c# - An assignment generates a System.NullReferenceException -

iobjectvmfactory objectvmfactory = this.container.resolve<iobjectvmfactory>(); 

this throws nullreferenceexception.

if not assign result of this.container.resolve variable, not throw:

this.container.resolve<iobjectvmfactory>().anymethod(...) 

this has no sense me ... can give me explanation?

extra information:

this.container not null sure. triple checked. , if null second line fail.

the class implementing iobjectvmfactory has no defined constructor exception not happening inside iobjectvmfactory implementation.

the exception has no inner exceptions , points directly first line.

executing line directly on inmediate window generates ('' null) message.

thanks!

my project's configuration in release, not debug. in release mode, throws exception @ assignment. in debug, throws on step after assignment:

foo member { get; } public bar(foo foo) {     // crashes here on release     member = foo;       // crashes here in debug (foo.collection null)     foreach (var thing in foo.collection)          thing.dosomething(); } 

so looks having project's configuration in release may cause error. try switching configuration debug , find it's failing.

go build -> configuration manager

select project

change configuration release debug.

build , see if error occurs @ same place.