具有相同密钥的对象已存在ObjectStateManager

Question

我有一个拥有另一个实体的虚拟集合的实体。当我尝试通过为新插入的对象填充虚拟集合来插入数据时，它正在抛出具有相同密钥的对象的错误。

我知道，当未创建实体时，它将具有0个值的标识字段。但是当我将数据存储在主表中时，我需要存储数据集合。

public virtual void Insert(TEntity entity)
    {
        ((IObjectState)entity).ObjectState = ObjectState.Added;
        entityDbSet.Attach(entity);
        dataContext.SyncObjectState(entity);
    }

.

这是我正在使用的插入方法。以下是POCO类（用于扩展类以保存数据集合的部分实现）。

public partial class UserDefinedData
{
    public int ID { get { return this.UserSelectedDValueID; } set { this.UserSelectedDValueID = value; } }
    public string Name { get { return this.entityTypeName; } }

    public virtual AM_AssetLocations AM_AssetLocations { get; set; }
}

public partial class AM_AssetLocations
{
    // Reverse navigation
    public virtual ICollection<UserDefinedData> UserDefinedDatas { get; set; }               
}

.

我正在使用json传递数据。这也似乎是正确的。由于数据的虚拟集合正确地添加到实体中。

{"entity":{"ID":"0","CreatedByID":"0","CreatedDate":"04-13-2014 10:48","ModifiedByID":"","ModifiedDate":"","DeletedByID":"","DeletedDate":"","Deleted":"false","Name":"h","Active":"true","DisplayOrder":"0","Test Decimal":"10","":"","Test Number":"10","Test Plain Text":"h","Test RTF":"<p>hsj</p>","Test Yes No":"false","Test Yes No 2":"true","TestDate":"01-Apr-2014","TestDateTime":"10:00 AM","UserDefinedDatas":[{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"123","ValueNumber":"10"},{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"124","ValueListItemID":"25"},{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"122","ValueNumber":"10"},{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"117","ValueString":"h"},{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"119","ValueString":"<p>hsj</p>"},{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"125","ValueYesNo":0},{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"126","ValueYesNo":1},{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"120","ValueDate":"01-Apr-2014"},{"EntityType":"AM_AssetLocations","EntityTypeID":"0","CreatedByID":"0","UserDefinedFieldID":"121","ValueDate":"08-Apr-2014 10:00 AM"}]}}

.

请帮我解决这个问题。

注意：只要尝试分配我的身份字段，就可以解决相同的密钥异常我正在投掷引用完整性异常。我知道储存现实收集应该正常工作。但它不适合我。请给我一些指导和解决方案。

谢谢， Sachin

Answer 1

Attach用于附加现有实体。

[p>上下文应分配适当的状态本身，无需在案例中手动执行它

public virtual void Insert(TEntity entity)
{
    //((IObjectState)entity).ObjectState = ObjectState.Added;
    context.TEntityDbSet.Add(entity);//Add, not Attach!
    //dataContext.SyncObjectState(entity);
    context.SaveChanges()
}

.

.. http://msdn.microsoft.com/en-us/data/jj592676.aspx

Answer 2

嗨，谢谢一切寻求帮助。我改变了执行此操作的方法。我已经创建了存储过程，它接受可以通过.NET页面传递为DataSet的子集合的主实体和用户定义的表类型。这对我来说很好。

谢谢。