Question

I have a C# program that maps legacy text file report to an excel sheet. it works but it takes too long to run.
I wasn’t sure how but i read that one problem is using the IF statement that I should change that to the SWITCH clause. How do i do that?
here is a typical case.

     else if (line.Contains("BILLING PARTY 1")) {
                        string billingParty1 = line.Replace("BILLING PARTY 1", "");
                        if (!string.IsNullOrWhiteSpace(billingParty1)){
                            patient.BillingParty1 = billingParty1.Trim();
                        }
                    }

Answer 1

That advice doesn’t look like it applies here. You can use a switch statement to replace a long chain of ifs where you are checking to see if a field matches some value. For example:

if(foo == bar){
    Do1();
}
else if(foo == baz){
    Do2()
}

becomes

switch(foo)
{
    case bar:
       Do1();
       break;
    case baz:
       Do2();
       break;
}

In this case, it’s likely the compiler could generate faster code. But it seems like you have some more complicated conditions in your if statements as opposed to simple equality, so you won’t be able to use a switch, because in a switch,

Each case label specifies a constant value.

MS Ref