Is there an equivalent to Java's ToStringBuilder for C#? What would a good C# version feature?

In the Java world we have Apache Commons' ToStringBuilder to help with creating toString() implementations.

Does anyone know of a decent free implementation for C#? Are there better alternatives I don't know about?

If no free implementation exists than I guess this question becomes more of a question of "What would make a good ToStringBuilder in C# 3?"

Off the top of my head:

• It could offer both reflection and manual ToString string creation.

• It would be really cool if it could make use of Expression trees.

Something like this..

 public override string ToString()
   {
      return new ToStringBuilder<Foo>(this)
         .Append(t => t.Id)
         .Append(t => t.Name)
         .ToString();
   }

Which would return:

 "Foo{Id: 1, Name: AName}"

• It could use System.Reflection.Emit to precompile a ToString delegate.

Any other ideas?

UPDATE

Just to clarify ToStringBuilder is a different creature to StringBuilder.. I'm looking for something akin to the functionality of Apache Common's ToStringBuilder, it has features such as multi-line formatting, different styles and reflection base ToString creation. Thanks.

UPDATE 2

I've built my own. See here.