Contents tagged with .net asp.net strategy pattern C# common design patterns
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Chicago Code Camp Video
This May 14, I had a great time at Chicago Code Camp. Thanks to the organizing team to have organized the event really well.
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Strategy Pattern Using Delegates (Func)- www.Hands-On-Coding.net presentation on Dec 14, 2010
Strategy Pattern using Func
An alternative to using Strategy pattern using interfaces is Strategy Pattern using delegates.
• Create a class with all the different strategies.
public class Calculator
{
public static int Add(int num1, int num2)
{
return num1 + num2;
}
public static int Subtract(int num1, int num2)
{
return num1 - num2;
}
public static int Multiply(int num1, int num2)
{
return num1 * num2;
}
public static int Divide(int num1, int num2)
{
return num1 / num2;
}
}
• Test the code.
int a = 100;
int b = 50;
Func<int, int, int> calculate = Calculator.Add;
int sum = calculate(100, 50);
calculate = Calculator.Subtract;
int difference = calculate(100, 50);
calculate = Calculator.Multiply;
int product = calculate(100, 50);
If you are new to the syntax, Func. Func is like a delegate that in the above case takes the first two ints as input and outputs the int (third).
Another cool way of using Func is using lambda expressions.
Func<int, int, int> calculate;
calculate = (x, s) => x + s;
We could do the above in a single line itself. But what it means is changing the strategly on the fly. Func is a pretty cool feature that reduces a lot of the delegate code we had to write in .NET 2.0. Happy coding ! -
Strategy Pattern - www.Hands-On-Coding.net presentation on Dec 14, 2010
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