vs c# 控制台 写一个压缩解压工具出现文件占用的问题

想用c#控制台写一个压缩解压小工具，直接用的System.IO.Compression库，然后在压缩这步出现了这个错误，明明我没有打开这个文件，但还是显示占用

 internal class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("选择功能：1.解压 ；2.压缩  ");
            FileHandle fileHandle = new FileHandle();
            ConsoleKey Key=Console.ReadKey().Key;
            if (Key == ConsoleKey.NumPad1)
            {
                Console.WriteLine();
                if (Console.ReadKey(true).Key == ConsoleKey.Enter)
                {
                    Console.WriteLine("\n"+"输入完整文件路径：");
                    string fullPath = Console.ReadLine();
                    fileHandle.FileToZip(fullPath);
                }
            }
            else if(Console.ReadKey(true).Key == ConsoleKey.NumPad2)
            {
                Console.ReadKey();
                if (Console.ReadKey(true).Key == ConsoleKey.Enter)
                {
                    Console.WriteLine("\n" + "输入完整文件路径：");
                    string fullPath = Console.ReadLine();
                    fileHandle.ZipToFile(fullPath);
                }
            }
        }
    }

    class FileHandle
    {
        public void FileToZip(string filepath)
        {
            string sourcePath = Path.GetDirectoryName(filepath);
            //var stream =new FileStream(filepath,FileMode.Open,FileAccess.Read);
            ZipFile.CreateFromDirectory(sourcePath, filepath+".zip");
        }
    }

错误是The process cannot access the file 'C:\MSI\1.txt.zip.zip' because it is being used by another process