Microsoft.Data.SqlClient.SqlException - 无效的 object 名称“GuestList”。

Question

我的数据库有一个大问题，我无法从 web 页面写入。 我正在使用 Dapper 作为我的 ORM 如果这有什么不同？

db.Insert(guest.EditableGuest); 给了我无效的 object 错误 但如果我将其更改为 db.InsertAsync(guest.EditableGuest); 该错误自行解决但我无法将其添加到数据库中，并且由于某种原因它不会显示在我在数据库中有客人列表的页面上？

我决定重新输入页面以防出现问题，VS有时似乎有点挑剔，有一天我出错了，关闭应用程序，重新打开它就可以了？ 不幸的是，没有用这个。

访客列表控制器

using Dapper.Contrib.Extensions;
    using FYP_RSVP_MGMT.Helpers;
    using FYP_RSVP_MGMT.Models;
    using FYP_RSVP_MGMT.ViewModels;
    using Microsoft.AspNetCore.Mvc;
    using System.Linq;

    namespace FYP_RSVP_MGMT.Controllers
    {
        public class GuestListController : Controller
        {
            public IActionResult Index()
            {
                GuestListViewModel guest = new GuestListViewModel();

               return View("Index", guest);
    }

    /* Create or Update a guest RSVP Response */

    public IActionResult CreateUpdate(GuestListViewModel guest)
    {
        if (ModelState.IsValid)
        {
            using (var db = DbHelpers.GetConnection())
            {
                /* If a guestID is null, the number of existing guests will be counted
                 * in order to determine what the next guestID will be and will be added 
                 * asynchronously to the DB in case other actions are on going at the same time */
                 
                if (guest.EditableGuest.GuestID == null)
                {
                    guest.EditableGuest.GuestID = guest.Guests.Count;

                    db.Insert<GuestList>(guest.EditableGuest);
                }

                /* If the guest already exists, we are updating their details */
                else
                {
                    GuestList dbItem = db.Get<GuestList>(guest.EditableGuest.GuestID);

                    TryUpdateModelAsync<GuestList>(dbItem, "EditableGuest");

                    db.Update<GuestList>(dbItem);
                }
            }

            /* When a guest submits their RSVP response, it will bring them to the View Guests page - TEMPORARY MEASURE */
            return RedirectToAction("ViewGuestList", guest);
        }

        else
        {
            return View("ViewGuestList", new GuestList());
        }
    }

除此之外，还有更多用于编辑和删除的代码，并且页面没有抛出任何错误，所以一切都很好。

这是我的数据库助手 class

public class DbHelpers
{
    public static SqlConnection GetConnection()
    {
        return new SqlConnection(@"Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=WeddingDB;");
    }
}

嘉宾名单 Model

public class GuestList
{
    [ExplicitKey]
    public int? GuestID { get; set; }

    [Required]
    public string GuestName { get; set; }

    [Required]
    public string GuestType { get; set; }

    [Required]
    public string ContactDetails { get; set; }

    public bool PlusOne { get; set; }

    public string PlusOneName { get; set; }

    [Required]
    public string GuestResponse { get; set; }
}

访客列表视图模型

 public class GuestListViewModel
{
    /* Creating a new List of all Guests 
     Editable Guest will hold any instance of an object from the list
            that is being added/edited/deleted etc */
    public List<GuestList> Guests { get; set; }

   
    public GuestList EditableGuest { get; set; }


    /* Selecting all of the existing guests from the DB */
    public GuestListViewModel()
    {
        using (var db = DbHelpers.GetConnection())
        {
            this.EditableGuest = new GuestList();

            this.Guests = db.Query<GuestList>("Select * From GuestList").ToList();
        }
    }

 
}

来宾列表视图

@model FYP_RSVP_MGMT.ViewModels.GuestListViewModel

    @{
        ViewData["Title"] = "Guest RSVP";
     }

    @* Form to submit RSVP Response *@

    @using (var form = Html.BeginForm("CreateUpdate", "GuestList", FormMethod.Post))
    {
<div class="container" id="GuestRSVP">

    <br />
    <br />
    <br />

    @* The Bride and Groom name plus Wedding Details will eventually change 
        depending on the log in details *@

    <h3> Welcome to [Bride] and [Groom]'s Wedding</h3>
    <h4>[Church Location]</h4>
    <h4>[Wedding Date and Time]</h4>

    <div class="container" id="RSVPTable" style="align-content:center">

        <table>

            <tr>
                <td>Guest Name: </td>
                <td>@Html.TextBoxFor(m => m.EditableGuest.GuestName)</td>

            </tr>

            <tr>
                <td>Guest Type: </td>
                <td>@Html.DropDownListFor(m => m.EditableGuest.GuestType, new List<SelectListItem> { new SelectListItem { Value = "Guest", Text = "Guest" }, new SelectListItem { Value = "Wedding Party", Text = "Wedding Party" } })</td>
            </tr>

            <tr>
                <td>Email Address: </td>
                <td>@Html.TextBoxFor(m => m.EditableGuest.ContactDetails)</td>
            </tr>

            <tr>
                <td>Plus One: </td>
                <td>@Html.CheckBoxFor(m => m.EditableGuest.PlusOne)</td>
            </tr>

            <tr>
                <td>Plus One Name: </td>
                <td>@Html.TextBoxFor(m => m.EditableGuest.PlusOneName)</td>
            </tr>

            <tr>
                <td>RSVP Response:</td>
                <td>@Html.DropDownListFor(m => m.EditableGuest.GuestResponse, new List<SelectListItem> { new SelectListItem { Value = "Accept", Text = "Accept with Pleasure" }, new SelectListItem { Value = "Decline", Text = "Decline with Regret" } })</td>
            </tr>

        </table>

        <br/>

        <button class="btnSubmitRSVP" type="submit" style="text-align:center"> <a asp-controller="GuestList" asp-action="CreateUpdate"></a> @(Model.EditableGuest.GuestID > 0? "Update": "Submit Response") </button>


    </div>


</div>

}

我发送某些页面的位置可能有点奇怪，就像客人 RSVPing 不应该被带到他们可以看到其他客人和他们的回复的页面，但这只是暂时的。 这会影响我的代码吗，肯定不会？ 我的代码中没有任何地方有 GuestLists，所以我不明白它在哪里捡到这个？ 如果需要，我可以提供更多代码。

提前谢谢你的帮助！

编辑：这是数据库的图片

Answer 1

Dapper 假设一个复数表名。 在 GuestList model class 中使用 '[Table("GuestList")]' 属性。