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C#

Tip: Use the LINQ methods that take a predicate

Submitted by roger on Wed, 2010-02-03 09:33

Instead of this:

var author = (from a in dataContext.Authors where a.Id == authorId select a).Single();

...use this:

var author = dataContext.Authors.Single(a => a.Id == authorId);

Also consider whether you wanted SingleOrDefault.

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Using Expression<T> as a Compiler, to avoid writing conversion code

Submitted by roger on Thu, 2009-09-03 15:22

Marc Gravell wrote about using Expression<T> as a compiler. It was a bit of an eye-opener.

There's a bit in it where he says:

A similar approach [to using Expression for shallow cloning an object] might be used, for example, to map data between DTO entities and entity objects...

Say no more:

LINQ's ForEach doesn't work on IEnumerable<T>

Submitted by roger on Sun, 2009-03-29 09:39

For some reason, LINQ's ForEach extension method doesn't work on IEnumerable<T>; it only works on IList<T>. Easy fix:

public static class EnumerableExtensions
{
    public static void ForEach<T>(this IEnumerable<T> values, Action<T> action)
    {
        foreach (var value in values)
        {
            action(value);
        }
    }
}

2 comments

Adding an extra (optional) page to the C# Wizard

Submitted by roger on Wed, 2008-10-29 16:53

This seems to be causing a few problems, so I'll quickly walk through it. I'll try to throw some screenshots in later.

In the TestWizard project, choose "Add New Item". In the dialog, choose "Inherited User Control" (it's under Windows Forms). Call it OptionalPage.cs. The Inheritance Picker will appear. Choose "InternalWizardPage".

In the forms designer, click on the banner and change the Title and Subtitle properties to "Optional Page" and "This page is optional".

In the constructor for TestWizardSheet, add a line to add the OptionalPage:

Why is NUnit not in the GAC? (or Why does [assembly X] not appear in Visual Studio's Add Reference dialog?)

Submitted by roger on Sat, 2008-10-25 10:58

Because Visual Studio doesn’t look for references in the GAC:

This is by design.

Odd behaviour with WCF base addresses and HTTP.SYS wildcards

Submitted by roger on Thu, 2008-03-13 21:30

I'm at DevWeek this week, and I went (among other things) to a couple of WCF presentations by Aaron Skonnard.

So, anyway, last night I put together a really simple WCF service. It looks like this:

Generating the Fibonacci sequence by using the yield keyword, non-recursively

Submitted by roger on Sun, 2007-06-03 15:21

class FibonacciSequence : IEnumerable
{
    public IEnumerator GetEnumerator()
    {
        yield return (long)0;
        yield return (long)1;

        long prev = 0;
        long curr = 1;

        for (; ; )
        {
            long next = prev + curr;
            if (next < 0)   // It overflowed. Stop.
                yield break;

            yield return next;
            prev = curr;
            curr = next;
        }
    }
}