如何通过Windows命令提示符和C#更改一个字符串中的两个项目

using System;

class StringManipulation
{
    static void Main()
    {
        string originalString = "Hello World";
        string newString = ReplaceTwoItems(originalString, "Hello", "Goodbye");
        Console.WriteLine(newString);
    }

    static string ReplaceTwoItems(string originalString, string oldItem, string newItem)
    {
        int index1 = originalString.IndexOf(oldItem);
        int index2 = originalString.IndexOf(oldItem, index1 + oldItem.Length);

        if (index1 != -1 && index2 != -1)
        {
            string firstPart = originalString.Substring(0, index1);
            string middlePart = originalString.Substring(index1 + oldItem.Length, index2 - index1 - oldItem.Length);
            string lastPart = originalString.Substring(index2 + oldItem.Length);

            return firstPart + newItem + middlePart + newItem + lastPart;
        }

        return originalString;
    }
}

csc StringManipulation.cs

StringManipulation.exe

Goodbye World