Getting Error while using MEF

Question

0.00/5 (No votes)

See more:

I am getting below Error while using MEF as a part of my project.

What Could be the issue?

The composition remains unchanged. The changes were rejected because of the following error(s):
The composition produced a single composition error. The root cause is provided below. Review the CompositionException.Errors property for more detailed information.

1) No exports were found that match the constraint:
ContractName SimpleCalculator3.ICalculator
RequiredTypeIdentity SimpleCalculator3.ICalculator

Resulting in: Cannot set import 'SimpleCalculator3.Program.calculator (ContractName="SimpleCalculator3.ICalculator")' on part 'SimpleCalculator3.Program'.
Element: SimpleCalculator3.Program.calculator (ContractName="SimpleCalculator3.ICalculator") --> SimpleCalculator3.Program

Posted 28-Mar-14 0:38am

ashok rathod

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

ashok rathod · Accepted Answer · 2014-03-28T01:29:00

The Problem was that i had many parts which needs to be included in container and for that I have to use ImportMany instead of Import

XML

[ImportMany]
        IEnumerable<Lazy<IOperation, IOperationData>> operations;

instead of

XML

[Import]
        IEnumerable<Lazy<IOperation, IOperationData>> operations;