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Castle vs PostSharp: What are the differences?

### Introduction
Key differences between Castle and PostSharp in the context of .NET development are:

1. **Architecture and Scope**: Castle offers a complete set of tools and libraries for various aspects of .NET development including IoC containers, dynamic proxies, and aspect-oriented programming. On the other hand, PostSharp specifically focuses on aspect-oriented programming with its powerful and comprehensive set of AOP features.

2. **Ease of Use**: Castle tends to be more flexible and configurable as it allows developers to choose only the components they need for their projects. In contrast, PostSharp offers a more out-of-the-box solution with built-in aspects that are easier to set up and use without having to configure multiple components separately.

3. **Performance Impact**: Castle dynamic proxies are known to have a higher performance overhead compared to PostSharp's aspect weaving approach. PostSharp statically weaves aspects into the code during build time, leading to less runtime overhead and better performance in some scenarios.

4. **Community Support and Adoption**: Castle has been around for a longer time and has a strong community backing with a wide range of contributors and users. PostSharp, although newer, has gained popularity for its focus on AOP and simplicity in implementing cross-cutting concerns in .NET applications.

5. **Licensing Model**: Castle is an open-source project under the Apache License 2.0, allowing developers to use and modify the code without any licensing fees. In contrast, PostSharp offers both free and commercial licenses, providing additional support and advanced features for paid users.

6. **Integration with Visual Studio**: PostSharp provides seamless integration with Visual Studio through its extension, making it easier for developers to configure and apply aspects directly within the IDE. Castle, while still usable within Visual Studio, may require more manual setup and configuration compared to PostSharp's integrated experience.

In Summary, the key differences between Castle and PostSharp in .NET development lie in their architecture, ease of use, performance impact, community support, licensing model, and integration with Visual Studio.
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What is Castle?

Castle looks for suspicious login patterns without bothering the legitimate user nor the site administrator. The fully-automated anti-hijack engine identifies potential account compromises based on where the user logs in from and how they navigate the site.

What is PostSharp?

It adds design patterns and thread safety to C# and VB so you can avoid boilerplate and focus on business value.

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What tools integrate with Castle?
What tools integrate with PostSharp?
What are some alternatives to Castle and PostSharp?
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