CMPE 137 Midterm

Two components: Common Language Runtime (CLR) and an extensive set of Framework Class Libraries (FCL).

Common Language Runtime is a common programming model and a standard type system for cross-platform, multi-language development.

1) Multi-language - supports VB, C#, C++, J#, etc.2) Cross-platform - application can run on any supported platform such as Win64, Win32 and WinCE3) based on the CLR, FCL, and JIT technology

1) apps are written against Framework Class Library (FCL), not underlying OS2) compilers generate generic assembly language which must be executed by the Common Language Runtime (CLR)

It has 1000's of predefined classes, common subset across all platforms and languages, networking, database access, GUI, web, etc.

To present an abstract, portable view of the underlying operating system

Common Language Runtime must be present to execute codeCLR must be able to locate all assemblies

1) Clients need CLR & FCL to run .NET apps2) Design trade-off - managed execution (memory protection, verifiable code, etc.), portability and possibly slower execution.

A component-based app contains: .EXE + 1 or more .DLLs

Team programming, multi-language development, code re-use (like across different .EXE's), and independent updating (just update a component). Note: FCL ships as a set of components.

.NET packages components into assemblies1 assembly = 1 or more compiled classes.EXE represents an assembly with classes + Main program.DLL represents an assembly with classes

DLLs must reside in same directory as EXEFCL assemblies reside in GACCLR looks in GAC first, then EXE's directory

Global Assembly Cache

Huge, powerful, and essentially a portable OS.

Two types: WinForms and WebForms.