Abstract Factories are a code smell

When it comes to writing LOB applications, abstract factories are a code smell as they increase the complexity of the consumer instead of reducing it. This article describes why and offers alternatives.

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- filed under .NET General, Architecture, C#, Dependency injection - seven comments / No trackbacks - §

Dependency Injection in Attributes: don’t do it!

A number of common frameworks have promoted the concept of using attributes as a way of implementing AOP. On the surface this seems perfectly acceptable but in reality the maintainability of these options degrades as you add behaviors by injecting dependencies into attributes. The point of this article is “don’t do it!” There are better ways and this article will describe one such alternative.

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- filed under .NET General, ASP.NET, C#, Dependency injection - 25 comments / No trackbacks - §

Dependency Injection anti-pattern: multiple constructors

When Dependency Injection is applied correctly and completely it is important that each type only has one constructor - multiple constructors are redundant, make your DI configuration fragile, and lead to maintainability issues.

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- filed under .NET General, Architecture, C#, Dependency injection - nine comments / No trackbacks - §

Writing Highly Maintainable WCF Services

When it comes to writing maintainable software, there is no alternative to the five core principles of object oriented design. When software is based on these principles, everything becomes significantly easier. When your software is based on these principles, writing a highly maintainable WCF web service on top of that can be done in just a matter of minutes.

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- filed under .NET General, Architecture, C#, Dependency injection - eleven comments / No trackbacks - §

Primitive Dependencies with Simple Injector

This article describes how to extend the Simple Injector with convension based configuration for primitive constructor arguments.

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Returning data from command handlers

This article extends the architectural design of command handlers to allow command handlers to return data.

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- filed under .NET General, Architecture, C#, Dependency injection, O/RM, Simple Injector - 22 comments / No trackbacks - §

Meanwhile... on the command side of my architecture

This article describes how a single interface can transform the design of your application to be much cleaner, and more flexible than you ever thought possible.

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Adding Covariance and Contravariance to Simple Injector

A few weeks back I read this question on Stackoverflow. The question was about applying covariance / contravariance (or variance for short) to the Autofac dependency injection container. The question triggered me to think about variance support in Simple Injector. I was wondering whether special changes were needed to the core framework to allow this. However, it didn't take me long to realize that enabling variance is actually pretty easy for anyone using the Simple Injector. The prerequisites are a proper application design and .NET 4.0.

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Faking your LINQ Provider part 2: Optimizing performance with fetching strategies

This sequel explains how to write O/RM specific performance optimizations in such a way that the core business logic won’t be affected. This article builds on top of the foundation described in part 1 and uses the Fetching Strategy design pattern to achieve this goal.

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- filed under .NET General, C#, Dependency injection, Entity Framework, LINQ, LINQ to SQL, O/RM, Simple Injector, SQL - No comments / No trackbacks - §

Simple Injector: Working with multiple constructors

Although limited in features, the Simple Injector has simple but flexible way to add features, such as the possibility to work with multiple constructors.

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- filed under .NET General, C#, Dependency injection, Simple Injector - two comments / No trackbacks - §

Simple Injector - The easiest Dependency Injection framework in town

The Simple Injector is an easy-to-use Inversion of Control library for .NET and Silverlight. It solely supports code-based configuration and is an ideal starting point for developers unfamiliar with larger IoC / DI libraries.

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- filed under .NET General, C#, Simple Injector, Simple Service Locator - one comment / No trackbacks - §

Faking your LINQ provider part 1

I recently tried to figure out how to write testable code while using LINQ to SQL as my O/RM of choice, without loosing the ability to use LINQ to Expression trees! In this post I describe the design I ender up with.

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- filed under .NET General, ADO.NET, C#, Databases, Dependency injection, Entity Framework, LINQ, LINQ to SQL, O/RM - fifteen comments / No trackbacks - §

Adding Enum Support to Entity Framework LINQ queries

Roger Alsing wrote an interesting post yesterday about adding support for enums to LINQ queries. It is nice to see what Roger is doing with the .NET 4.0 ExpressionVisitor to change Expression trees that allow this behavior. What I dislike however, is that for this solution you need to reimplement all Queryable extension methods. So I thought about this and found a more pleasant way of intercepting query calls.

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- filed under .NET General, C#, Databases, Entity Framework, LINQ, LINQ to SQL, O/RM, SQL - one comment / No trackbacks - §

Using IDataErrorInfo with Validation Application Block

The IDataErrorInfo interface is a core part of the .NET framework and both WPF and ASP.NET MVC use this interface for validation purposes. In this article I will show how to build an abstract base class that implements IDataErrorInfo in a way that Validation Application Block is used under the covers.

