I've grabbed the Entity Framework Extended source code from nuget and I want to use it's delete expression to delete multiple rows of data using ID.
In my code I use PersonID to get ClaimsID. In two tables ClaimsID is an FK and the last table I delete from it is PK. I am doing it in this order because of key constraint.
For some reason it is giving me a null reference:
public void DeleteClaims(string _PersonID)
{
Guid PersonID = Guid.Parse(_PersonID);
try
{
using (CasaLatinaEntities CasaLatinaEntities = new CasaLatinaEntities())
{
//Delete all FKs first before deleting parent data
var tblClaims = CasaLatinaEntities.tblClaims.Where(c => c.PersonID == PersonID);
List<Guid> IDs = tblClaims.Select(c => c.ClaimID).ToList();
foreach (var ID in IDs)
{
var ClaimAction = from c in CasaLatinaEntities.tblClaimActions
where c.ClaimID == ID
select c;
var ClaimTypes = from c in CasaLatinaEntities.tblClaimTypes
where c.ClaimID == ID
select c;
if (ClaimAction.Count() > 0)
{
CasaLatinaEntities.tblClaimActions.Delete(c => c.ClaimID == ID);
CasaLatinaEntities.tblClaimTypes.Delete(c => c.ClaimID == ID);
CasaLatinaEntities.tblClaims.Delete(c => c.ClaimID == ID);
}
else if (ClaimTypes.Count() > 0)
{
CasaLatinaEntities.tblClaimTypes.Delete(c => c.ClaimID == ID);
CasaLatinaEntities.tblClaims.Delete(c => c.ClaimID == ID);
}
else
{
CasaLatinaEntities.tblClaims.Delete(c => c.ClaimID == ID);
}
}
//CasaLatinaEntities.tblClaimActions.Delete(c => c.ClaimID == ClaimId);
//CasaLatinaEntities.tblClaimTypes.Delete(c => c.ClaimID == ClaimId);
//CasaLatinaEntities.tblClaims.Delete(c => c.ClaimID == ClaimId);
}
}
catch (Exception ex)
{
}
}
Code breaks at this line
CasaLatinaEntities.tblClaimActions.Delete(c => c.ClaimID == ClaimId);
I tried annotating this code out but it breaks at every delete attempt.
Stack trace
at EntityFramework.Mapping.ReflectionMappingProvider.SetProperties(EntityMap entityMap, Object mappingFragmentProxy)
at CallSite.Target(Closure , CallSite , Type , EntityMap , Object )
at System.Dynamic.UpdateDelegates.UpdateAndExecuteVoid3[T0,T1,T2](CallSite site, T0 arg0, T1 arg1, T2 arg2)
at EntityFramework.Mapping.ReflectionMappingProvider.CreateEntityMap[TEntity](ObjectQuery query)
at EntityFramework.Mapping.ReflectionMappingProvider.GetEntityMap[TEntity](ObjectQuery query)
at EntityFramework.Mapping.MappingResolver.GetEntityMap[TEntity](ObjectQuery query)
at EntityFramework.Extensions.BatchExtensions.Delete[TEntity](IQueryable`1 source)
at EntityFramework.Extensions.BatchExtensions.Delete[TEntity](IQueryable`1 source, Expression`1 filterExpression)
at DataLayer.RepositoryClient.DeleteClaims(String _PersonID) in c:\Users\nickgowdy\Documents\Visual Studio 2012\Projects\CasaLatina\DataLayer\RepositoryClient.cs:line 876
It's not alot of code so I don't understand what the null reference is for. The rows of data exist in all three tables.