Thursday, January 28, 2010

Thursday, January 21, 2010

LINQ extension method to Capitalize string

LINQ extension method to Capitalize first letter of each word in a sentence:

public static string Capitalize(this string s)
{
    return s.ToCharArray().Aggregate(String.Empty,
      (currentWord, nextWord) =>
        currentWord.Length == 0 && nextWord != ' ' ? nextWord.ToString().ToUpper() : (
          currentWord.EndsWith(" ") ? currentWord + nextWord.ToString().ToUpper() :
            currentWord + nextWord.ToString()
      )
    );
}

Sunday, January 17, 2010

Thursday, January 14, 2010

Return collection of anonymous type from method in LINQ

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Let’s say you have some method that execute a LINQ query over collection and constructs a collection of (new) anonymous type as result. Here is how you can return it and use it below the scope of the method:
public class Program
{
public static IEnumerable<T> GetExampleCollection<T>(T type)
{
// generate some random collection simulating source data
var random = new Random();
var collection =
Enumerable.Repeat(0, 100).Select(
i => new { ClientId = random.Next(), OrderId = random.Next(), Price = random.NextDouble() });

// run some linq query over it
var queryOverCollection = from item in collection
where item.ClientId % 2 == 0
select new { DoublePrice = item.Price * 2.0 };
IQueryable v = (from item in collection
where item.ClientId % 2 == 0
select new { DoublePrice = item.Price * 2.0 }).AsQueryable();

return queryOverCollection as IEnumerable<T>;
}

static void Main(string[] args)
{
// bring collection of anonymous type items from a method!
var v = GetExampleCollection(new { DoublePrice = new double() });
foreach (var item in v)
{
// ... and use it!
Console.WriteLine(item.DoublePrice);
}
}
}



Note, that anonymous type is resolved on the assemble level, so you can’t reference it in another assembly.

Wednesday, January 13, 2010

SQL connection string application name

Add “Application Name=My Application Name” to connection string to differentiate your connections (e.g. in SQL Profiler).
(it’s a self reminder post).