/// <summary>
/// Attachs files to <see cref="IUpload.Files"/> property of an <see cref="IUpload"/> object;
/// </summary>
/// <param name="target">The object, that files are being attached to.</param>
/// <param name="files">The files to be attached to <see cref="IUpload.Files"/> property on the <paramref name="target"/> object.</param>
public static void AttachFilesToRequestObject(IUpload target, IList <IFile> files)
{
EnsureArg.IsNotNull(target, nameof(target));
EnsureArg.IsNotNull(files, nameof(files));
EnsureArg.HasItems(files, optsFn: options => options.WithMessage("File collection is empty."));
var targetTypeInfo = target.GetType().GetTypeInfo();
var filesPropertyInfo = targetTypeInfo.GetProperty(nameof(IUpload.Files));
filesPropertyInfo.SetValue(target, new ReadOnlyCollection <IFile>(files));
}