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- filed under .NET General, C#, Enterprise Library, Validation Application Block - four comments / No trackbacks - §

Dependency Injection in ASP.NET Web Forms with the Common Service Locator

This article describes how to create and configure a custom PageHandlerFactory class that enables automatic constructor injection for System.Web.UI.Page classes. This keeps your application design clean and allows you to keep the application’s dependency to the IoC library to a minimum.

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- filed under .NET General, C#, Dependency injection, Simple Service Locator - eight comments / No trackbacks - §

Mixing Validation Application Block With DataAnnotation: What About SelfValidation?

This article describes how to move the self validation methods of a type to its meta data type, using Validation Application Block 5.0. Using self validation methods inside Data Annotations' meta data type is something that is not supported out of the box.

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- filed under .NET General, C#, Enterprise Library, Validation Application Block - six comments / No trackbacks - §

Integrating Validation Application Block with ASP.NET part 2

This post describes how to take integration of Validation Application Block with ASP.NET Web Forms to the next level by introducing extension methods that centralize the creation of PropertyProxyValidator controls and enable compile time support. This post build on the code in the previous article and allows users to define value conversions.

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- filed under ASP.NET, C#, Enterprise Library, Validation Application Block - four comments / No trackbacks - §

Integrating Validation Application Block with ASP.NET part 1

This post describes how to take integration of Validation Application Block with ASP.NET Web Forms to the next level by introducing extension methods that centralize the creation of PropertyProxyValidator controls and enable compile time support.

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- filed under ASP.NET, C#, Enterprise Library, Validation Application Block - four comments / No trackbacks - §

CuttingEdge.Conditions source used for MongoDB .NET Driver

Since I built CuttingEdge.Conditions, I had lots of positive reactions from developers who loved it. However, I've never saw the source code been reused in another library or framework; until now.

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Validator inheritance while using Validation Application Block configuration files

This article describes how to build an IConfigurationSource implementation that allows validators, defined in a base class or interface, to be inherited by subclasses and implementations.

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- filed under .NET General, C#, Enterprise Library, Validation Application Block - two comments / No trackbacks - §

Splitting up Validation Application Block configuration into multiple files

This article describes how to build an IConfigurationSource implementation that allows reading multiple configuration files that each contain part of the total Enterprise Library Validation Application Block configuration.

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- filed under .NET General, C#, Enterprise Library, Validation Application Block - two comments / No trackbacks - §

Simple Service Locator - The easiest Inversion of Control framework in town

The Simple Service Locator is an easy-to-use Inversion of Control library that is a complete implementation of the Common Service Locator interface. It solely supports code-based configuration and is an ideal starting point for developers unfamiliar with larger IoC / DI libraries

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- filed under .NET General, C#, Dependency injection, Simple Service Locator - eight comments / No trackbacks - §

Sorting entities with the EntitySorter

This article describes the EntitySorter<T> class. It's a nifty little thing that allows the presentation layer to instruct the service layer how collections should be returned.

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- filed under .NET General, C#, Entity Framework, LINQ, LINQ to SQL - five comments / No trackbacks - §

Integrating Enterprise Library Validation Application Block With LINQ to SQL and Entity Framework Part 4: Using Metadata to Automate Validations

This article describes how to extract information from your generated LINQ to SQL entities to automate validations like maximum string length and disallowing null values.

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- filed under .NET General, C#, Enterprise Library, Entity Framework, LINQ, LINQ to SQL, O/RM, Validation Application Block - No comments / No trackbacks - §

Preventing Cross-site Request Forgery (CSRF) Attacks Using ViewState

This article describes what Cross-site request forgery attacks are and how to mitigate them.

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- filed under ASP.NET, C#, Security - No comments / No trackbacks - §

CuttingEdge.Conditions version 1.0 released

Last week I published the first stable release of CuttingEdge.Conditions.

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Removing Otherwise method from CuttingEdge.Conditions

In this post I’ll describe another breaking change I’m making to my open source project, CuttingEdge.Conditions.

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Controversial change in CuttingEdge.Conditions

In this post I’ll describe a controversial change I’m making in my open source project, CuttingEdge.Conditions.

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Free C# 3.0 Pocket Reference ebook

Just found this free ebook on the Red Gate site:

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- filed under Books, C# - No comments / No trackbacks - §

Choosing FxCop rules for Line Of Business applications

Dennis Doomen, architect at Aviva Solutions, published a set of C# 3.0 Coding Guidelines a few months ago. While a lot of different C# coding guidelines can be found on the web, this one caught my attention.

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