Generic Structures

C# allows you to create generic structures. The syntax is the same as for generic classes. For example, in the following program, the XY structure, which stores X, Y coordinates, is generic:

// Demonstrate a generic struct.
using System;

// This structure is generic.
struct XY<T> {
  T x;
  T y;

  public XY(T a, T b) {
    x = a;
    y = b;
  }

  public T X {
    get { return x; }
    set { x = value; }
  }

  public T Y {
    get { return y; }
    set { y = value; }
  }

}

class StructTest {
  public static void Main() {
    XY<int> xy = new XY<int>(10, 20);
    XY<double> xy2 = new XY<double>(88.0, 99.0);
    Console.WriteLine(xy.X + ", " + xy.Y);

    Console.WriteLine(xy2.X + ", " + xy2.Y);
  }
}

The output is shown here:

10, 20
88, 99

Like generic classes, generic structures can have constraints. For example, this version of XY restricts type arguments to value types:

struct XY<T> where T : struct {
// ...

Technorati : C# Generics