Question

Following is the case for which I intend to write my LINQ query, but it does not work:

List <Clients> has client info and in this list there is List<JobCards>, which represents the list of job cards of that person. The job card list has one attribute named Status. I need to return all the active job cards in all Clients List.

Can it be done in LINQ?

Other code may be as follows:

BindingList<JobCard> activeJobs = new List<JobCards>();
foreach(var client in allClientList)
{
    foreach(var jobCard in client.JobCards)
    {
        if (jobCard.Status == "Active") 
        {
            activeJobs.Add(jobCard);
        }
    }
}

I am in the learning phase of LINQ. I am certain there is some error in what I’ve implemented, but I’m not sure how to fix it. Here is my LINQ query:

activeJobCards = new BindingList<JobCard>(
    mainForm.allData.Where(
        index => index.JobCards.Where(
            card => card.Status == "active"
        ).ToList().Count > 0
    ).ToList()
);

Answer 1

What you are looking for is SelectMany

allClientList.SelectMany(c => c.JobCards).Where(jc => jc.Status == "Active");

SelectMany() will give you an IEnumerable<JobCard> and from there you select the Active job cards.