entityframework search value only to search not to update - entity-framework

Question

I build a Repository just like Codefirst demo.
public virtual IQueryable<TEntity> Get(
Expression<Func<TEntity, bool>> filter = null,
Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
string includeProperties = "")
{
IQueryable<TEntity> query = dbSet;
if (filter != null)
{
query = query.Where(filter);
}
foreach (var includeProperty in includeProperties.Split
(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
{
query = query.Include(includeProperty);
}
if (orderBy != null)
{
return orderBy(query);
}
else
{
return query;
}
}
But this search has a problem.
Sometimes other person use 'get' function to search value and this value will be used as param inside other function.
Just like this:
UserInfoBll userInfoBll = new UserInfoBll();
UserInfo userInfo = userInfoBll.Get(p => p.UserCode == "8001", null, "CorpShop").First();
ConsumeProcess.process(userInfo);
If userInfo value change in function ConsumeProcess.process when I process savechange.
It will update something I don't want to update, so I want to find a way. The search value is just for search, when value change it, not to update the value.
For this way I wrote this:
public virtual List<TEntity> GetList(Expression<Func<TEntity, bool>> filter = null,
Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
string includeProperties = "")
{
List<TEntity> tEntityList = Get(filter, orderBy, includeProperties).ToList();
SetEntityStates(EntityState.Detached, tEntityList);
return tEntityList;
}
protected void SetEntityStates(EntityState entityState, IEnumerable<TEntity> tEntity_params)
{
foreach (TEntity tEntity in tEntity_params)
{
if (tEntity != null)
{
context.Entry(tEntity).State = entityState;
}
}
}
Now it won't update, if somebody changed search value. But there is another problem.
If I use code like this, the property which is included can't get
UserInfoBll userInfoBll = new UserInfoBll();
userInfo = userInfoBll.GetList(p => p.UserCode == "8001", null, "CorpShop").First(); // CorpShop is include property
corpShop = userInfo.CorpShop; //userInfo.CorpShop is null

Answer 1

If you have an IQueryable, the easiest way to get entities disconnected from db is to use the AsNoTracking method.
public virtual List<TEntity> GetList(Expression<Func<TEntity, bool>> filter = null,
Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
string includeProperties = "")
{
return = Get(filter, orderBy, includeProperties).AsNoTracking().ToList();
}