Quickest way to enumerate the alphabet

问题:

I want to iterate over the alphabet like so:

foreach(char c in alphabet)
{
 //do something with letter
}

Is an array of chars the best way to do this? (feels hacky)

Edit: The metric is "least typing to implement whilst still being readable and robust"

回答1:

(Assumes ASCII, etc)

for (char c = 'A'; c <= 'Z'; c++)
{
    //do something with letter 
} 

Alternatively, you could split it out to a provider and use an iterator (if you're planning on supporting internationalisation):

public class EnglishAlphabetProvider : IAlphabetProvider
{
    public IEnumerable<char> GetAlphabet()
    {
        for (char c = 'A'; c <= 'Z'; c++)
        {
            yield return c;
        } 
    }
}

IAlphabetProvider provider = new EnglishAlphabetProvider();

foreach (char c in provider.GetAlphabet())
{
    //do something with letter 
} 

回答2:

Or you could do,

string alphabet = "abcdefghijklmnopqrstuvwxyz";

foreach(char c in alphabet)
{
 //do something with letter
}

回答3:

var alphabet = Enumerable.Range(0, 26).Select(i => Convert.ToChar('A' + i));

回答4:

Enumerable.Range(65, 26).Select(a => new { A = (char)(a) }).ToList().ForEach(c => Console.WriteLine(c.A));

回答5:

Well to use the foreach loop in C#, alphabet can be any IEnumerable<char>. What feels "hacky" about it?

回答6:

You could do this:

for(int i = 65; i <= 95; i++)
{
    //use System.Convert.ToChar() f.e. here
    doSomethingWithTheChar(Convert.ToChar(i));
}

Though, not the best way either. Maybe we could help better if we would know the reason for this.

回答7:

I found this:

foreach(char letter in Enumerable.Range(65, 26).ToList().ConvertAll(delegate(int value) { return (char)value; }))
{
//breakpoint here to confirm
}

while randomly reading this blog, and thought it was an interesting way to accomplish the task.

回答8:

Use Enumerable.Range:

Enumerable.Range('A', ('Z' - 'A' + 1)).Select(i => (char)i)