C# - Loading DLL Dynamic - System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types

Question

In C#, while loading DLL from folder using the below code getting these below stack trace, when tried to get the types.

var assembly = Assembly.LoadFile(assemblyInfo.FullName); // assembly loads perfectly using the absolute path.
var types = assembly.GetTypes(); // this line throws the below stacktrace.

Stack trace:

System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
   at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
   at System.Reflection.Assembly.GetTypes()

I also have checked existing solutions: Error message 'Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.', Loading DLLs at runtime in C# (didn't work)

Md. Alim Ul Karim · Accepted Answer · 2022-06-02 13:10:54Z

5

Solution to the problem was quite easy. It is just using a different method from the assembly. Instead of using LoadFile, we should use LoadFrom

So the below code solves the problem efficiently

var assembly = Assembly.LoadFrom(assemblyInfo.FullName); // loads perfectly, absolute path to dll
var types = assembly.GetTypes(); // loads perfectly.

There is no need to use GetExportedTypes. We can get all the types.

LoadFrom does auto reflection binding with other DLLs, however, loadfile doesn't do the same.

Which resolves that export issue.

edited Jun 2, 2022 at 13:10

answered Apr 24, 2019 at 10:20

Md. Alim Ul Karim

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3 Comments

user3793935 Over a year ago

Woah, I'm glad I found this, thank you very much good Sir!

Zoli Over a year ago

LoadFile and LoadFrom are totally different functions. So your solution does not explain what was the issue, just a 'luck'

Md. Alim Ul Karim Over a year ago

@Zoli LoadFile loads the contents of the assembly, whereas, LoadFrom loads the file (with dependencies as well - if found in the same dir) or you can LoadFrom does the auto binding using reflection for you where LoadFile doesn't

AminRostami · Accepted Answer · 2019-04-24 10:41:09Z

3

Assembly.LoadFile only loads the contents of an assembly , But Assembly.LoadFrom loads an assembly file perfectly (and dependencies If there are).

answered Apr 24, 2019 at 10:41

AminRostami

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