protected override Expression VisitMember(MemberExpression m)
{
var param = m.Expression as ParameterExpression;
if (IsInNotBlock)
{
throw new NotSupportedException("Not statement not supported");
}
if (param != null && param.Name == _parameterName)
{
if (_resolver == null)
{
throw new NotSupportedException("Cannont resolve field");
}
var field = _resolver.Resolve(m.Member);
if (field == null)
{
throw new NotSupportedException("Non-mapped field not supported");
}
_statement = new FieldStatement(field.Name, _origin);
return(m);
}
if (m.Member.DeclaringType == typeof(QueryConstant))
{
if (CurrentLocation != WhereLocation.RightOperatorClause)
{
throw new NotSupportedException("Member position not supported");
}
_statement = new ParameterValueStatement(m.Member.Name);
return(m);
}
throw new NotSupportedException($"The member '{m.Member.Name}' is not supported");
}
/// <summary>
/// Processes the order clause.
/// </summary>
/// <param name="lambda">The lambda.</param>
/// <param name="isAscending">if set to <c>true</c> [is ascending].</param>
private void ProcessOrderClause(LambdaExpression lambda, bool isAscending)
{
if (lambda.Parameters.Count == 0)
{
throw new InvalidOperationException("invalid order clase");
}
if (lambda.Parameters.Count != 1 ||
!IsAWorkItem(lambda.Parameters[0].Type))
{
throw new InvalidOperationException("invalid order clase");
}
var body = lambda.Body;
var me = body as MemberExpression;
if (me != null)
{
var fieldInfo = _resolver.Resolve(me.Member);
if (fieldInfo == null)
{
throw new InvalidOperationException("invalid order field");
}
_builder.AddOrderClause(fieldInfo.Name, isAscending);
return;
}
var mc = body as MethodCallExpression;
if (mc != null)
{
var fieldInfo = _resolver.Resolve(lambda.Parameters[0].Name, mc);
if (fieldInfo == null)
{
throw new InvalidOperationException("invalid order field");
}
_builder.AddOrderClause(fieldInfo.Name, isAscending);
}
}