Conference我对这张桌子有问题。错误是：
列名“Conference_ConferenceID”无效
namespace MeetingBoard.Model
{
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Web.Script.Serialization;
using MeetingBoard.Model.Helpers;
using System.ComponentModel.DataAnnotations.Schema;
/// <summary>
/// A model of the Conference entity. Contains functionality to serialize the entity to JSON as well.
/// </summary>
public class Conference
{
[Key]
public int ConferenceID { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public int CreatorID { get; set; }
public string Location { get; set; }
public DateTime SubmissionDate { get; set; }
[ForeignKey("CreatorID")]
public virtual User Creator { get; set; }
public int[] RelatedProjectsIDs { get; set; }
public virtual ICollection<ProjectTag> RelatedProjectTags { get; set; }
public DateTime CreatedOn
{
get { return (this.dateCreated == default(DateTime)) ? DateTime.UtcNow : this.dateCreated; }
set { this.dateCreated = value; }
}
private DateTime dateCreated = default(DateTime);
public virtual ICollection<Group> RelatedGroups { get; set; }
public Conference()
{
RelatedGroups = new List<Group>();
}
/// <summary>
/// Generates an object that can be serialized by the JSON serializer of MVC
/// </summary>
/// <param name="happening">An Conference.</param>
/// <returns></returns>
public static Object ToJsonObject(Conference conference)
{
int[] project_ids = conference.RelatedProjectTags.Select<ProjectTag, int>(pt => pt.ProjectID).ToArray();
return new Conference_JSON
{
id = conference.ConferenceID,
title = conference.Title,
Content = conference.Content,
created_timestamp_UTC = Util.DateTimeToMilliTimeStamp(conference.CreatedOn),
SubmissionDate = conference.SubmissionDate,
Location = conference.Location,
creator_avatar = conference.Creator.Avatar,
creator_fullname = conference.Creator.Name,
creator_id = conference.Creator.UserID,
project_ids = project_ids,
};
}
/// <summary>
/// Instantiates a new Conference object based on the json data.
/// </summary>
/// <param name="json_data">The json data needs to have the structure as specified in the private Conference_JSON object.</param>
/// <returns>A new Conference object. The related projects are referenced using an integer array containing project ids.</returns>
public static Conference FromJson(String json_data)
{
JavaScriptSerializer serializer = new JavaScriptSerializer();
Conference_JSON conference_object = serializer.Deserialize<Conference_JSON>(json_data);
return FromJsonObject(conference_object);
}
/// <summary>
/// Instantiates a new Conference object based on the private Conference_JSON object.
/// </summary>
/// <param name="json_data">The object needs to be an instance of the private Conference_JSON object.</param>
/// <returns>A new Conference object. The related projects are referenced using an integer array containing project ids.</returns>
public static Conference FromJsonObject(Object conference_object)
{
Conference_JSON conference_json = (Conference_JSON)conference_object;
Conference conference = new Conference
{
ConferenceID = conference_json.id,
Title = conference_json.title,
Content = conference_json.Content,
RelatedProjectsIDs = conference_json.project_ids,
Location = conference_json.Location,
SubmissionDate = conference_json.SubmissionDate,
};
return conference;
}
/// <summary>
/// Defines the structure of the json objects that ar communicated to and from the Frontend.
/// </summary>
private class Conference_JSON
{
/// <summary>
/// The Conference identifier.
/// </summary>
public int id;
public string title;
public string Content;
/// <summary>
/// An numeric representation of the time, in milliseconds from Unix Epoch, UTC timezone.
/// </summary>
public double created_timestamp_UTC;
public string creator_fullname;
public int creator_id;
public string creator_avatar;
/// <summary>
/// Related projects.
/// </summary>
public int[] project_ids;
public string Location;
public DateTime SubmissionDate;
}
}
}