我还在斜坡上升LINQ的,但我希望有人能帮助我确定为什么我没有收到从使用PredicateBuilder(gOrderCount总是== 0),任何帮助非常下列方法的任何结果赞赏:LINQ的PredicateBuilder没有返回结果
public IQueryable<TrackingInfo> GetTrackingAllOrders(string custName, string supplier, string assigned)
{
var predicate = PredicateBuilder.False<TrackingInfo>();
if (custName != null && custName != String.Empty)
{
predicate = predicate.And(c => c.CustomerName.Contains(custName));
}
if (supplier != null && supplier != String.Empty)
{
predicate = predicate.And(c => c.Supplier.Contains(supplier));
}
if (assigned != null && assigned != String.Empty)
{
predicate = predicate.And(c => c.AssignedTo.Contains(assigned));
}
IQueryable<TrackingInfo> oList = null;
using (var ctx = new OMS_ISSEntities())
{
oList = (from c in ctx.GetSSISTrackingInfoFuction()
orderby c.OrderID descending
select new TrackingInfo
{
OrderID = c.OrderID,
CustomerName = c.CustomerName ?? String.Empty,
ClientServiceID = c.ClientServiceID ?? String.Empty,
SiteName = c.SiteName ?? String.Empty,
SiteStatus = c.SiteStatus ?? String.Empty,
IPNETWCount = c.IPNETWCount ?? 0,
VOIPCount = c.VOIPCount ?? 0,
AirCardCount = c.AirCardCount ?? 0,
TicketProductType = c.TicketProductType ?? String.Empty,
SiteAddress = c.SiteAddress ?? String.Empty,
LCONPhone = c.LCONPhone ?? String.Empty,
Supplier = c.Supplier ?? String.Empty,
SupplierOrderNumber = c.SupplierOrderNumber ?? String.Empty,
ConfFOCDate = c.ConfFOCDate,
DSLNumber = c.DSLNumber ?? String.Empty,
DSLLineType = c.DSLLineType ?? String.Empty,
JournalNote = c.JournalNote ?? String.Empty,
JournalLastUpdate = c.JournalLastUpdate,
Project = c.Project ?? String.Empty,
SiteICB = c.SiteICB,
SiteISSDueDate = c.SiteISSDueDate,
SiteISSInfo = c.SiteISSInfo ?? String.Empty,
AssignedTo = c.AssignedTo ?? String.Empty,
SiteSubmitDate = c.SiteSubmitDate,
SiteID = c.SiteID ?? String.Empty,
UserLogin = c.UserLogin ?? String.Empty,
ClientSiteType = c.ClientSiteType ?? String.Empty,
OpenJeop_Supp = c.OpenJeop_Supp,
PastDueFOC = c.PastDueFOC,
DaysSinceLastJNUpdate = c.DaysSinceLastJNUpdate,
SiteStatusID = c.SiteStatusID,
AssignedToID = c.AssignedToID,
SupplierID = c.SupplierID,
MasterCustID = c.MasterCustID,
MaxJeopSuppDate = c.MaxJeopSuppDate,
EstimatedTTU = c.Sit_EstTTU
}).ToList().AsQueryable().Where(predicate);
gOrderCount = oList.Count();
if (gOrderCount > 1500) //we limit max number of records returned to 1500
{
return null;
}
return oList.AsQueryable();
}
}
感谢这么多的反馈。通过简单地改变无功谓词= PredicateBuilder.False(); var var predicate = PredicateBuilder.True ();这开始工作。我将考虑实施一些其他建议,但再次感谢您的快速反馈。 –
2011-05-31 18:25:38