protected override Expression VisitMemberAccess(MemberExpression m)
{
ParameterExpression param = m.Expression as ParameterExpression;
if (param != null)
{
if (CurrentLocation != WhereLocationEnum.LeftOperatorClause)
{
throw new NotSupportedException("Member position not supported");
}
string fieldRefName = FieldUtility.ExtractFieldReferenceName(m.Member);
if (fieldRefName != null)
{
_builder.Append(fieldRefName);
return(m);
}
}
if (m.Member.DeclaringType == typeof(QueryConstant))
{
if (CurrentLocation != WhereLocationEnum.RightOperatorClause)
{
throw new NotSupportedException("Member position not supported");
}
_builder.Append("@" + m.Member.Name);
return(m);
}
if ((m.Member.DeclaringType == typeof(WIT.Field)) &&
(m.Member.Name == "Value"))
{
string fieldRefName;
if (LinqRegexp.TryGetFieldRefNameFromExpression(m, out fieldRefName))
{
_builder.AppendFormat("[{0}]", fieldRefName);
return(m);
}
}
throw new NotSupportedException(string.Format("The member '{0}' is not supported", m.Member.Name));
}
private void ProcessOrderClause(LambdaExpression lambda, bool isAscending)
{
if ((lambda.Parameters.Count != 1) ||
(!(lambda.Parameters[0] is ParameterExpression)) ||
(!IsAWorkItem(lambda.Parameters[0].Type)))
{
throw new InvalidOperationException("invalid order clase");
}
Expression body = lambda.Body;
MemberExpression me = body as MemberExpression;
string fieldReference = null;
if (me != null)
{
fieldReference = FieldUtility.ExtractFieldReferenceName(me.Member);
if (fieldReference == null)
{
throw new InvalidOperationException("invalid order field");
}
_builder.AddOrderClause(fieldReference, isAscending);
return;
}
MethodCallExpression mc = body as MethodCallExpression;
if (mc != null)
{
fieldReference = FieldUtility.ExtractWIFieldFromMethodCall(mc);
if (fieldReference == null)
{
throw new InvalidOperationException("invalid order field");
}
_builder.AddOrderClause(fieldReference, isAscending);
}
}