Introduction to MEF (managed extensibility Framework)

1. What is MEF?

MEF is a new framework from Microsoft's collaborative construction of extended applications. It aims to add plug-ins to running applications. MEF inherits from the. Net 4.0 Framework Platform and exists in system programs of various application platforms.

2. Assembly

System. componentmodel. Composition. dll

3. Key Structure

Import

Export

Compose

4. Related Knowledge

Part: an object that can be imported or exported to applications

Catalog: an object that helps you find valid building parts in an assembly or folder.

Contract: The Import and Export parts must be communicated through the contract.

Import attribte: defines the needs of a part. It applies a single export attriute

Importmany attribute: similar to the import attribute, but supports multiple export attriutes

Export attribute: You need to create and export when creating the import. It serves as a participant in the build plug-in.

Compose: integrate exported with import

5. In a simple example, only a single export part is used in the current Assembly.

6. In a simple example, multiple export parts are used in the current Assembly.

7. In a simple example, multiple export parts are used in the integration directory and folder directory.

Description: Code 5, 6, and 7: mefdemo.rar