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Add description of when clause (#22464)

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Marcin Grygierczyk
2018-11-22 13:57:49 +01:00
committed by Tom
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commit 7ea5810a8a
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guide/english/csharp/switch-case/index.md
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@ -60,5 +60,44 @@ switch(myColor) {
```
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.
```csharp
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).
### Sources:
- 1 https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/switch