Question 396508 in ASP.NET Question posted in
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Asp.net – .NET 8 converts uppercase Turkish 'I' to lowercase 'i' instead of 'ı'"

I’m working with .NET 8 and encountering an issue with character conversion in Turkish text. According to Turkish language rules, when converting uppercase ‘İ’ to lowercase, it should become ‘ı’. However, in my .NET 8 application, it converts ‘İ’ to ‘i’ instead. How can I ensure that .NET 8 handles this conversion correctly to ‘ı’?

.Net 8

var toLower = "Iı".ToLower();

// Output 
// iı

.NET Framework 4.7

var toLower = "Iı".ToLower();

// Output 
// ıı
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2

Answers


  1. 0

    Use CultureInfo("tr-TR") in .NET 8 for the conversion.

    Refer the code below:

    using System;
using System.Globalization;

class Program
{
    static void Main()
    {
        var turkishCulture = new CultureInfo("tr-TR");
        var text = "Iı";
        var toLower = text.ToLower(turkishCulture);
        Console.WriteLine(toLower); // Output: ıı
    }
}

    Refer to the working .netfiddle here

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  2. 0

    Implementation of these two methods in .NetFemeWork and .Net
    similar as shown below, both of which use CurrentCulture

    in .Net

     public string ToLower(CultureInfo? culture)
 {
     CultureInfo cult = culture ?? CultureInfo.CurrentCulture;
     return cult.TextInfo.ToLower(this);
 }

    in .NetFrameWork

    public string ToLower()
{
    return ToLower(CultureInfo.CurrentCulture);
}

    If you want to explicitly mention which culture to use, the code will be as follows

     var toLower = "Iı".ToLower(new CultureInfo("tr-TR"));
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