Entity Framework with NOLOCK

No, not really - Entity Framework is basically a fairly strict layer above your actual database. Your queries are formulated in ESQL - Entity SQL - which is first of all targeted towards your entity model, and since EF supports multiple database backends, you can't really send "native" SQL directly to your backend.

The NOLOCK query hint is a SQL Server specific thing and won't work on any of the other supported databases (unless they've also implemented the same hint - which I strongly doubt).

Marc

Necro-ing this thread because it is the first that comes up in a google search. There have been changes to how EF structures its queries. This regex will also cover joins.

as an aside, transaction level read uncommitted works (examples are above with transactionscope), however it will still block updates. Using the table level nolock will allow for updates to continue. Be very aware and do some research on the effects of using dirty reads before doing this

(?<tableAlias>((FROM)|(JOIN))\s\[([^\s]+)\]\sAS\s\[([^\s]+)\](?!\sWITH\s\(NOLOCK\)))

you can test it with any regex online tester (like regex101.com) with this sample

FROM [table1] AS [t]
INNER JOIN [table2] AS [t2] ON ([t].[ID] = [t2].[ID])
INNER JOIN [table3] AS [t3] WITH (NOLOCK) ON ([t].[ID] = [t3].[ID])

I also cleaned up the example but left out the bool flag for trigger. feel free to add if you want

public class NoLockInterceptor : DbCommandInterceptor
    {       

        public override InterceptionResult<DbDataReader> ReaderExecuting(DbCommand command, CommandEventData eventData, InterceptionResult<DbDataReader> result)
        {           
            
            var finishedresult = base.ReaderExecuting(command.NoLockCommand(), eventData, result);    
            return finishedresult;  
        }

        public override ValueTask<InterceptionResult<DbDataReader>> ReaderExecutingAsync(DbCommand command, CommandEventData eventData, InterceptionResult<DbDataReader> result, CancellationToken cancellationToken = default)
        {
            
            var finishedresult = base.ReaderExecutingAsync(command.NoLockCommand(), eventData, result, cancellationToken);
            return finishedresult; 
        }

        public override InterceptionResult<object> ScalarExecuting(DbCommand command, CommandEventData eventData, InterceptionResult<object> result)
        {
            var finishedresult = base.ScalarExecuting(command.NoLockCommand(), eventData, result);
            return finishedresult;
        }

        public override ValueTask<InterceptionResult<object>> ScalarExecutingAsync(DbCommand command, CommandEventData eventData, InterceptionResult<object> result, CancellationToken cancellationToken = default)
        {
            var finishedresult = base.ScalarExecutingAsync(command.NoLockCommand(), eventData, result, cancellationToken);
            return finishedresult;
        }

        
    } 

    public static class DbCommandExtensions
    {
        private static Regex _tableAliasRegex = new Regex(@"(?<tableAlias>((FROM)|(JOIN))\s\[([^\s]+)\]\sAS\s\[([^\s]+)\](?!\sWITH\s\(NOLOCK\)))",
                RegexOptions.Multiline | RegexOptions.IgnoreCase);

        public static DbCommand NoLockCommand(this DbCommand command)        {          

            string updatedCommandText = _tableAliasRegex.Replace(command.CommandText, "${tableAlias} WITH (NOLOCK)");

            command.CommandText = updatedCommandText;
            return command;
        }
    }