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Get Entity Framework 6 use NOLOCK in its underneath SELECT statements

First of all... You should NEVER EVER use NOLOCK for each and every SQL Statement. It could compromise the integrity of your data.
It’s like any other query hint a mechanism you should only use when you do something out of the ordinary.
There is no way to tell the EF Provider to render the NoLock hint. If you really need to read uncommitted data you have the following option.
  1. Write your own EntityFramework Provider.
  2. Use a Command Interceptor to modify the statement before it is executed. http://msdn.microsoft.com/en-us/data/dn469464.aspx
  3. Use a TransactionScope with IsolationLevel.ReadUncommited.
I know you said you do not want to use Transactions but it's the only out-of-the box way to read uncommitted data. Also it does not produce much overhead as each statement in SQL Server “implicitly” runs in a transaction.
using (new TransactionScope(
                    TransactionScopeOption.Required, 
                    new TransactionOptions 
                    { 
                         IsolationLevel = IsolationLevel.ReadUncommitted 
                    })) 
{
        using (var db = new MyDbContext()) { 
            // query
        }
}


Ref : https://stackoverflow.com/questions/24684914/get-entity-framework-6-use-nolock-in-its-underneath-select-statements

Comments

  1. SVOctober 17, 2017 at 11:45 PM

    public static IList ToListNolock(this IQueryable query)
    {
    using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required, new TransactionOptions() { IsolationLevel = IsolationLevel.ReadUncommitted }))
    {
    IList toReturn = query.ToList();
    scope.Complete();
    return toReturn;
    }
    }

    ReplyDelete
  2. SVOctober 17, 2017 at 11:45 PM

    private static TransactionScope _TransactionScope { get { return new TransactionScope(TransactionScopeOption.Required, new TransactionOptions() { IsolationLevel = IsolationLevel.ReadUncommitted }); } }

    public static List ToListNolock(this IEnumerable query)
    {
    using (_TransactionScope) { return Enumerable.ToList(query); }
    }

    public static T FirstOrDefaultNolock(this IEnumerable query)
    {
    using (_TransactionScope) { return Enumerable.FirstOrDefault(query); }
    }

    ReplyDelete

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