Import VB.NET DLL into C#.Net Project

Question

I am trying to get a VB.NET DLL used as a reference on a aspx.cs page.

I have added the compiled DLL and it's resources to a bin folder, and I have added the reference and added

using my_DLL;

Then I go to call a function like this....

public string foobar = concat_function_DLL("foo" , "bar");

but, I get the red sqwiggles under concat_function_DLL (my DLL function) and this message :

"The name 'concat_function_DLL' does not exist in the current context

I have tried removing the bin folder, removing the reference, re-creating the bin folder and then re-adding the reference, but it still doesn't want to recognize anything from my DLL.

The DLL will work completely fine from my VB.Net webpage so I know it cannot be a problem with the DLL. Maybe there is some step I am missing? I thought I read that .NET DLLs are interchangeable between both vb.net and c#.net.

Thank you!

I should add that I can open my_DLL.xml and read it perfectly fine from the bin folder, so the DLL is there.... but if I click on my_DLL and try to 'peak deffinition' it says "Cannot navigate to definition" — Christopher
– Christopher, Commented Sep 28, 2015 at 17:58

vcsjones · Accepted Answer · 2015-09-28 18:07:20Z

3

public string foobar = concat_function_DLL("foo" , "bar");

You are calling a method, concat_function_DLL, but you aren't specifying the type that declares it.

C# won't automatically put "global" methods from VB.NET modules in scope. Use this:

public string foobar = YourModuleName.concat_function_DLL("foo" , "bar");

Or, if you are using C# 6 (Visual Studio 2015), then you can use the VB.NET module and use it as you were before. Add this using statement:

using static my_DLL.YourModuleName;

Then you can just use the method as you were previously.

edited Sep 28, 2015 at 18:07

answered Sep 28, 2015 at 18:01

vcsjones

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1 Comment

Christopher Over a year ago

Great! I am only on VS2013 but your first solution did it for me! I did not know that I had to go like this MyDLL.StringTools.concat_fuction_DLL("foo", "bar"); thanks so much!

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