C#•3mo ago

how do i check if a string contains only words and space

ive got an if statement that needs to check if a string contains only letters or spaces, online i can only find how to check for only letters which then flags the spaces as not letters

4 Replies

js•3mo ago

like for example if the string is "Fast Food Emporium" it would flag as invalid as it has spaces even though that is valid i just want to make sure it only contains characters and spaces

public static void ContainsOnlyLetters(this string input)
{
    int count5 = 0;
    foreach (char c in input) 
    {
        if (!Char.IsLetterOrDigit(c))
            count5++;
        else if (!Char.IsWhiteSpace(c))
            count5++;
    }

    if (count5 != input.Length)
    {
        Console.WriteLine("Invalid restaurant name in file, please select a valid file.");
        LoadFoodMenu();
    }
    else
    {
        return;
    }

}

public static void ContainsOnlyLetters(this string input)
{
    int count5 = 0;
    foreach (char c in input) 
    {
        if (!Char.IsLetterOrDigit(c))
            count5++;
        else if (!Char.IsWhiteSpace(c))
            count5++;
    }

    if (count5 != input.Length)
    {
        Console.WriteLine("Invalid restaurant name in file, please select a valid file.");
        LoadFoodMenu();
    }
    else
    {
        return;
    }

}

i managed this is that ok ? doesnt work ugh

daniel2•3mo ago

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

Char.IsLetter Method (System)

Indicates whether a Unicode character is categorized as a Unicode letter.

js•3mo ago

i got it working but the api is so confusing to me as a beginner is that normal

Angius•3mo ago

Depends what exactly is so confusing But yes, it's generally normal to be confused about the things you're new at

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how do i check if a string contains only words and space