Web Application Architecture Performance In Single And Many Assemblies One For Each Tier

Aug 2, 2010

I'm building a new n-tier web application and I would like to know the performance differences between developing my tiers in one single assembly (each tier with its own namespace) or into different assemblies, one for each tier.

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Edit: I would like to keep the infrastructure as is, so while the framework ideas are appreciated, please keep your suggestions centered on the context I have provided.

Background

I'm building a web-based application that dynamically loads plugins. Each plugin comes with a manifest file that contains its dll location, namespace, and type.

Right now I'm using System.Reflection.Assembly.LoadFile to load up the dlls based off the locations provided in the manifest files. Then I load the types and so on.

As an Aside:
I may wind up changing to System.Reflection.Assembly.LoadFrom since I'll eventually be loading files from outside the bin directory. But if their is a better way (Assembly.Load or something), feel free to add that in as well

Problem

The problem is that Multiple plugins can potentially run off the same dll. So I wind up executing System.Reflection.Assembly.LoadFile("Identical.dll") multiple times.

I have the idea to check if my assembly has already been loaded by iterating through AppDomain.CurrentDomain.GetAssemblies(), but I don't know if that will help with performance (or if it will work period, I haven't tried it).

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Don't ever re-load the same assembly twice. Performance is key.

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[URL] but i have some doubts.

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[Code]....

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Presentation Layer Business Logic Layer Data Access Layer


-------------------------- --------------------------- -------------------------------

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