I am getting this error when I try to use switch case in dart. I have an abstract class and two classes extending it. See the code below
abstract class BankEvent{}
class FetchBanks extends BankEvent{}
class DeleteBank extends BankEvent{
final int bankId;
DeleteBank(this.bankId);
}
I have to make some implementations inside the handleEvents method depends on the instance of the class I am receiving as parameter. But I am getting the error (The switch case expression type 'Type' must be a subtype of the switch expression type 'BankEvent') in the case statement of switch case. My code for the switch case implementation is below
handleEvents(BankEvent bankEvent){
switch(bankEvent){
case FetchBanks:
break;
}
}
Why don't you just change your swith to an if statement, like so:
handleEvents(BankEvent bankEvent){
if(bankEvent is FetchBank){
// FetchBank stuff
}else if(bankEvent is DeleteBank){
// DeleteBank stuff
}
}
This works and is quite readable. Besides, you can get rid off the switch approach.
Yeah finally I found the answer after a bit of research.It should be writtern as below
handleEvents(BankEvent bankEvent){
switch(bankEvent.runtimeType){
case FetchBanks:
break;
}
}