Question

I have a LINQ query such as:

using(csv.......)
{
    csv.Select(x => new Data() { ID = x[27], Raw = String.Join(",", x) });
}
//Do some stuff

//Now I want to use the result of the query
foreach(var item in ??)
{

}

The query returns IEnumerable within my using statement but how do I declare and then assign a variable so I can use it later on in a foreach statement?

Answer 1

The type of the query is IEnumerable<Data> which you can declare outside the using block. However, from the comments it is obvious that you cannot enumerate after myObject has been disposed. If you don’t want to pull all elements into a list before leaving the using block your only option is to do the enumeration inside the using block. Pulling data from a database requires an open connection to that database etc.

using(myObject.......) 
{ 
  var query = csv.Select(x => new Data() { ID = x[27], Raw = String.Join(",", x) }); 
  //Do some stuff 

  //Now I want to use the result of the query
  foreach (var item in query)
    ...
}