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由於我在處理ASP.NET MVC項目，所以我看到了一個奇怪的EF行爲，這會延遲我（確切地說，我仍然在這個問題上停留在最少一個月...只有現在我已經意識到我的DDD架構代碼沒有被破壞，並且它是特定的EF相關的代碼錯誤）。實體框架自動將新的實例實體分配爲已刪除
我的網站有帖子。每個帖子都有一個屬性集（PostAttributeValue），並且每個屬性值都有一個相關的PostAttributeDefinition其中包含有關它的數據 - 如標題，驗證規則，原始值（二進制序列化），數據類型等
這是我的帖子型號：
public class Post
{
#region Settings
/// <summary>
/// Maximum linked images
/// </summary>
public static int MaximumLinkedImages
{
get { return Properties.Settings.Default.MaximumPostsLinkedImages; }
}
/// <summary>
/// Maximum linked image size in MB
/// </summary>
public static int MaximumLinkedImageSize
{
get { return Properties.Settings.Default.MaximumPostLinkedImageSize; }
}
/// <summary>
/// Delay hours between posts bumping
/// </summary>
public static int BumpPostDelayHours
{
get { return Properties.Settings.Default.BumpPostDelayHours; }
}
#endregion
#region ctor
public Post()
{
this.Attributes = new List<PostAttributeValue>();
this.LinkedImages = new List<string>();
}
#endregion
/// <summary>
/// The parent category that this post was posted into
/// </summary>
[Required]
public virtual Category ParentCategory { get; set; }
/// <summary>
/// The post unique identifier
/// </summary>
[Key]
public Guid PostIdentifier { get; set; }
/// <summary>
/// The post title (e.g. "Great vila!")
/// </summary>
[Required]
public string Title { get; set; }
/// <summary>
/// The post title url alias (e.g. "great-vila")
/// </summary>
public string TitleUrlAlias { get; set; }
/// <summary>
/// Post extra notes and information written by the author
/// </summary>
[Required]
public string Description { get; set; }
/// <summary>
/// The post item city
/// </summary>
[Required]
public virtual City City { get; set; }
/// <summary>
/// The post item location
/// </summary>
public string Location { get; set; }
/// <summary>
/// Is the post was published and marketed by brokerage (Tivuuch)
/// </summary>
[Required]
public bool Brokerage { get; set; }
/// <summary>
/// Post custom attributes
/// </summary>
public virtual ICollection<PostAttributeValue> Attributes { get; set; }
/// <summary>
/// The post assigned price
/// </summary>
[Required]
public int RequestedPrice { get; set; }
/// <summary>
/// List of images linked with the post (includes only the name of the picture, a.k.a "foo.png", "bar.jpg" etc.)
/// </summary>
public virtual ICollection<string> LinkedImages { get; set; }
public string LinkedImagesSerialized
{
get
{
if (this.LinkedImages == null)
{
this.LinkedImages = new List<string>();
}
return string.Join(",", this.LinkedImages);
}
set
{
if (this.LinkedImages == null)
{
this.LinkedImages = new List<string>();
}
if (string.IsNullOrEmpty(value))
{
return;
}
this.LinkedImages = value.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries).ToList();
}
}
/// <summary>
/// Cached generated cached url using IShorterUrlService
/// </summary>
public string GeneratedShorterUrl { get; set; }
/// <summary>
/// Is this post marked as hot
/// </summary>
public bool IsHotPost { get; set; }
/// <summary>
/// The post publish status
/// </summary>
public PostPublishStatus PublishStatus { get; set; }
/// <summary>
/// The post author
/// </summary>
public virtual Account Author { get; set; }
/// <summary>
/// The author IP address (collected to determine different IPs)
/// </summary>
public string AuthorIPAddress { get; set; }
/// <summary>
/// The creation date of the post
/// </summary>
public DateTime CreationDate { get; set; }
/// <summary>
/// The last post modification date
/// </summary>
public DateTime LastUpdatedDate { get; set; }
/// <summary>
/// The date that the post was bumped at, used to sort the posts in category.
/// </summary>
public DateTime LastBumpDate { get; set; }
}
這是PostAttributeValue 公共類PostAttributeValue {/// /// 屬性的值id /// [關鍵] 公衆詮釋AttributeValueId {獲得;組; }
/// <summary>
/// The value owner post
/// </summary>
public virtual Post OwnerPost { get; set; }
/// <summary>
/// The value attribute definition id
/// </summary>
//public int RelatedAttributeDefinitionId { get; set; }
/// <summary>
/// The value attribute definition
/// </summary>
public virtual PostAttributeDefinition Definition { get; set; }
/// <summary>
/// The stored raw value
/// </summary>
public byte[] RawValue { get; set; }
}
，這是PostAttributeDefinition 公共類PostAttributeDefinition {/// /// 的過濾器名稱 /// [關鍵] 公衆詮釋DefinitionId {獲得;組; }
/// <summary>
/// The owner category
/// </summary>
[Required]
public virtual Category OwnerCategory { get; set; }
/// <summary>
/// The filter title
/// </summary>
[Required]
public string Title { get; set; }
/// <summary>
/// Metadata enum that provides extra data about the data type
/// </summary>
public PostAttributeTypeMetadata TypeMetadata { get; set; }
/// <summary>
/// Bitwise metadata that provides data about the object in display mode
/// </summary>
public PostAttributeDisplayModeMetadata DisplayModeMetadata { get; set; }
public PostAttributeEditorType EditorType { get; set; }
/// <summary>
/// The attribute raw default value
/// </summary>
[Required]
public byte[] RawDataValue { get; set; }
/// <summary>
/// The attribute raw associated validation attributes
/// </summary>
public byte[] RawValidationRules { get; set; }
/// <summary>
/// Is this field required
/// </summary>
public bool IsRequired { get; set; }
}
我的問題是，當我試圖添加一個新的文章中，我得到一個錯誤的關係（A relationship from the AssociationSet is in the 'Deleted' state） 這是
A relationship from the 'PostAttributeValue_Definition' AssociationSet is in the 'Deleted' state. Given multiplicity constraints, a corresponding 'PostAttributeValue_Definition_Source' must also in the 'Deleted' state.
現在，我已經看到，問題在於，當我爲PostAttributeValue分配一個定義時，它會自動變爲Deleted - 即使我正在分配一個我現在從DB中獲取的定義。
我測試上面的代碼：
var db = ServiceLocator.SharedInstance.GetInstance<MyDbContext>();
List<PostAttributeValue> v = new List<PostAttributeValue>();
var entity = db.PostAttributesDefinitions.Where(d => d.DefinitionId==1).Include(d => d.OwnerCategory).First();
v.Add(new PostAttributeValue() { Definition = entity });
Post post = new Post()
{
Title = "foo",
Description = "bar",
City = new City { },
Brokerage = false,
Location = "",
RequestedPrice = 500,
ParentCategory = new Category() { },
AuthorIPAddress = "",
Attributes = v
};
db.Posts.Add(post);
var deletedValuesStore = ((System.Data.Entity.Infrastructure.IObjectContextAdapter)db)
.ObjectContext.ObjectStateManager.GetObjectStateEntries（System.Data.EntityState.Deleted）;
並看到deletedValuesStore包含1項 - 定義。當我評論此行時，商店中沒有物品。
你有什麼想法如何解決？ 感謝您的時間！