C# EntityFramework DBContext审核中出错
我的目标是同时创建保存和审核日志。当在实体条目状态改变后运行应用程序var result=base.SaveChnages()时,如何克服这个问题,任何人都可以帮助解决C# EntityFramework DBContext审核中出错,c#,entity-framework-5,C#,Entity Framework 5,我的目标是同时创建保存和审核日志。当在实体条目状态改变后运行应用程序var result=base.SaveChnages()时,如何克服这个问题,任何人都可以帮助解决 public override int SaveChanges() { ChangeTracker.DetectChanges(); using (var scope = new TransactionScope()) { var obje
public override int SaveChanges()
{
ChangeTracker.DetectChanges();
using (var scope = new TransactionScope())
{
var objectStateManager = ((IObjectContextAdapter) this).ObjectContext.ObjectStateManager;
var modifiedAuditableEntities =
objectStateManager.GetObjectStateEntries(EntityState.Modified | EntityState.Added).Where(
e => (IAuditable) e.Entity != null);
var result = base.SaveChanges();
foreach (var entry in modifiedAuditableEntities)
{
var entity = (IAuditable) entry.Entity;
if (entity != null)
{
switch (entry.State)
{
case EntityState.Added:
entity.IsAdded = true;
break;
case EntityState.Deleted:
entity.IsDeleted = true;
break;
case EntityState.Modified:
entity.IsModified = true;
break;
}
this.EntitySet<AuditLogEntry>().Add(
this.auditLogService.CreateAuditLogEntryForEntity((IAuditable) entry.Entity));
}
}
base.SaveChanges();
scope.Complete();
return result;
}
}
public override int SaveChanges()
{
ChangeTracker.DetectChanges();
使用(var scope=new TransactionScope())
{
var objectStateManager=((IObjectContextAdapter)this).ObjectContext.objectStateManager;
var modifiedAuditableEntities=
objectStateManager.GetObjectStateEntries(EntityState.Modified | EntityState.Added)。其中(
e=>(IAuditable)e.实体!=null);
var result=base.SaveChanges();
foreach(modifiedAuditableEntities中的var条目)
{
var entity=(IAuditable)entry.entity;
如果(实体!=null)
{
开关(进入状态)
{
案例实体状态。添加:
entity.IsAdded=true;
打破
案例实体状态。已删除:
entity.IsDeleted=true;
打破
案例实体状态。已修改:
entity.IsModified=true;
打破
}
this.EntitySet().Add(
this.auditLogService.CreateAuditLogEntryForEntity((IAuditable)entry.Entity));
}
}
base.SaveChanges();
scope.Complete();
返回结果;
}
}
重写“OnContextCreated”方法并绑定“SaveChanges”事件处理程序,如下所示:
public partial class MyDataModel
{
partial void OnContextCreated()
{
this.SavingChanges += new EventHandler(CreateAuditLog);
}
void CreateAuditLog(object sender, EventArgs e)
{
var changes = this.ObjectStateManager.GetObjectStateEntries(EntityState.Deleted | EntityState.Modified);
if (!changes.Any())
return;
var auditDataList = new List<AuditLogEntry>();
foreach (ObjectStateEntry stateEntryEntity in changes)
{
if (!stateEntryEntity.IsRelationship && stateEntryEntity.Entity != null && !(stateEntryEntity.Entity is AuditLogEntry))
{
var audit = new AuditLogEntry();
auditDataList.Add(audit);
}
}
if (auditDataList.Count > 0)
{
foreach (var audit in auditDataList)
this.AddToAuditLogEntries(audit);
}
}
}
公共部分类MyDataModel
{
部分无效OnContextCreated()
{
this.SavingChanges+=新的事件处理程序(CreateAuditLog);
}
void CreateAuditLog(对象发送方,事件参数e)
{
var changes=this.ObjectStateManager.GetObjectStateEntries(EntityState.Deleted | EntityState.Modified);
如果(!changes.Any())
返回;
var auditDataList=新列表();
foreach(更改中的ObjectStateEntry StatentryEntity)
{
如果(!statentryEntity.IsRelationship&&statentryEntity.Entity!=null&&!(statentryEntity.Entity是AuditLogEntry))
{
var audit=新的AuditLogEntry();
auditDataList.Add(审计);
}
}
如果(auditDataList.Count>0)
{
foreach(auditDataList中的var审计)
本附录添加至审计(审计);
}
}
}