InvalidOperationException When calling ResourceManager.GetString

Question

My application throw the exception occasionally:

Exception type: InvalidOperationException Exception message: Collection was modified; enumeration

Answer 1

After a long time checking, I found the root cause. And here's my code cause above issue:

AppDomain.CurrentDomain.GetAssemblies().

Because this method try to load generated assemblies such as "web_adg_gfgt_dfd.dll" and they can be removed when IIS recycle .So to fix it we only need to avoid loading "generated assemblies".

Therefore we have 2 way for fixing:

1.Filter "generated assemblies":

AppDomain.CurrentDomain.GetAssemblies().Where(i => i.IsDynamic == false).ToList()

2.Using this method :

BuildManager.GetReferencedAssemblies().Cast<Assembly>().ToList()

Answer 2

Actually InvalidOperationException Exception message: Collection was modified; enumeration operation may not execute means:

We are changing the elements in the collection while looping over it with foreach.

I think this should solve your problem.

foreach (var func in list.ToList())
{
//Do your stuff
}