctype;
            Link = link;
        }

        public int Id { get; set; }
        public string Title { get; set; }
        public string HCType { get; set; }
        public string Link { get; set; }
    }
}

我的RepositoryContext

using Microsoft.EntityFrameworkCore;
using Application.Models;

namespace Application.Repository
{
    public class RepositoryContext : DbContext
    {
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer(
                @"Server=(localdb)\mssqllocaldb;Database=healthcheck;Integrated Security=True");
        }

        //public DbSet<HealthCheck> HealthChecks { get; set; }
        //public DbSet<UserHealthCheck> UserHealthChecks { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.Entity<HealthCheck>().ToTable("HealthCheck");
            modelBuilder.Entity<UserHealthCheck>().ToTable("UserHealthCheck");
        }
    }
}

我的存储库

using Application.Models;

namespace Application.Repository
{
    public class Repository
    {
        public void InsertHealthCheck(HealthCheck healthCheck)
        {
            using (var db = new RepositoryContext())
            {
                db.Add(healthCheck);
                db.SaveChanges();
            }
        }
    }
}

这就是调用“InsertHealthCheck（）”的地方

[Route("/api/HealthCheck/Website")]
        [HttpPost]
        public ActionResult WebsiteStatus([FromBody] WebsiteDataModel websiteData)
        {
            HealthCheck data = new HealthCheck(websiteData.Title, "Website", websiteData.Url);
            try
            {
                HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(websiteData.Url);
                HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
                HttpStatusCode HealthCheckStatusCode = myHttpWebResponse.StatusCode;
                myHttpWebResponse.Close();
                return Ok(HealthCheckStatusCode);
            }
            catch(UriFormatException)
            {
                return Ok("Check url.");
            }
            catch (Exception)
            {
                return Ok("400");
            }
            finally
            {
                repository.InsertHealthCheck(data);
            }
        }

如果你能帮助我，我会很感激，如果你需要我发布代码的任何其他部分只是问。

另外，我刚刚开始学习EF Core，所以如果我做了一些非常愚蠢的事情，请指出它

Answer 1

你缺少空构造函数：

public class HealthCheck
{
   // here
   public HealthCheck()
   {
   }

   public HealthCheck(string title, string hctype, string link)
   {
       Title = title;
       HCType = hctype;
       Link = link;
   }

   public int Id { get; set; }
   public string Title { get; set; }
   public string HCType { get; set; }
   public string Link { get; set; }


}

试试吧

Answer 2

由于HealthCheck类在数据库中表示一个表，因此您必须提供一个空构造函数。 尝试以下实现，如果您仍然收到相同的错误，请告诉我：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Application.Models
{
    public class HealthCheck
    {
        public HealthCheck()
        {
        }

        public HealthCheck(string title, string hctype, string link)
        {
            Title = title;
            HCType = hctype;
            Link = link;
        }

        public int Id { get; set; }
        public string Title { get; set; }
        public string HCType { get; set; }
        public string Link { get; set; }
    }
}