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My starting point is a string separated by commas, containing a variable number of integers e.g.:

System::String^ tags=gcnew String("1,3,5,9");

Now I would like - with the least amount of steps possible - convert this string into a Integer list:

List<System::Int32>^  taglist= gcnew List<System::Int32>();//to contain 1,3,5,9

Additionally, after manipulating the list, I need to export it back to a string at the end of the day. I saw the question being asked for C# here but not for C++ which will be slightly different.

I tried directly initialize using the string, but that failed. I also tried .Split but that produces strings. I also dont want to do any complicated streamreader stuff. The answer in the link must have an equivalent for C++/cli.

DISC-O
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1 Answers1

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As it mentioned in a comments you can use Split to convert the string to an array of strings, then you can use Array::ConvertAll to convert to an array of int values and after manipulating the values you can ise String::Join to convert an array of ints to a single string.

Here's a code sample:

String^ tags = gcnew String("1,3,5,9");
String^ separator = ",";
array<String^>^ tagsArray = tags->Split(separator->ToCharArray());

array<int>^ tagsIntArray = Array::ConvertAll<String^, int>(tagsArray,
    gcnew Converter<String^, int>(Int32::Parse));

// Do your stuff

String^ resultString = String::Join<int>(separator, tagsIntArray);
Sergey Shevchenko
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  • That would do the trick, but I would prefer to use a list instead of an array. With the answer I can easily get to and from a List: List^ taglist= gcnew List(tagsIntArray); and String^ resultStringfromlist = String::Join(separator, taglist); BONUS question: can I go to the list and back without the interim step of the array? – DISC-O Jan 31 '18 at 12:52
  • Yes and no :). I believe you'll need to create a `List` object by yourself (just like you described), but at least you can pass this list to `String::Join` method without converting back to `array^`. – Sergey Shevchenko Jan 31 '18 at 13:40