我正在尝试使用实体框架实现延迟加载。我会坦率地说,我从来没有做过并且很挣扎。因此,我尝试的所有内容都基于我在此处找到的文章。基本上我现在正在获取基础连接意外关闭的错误消息。
当我执行WCF跟踪时,如果您正在使用DataContractSerializer或将任何静态未知的类型添加到已知类型列表中,则尝试使用DataContractResolver序列化参数http://tempuri.org...Consider时出现错误。
因此,我已经研究了DataContractResolver,并且不清楚如何实现它,并且还不清楚如何使用DataContractSerializer。就像我说的那样,我是新手。
这是我当前的代码:
public OMBCase GetOMBCaseByCaseId(long caseId)
{
//using (AWCTSDBEntities context = new AWCTSDBEntities())
AWCTSDBEntities context = new AWCTSDBEntities();
//{
try
{
context.Configuration.ProxyCreationEnabled = true;
context.Configuration.LazyLoadingEnabled = true;
context.Configuration.AutoDetectChangesEnabled = false;
((IObjectContextAdapter)context).ObjectContext.CommandTimeout = 120;
context.Database.Log = s => System.Diagnostics.Debug.WriteLine(s);
var caseRecQuery = (from c in context.Cases
where (c.CaseId == caseId && c.SystemTypeCode == SystemCodes.OMB)
select c).OfType<OMBCase>();
var caseRecord = caseRecQuery.Single();
var soldierDetails = caseRecord.Soldier;
var soldierAddress = soldierDetails.Addresses.ToList();
foreach (var p in soldierDetails.Addresses)
{
var soldierAddressPurpose = p.AddressPurposes;
foreach (var ap in soldierAddressPurpose)
{
var purpose = ap;
}
}
var soldierTelehone = soldierDetails.Telephones.ToList();
var soldierEmail = soldierDetails.Emails.ToList();
var soldierContacts = soldierDetails.Contacts.ToList();
foreach (var ca in soldierDetails.Contacts)
{
var contactAddress = ca.Addresses;
foreach (var cp in contactAddress)
{
var contactAddressPurposes = cp.AddressPurposes;
}
}
foreach (var ce in soldierDetails.Contacts)
{
var contactEmails = ce.Emails;
}
foreach (var ct in soldierDetails.Contacts)
{
var contactTelephone = ct.Telephones;
}
var personInterviewed = caseRecord.PersonInterviewed;
var createdByUser = caseRecord.CreatedByUser;
context.Dispose();
return (caseRecord);
//
}
catch (NullReferenceException)
{
context.Dispose();
return (null);
}
catch (Exception e)
{
context.Dispose();
WriteToLogFile(e);
return (null);
// }
}
}
您可以提供有关从此处出发的任何指导,将不胜感激。
在此先感谢您提供的任何帮助。
罗德尼
最佳答案
在请求实际值之前,“延迟加载”不会填充您的任何类。这也意味着,当context
超出范围(或被放置)时,来自查询的对象就不好了。
看来您的程序正在执行此操作:
Logic logic logic; // Logic before getting case
var case = GetOMBCaseByCaseId(caseid);
Logic logic logic; // Logic performed on case
延迟加载最适合以下情况,即在上下文超出范围之前执行逻辑:
ProcessOMBCaseByCaseId(Int32 caseid)
{
using (AWCTSDBEntities context = new AWCTSDBEntities())
{
var caseRecQuery = (from c in context.Cases
where (c.CaseId == caseId && c.SystemTypeCode == SystemCodes.OMB)
select c).OfType<OMBCase>();
Logic logic logic; // Logic performed on case
}
}
关于c# - 延迟加载-(Entity Framework)基础连接意外关闭,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/32074250/