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Switch Case |
Switch Case
Switch is a selection statement that chooses a switch case section depending on the value matched with the expression/value being evaluated.1 If none of the case statements match the value of the switched variable, the default path is chosen. The switch statement is like a set of if statements
. We exit from the switch by break
.
Example
public enum Colors { Red, Blue, Green, Orange }
Colors myColor;
... myColor is set to one of the enum values ...
switch(myColor){
case Colors.Red:
Console.WriteLine("How you like them apples?");
break;
case Colors.Blue:
Console.WriteLine("Ice Ice Baby...");
break;
case Colors.Green:
Console.WriteLine("Fore!");
break;
default:
Console.WriteLine("I have a hard time when I try to rhyme.");
}
Output
If myColor is Colors.Red:
> How you like them apples?
If myColor is Colors.Blue:
> Ice Ice Baby...
If myColor is Colors.Green:
> Fore!
If myColor is Colors.Orange:
> I have a hard time when I try to rhyme.
Fallthrough
It is also possible to use multiple statements produce the same outcome, by letting the cases 'fallthrough', like so:
switch(myColor) {
case Colors.Red:
case Colors.Blue:
//Code
break;
...
}
This will execute the same lines of code if myColor is either Red or Blue.
When clause
Starting with C# 7.0 you can use when
clause to specify additional condition that must be satisfied. When clause is optional and is used right after specific case.
Dog dog = new Dog
{
Name = "Charlie",
Breed = "Affenpinscher",
Age = 3
};
switch (dog)
{
case Dog d when d.Breed == "Affenpinscher" && d.Age >= 6:
Console.WriteLine($"{dog.Name} is considered a senior dog.");
break;
case Dog d when d.Breed == "Affenpinscher" && d.Age >= 2:
Console.WriteLine($"{dog.Name} is considered an adult dog.");
break;
case Dog d when d.Breed == "Affenpinscher":
Console.WriteLine($"{dog.Name} is considered a puppy.");
break;
case Dog d when d.Breed == "Chihuahua" && d.Age >= 4:
Console.WriteLine($"{dog.Name} is considered a senior dog.");
break;
case Dog d when d.Breed == "Chihuahua" && d.Age >= 2:
Console.WriteLine($"{dog.Name} is considered an adult dog.");
break;
case Dog d when d.Breed == "Chihuahua":
Console.WriteLine($"{dog.Name} is considered a puppy.");
break;
default:
Console.WriteLine($"We have no information according {dog.Breed} breed.");
break;
}
As you see in the above example after when
keyword you should specify logical condition (an instruction that returns bool value).