保存更改失败后，删除实体框架中的待处理插入

Question

I am doing a batch insert of about 50 or so records. It adds all the records and trys to save them all at once.

foreach(var item in MyItemsToSave)
{
   context.MyItems.Add(item);
}
context.SaveChantes();

If this fails I want to add them one by one. I have some other logic to handle failures but I don't want to lose 49 valid records because one failed. I tried the following code:

foreach(var item in MyItemsToSave)
{
    context.MyItems.Add(item);
    try{
        context.SaveChanges();
    }
    catch(Exception e)
    {
      .......do something
    }
}

These two pieces of code both run in the same process. The first section runs as best case scenario and then the second runs if the first portion of code fails. What I determined is that the items in the batch portion of the code is still waiting to be inserted. So when I call the savechanges method it is still trying to save the bad record.

How can I remove the records that failed (or all of them and start over)?

EDIT NOTE: Even with the second go around it will still fail because as soon as bad record gets in to the list it will try to insert it when your try the next iteration of the loop.

Answer 1

Better you save the changes one by one.

foreach(var item in MyItemsToSave)
{

    try{
        context.MyItems.Add(item);
        context.SaveChanges();
    }
    catch(Exception e)
    {
       while (item.<FKColl>.Count > 0)
       {
           context.Detach(item.<FKColl>.First());
       }
      context.Detach(item);
    }
}

If any failed, Use Detach to remove the item from context(NOT IN DATASOURCE). Also you should remove the fk items before detaching the item