Create as many n-tuples as you like

Tuples.tt

<#@ template debug="false" hostspecific="true" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Runtime.Remoting.Messaging" #>
<#@ output extension=".Designer.cs" #>
using System.Collections.Generic;

namespace <#=CallContext.GetData("NamespaceHint")#>
{

<#
const int TotalTuples = 16;

for (int i = 1; i < TotalTuples; i++)
{
    var numbers = Enumerable.Range(1, i);
#>
    public static partial class Tuple
    {
        public static Tuple<<#=string.Join(", ", numbers.Select(x=>"T"+x)) #>> Create<<#=string.Join(", ", numbers.Select(x=>"T"+x)) #>>(<#=string.Join(", ", numbers.Select(x=>"T"+x+" item"+x)) #>)
        {
            return new Tuple<<#=string.Join(", ", numbers.Select(x=>"T"+x)) #>>(<#=string.Join(", ", numbers.Select(x=>"item"+x))#>);
        }
    }

    public class Tuple<<#=string.Join(", ", numbers.Select(x=>"T"+x)) #>>
    {
        public Tuple(<#=string.Join(", ", numbers.Select(x=>"T"+x+" item"+x)) #>)
        {
<#
    foreach (var n in numbers)
    {
#>
            Item<#= n #> = item<#= n #>;
<#
    }
#>
        }

<#
    foreach (var n in numbers)
    {
#>
        public T<#= n #> Item<#= n #> { get; private set; }
<#
    }
#>

        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null, obj))
            {
                return false;
            }
            if (ReferenceEquals(this, obj))
            {
                return true;
            }
            if (obj.GetType() != this.GetType())
            {
                return false;
            }
            var o = (Tuple<<#=string.Join(", ", numbers.Select(x=>"T"+x)) #>>)obj;
<#
    foreach (var n in numbers)
    {
#>
            if(!EqualityComparer<T<#=n#>>.Default.Equals(this.Item<#=n#>, o.Item<#=n#>)){ return false; }
<#
    }
#>
            return true;
        }

        public override int GetHashCode()
        {
            unchecked
            {
                var hashCode = 0;
<#
    foreach (var n in numbers)
    {
#>
                hashCode = (hashCode*397) ^ EqualityComparer<T<#=n#>>.Default.GetHashCode(Item<#=n#>);
<#
    }
#>
                return hashCode;
            }
        }
    }

<#
}
#>
}