public void UpdateEntities <EntityType>(ObjectContext objCtx, string entitySetName, List <EntityType> newEntities) where EntityType : class
{
foreach (EntityType entity in newEntities)
{
objCtx.AttachTo(entitySetName, entity);
objCtx.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified);
}
objCtx.SaveChanges();
}
public void Attach <TEntity>(TEntity entity) where TEntity : class
{
if (entity == null)
{
throw new ArgumentNullException("entity");
}
ObjectContext.AttachTo(GetEntityName <TEntity>(), entity);
}
/// <summary>
/// </summary>
public void Sync()
{
var entries = GetEntries(EntityState.Added | EntityState.Modified | EntityState.Unchanged).Where(entry => entry.TargetState == EntityState.Detached);
// attach those target entity that are marked as detached
foreach (var entry in entries)
_context.AttachTo(entry.TargetEntityKey.EntitySetName, entry.TargetEntity);
}
/// <summary>
/// Attaches an unattached entity to an context
/// </summary>
/// <param name="entity"></param>
public void Attach(TEntity entity)
{
ObjectStateEntry entry = GetObjectStateEntry(entity);
if (entry == null || entry.State == EntityState.Detached)
{
context.AttachTo(EntitySetName, entity);
}
}
public override void UpdateUser(MembershipUser mUser)
{
try
{
IUser user = (IUser)mUser;
ObjectContext ctx = GetCtx() as ObjectContext;
ctx.AttachTo("UserSet", user);
ctx.ObjectStateManager.GetObjectStateEntry(user).SetModified();
ctx.SaveChanges();
}
catch (Exception ex)
{
throw new ProviderException("Failed to update user", ex);
}
}
private static void InternalAttach(ObjectContext ctx, object entity, bool addToContext, string entitySetName, List <object> analyzedEntities)
{
var objectType = ObjectContext.GetObjectType(entity.GetType());
var associations = ctx.MetadataWorkspace.GetItems <AssociationType>(DataSpace.OSpace);
var os = ctx.MetadataWorkspace.GetItem <EntityType>(objectType.FullName, DataSpace.OSpace);
var item = (EntityType)ctx.MetadataWorkspace.GetEdmSpaceType(os);
var value = ((XElement)(item.KeyMembers[0].MetadataProperties.First(p => p.Name == "http://EF:InsertWhen").Value)).Value;
var idType = ((PrimitiveType)item.Members[item.KeyMembers[0].Name].TypeUsage.EdmType).ClrEquivalentType;
var id = entity.GetType().GetProperty(item.KeyMembers[0].Name).GetValue(entity, null);
if (id.Equals(Convert.ChangeType(value, idType)))
{
if (addToContext)
{
ctx.AddObject(entitySetName, entity);
}
foreach (var association in ctx.MetadataWorkspace.GetItems <AssociationType>(DataSpace.CSpace).Where(a => a.AssociationEndMembers[1].Name == objectType.Name))
{
var propName = association.ReferentialConstraints[0].ToProperties[0].Name;
var foreignKey = entity.GetType().GetProperty(propName).GetValue(entity, null);
var principalEntity = association.AssociationEndMembers[0].GetEntityType();
var principalIdInsertValue = ((XElement)(principalEntity.KeyMembers[0].MetadataProperties.First(p => p.Name == "http://EF:InsertWhen").Value)).Value;
var principalIdType = ((PrimitiveType)principalEntity.Members[principalEntity.KeyMembers[0].Name].TypeUsage.EdmType).ClrEquivalentType;
var navPropName = item.NavigationProperties.First(p => p.RelationshipType.FullName == association.FullName).Name;
var navObject = entity.GetType().GetProperty(navPropName).GetValue(entity, null);
if (!foreignKey.Equals(Convert.ChangeType(principalIdInsertValue, idType)))
{
ctx.ObjectStateManager.GetObjectStateEntry(navObject).ChangeState(EntityState.Unchanged);
}
}
}
else
if (addToContext)
{
ctx.AttachTo(entitySetName, entity);
}
}
private ObjectStateEntry AttachObjectStateEntry(EFEntityInfo entityInfo)
{
ObjectContext.AttachTo(entityInfo.EntitySetName, entityInfo.Entity);
// Attach has lots of side effect - add has far fewer.
return(GetObjectStateEntry(entityInfo));
}
/// <summary>
/// 保存指定的实体变动
/// </summary>
/// <param name="entity">实体列表</param>
/// <returns></returns>
public int Save(TEntity entity)
{
_objectContext.AttachTo(EntitySetName, entity);
_objectContext.SetAllModified(entity);
return(_objectContext.SaveChanges());
}