C#•8mo ago

Issue with formatted WriteLine

I'm following along with C#12/.net8 and came across this snippet around Ch5. The first one works, the second one cannot parse args, this seems like something simple I'm just not getting. I can print bob.Born or the FavoriteAcientWonder(excuse the typo) but as soon as I add a 3rd arg it won't work.

 WriteLine(format: "{0}'s fav wonder is {1}. Integer is {2}",
    arg0: bob.Name,
    arg1: bob.FavoriteAcientWonder,
    arg2: (int)bob.FavoriteAcientWonder);


WriteLine(format: "{0}'s fav wonder is {1}. Integer is {2}. {0} was born on {3}",
    arg0: bob.Name,
    arg1: bob.FavoriteAcientWonder,
    arg2: (int)bob.FavoriteAcientWonder,
    arg3: bob.Born);

 WriteLine(format: "{0}'s fav wonder is {1}. Integer is {2}",
    arg0: bob.Name,
    arg1: bob.FavoriteAcientWonder,
    arg2: (int)bob.FavoriteAcientWonder);


WriteLine(format: "{0}'s fav wonder is {1}. Integer is {2}. {0} was born on {3}",
    arg0: bob.Name,
    arg1: bob.FavoriteAcientWonder,
    arg2: (int)bob.FavoriteAcientWonder,
    arg3: bob.Born);

15 Replies

Pobiega•8mo ago

I strongly recommend using interpolated strings instead of WriteLine with format strings

Console.WriteLine($"{bob.Name}'s fav wonder is {bob.AncientWonder}. Integer is {(int)bob.AncientWonder}");

Console.WriteLine($"{bob.Name}'s fav wonder is {bob.AncientWonder}. Integer is {(int)bob.AncientWonder}");

leowest•8mo ago

the superior way to WriteLine, approved, please submit the PR.

DisparateBitsOP•8mo ago

haha I will and I like that syntax, I was just curious why it didn't work and why ChatGPT/Bard also had no idea.

leowest•8mo ago

but interesting the last one fails.

jcotton42•8mo ago

https://learn.microsoft.com/en-us/dotnet/api/system.console.writeline?view=net-8.0

Console.WriteLine Method (System)

Writes the specified data, followed by the current line terminator, to the standard output stream.

leowest•8mo ago

I wonder if its a limitation of args as opposed to params

jcotton42•8mo ago

because there's no 4-arg overload

leowest•8mo ago

ah yeah that is what I was imagining

jcotton42•8mo ago

I strongly recommend you stay well away from ChatGPT and similar until after you're comfortable with C# because it often spits out complete garbage

leowest•8mo ago

I would suggest the same specially if you're learning

DisparateBitsOP•8mo ago

yeah i kinda get that feeling tbh. i am coming from java, i started learning spring boot but there are waaaay more c# jobs where i am and want to live. when they first came out i was very impressed and worried about the future, now I am mostly frustrated and angry unless it is dead-simple...

Pobiega•8mo ago

asp.net is like spring boot but better :kekw: you'll probably like it

jcotton42•8mo ago

LLMs are quite useful, but you need to actually understand the output to make use of them at least for me they're still in that stage where verifying the output is often more work than its worth

DisparateBitsOP•8mo ago

I appreciate the advice

Jimmacle•8mo ago

just remember all LLMs do is predict text they don't know how to program :when: that's usually what i use them for, autocomplete or making variations of some code based on something i already wrote or like a more chatty search engine

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Issue with formatted WriteLine