Question

我想在ASP.NET MVC中创建删除功能。我不太确定如何使用IHttpActionResult在ASP.NET.MVC中创建Delete函数。 (sql)，dBConnection.SubjectCodes.Remove(subjectCodeList);中存在错误 dBConnection.SaveChanges();。

该错误表明：

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方法采用一个int Subject_Code_ID作为参数，但是好像您正在尝试删除一个subjectCodeList。尝试获取与Subject_Code_ID匹配的单个主题代码，然后删除该主题代码。

编辑：我需要查看SubjectCode和DBConnection类为您提供一个具体示例。根据这些工作的方式，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();

使用IHttpActionResult删除函数

1 个答案: