Visual Studio Hacks

Refactor Your Code #14

Chapter 2, Master the Editor

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67

HACK

interface IStart

{

bool IsStarted { get; set; }

}

Visual Studio will also modify the existing class to implement the new inter-

face. The Extract Interface function is a great time-saver when you need to

create an interface that is based on a current class.

Parameter Functions

The next three functions on the menu all focus on working with parame-

ters. Since the sample class does not currently contain any methods with

parameters, go ahead and add a new method with a number of different

parameters. Here is a method called

Collision that you can add to this class:

public void Collision(DateTime CrashDate, int Speed, int DamagePct)

{

int costMultiplier = 1;

// Do stuff

}

As you can see, this method has a local variable called costMultiplier and

sets the value to

1. But suppose that costMultiplier varies from vehicle to

vehicle. In this case, you’d want to pass in this multiplier as a parameter

instead of creating it as a local variable. The first of the parameter refactor-

ing functions will do just that. First, right-click on the

costMultiplier vari-

able and select the Promote Local Variable to Parameter function. This will

take the local variable and add it as a parameter to the method. Here is a

look at the modified code:

public void Collision(int costMultiplier, DateTime CrashDate,

int Speed, int DamagePct)

{

// Do stuff

}

You may be thinking that ...