C#使用占位符遍历文本文件，并用用户输入替换占位符

string filePath = "文件路径";
string fileContent = "";

using (StreamReader sr = new StreamReader(filePath))
{
    fileContent = sr.ReadToEnd();
}

Console.WriteLine("请输入用户名：");
string username = Console.ReadLine();

string replacedContent = fileContent.Replace("{username}", username);

using System;
using System.IO;

class Program
{
    static void Main()
    {
        string filePath = "文件路径";
        string fileContent = "";

        using (StreamReader sr = new StreamReader(filePath))
        {
            fileContent = sr.ReadToEnd();
        }

        Console.WriteLine("请输入用户名：");
        string username = Console.ReadLine();

        string replacedContent = fileContent.Replace("{username}", username);

        Console.WriteLine("替换后的内容：");
        Console.WriteLine(replacedContent);
    }
}