在主字符串中插入基于映射关键字的字符串关键字值

using System;
using System.Collections.Generic;

public class Program
{
    public static void Main()
    {
        string mainString = "This is a [name] and it is [age] years old.";
        Dictionary<string, string> keywordMap = new Dictionary<string, string>();
        keywordMap.Add("[name]", "John");
        keywordMap.Add("[age]", "25");

        string result = InsertKeywords(mainString, keywordMap);
        Console.WriteLine(result);
    }

    public static string InsertKeywords(string mainString, Dictionary<string, string> keywordMap)
    {
        foreach (var entry in keywordMap)
        {
            string keyword = entry.Key;
            string value = entry.Value;

            int index = mainString.IndexOf(keyword);
            while (index != -1)
            {
                mainString = mainString.Insert(index, value);
                index = mainString.IndexOf(keyword, index + value.Length);
            }
        }

        return mainString;
    }
}