C#

string siteCode = "U+1F914";
int i = Convert.ToInt32(siteCode.Replace("U+", "0x"), 16);

<pre lang="c#">txtresults.Text = txttext.Text.Replace("U+", "0x").ToLower();</pre>

Failwyn wrote:

Ultimately, I don't want there to be anything different between the classes other than the ability to use a simplified signature.

MyClass<Guid> a = new MyClass<Guid>();
MyClass<Guid, Guid, Guid, Guid> b = a; // Works
MyClass<Guid> c = b; // Won't compile - needs an explicit cast

MyClass<Guid, Guid, Guid, Guid> a = new MyClass<Guid, Guid, Guid, Guid>();
MyClass<Guid> b = (MyClass<Guid>)a; // Compiles, but fails at runtime
MyClass<Guid> c = a as MyClass<Guid>; // Compiles and runs, but result is null

using MyClassGuid = MyClass<Guid, Guid, Guid, Guid>;
...
MyClassGuid a = new MyClassGuid();

public static class MyClass
{
    public static MyClass<T1, T2, T3, T4> Create<T1, T2, T3, T4>(T1 value1, T2 value2, T3 value3, T4 value4)
    {
        return new MyClass<T1, T2, T3, T4>(value1, value2, value3, value4);
    }
    
    public static MyClass<T1, T1, T1, T1> Create<T1>(T1 value)
    {
        return new MyClass<T1, T1, T1, T1>(value, value, value, value);
    }
}
...
MyClass<Guid, Guid, Guid, Guid> a = MyClass.Create(Guid.New());
MyClass<string, int, decimal, DateTime> b = MyClass.Create("Hello", 42, 123.45M, DateTime.Today);

using System;

public class Program
{
    public static void Main()
    {
        Console.WriteLine(MyClass.Create(Guid.NewGuid()).GetType());
        Console.WriteLine(MyClass.Create("Hello", 42, 123.45M, DateTime.Today).GetType());
    }
}

public class MyClass<T1, T2, T3, T4> 
{
    public MyClass(T1 value1, T2 value2, T3 value3, T4 value4) { }
}

public static class MyClass
{
    public static MyClass<T1, T2, T3, T4> Create<T1, T2, T3, T4>(T1 value1, T2 value2, T3 value3, T4 value4)
    {
        return new MyClass<T1, T2, T3, T4>(value1, value2, value3, value4);
    }
    
    public static MyClass<T1, T1, T1, T1> Create<T1>(T1 value)
    {
        return new MyClass<T1, T1, T1, T1>(value, value, value, value);
    }
}

MyClass`4[System.Guid,System.Guid,System.Guid,System.Guid]
MyClass`4[System.String,System.Int32,System.Decimal,System.DateTime]

public class MyClass<T1, T2, T3, T4>
{
    public MyClass(T1 value1, T2 value2, T3 value3, T4 value4) { }
}