C++ Split System.String and use in String.Format

Question

Essentially, I have a string that has placeholders that I am passing into String::Format(), as such:

"The {0} brown {1} jumped over the {2} {3}."

And I have another comma delimited string which contains the strings I wish to fill in to the formatting placeholders, as such:

"quick,fox,lazy,dog"

So it would only seem natural that to fill the format string I would Split(',') the second string, and pass that as the second argument in Format(first_str, second_split_array);

But splitting the second array produces a System::Array^ which Format() sees as only one object, thus getting angry and telling me my index must be less than or equal to the number of arguments passed.

Last I heard, String.Format() can use an array as the second arg, so... what do I have to do to get the string split in a way that Format() will see as all the args?

Edit:

The idea here is that the number of indexed elements is not the same every time. The goal I am trying to achieve is to take data sent from a server and fill it in to a template. The server sends back a comma delimited list and a template name. So, for the quick fox example it'd send what I have above, but other times It'll send, say, error, which uses:

"An error has occurred: {0} (Details: {1})"

and the server arguments "Error Name,Error text description and such."

But the amount of possible indexed results from the comma delimited list can be anything. I'll edit to elaborate. — William Eisert
– William Eisert, Commented Oct 20, 2012 at 18:10
I checked msdn again. msdn.microsoft.com/en-us/library/b1csw23d.aspx — Lews Therin
– Lews Therin, Commented Oct 20, 2012 at 18:11

Hans Passant · Accepted Answer · 2012-10-20 18:25:18Z

2

Not sure what the question is really about, you can indeed pass an array of strings to String::Format(). The String::Split() method makes it simple to generate one:

int main(array<System::String ^> ^args)
{
    String^ text = "quick,fox,lazy,dog";
    array<String^>^ words = text->Split(',');
    String^ result = String::Format("The {0} brown {1} jumped over the {2} {3}.", words);
    Console::WriteLine(result);
    return 0;
}

Output:

The quick brown fox jumped over the lazy dog.

answered Oct 20, 2012 at 18:25

Hans Passant

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Comments

user1610015 · Accepted Answer · 2012-10-20 18:44:55Z

0

It's probably because you're passing an array<String^>^ as the second argument to String::Format. If you want the overload of String::Format that takes an array as the second argument (and uses each element in the array as the formatting items), you need to pass an array<Object^>^ (where each Object^ is a String^).

edited Oct 20, 2012 at 18:44

answered Oct 20, 2012 at 18:13

user1610015

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3 Comments

William Eisert Over a year ago

I saw that in the MSDN article, I'm assuming there isn't a direct cast, so... I'd have to create an Array<Object^>^ and populate it with values from my string array?

user1610015 Over a year ago

I think so. It not a big change, as a String^ can be converted to an Object^ automatically (no cast). The only thing that will change is the declaration of the Array variable.

William Eisert Over a year ago

I was originally using System::Array^ MainArgs = server_response.Split(','); and changed it to array<System::Object^>^ MainArgs = server_response.Split(','); and I think it might be working fine... I'll do more tests.

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