C# 7.1 and .NET Core 2.0 - Modern Cross-Platform Development - Third Edition

Making a generic method

Generics can be used for methods, even inside a non-generic type.

In PacktLibrary, add a new class named Squarer, with a generic method named Square, as shown in the following code:

using System;using System.Threading;namespace Packt.CS7{   public static class Squarer   {      public static double Square<T>(T input)      where T : IConvertible      {         double d = input.ToDouble(         Thread.CurrentThread.CurrentCulture);         return d * d;      }   }}

Note the following:

• The static Squarer class is non-generic.
• The static Square method is generic, and its type parameter T must implement IConvertible, so we know it has a ToDouble method. T is used as the type for the input parameter.
• ToDouble requires a parameter that implements IFormatProvider for understanding ...