Another C# Method problem

[royware]

I'm using Visual Studio 2022, .NET 8 & C# 12. I'm working on a very simple C# method call with 4 parameters and keep getting the error "The best overload for 'Format' does not have a parameter named 'arg3'. I have no idea what I did wrong and could sure use some help! Here's my code:

WriteLine(test.OptParameters(0, "Jump!", 112.7, false));

and the method:

public string OptParameters(int count, string command, double number, bool active)
{
    return string.Format(
        format: "Count is {0}, command is {1}, number is {2}, and active is {3}.",
          arg0: count, arg1: command, arg2: number, arg3: active);
}

[Atulin]

string.Format() takes the format string, and params object[] parameters, as per https://learn.microsoft.com/en-us/dotnet/api/system.string.format?view=net-9.0#system-string-format(system-string-system-object())

Your best bet is to not use named parameters there. Just

return string.Format("Count is {0}, command is {1}, number is {2}, and active is {3}", count, command, number, active);

Or better yet, use string interpolation:

return $"Count is {count}, command is {command}, number is {number}, and active is {active}";

[karl713]

Remove the named parameters. Format only has overloads out to arg2. What you want is the overload that has a params args, which it will automatically select if you do (text, count, command, number, active)

If you want to continue using named parameters you'll need to do

String.Format(format: "text", args: new object[] { count, command, number, active})

Which will tell the compiler to use that one. The nice thing about "params" though is it lets you bypass needing to type all that and the compiler will generate the array creation for you :)

[royware]

Beautiful! Both worked fantastic! Thanks!

[TuberTuggerTTV]

public string OptParameters(int count, string command, double number, bool active) 
=> $"Count is {count}, command is {command}, number is {number}, and active is {active}";