why does entity framework+mysql provider enumeration returns partial results with no exceptions
- by Freddy Rios
I'm trying to make sense of a situation I have using entity framework on .net 3.5 sp1 + MySQL 6.1.2.0 as the provider. It involves the following code:
Response.Write("Products: " + plist.Count() + "<br />");
var total = 0;
foreach (var p in plist)
{
//... some actions
total++;
//... other actions
}
Response.Write("Total Products Checked: " + total + "<br />");
Basically the total products is varying on each run, and it isn't matching the full total in plist. Its varies widely, from ~ 1/5th to half.
There isn't any control flow code inside the foreach i.e. no break, continue, try/catch, conditions around total++, anything that could affect the count. As confirmation, there are other totals captured inside the loop related to the actions, and those match the lower and higher total runs.
I don't find any reason to the above, other than something in entity framework or the mysql provider that causes it to end the foreach when retrieving an item.
The body of the foreach can have some good variation in time, as the actions involve file & network access, my best shot at the time is that when the .net code takes beyond certain threshold there is some type of timeout in the underlying framework/provider and instead of causing an exception it is silently reporting no more items for enumeration.
Can anyone give some light in the above scenario and/or confirm if the entity framework/mysql provider has the above behavior?
Update: I can't reproduce the behavior by using Thread.Sleep in a simple foreach in a test project, not sure where else to look for this weird behavior :(.
