在C#中最后一次出现逗号时拆分字符串

using System;
using System.Linq;

public class Program
{
    public static void Main()
    {
        string input = "apple,banana,grape,orange";
        string[] result = SplitStringAtLastComma(input);
        
        foreach (var item in result)
        {
            Console.WriteLine(item);
        }
    }

    public static string[] SplitStringAtLastComma(string input)
    {
        int lastCommaIndex = input.LastIndexOf(',');
        if (lastCommaIndex == -1)
        {
            return new string[] { input };
        }
        else
        {
            string[] parts = new string[2];
            parts[0] = input.Substring(0, lastCommaIndex);
            parts[1] = input.Substring(lastCommaIndex + 1);
            return parts;
        }
    }
}