How to dispose client context (sharepoint online) in wcf?

Question

I am getting data from sharepoint online using WCF that is hosted in IIS. I decided to handle all my errors using this example. In my code I am using ClientContext class that needs to be disposed in a right way

  ClientContext _context = new ClientContext(_url);
  var list = _context.Web.Lists.GetByTitle(ListName);
  ListItem item = list.GetItemById(id);
  _context.Load(item, i => i[Description], i => i[Picture], i => i[Title], i => i.Id);
  _context.ExecuteQuery();
  _context.Dispose();

But if I get exception in _context.ExecuteQuery(); I go to HandleError method

public bool HandleError(Exception error)
{
    return true;
}

The question is: How to Dispose client context in this situation?

Answer 1

Go this way:

using(ClientContext _context = new ClientContext(_url))
{
    var list = _context.Web.Lists.GetByTitle(ListName);
    ListItem item = list.GetItemById(id);
    _context.Load(item, i => i[Description], i => i[Picture], i => i[Title], i => i.Id);
    _context.ExecuteQuery();
}

or

try
{  
  ClientContext _context = new ClientContext(_url);
  var list = _context.Web.Lists.GetByTitle(ListName);
  ListItem item = list.GetItemById(id);
  _context.Load(item, i => i[Description], i => i[Picture], i => i[Title], i => i.Id);
  _context.ExecuteQuery();
}
finally
{  
  _context.Dispose();
}