使用 IHttpActionResult 删除函数

Question

我想在 ASP.NET MVC 中创建一个删除函数。我不太确定如何使用 IHttpActionResult 在 ASP.NET.MVC 中创建删除函数。 (sql)、dBConnection.SubjectCodes.Remove(subjectCodeList);有错误 dBConnection.SaveChanges();.

错误说明：

数据库连接不包含 SubjectCodes 的定义

using System.Collections.Generic;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Web.Http.Cors;
using System.Data;
using System.Linq;
using SubjectAPI.Models;

namespace SubjectAPI.Controllers
{

    [EnableCors(origins: "*", headers: "*", methods: "*")] 
        [RoutePrefix("api/Subject")]
        public class SubjectController : ApiController
        {
            public List<SubjectCode> SubjectCodes;

        [ActionName("DeleteSubject")]
            [Route("DeleteSubject")]
            public IHttpActionResult DeleteSubject(int Subject_Code_ID)
            {
                    DBConnection dBConnection = new DBConnection();
                    DataTable subjectCodeList = dBConnection.GetSqlDataTable(sql);                  

                    dBConnection.SubjectCodes.Remove(subjectCodeList);
                    dBConnection.SaveChanges();

                    return Ok(subjectCodeList);
            }
    }
}


using System;
using System.Web;
using System.Collections.Generic;
using System.Linq;


namespace SubjectAPI.Models
{
    public class SubjectCode
    {
        public int Class_Code_ID { get; set; }
    public string Subject_Code { get; set; }
        public string Subject_Name { get; set; }
        public Nullable<bool> Delete_Status { get; set; }        
    }
}

Answer 1

DeleteSubject 方法将int Subject_Code_ID 作为参数，但看起来您正在尝试删除subjectCodeList。尝试获取与 Subject_Code_ID 匹配的单个主题代码并删除它。

编辑：我需要查看 SubjectCode 和 DBConnection 类来给你一个具体的例子。根据这些工作方式，您可能需要以下内容：

DataTable subjectCodeList = dBConnection.GetSqlDataTable(sql);
var subjectCodeToDelete = subjectCodeList.Rows.Find(Subject_Code_ID);
if (subjectCodeToDelete == null)
    {
        return NotFound();
    }
dBConnection.SubjectCodes.Remove(subjectCodeToDelete);
dBConnection.SaveChanges();