Мой совершенно сумасшедший взгляд на это:
class Program
{
static void Main(string[] args)
{
var i = 1;
var j = 34;
var k = true;
Match(i, j, k).
With(1, 2, false).Do(() => Console.WriteLine("1, 2, 3")).
With(1, 34, false).Do(() => Console.WriteLine("1, 34, false")).
With(x => i > 0, x => x < 100, x => x == true).Do(() => Console.WriteLine("1, 34, true"));
}
static Matcher<T1, T2, T3> Match<T1, T2, T3>(T1 t1, T2 t2, T3 t3)
{
return new Matcher<T1, T2, T3>(t1, t2, t3);
}
}
public class Matcher<T1, T2, T3>
{
private readonly object[] values;
public object[] Values
{
get { return values; }
}
public Matcher(T1 t1, T2 t2, T3 t3)
{
values = new object[] { t1, t2, t3 };
}
public Match<T1, T2, T3> With(T1 t1, T2 t2, T3 t3)
{
return new Match<T1, T2, T3>(this, new object[] { t1, t2, t3 });
}
public Match<T1, T2, T3> With(Func<T1, bool> t1, Func<T2, bool> t2, Func<T3, bool> t3)
{
return new Match<T1, T2, T3>(this, t1, t2, t3);
}
}
public class Match<T1, T2, T3>
{
private readonly Matcher<T1, T2, T3> matcher;
private readonly object[] matchedValues;
private readonly Func<object[], bool> matcherF;
public Match(Matcher<T1, T2, T3> matcher, object[] matchedValues)
{
this.matcher = matcher;
this.matchedValues = matchedValues;
}
public Match(Matcher<T1, T2, T3> matcher, Func<T1, bool> t1, Func<T2, bool> t2, Func<T3, bool> t3)
{
this.matcher = matcher;
matcherF = objects => t1((T1)objects[0]) && t2((T2)objects[1]) && t3((T3)objects[2]);
}
public Matcher<T1, T2, T3> Do(Action a)
{
if(matcherF != null && matcherF(matcher.Values) || matcher.Values.SequenceEqual(matchedValues))
a();
return matcher;
}
}