在C#中，可以通过重载多个方法来实现计算n的阶乘。以下是一个示例代码：

using System;class Factorial{public static int CalculateFactorial(int n){if (n == 0){return 1;}else{return n * CalculateFactorial(n - 1);}}public static long CalculateFactorial(long n){if (n == 0){return 1;}else{return n * CalculateFactorial(n - 1);}}public static double CalculateFactorial(double n){if (n == 0){return 1;}else{return n * CalculateFactorial(n - 1);}}public static void Main(){int nInt = 5;long nLong = 10;double nDouble = 15.5;Console.WriteLine($"{nInt}! = {CalculateFactorial(nInt)}");Console.WriteLine($"{nLong}! = {CalculateFactorial(nLong)}");Console.WriteLine($"{nDouble}! = {CalculateFactorial(nDouble)}");}}

在上面的示例中，我们定义了三个不同数据类型的重载方法，分别用于计算整数、长整数和双精度浮点数的阶乘。您可以根据需要添加更多重载方法来支持其他数据类型。