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Hash Function Added To The PredicateEqualityComparer

Sometime ago I wrote a predicate equality comparer to be used with LINQ ’s Distinct operator. The Distinct operator uses an instance of an internal Set class to maintain the collection of distinct elements in the source collection which in turn checks the hash code of each element (by calling the GetHashCode...

Posted to Paulo Morgado by Paulo Morgado on Wed, Jun 13 2012
Filed under: Filed under: .NET, LINQ, CodePlex, .NET4.0, CodeProject
Creating Property Set Expression Trees In A Developer Friendly Way

In a previous post I showed how to create expression trees to set properties on an object. The way I did it was not very developer friendly. It involved explicitly creating the necessary expressions because the compiler won’t generate expression trees with property or field set expressions. Recently...

Posted to Paulo Morgado by Paulo Morgado on Tue, Jan 11 2011
Filed under: Filed under: .NET, C#, LINQ, .NET4.0, CodeProject, C#4.0, ExpressionTrees
LINQ: Implementing The SkipLastWhile Operator

Following my last posts ( > )( > ), in this post I’ll introduce the implementation of the SkipLastWhile operator. The SkipLastWhile returns all but the last contiguous elements from a a sequence that satisfy the specified criteria and is implemented as the SkipLastWhile extension methods : public...

Posted to Paulo Morgado by Paulo Morgado on Tue, Oct 19 2010
Filed under: Filed under: .NET, C#, LINQ, CodePlex, .NET4.0, CodeProject, C#4.0, C#3.0
LINQ: Implementing The SkipLast Operator

Following my last post , in this post I’ll introduce the implementation of the SkipLast operator. The SkipLast operator returns all but a specified number of contiguous elements from the end of a sequence and is implemented as the SkipLast extension method : public static IEnumerable <TSource>...

Posted to Paulo Morgado by Paulo Morgado on Tue, Oct 19 2010
Filed under: Filed under: .NET, C#, LINQ, CodePlex, .NET4.0, CodeProject, C#4.0, C#3.0
LINQ: Introducing The Skip Last Operators

After having introduced the TakeLast operators ( > )( > )( > ), it makes sense to introduce their duals: the SkipLast operators. Name Description Example SkipLast<TSource>(IEnumerable<TSource>) Returns all but a specified number of contiguous elements from the end of a sequence....

Posted to Paulo Morgado by Paulo Morgado on Tue, Oct 19 2010
Filed under: Filed under: .NET, C#, LINQ, CodePlex, .NET4.0, CodeProject, C#4.0, C#3.0
LINQ: Implementing The TakeLastWhile Operator

Following my last posts ( > )( > ), in this post I’ll introduce the implementation of the TakeLastWhile operator. The TakeLastWhile operator returns last contiguous elements from a sequence that satisfy the specified criteria and is implemented as the TakeLastWhile extension methods : public static...

Posted to Paulo Morgado by Paulo Morgado on Sun, Oct 17 2010
Filed under: Filed under: .NET, C#, LINQ, CodePlex, .NET4.0, CodeProject, C#4.0, C#3.0
LINQ: Implementing The TakeLast Operator

Following my last post , in this post I’ll introduce the implementation of the TakeLast operator. The TakeLast operator returns a specified number of contiguous elements from the end of a sequence and is implemented as the TakeLast extension method : public static IEnumerable <TSource> TakeLast<TSource>...

Posted to Paulo Morgado by Paulo Morgado on Sun, Oct 17 2010
Filed under: Filed under: .NET, C#, LINQ, CodePlex, .NET4.0, CodeProject, C#4.0, C#3.0
LINQ: Introducing The Take Last Operators

Some time ago I needed to retrieve the last items of a sequence that satisfied some criteria and, looking at the operators available in the Enumerable class, I noticed that there wasn’t such operator. The only way to achieve this was to reverse the sequence, take the items that satisfied the criteria...

Posted to Paulo Morgado by Paulo Morgado on Sun, Oct 17 2010
Filed under: Filed under: .NET, LINQ, CodePlex, .NET4.0, CodeProject
PauloMorgado.Linq Project On CodePlex

I’ve created a project on CodePlex to share my LINQ utilities and operators: PauloMorgado.Linq In this project you can find the code from my previous posts about the Distinct operator: LINQ: Enhancing Distinct With The PredicateEqualityComparer LINQ: Enhancing Distinct With The SelectorEqualityComparer...

Posted to Paulo Morgado by Paulo Morgado on Sun, Oct 10 2010
Filed under: Filed under: .NET, LINQ, CodePlex, .NET4.0, CodeProject
Hydrating Objects With Expression Trees - Part III

To finalize this series on object hydration, I’ll show some performance comparisons between the different methods of hydrating objects. For the purpose of this exercise, I’ll use this class: class SomeType { public int Id { get ; set ; } public string Name { get ; set ; } public DateTimeOffset CreationTime...

Posted to Paulo Morgado by Paulo Morgado on Tue, Aug 17 2010
Filed under: Filed under: .NET, C#, MSDN, LINQ, .NET3.5, .NET4.0, CodeProject, C#4.0, ExpressionTrees, C#3.0
Hydrating Objects With Expression Trees - Part II

In my previous post I showed how to hydrate objects by creating instances and setting properties in those instances. But, if the intent is to hydrate the objects from data, why not having an expression that does just that? That’s what the member initialization expression is for. To create such an expression...

Posted to Paulo Morgado by Paulo Morgado on Mon, Aug 16 2010
Filed under: Filed under: .NET, C#, LINQ, .NET3.5, .NET4.0, CodeProject, C#4.0, ExpressionTrees, C#3.0
Hydrating Objects With Expression Trees - Part I

After my post about dumping objects using expression trees , I’ve been asked if the same could be done for hydrating objects. Sure it can, but it might not be that easy. What we are looking for is a way to set properties on objects of an unknown type. For that, we need to generate methods to set each...

Posted to Paulo Morgado by Paulo Morgado on Sun, Aug 15 2010
Filed under: Filed under: .NET, C#, LINQ, Reflector, .NET4.0, CodeProject, C#4.0, ExpressionTrees
Mastering Expression Trees With .NET Reflector

Following my last post , I received lots of enquiries about how got to master the creation of expression trees . The answer is: .NET Reflector On that post I needed to to generate an expression tree for this expression: Expression < Func < object , object >> expression = o => (( object...

Posted to Paulo Morgado by Paulo Morgado on Thu, Aug 5 2010
Filed under: Filed under: .NET, C#, LINQ, Reflector, .NET3.5, .NET4.0, CodeProject, C#4.0, ExpressionTrees, C#3.0
Dumping Objects Using Expression Trees

No. I’m not proposing to get rid of objects. A colleague of mine was asked if I knew a way to dump a list of objects of unknown type into a DataTable with better performance than the way he was using. The objects being dumped usually have over a dozen of properties, but, for the sake of this post...

Posted to Paulo Morgado by Paulo Morgado on Mon, Aug 2 2010
Filed under: Filed under: .NET, C#, LINQ, .NET3.5, .NET4.0, CodeProject, C#4.0, ExpressionTrees, C#3.0

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