Question

http://code.google.com/p/dapper-dot-net/source/browse/PerformanceTests.cs

Confused, PerformanceTest.Run initializes the list by adding test objects.

How does it actually run the query?

I’m guessing it is the line:

for (int i = 1; i <= iterations; i++)
{
    foreach (var test in this.OrderBy(ignore => rand.Next()))
    {
        test.Watch.Start();
        test.Iteration(i);
        test.Watch.Stop();
    }
}

test.iteration(i);

But how? Is this a delegate?

Answer 1

Yes, Action type is the key here. Action<T> is a built-in delegate type that has no return value and (in this case) takes one parameter of type T. Iteration is the property of type Action<int> where the test action is stored in Test object, and () operator just invokes the method with i parameter.