修改文件名字或者将文件移动打新的目录

static void Main(string[] args)
{
    //当前工作目录
    Console.WriteLine($"CurrentDirectory = {Environment.CurrentDirectory}");

    //原始名字
    string oldFullPath = Path.Combine(Environment.CurrentDirectory, "Test.txt");
    Console.WriteLine($"path = {oldFullPath}");

    //保持目录不变修改名字
    //string newFullPath = Path.Combine(Environment.CurrentDirectory, "NewTest.txt");

    //移动到新的目录
    var parentDir = Directory.GetParent(Environment.CurrentDirectory);
    string newFullPath = Path.Combine(parentDir.FullName, "NewTest.txt");

    FileInfo fi = new FileInfo(oldFullPath);
    fi.MoveTo(newFullPath);
    Console.ReadKey();
}