if-statement inside function

Question

I have this piece of code:

public static void Debug(string workName, string message, string logcontext, string exMessage = "")
{
    LogEventInfo logEvent = new LogEventInfo(LogLevel.Debug, logcontext, message + ": " + exMessage);
    ...
}

As you can see, the last parameter of the Debug method is optional ( string exMessage = "" ). That means that if I run this code as-is it will look fine if a exMessage arrived: "...message: exMessage"

However, If a exMessage wasn't provided, it will look like this: "...message: " (Note the trailing : ).

Of course, this can easily be solved by using something like this:

if(!String.IsNullOrEmpty(exMessage)
{
    ...(...,message + ": " + exMessage);
}
else
{
    ...(...,message);
} 

I want a more beautiful approach. Like if there is something in the lines of:

...(...(!exMessage -> ,message | else -> ,message + ": " + exMessage));

Is there some way of doing this in-line if-statement in C#? Can I use lambdas some how? (I'm super-new to the whole concept of lambdas)

Answer 1

您可以使用条件运算符

 exMessage == "" ? message : message + ": " + exMessage

Answer 2

There is its called the ?: operator. You use it like this:

var logText = string.IsNullOrEmpty(exMessage) ? message : message + ": " + exMessage;

Answer 3

LogEventInfo logEvent = new LogEventInfo(LogLevel.Debug, logcontext, message + (!string.IsNullOrEmpty(exMessage) ? ": " : string.Empty) + exMessage);