How do I write test code to exercise a C# generic Pair<TKey, TValue> ?
- by Scott Davies
Hi,
I am reading through Jon Skeet's "C# in Depth", first edition (which is a great book). I'm in section 3.3.3, page 84, "Implementing Generics". Generics always confuse me, so I wrote some code to exercise the sample. The code provided is:
using System;
using System.Collections.Generic;
public sealed class Pair<TFirst, TSecond> : IEquatable<Pair<TFirst, TSecond>>
{
private readonly TFirst first;
private readonly TSecond second;
public Pair(TFirst first, TSecond second)
{
this.first = first;
this.second = second;
}
...property getters...
public bool Equals(Pair<TFirst, TSecond> other)
{
if (other == null)
{
return false;
}
return EqualityComparer<TFirst>.Default.Equals(this.First, other.First) &&
EqualityComparer<TSecond>.Default.Equals(this.Second, other.Second);
}
My code is:
class MyClass
{
public static void Main (string[] args)
{
// Create new pair.
Pair thePair = new Pair(new String("1"), new String("1"));
// Compare a new pair to previous pair by generating a second pair.
if (thePair.Equals(new Pair(new string("1"), new string("1"))))
System.Console.WriteLine("Equal");
else
System.Console.WriteLine("Not equal");
}
}
The compiler complains:
"Using the generic type 'ManningListing36.Paie' requires 2 type argument(s) CS0305"
What am I doing wrong ?
Thanks,
Scott
