Getting Results With Entity Framework

Question

I'm trying to query a db set, but I can't seem to access the data when I get the results. Here is the code I've tried.

Query #1:

public List<CustomerMain> testing()
{
        var context = new CustomerEntities();

        var query = context.CustomerMains
            .Where(p=> p.FirstName == "Thor")
            .Select(p => new CustomerMain {FirstName=p.FirstName,LastName =p.LastName}).ToList();

        return query;
}

Query #2:

public IQueryable<CustomerMain> testing()
{
        var context = new CustomerEntities();

        var query = context.CustomerMains
            .Where(p=> p.FirstName == "Thor")
            .Select(p => new CustomerMain {FirstName=p.FirstName,LastName =p.LastName});

        return query;
}

CustomerMain is my DbSet, If I run either of those and assign the method to a var variable, it gives me no options to grab the FirstName or LastName from the variable. I found I can do it if I convert it to a CustomerMain, but shouldn't the return query be in a CustomerMain type already?

Show how you're calling the method and trying to access the properties. As a side note - here's a question on the pros/cons of returning different collection/query types from repository methods. — D Stanley
– D Stanley, Commented Jul 27, 2015 at 14:27

CodeCaster · Accepted Answer · 2015-07-27 14:29:07Z

5

it gives me no options to grab the FirstName or LastName from the variable

Because the method returns a collection or queryable, not a single entity. You need to iterate or select records:

var customers = testing();
foreach (CustomerMain customer in customers)
{
    // access customer.FirstName
}

Or:

var customers = testing();
var oneCustomer = customers.FirstOrDefault(c => c.FirstName == "Thor");
// access oneCustomer.FirstName

Or, if you want the method to return one record (or null if none found):

public CustomerMain FindOne(string firstName)
{
    using (var context = new CustomerEntities())
    {    
        var query = context.CustomerMains.Where(p => p.FirstName == firstName);

        return query.FirstOrDefault();
    }
}

edited Jul 27, 2015 at 14:29

answered Jul 27, 2015 at 14:26

CodeCaster

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