I can't find "Include" method with lambda expression in Entity framework?

Because string is not a delegate type, Entity Framework cannot convert lambda expressions to it.

I am using Entity Framework in my C# based code. I am running into an unexpected weirdness and am looking for suggestions....Case 1, 2, 3, 4... Projects:... RivWorks.dll... RivWorks.Service.dll... RivWorks.Alpha.dll ...Samples (all of these work):...RivWorks.Alpha.dll:...public static bool EndNegotitation(long ProductID) { var product = (from...

Lambda expression with AND operator in lambda expression

You can't use ...ToString()... in LINQ method, but you can try this:...string selectedItem = listBox1.SelectedItem.ToString(); CUSTOMER customer = db.CUSTOMERs.First(p => (p.CUSTOMERID == idValoare) && (p.ADRESA.Equals(selectedItem))); ...I hope that helps you. Please feedback.

Missing Entity Framework Include(lambda) extension

According to ...MSDN..., the method is defined in the ...EntityFramework... assembly. (in EntityFramework.dll)...You'll need to add a reference to the ...EntityFramework.dll... DLL as well....Afterwards, you'll need to make sure you're referencing the namespace:...using System.Data.Entity;

Operator '&&' cannot be applied to operands of type 'lambda expression' and 'lambda expression

You should pass single ...lambda expression... into where operator:...var relatedresourcesID = entities.NetworkInfoes .Where(a => (String.IsNullOrEmpty(ip) || a.IPADDRESS.StartsWith(ip)) && (String.IsNullOrEmpty(mac) || a.MACADDRESS.StartsWith(mac))) .Select(a => a.WORKSTATIONID); ...NOTE: You don't need to assign n...

Entity Framework recursively include collection for each entity from included collection

I have the following where I am trying to include the addresses of the people in the cities of the countries....Country country = _db.Countries .Include(p=>p.Cities.People.????) .Where(....) ...Not sure how to work it?

Entity Framework Can't Find Connection String in Web.config

Entity Framework doesn't seem to actually be reading connection strings from the Web.config....I started a new project and created a context:...public class FooContext : DbContext { public FooContext() : base("Foo") { } // DbSets here } ...Then, I added a connection string to the projects Web.config:...<configuration> <co...

How to find a List<Object> using Find method of entity framework passing Array as parameter?

You are looking for a ...Contains... query...:...var lServicosInformados = db.Servicos.Where(x => lCodigoServicos.Contains(x.PKId)); ...This assumes ...PKId... is the name of your primary id column (you didn't specify the name).

Can't build lambda Expression with unknown type of a property

Convert it to object by ...Expression conversion = Expression.Convert(propExp, typeof(object)) ...That should be ok to be returned, but then you will have to deal with these converts on the other side, where you do the Orderby.... private IQueryable<T> AddOrderBy<T>(IQueryable<T> query, Expression<Func<T, object>> orderByProperty, bool isAscendi...

Entity Framework combine lambda expressions from different entities

Provided that you have control over the design of these classes, you can implement an interface with a predicate function. ...For example:...public interface ITestable { Func<string, bool> Predicate { get; } } public class Admission : ITestable { // ...other members... public Person Person { get; } public Expression<Func<string, ...

How do I create a lambda expression using return value from another lambda expression?

You want to grab the parameter off the lambda and use the body as the expression. You aren't using it as a lambda at all - you are picking the expression tree and parameters out of the lambda.... // create // ent => exp(ent).Contains(s) public static IQueryable<T> WhereContains<T>(this IQueryable<T> qry, Expression<Func<T, string>> exp,...