Copy file to a different directory

Question

I am working on a project where I want to copy some files in one directory to a second already existing directory.

I can\'t find a way to simply copy from one folder to

Answer 1

If the destination directory doesn't exist, File.Copy will throw. This version solves that

public void Copy(
            string sourceFilePath,
            string destinationFilePath,
            string destinationFileName = null)
{
       if (string.IsNullOrWhiteSpace(sourceFilePath))
                throw new ArgumentException("sourceFilePath cannot be null or whitespace.", nameof(sourceFilePath));
       
       if (string.IsNullOrWhiteSpace(destinationFilePath))
                throw new ArgumentException("destinationFilePath cannot be null or whitespace.", nameof(destinationFilePath));
       
       var targetDirectoryInfo = new DirectoryInfo(destinationFilePath);

       //this creates all the sub directories too
       if (!targetDirectoryInfo.Exists)
           targetDirectoryInfo.Create();

       var fileName = string.IsNullOrWhiteSpace(destinationFileName)
           ? Path.GetFileName(sourceFilePath)
           : destinationFileName;

       File.Copy(sourceFilePath, Path.Combine(destinationFilePath, fileName));
}

Tested on .NET Core 2.1