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C# switch Statement
The switch statement allows you to execute different blocks of code based on the value of a variable.
Basic switch Statement
int dayNumber = 3;
switch (dayNumber)
{
case 1:
Console.WriteLine("Monday");
break;
case 2:
Console.WriteLine("Tuesday");
break;
case 3:
Console.WriteLine("Wednesday");
break;
case 4:
Console.WriteLine("Thursday");
break;
case 5:
Console.WriteLine("Friday");
break;
case 6:
Console.WriteLine("Saturday");
break;
case 7:
Console.WriteLine("Sunday");
break;
default:
Console.WriteLine("Invalid day");
break;
}switch with String
string grade = "A";
switch (grade)
{
case "A":
Console.WriteLine("Excellent!");
break;
case "B":
Console.WriteLine("Good job!");
break;
case "C":
Console.WriteLine("Average");
break;
case "D":
Console.WriteLine("Below average");
break;
case "F":
Console.WriteLine("Failed");
break;
default:
Console.WriteLine("Invalid grade");
break;
}Multiple Cases (Fall-through)
char operation = '+';
switch (operation)
{
case '+':
case 'a':
Console.WriteLine("Addition");
break;
case '-':
case 's':
Console.WriteLine("Subtraction");
break;
case '*':
case 'm':
Console.WriteLine("Multiplication");
break;
case '/':
case 'd':
Console.WriteLine("Division");
break;
default:
Console.WriteLine("Unknown operation");
break;
}switch Expression (C# 8.0+)
// Traditional switch
string GetDayType(int day)
{
return day switch
{
1 or 2 or 3 or 4 or 5 => "Weekday",
6 or 7 => "Weekend",
_ => "Invalid day"
};
}
// Pattern matching
string DescribeObject(object obj)
{
return obj switch
{
int i when i > 0 => "Positive integer",
int i when i < 0 => "Negative integer",
int => "Zero",
string s when s.Length > 0 => "Non-empty string",
string => "Empty string",
null => "Null value",
_ => "Unknown type"
};
}Enum with switch
enum Status
{
Pending,
Approved,
Rejected,
Cancelled
}
Status currentStatus = Status.Approved;
switch (currentStatus)
{
case Status.Pending:
Console.WriteLine("Waiting for approval");
break;
case Status.Approved:
Console.WriteLine("Request approved");
break;
case Status.Rejected:
Console.WriteLine("Request rejected");
break;
case Status.Cancelled:
Console.WriteLine("Request cancelled");
break;
}💡 Best Practices
- Always include a default case
- Don't forget break statements to prevent fall-through
- Use switch expressions for simple mappings
- Consider using if-else for complex conditions
- Group related cases together
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