protected override Expression VisitMember(MemberExpression memberExp)
{
if (memberExp.Expression != null && memberExp.Expression.NodeType == ExpressionType.Parameter)
{
var typeName = memberExp.Expression.Type.Name;
string fieldName = GetFieldName(typeName, memberExp.Member.Name);
if (!string.IsNullOrEmpty(Alias))
{
fieldName = Alias + "." + GetFieldName(typeName, memberExp.Member.Name);
}
OrderByFields.Append(string.Format("{0} {1},", fieldName, OrderBy));
return(memberExp);
}
else if (memberExp.NodeType == ExpressionType.MemberAccess)
{
object result = Expression.Lambda(memberExp).Compile().DynamicInvoke();
var r = Expression.Constant(result, result.GetType());
this.Visit(r);
return(r);
}
throw new NotSupportedException(string.Format("成员 '{0}’不支持", memberExp.Member.Name));
}
