Concat arabic and english string with string.Format()

Question

Have some trouble with concat two string.

return string.Format("{0}{1}{2}",
            IdWithSubType,

            ExtraInfo.Any(info => info.InfoType == UniExtraInfoType.Alias)
            ? string.Format(" ({0})", string.Join(",", ExtraInfo.First(info => info.InfoType == UniExtraInfoType.Alias).Info))
            : "",

            Context != null
            ? string.Format(" ({0})", Context.IdWithSubType)
            : "");

it's ok when IdWithSubType, extrainfo and context has latin or kirillic symbols, but IdWithSubType can be arabic, and concat with that is wrong. e.g.100252575)طائرات هليكوبت@vk.com) arabic and other symbols mixed, but i need something like "here arabic string" (100252575@vk.com. it would be great if this problem have solve with String.Format. Hope for your help. Thank you

Ok. I have absolutely no idea what you're trying to ask with this question — Joe Phillips, Jul 06 '17 at 17:01
Yes using string format will help combine two strings that were encoded use two different encoding. string output = string.Format("{0} {1}", string1, string2); — jdweng, Jul 06 '17 at 17:15
@jdweng what encoding you are talking about? This seem to be regular rtl/ltr question rather than about encodings... — Alexei Levenkov, Jul 06 '17 at 18:07
It is encoding issues. The issue is a string that go left to right with one that goes right to left. — jdweng, Jul 06 '17 at 19:02

score 6 · Accepted Answer · answered Jul 07 '17 at 01:48

It's likely no encoding issues appear there, just how RTL (right-to-left) string follows arrangement as part of LTR (left-to-right) string.

There's 2 characters which commonly used in bidirectional formatting to mark either LTR & RTL part, assigned as 0x200e (LTR) & 0x200f (RTL). In this case, use 0x200e to mark end of RTL part (in Arabic) and starting LTR part:

string leftToRight = ((char)0x200E).ToString();

// using string.Format
return string.Format("{0}{1}{2}{3}",
            IdWithSubType,
            leftToRight,

            ExtraInfo.Any(info => info.InfoType == UniExtraInfoType.Alias)
            ? string.Format(" ({0})", string.Join(",", ExtraInfo.First(info => info.InfoType == UniExtraInfoType.Alias).Info))
            : "",

            Context != null
            ? string.Format(" ({0})", Context.IdWithSubType)
            : "");,

// alternative: using string.Join
return string.Join(leftToRight, IdWithSubType,
            ExtraInfo.Any(info => info.InfoType == UniExtraInfoType.Alias)
            ? string.Format(" ({0})", string.Join(",", ExtraInfo.First(info => info.InfoType == UniExtraInfoType.Alias).Info))
            : "",

            Context != null
            ? string.Format(" ({0})", Context.IdWithSubType)
            : "");,

Demo: .NET Fiddle Example

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