FTP上传时检查文件是否存在,是否在C#中重命名

string filePath = "example.txt";
if (File.Exists(filePath))
{
    Console.WriteLine("文件存在");
}
else
{
    Console.WriteLine("文件不存在");
}

string oldFilePath = "example.txt";
string newFilePath = "example_new.txt";
File.Move(oldFilePath, newFilePath);

string oldFilePath = "example.txt";
string newFilePath = "example_new.txt";
File.Replace(oldFilePath, newFilePath, null);