c# - ASP.NET MVC /Entity Framework エラー - 列名 'Environment_Id' が無効です

Question

私は ASP.NET MVC と EF を初めて使用します。うまくいけば、これはばかげた質問ではありません。

ビューにモデルを渡すと、このエラーが発生します -例外の詳細: System.Data.SqlClient.SqlException: Invalid column name 'Environment_Id'.

モデルにもデータベース テーブルにも、その名前のプロパティはありません。これについて私を案内してもらえますか？

  **Here is the Version Model Class**

  public partial class Version
  {
    public Version()
    {
        this.ProfileVersions = new List<ProfileVersion>();
        this.ServerInfoes = new List<ServerInfo>();
    }

    public int Id { get; set; }
    public string Number { get; set; }
    public string Tag { get; set; }
    public string Owner { get; set; }
    public string Approver { get; set; }
    public string Description { get; set; }
    public virtual ICollection<ProfileVersion> ProfileVersions { get; set; }
    public virtual ICollection<ServerInfo> ServerInfoes { get; set; }
}

**Profile Version Class**

public partial class ProfileVersion
{
    public ProfileVersion()
    {
        this.PlatformConfigurations = new List<PlatformConfiguration>();
    }

    public int Id { get; set; }
    public int ProfileId { get; set; }
    public int EnvironmentId { get; set; }
    public int VersionId { get; set; }
    public Nullable<bool> Locked { get; set; }
    public string LockedBy { get; set; }
    public string Comments { get; set; }
    public Nullable<int> Active { get; set; }
    public virtual Environment Environment { get; set; }
    public virtual ICollection<PlatformConfiguration> PlatformConfigurations { get;  
                                                                             set; }
    public virtual PlatformProfile PlatformProfile { get; set; }
    public virtual Version Version { get; set; }
}

**ServerInfo** 
public partial class ServerInfo
{
    public ServerInfo()
    {
        this.PlatformConfigurations = new List<PlatformConfiguration>();
    }

    public int Id { get; set; }
    public string ServerName { get; set; }
    public int ProfileId { get; set; }
    public int VersionId { get; set; }
    public int EnvironmentId { get; set; }
    public string ServerType { get; set; }
    public Nullable<short> Active { get; set; }
    public string Domain { get; set; }
    public string Location { get; set; }
    public string IP { get; set; }
    public string Subnet { get; set; }
    public string Gateway { get; set; }
    public Nullable<int> VLan { get; set; }
    public string DNS { get; set; }
    public string OS { get; set; }
    public string OSVersion { get; set; }
    public string Func { get; set; }
    public Nullable<short> IISInstalled { get; set; }
    public string ADDomainController { get; set; }
    public string ADOrganizationalUnit { get; set; }
    public string ADGroups { get; set; }
    public string LastError { get; set; }
    public Nullable<System.DateTime> LastUpdate { get; set; }
    public virtual Environment Environment { get; set; }
    public virtual ICollection<PlatformConfiguration> PlatformConfigurations { get;      
                                                                             set; }
    public virtual PlatformProfile PlatformProfile { get; set; }
    public virtual Version Version { get; set; }
    public virtual VMConfiguration VMConfiguration { get; set; }
}

 **Controller Code-**

 public ViewResult Index(string id )
    {

        var profileVerList = from ver in _context.Versions
                                where !(from pfv in _context.ProfileVersions
                                    select pfv.VersionId).Contains(ver.Id)
                                select ver;

        var bigView = new BigViewModel
        {
            VersionModel = profileVerList.ToList(),                
        };

        return View(model: bigView);
    }


**In the View where the exception is thrown**

 @Html.DropDownList(
            "SelectedVersionID", 
            new SelectList(
                Model.VersionModel.Select(x => new { Value = x.Id, Text = x.Number}),
                "Value",
                "Text"
                )
            )