The switch statement: Unlike the if/else if/else statement, a switch statement can have a number of possible execution paths. A switch works with the primitive types, byte, short, char, and int, their respective wrapper types (Byte, Short, Character, and Integer), enumerated types, and the String type1. While an if-else statement is used to test expressions … Read more
Cause of the problem A variable name in a case clause is treated as a name capture pattern. It always matches and tries to make an assignment to the variable name. This is almost certainly not what was intended. Because the first matching case wins and because case OKAY always matches, the other case clauses … Read more
Actually this is possible using switch expression starting with C# 8. return a switch { 1 => “lalala”, 2 => “blalbla”, 3 => “lolollo”, _ => “default” }; Switch Expression There are several syntax improvements here: The variable comes before the switch keyword. The different order makes it visually easy to distinguish the switch expression … Read more
I also had this problem. Easy way to get around it: add a + sign before your variable in the switch, i.e. switch (+editMode) { case EditMode.Delete: … break; case EditMode.Edit: … break; default: … break; }
Personally, I would use the map, as its use implies a data lookup – using a switch usually indicates a difference in program behavior. Furthermore modifying the data mapping is easier with a map than with a switch. If performance is a real issue, profiling is the only way to get a usable answer. A … Read more
This is a bug. Here’s the specified behavior for a switch statement according to the Java Language Specification, 3rd Edition: JLS 14.11 The switch Statement SwitchStatement: switch ( Expression ) SwitchBlock When the switch statement is executed, first the Expression is evaluated. If the Expression evaluates to null, a NullPointerException is thrown and the entire … Read more
Be explicit It depends on what you are trying to achieve. The governing rule is It is better to be explicit. Omitting the cases simply makes it look like you forgot some. Being explicit assures subsequent readers of your code that you intended to do nothing for certain events. In light of that, you have … Read more
No you can’t use case and in like this. But you can do SELECT * FROM Product P WHERE @Status=”published” and P.Status IN (1,3) or @Status=”standby” and P.Status IN (2,5,9,6) or @Status=”deleted” and P.Status IN (4,5,8,10) or P.Status IN (1,3) BTW you can reduce that to SELECT * FROM Product P WHERE @Status=”standby” and P.Status … Read more