Question

我正在整理一个相当简单的Code-First MVC5库存跟踪应用程序。我已将我的应用程序发送到Seed（）和所有维护表（位置，供应商，状态等），我可以查看/创建/编辑/删除。我现在正在处理我的主[INV_Assets]模型的View，但是当我尝试运行我收到的应用程序时：

System.Data.DataException ：An exception occurred while initializing the database. See the InnerException for details.

InnerException ：The underlying provider failed on Open.

我的HomeController：

中的错误发生在下方

    TrackerContext _db = new TrackerContext();
    public ActionResult Index(INV_Assets defModel)
    {
        var assetList = _db.INV_Assets.ToList(); // EXCEPTION!
        return View(assetList);
    }

我试图将我的主模型[INV_Assets]传递给视图，以便我可以foreach遍历模型类中的所有实例并将它们显示在表中。谁能看到我可能做错了什么？

下面我还包括我的模型本身[INV_Assets]和View：

INV_Assets ：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using GridMvc.DataAnnotations;
using System.Web.Mvc;
using Tracker.Models;

namespace Tracker.Models
{
    [GridTable(PagingEnabled = true, PageSize = 30)]
    public class INV_Assets 
    {
        // Setting GridColumn Annotations allows you to use AutoGenerateColumns on view to auto create the Grid based on the model.


        public int Id { get; set; }

        public int Model_Id { get; set; }
        [ForeignKey("Model_Id")]
        public virtual INV_Models Model { get; set; }

        [Required]
        public int Manufacturer_Id { get; set; }
        [ForeignKey("Manufacturer_Id")]
        public virtual INV_Manufacturers Manufacturer { get; set; }

        [Required]
        public int Type_Id { get; set; }
        [ForeignKey("Type_Id")]
        public virtual INV_Types Type { get; set; }

        [Required]
        public int Location_Id { get; set; }
        [ForeignKey("Location_Id")]
        public virtual INV_Locations Location { get; set; }

        public int Vendor_Id { get; set; }
        [ForeignKey("Vendor_Id")]
        public virtual INV_Vendors Vendor { get; set; }

        [Required]
        public int Status_Id { get; set; }
        [ForeignKey("Status_Id")]
        public virtual INV_Statuses Status { get; set; }

        public string ip_address { get; set; }

        public string mac_address { get; set; }

        public string note { get; set; }
        public string owner { get; set; }
        public decimal cost { get; set; }
        public string po_number { get; set; }
        public string description { get; set; }

        public int invoice_number{ get; set; }

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

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

        [DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}")]
        public DateTime? acquired_date { get; set; }

        [DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}")]
        public DateTime? disposed_date { get; set; }

        [Required]
        [DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}")]
        public DateTime created_date { get; set; }

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

        [DisplayFormat(DataFormatString = "{0:MM/dd/yyyy}")]
        public DateTime modified_date { get; set; }

        public string modified_by { get; set; }

        // Flag to specify if item is available? (Not signed out, not auctioned, recycled, etc.)
        //public bool available { get; set; }
    }
}

[INV_Assets]查看：

@using GridMvc.Html
@using System.Collections.Generic
@model  List<Tracker.Models.INV_Assets>

@{
    ViewBag.Title = "Home Page";
}
<table style="width:100%;">

@foreach (var item in Model) {
    <tr>
        <td>@Html.DisplayFor(modelItem => item.Status)</td>
        <td>@Html.DisplayFor(modelItem => item.Location)</td>
        <td>@Html.DisplayFor(modelItem => item.owner)</td>
        <td>@Html.DisplayFor(modelItem => item.Type)</td>
        <td>@Html.DisplayFor(modelItem => item.Manufacturer)</td>
        <td>@Html.DisplayFor(modelItem => item.Model)</td>
        <td>@Html.DisplayFor(modelItem => item.Vendor)</td>
        <td>@Html.DisplayFor(modelItem => item.description)</td>
        <td>@Html.DisplayFor(modelItem => item.asset_tag_number)</td>
        <td>@Html.DisplayFor(modelItem => item.serial_number)</td>
        <td>@Html.DisplayFor(modelItem => item.ip_address)</td>
        <td>@Html.DisplayFor(modelItem => item.mac_address)</td>
        <td>@Html.DisplayFor(modelItem => item.po_number)</td>
        <td>@Html.DisplayFor(modelItem => item.invoice_number)</td>
        <td>@Html.DisplayFor(modelItem => item.cost)</td>
        <td>@Html.DisplayFor(modelItem => item.note)</td>
        <td>@Html.DisplayFor(modelItem => item.acquired_date)</td>
        <td>@Html.DisplayFor(modelItem => item.disposed_date)</td>
        <td>@Html.DisplayFor(modelItem => item.created_date)</td>
        <td>@Html.DisplayFor(modelItem => item.created_by)</td>
        <td>@Html.DisplayFor(modelItem => item.modified_date)</td>
        <td>@Html.DisplayFor(modelItem => item.modified_by)</td>
    </tr>
}

</table>

修改：

我有ELMAH错误日志记录正在运行，在异常发生后我点击继续后，日志显示如下：

System.Data.SqlClient.SqlException - Cannot attach the file 'C:\Analytic-Projects\Tracker\Tracker-DEV\Tracker\Tracker\App_Data\TrackerDBDev.mdf' as database 'TrackerDBDev'. ...

Answer 1

您没有发布的一件事是唯一需要的东西：Web.config中的连接字符串。由于您的数据库在错误中有.mdf扩展名，我猜您已经部署了项目，现在无法连接到数据库。像这样的数据库文件由LocalDB使用，只能在Visual Studio的范围内使用。部署到生产服务器后，您的项目必须使用成熟的数据库，如SQL Server。您只需要在Web.config中更改项目的连接字符串（或者更好，比如Web.Release.config，因此可以在发布过程中转换Web.config），以便它指向包含完整的SQL Server实例你的应用程序的数据库。

MVC5传递模型查看：底层提供程序在Open上失败了吗？

1 个答案: