public override string ToCode()
        {
            StringBuilder buf = new StringBuilder();

            buf.Append(getStmtPrefix());
            buf.AppendFormat("循环每一个( {0},{1} , {2} )", this.ListExp.ToCode(), ElementToken.ToCode(), IndexToken != null?("," + IndexToken.GetText()):"");
            buf.AppendLine();
            buf.Append(Body.ToString());
            return(buf.ToString());
        }