我从获取网页信息在两页:实体框架被删除条目
第一页: - 内容C1创建和翻译创建c1.t1; - 内容c2创建并翻译c2.t1创建;
第二页: - 如果系统检测到C1已经存在,只是增加了c1.t2到适当的表; - 系统检测到c2已经存在,只是将c2.t2添加到适当的表中;
不知何故,在第二页上,系统overritting c1.t1与c1.t2,只有第二翻译可用的数据库。当debbugging时,发现它正在删除c1.t1在某些时候,但我不明白为什么。
这是我的真实的东西:
- EF 4.1
- 代码优先阿布罗奇
- 的DbContext
我有这样的POCO实体(最小):
RegionalContent : - 这就像一个关于a的转换和区域信息内容:
public class XBLRegionalContent
{
[Key, Column(Order = 0)]
public string ContentId { get; set; }
[ForeignKey("ContentId")]
public virtual XBLContent Content { get; set; }
[Key, Column(Order = 1)]
public string RegionId { get; set; }
[ForeignKey("RegionId")]
public virtual XBLRegion Region { get; set; }
public string Name { get; set; }
}
内容: - 每个GUID独特的内容:
public class XBLContent
{
#region [ Properties ]
/// <summary>
/// The GUID
/// </summary>
[Key]
[StringLength(36, ErrorMessage="Must have 36 characters")]
[Required(ErrorMessage="Must have a unique GUID")]
public string GUID { get; set; }
public string Type { get; set; }
public virtual ICollection<XBLRegionalContent> RegionalInfo { get; set; }
}
地区 - 非常简洁明了:
public class XBLRegion
{
[Key]
[StringLength(5, ErrorMessage="ID must have 5 characters")]
[Required]
[RegularExpression(@"[a-z]{2}-[A-Z]{2}", ErrorMessage = "ID must be in ISO 639 standard")]
public string ID { get; set; }
public string Country { get; set; }
public string Language { get; set; }
}
的DbContext类有什么不同,只是DbSets。
一个内容有很多翻译。一个翻译有一个相关的内容。翻译主键是content guid和region id的复合词。
我在Model中有一个类来填充数据库并创建一个View用来显示信息的本地列表。这样,我只能访问一次数据库进行保存,并且在保存时不需要检索信息。
这里只有关于这个类的重要信息:
public class XBLChart : IDisposable
{
XBLContentContext db = new XBLContentContext();
private string baseurl = "http://foo.bar/";
public string Locale { get; private set; }
public string HTML { get; private set; }
public string URL { get; set; }
public ContentType Type { get; private set; }
public List<XBLContent> Contents { get; set; }
public XBLChart(ContentType type, string sort, string locale)
{
Type = type;
if (sort == null)
sort = Enum.GetName(typeof(SortBy), SortBy.OfferStartDate);
if (locale != null && locale.Length == 5)
Locale = locale;
else
Locale = "en-US";
URL = baseurl + Locale + "/" + sort;
HTML = FeedUtils.RequestHTML(URL);
Contents = new List<XBLContent>();
PopulateList();
}
private void PopulateList()
{
MatchCollection itens = Regexes.ChartItems().Matches(HTML);
MatchCollection titulos = Regexes.ChartTitles().Matches(HTML);
int type = (int)Type;
int start = type * 12;
this.Title = HttpUtility.HtmlDecode(titulos[type].Groups["title"].Value);
if (titulos.Count < 8 && start > 1)
{
start = (type - 1) * 12;
type--;
}
XBLRegion region;
if (!db.XBLRegions.Any(x => x.ID == Locale))
{
region = new XBLRegion { ID = Locale };
db.XBLRegions.Add(region);
db.SaveChanges();
}
else
region = db.XBLRegions.SingleOrDefault(x => x.ID == Locale);
for (int i = start; i < (start + 2); i++)
{
string guid = itens[i].Groups["guid"].Value;
XBLContent c = new XBLContent(guid);
if (!db.XBLContents.Any(x => x.GUID == guid))
{
c.Type = Type.ToString();
c.PopularInfo(Locale);
db.XBLContents.Add(c);
}
else
c = db.XBLContents.Single(x => x.GUID == c.GUID);
XBLRegionalContent regionalcontent = new XBLRegionalContent(guid, Locale);
if (!db.XBLRegionalInfos.Any(x => x.ContentId == guid && x.RegionId == Locale))
{
if (c.HTML == null)
c.PopularInfo(Locale);
regionalcontent.Populate(c.HTML);
regionalcontent.Name = HttpUtility.HtmlDecode(itens[i].Groups["name"].Value);
db.XBLRegionalInfos.Add(regionalcontent);
}
else
regionalcontent = db.XBLRegionalInfos.Single(x => x.ContentId == guid && x.RegionId == Locale);
db.SaveChanges();
c.RegionalInfo.Clear();
regionalcontent.Region = region;
c.RegionalInfo.Add(regionalcontent);
Contents.Add(c);
}
}
}