使用MEF时出错 [英] Getting Error while using MEF

问题描述

我在使用MEF作为项目的一部分时遇到错误。



可能是什么问题？







构图保持不变。由于以下错误，更改被拒绝：

组合产生单个组合错误。根本原因如下。查看CompositionException.Errors属性以获取更多详细信息。



1）未找到符合约束条件的导出：

ContractName SimpleCalculator3.ICalculator

RequiredTypeIdentity SimpleCalculator3.ICalculator



导致：无法设置导入'SimpleCalculator3.Program.calculator（ContractName =SimpleCalculator3.ICalculator）'部分'SimpleCalculator3.Program'。

元素：SimpleCalculator3.Program.calculator（ContractName =SimpleCalculator3.ICalculator） - > SimpleCalculator3.Program

解决方案

问题是我有很多部件需要包含在容器中，为此我必须使用ImportMany而不是Import

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

而不是

 [导入] 
 IEnumerable <   Lazy< IOperation，    IOperationData  > >操作; 

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

解决方案

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

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

instead of

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

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