How do you refactor a switch case in C#?

Apply the Replace Type Code with Subclasses refactoring:

  1. Add subclasses for each type represented by the type code.
  2. Use a factory method to create the subclass objects based on the type.
  3. Apply Push Down Method by moving the switch-statement-abusing methods to the subclasses.

What is wrong with switch statements?

We must find an alternative to switch statements. Last but not least, because a switch statement requires us to modify a lot of classes, it violates the Open-Closed Principle from the SOLID principles. To conclude, switch statement are bad because they are error-prone and they are not maintainable.

Does C# have switch statements?

In C#, Switch statement is a multiway branch statement. It provides an efficient way to transfer the execution to different parts of a code based on the value of the expression. The switch expression is of integer type such as int, char, byte, or short, or of an enumeration type, or of string type.

Why should we not use switch case?

Switch case is not a bad syntax, but its usage in some cases categorizes it under code smell. It is considered a smell, if it is being used in OOPS. Thus, Switch case should be used very carefully.

Are switch statements code smell?

Switch statements are often (and rightfully, in my opinion) considered to be a code smell. A code smell, if you’ll recall, is a superficial characteristic of code that is often indicative of deeper problems. It’s similar in concept to the term “red flag” for interpersonal relationships.

How do I change a switch case?

Start by moving the plastic pieces from one shell to the new shell and screwing them in. Place the new shell on the back of the Switch itself, and screw it down in the reverse order you removed the screws. Ensure they are all in tight and you haven’t missed any screws, then turn on your Switch and give it a whirl.

What is a good way to avoid switch statements?

Here are some alternatives to switch statement :

  • lookup table.
  • polymorphism.
  • pattern matching (especially used in functional programming, C++ templates)

Are switch statements inefficient?

Although there are minor efficiency gains when using a switch compared to using an if-statement, those gains would be negligible under most circumstances.

Should I use switch or if?

Use switch every time you have more than 2 conditions on a single variable, take weekdays for example, if you have a different action for every weekday you should use a switch. Other situations (multiple variables or complex if clauses you should Ifs, but there isn’t a rule on where to use each.

Is switch faster than if else?

A switch statement works much faster than an equivalent if-else ladder. It’s because the compiler generates a jump table for a switch during compilation. As a result, during execution, instead of checking which case is satisfied, it only decides which case has to be executed.

When should I use switch statements?

Use switch instead of if when:

  1. You are comparing multiple possible conditions of an expression and the expression itself is non-trivial.
  2. You have multiple values that may require the same code.
  3. You have some values that will require essentially all of another value’s execution, plus only a few statements.

Are switch statements faster than if-else?

As it turns out, the switch statement is faster in most cases when compared to if-else , but significantly faster only when the number of conditions is large. The primary difference in performance between the two is that the incremental cost of an additional condition is larger for if-else than it is for switch .