在 C# 中将 if 转换为三元运算符

Question

how can I convert this simple if statement into:? (ternary) operator in C#?

case "amount": { if(!Decimal.TryParse( fvm.Value,out a)) a=Decimal.MinValue; break; }

Answer 1

You can either assign the value of a back to itself on success, or use a separate temporary variable (I'd prefer the latter):

case: "amount":
    a = decimal.TryParse(fvm.Value, out var tmp) ? tmp : decimal.MinValue;
    break;

Answer 2

a = Decimal.TryParse( fvm.Value,out var tmp) ? tmp : Decimal.MinValue;
break;

I would personally prefer to create an helper method

public static decimal? ParseDecimal(string str) => Decimal.TryParse(str, out var tmp) ? (decimal?)tmp : null;

since that would let you use the null-coalescing operator:

a = ParceDecimal(fvm.Value) ?? decimal.MinValue