FileInfo 找到文件，但 File.Copy 找不到该文件

我正在尝试查找具有上次写入日期的文件并将其复制到其他位置。它正确找到了文件，但是当我尝试复制它时，它找不到刚刚找到的文件。这是在 SSIS 脚本任务中。

DirectoryInfo directory = new DirectoryInfo(@"path");
FileInfo[] files = directory.GetFiles();
//files that have been written to in the last 3 days
DateTime lastWrite = DateTime.Now.AddDays(-3); 
foreach (FileInfo latestFile in files)
{  
    // if its the correct name
    if (latestFile.Name.StartsWith("OMC")) 
    {
        // if its in the last 3 days
        if (latestFile.LastWriteTime > lastWrite) 
        {    
            lastWrite = latestFile.LastWriteTime;
            // this correctly find the file and puts it into the file variable.
            file = latestFile.ToString(); 
            // this errors out saying it cannot find the file.
            // (Does not even go to the outputFile)
            File.Copy(file, outputFile, true); // <- error
            //backs the file up 
            File.Copy(file, backupfile, true);
        }
    }   
}