Add Component Id to Binary Filename

gistfile1.cs

// componentUri is a TcmUri representing the id of the binary component that you want to publish
// This snippet shows how you can add the item id to the filename.

var component = (Component)engine.GetObject(componentUri);
var filename = component.BinaryContent.Filename
extension = Path.GetExtension(filename);
filename = Path.GetFileNameWithoutExtension(filename);
filename = String.Concat(filename, "_", componentUri.ItemId.ToString(), extension);

engine.AddBinary(component.Id, null, null, component.BinaryContent.GetByteArray(), filename);