c# – How to use IN clause in Lambda?

Question:

A doubt arose that I thought would be easy, but the content I found I couldn't understand.

Good is the following: I have the tables

"Client"

and

"ErrorsProduction_Customer"

where they are related in a 1 to N way, that is, 1 error can affect N Customers.

So I need to do in lambda exactly the SQL query below:

select * from Cliente 
where Id_Cliente in (select CodCliente 
                     from ErrosProducao_Cliente 
                     where codErro = 1)

I know I can solve this problem with a Join , but I would like to find out how it is done using IN.

Unlike the question mentioned below in the answer, my problem wanted to perform the IN directly through a subSelect .

Answer:

Do something like this.

using (var ctx = new stackoverflowEntities())
{

    var qrInSubCategoria = ctx.Cliente
        .Where(C => ctx.ErrosProducao_Cliente.Any(EC => EC.CodCliente== C.CodCliente && C.codErro == 1));
}

Or

using (var ctx = new stackoverflowEntities())
{
    var listint = ctx.ErrosProducao_Cliente
        .Where(EC => EC.codErro == 1)
        .Select(EC => EC.CodCliente)
        .ToList();

    var qrInSubCategoria = ctx.Cliente
        .Where(C => listint.Contains(C.CodCliente));

}

Or even using .Distinct() in your client code.

using (var ctx = new stackoverflowEntities())
{
    var listint = ctx.ErrosProducao_Cliente
        .Where(EC => EC.codErro == 1)
        .Select(EC => EC.CodCliente)
        .Distinct()
        .ToList();

    var qrInSubCategoria = ctx.Cliente
        .Where(C => listint.Contains(C.CodCliente));

}