Get string property name from expression

Question

I\'m trying to write a strongly typed helper which would be something like this:

Html.Lookup(x => x.FooId);

for now I have this:

Answer 1

Currently using this class when I need this functionality outside of web project where System.Web.Mvc reference shouldn't exist:

namespace Interreg.Domain{
  using System;
  using System.Linq.Expressions;
  public class PropertyName{
    public static string For(
      Expression> expression){
      var body=expression.Body;
      return GetMemberName(body);
    }
    public static string For(
      Expression> expression){
      var body=expression.Body;
      return GetMemberName(body);
    }
    public static string GetMemberName(
      Expression expression){
      if(expression is MemberExpression){
        var memberExpression=(MemberExpression)expression;
        if(memberExpression.Expression.NodeType==
           ExpressionType.MemberAccess)
          return GetMemberName(memberExpression.Expression)+"."+memberExpression.Member.Name;
        return memberExpression.Member.Name;
      }
      if(expression is UnaryExpression){
        var unaryExpression=(UnaryExpression)expression;
        if(unaryExpression.NodeType!=ExpressionType.Convert)
          throw new Exception(string.Format("Cannot interpret member from {0}",expression));
        return GetMemberName(unaryExpression.Operand);
      }
      throw new Exception(string.Format("Could not determine member from {0}",expression));
    }
  }
}

Good thing about this one is - it does not lose dots when going deeper than just one level.