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How do I get projection of one list to another with Linq?


How do I get projection of one list to another with Linq?

By : user2173733
Date : October 20 2020, 08:10 AM
With these it helps There are two classes: , Use the Select clause for projection:
code :
List<PhoneList> phoneList = personList.Select(x => new Phones { Name = x.Name, Phone = x.Phone }).ToList();


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LINQ to Entities projection of nested list

LINQ to Entities projection of nested list


By : user2024822
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Assuming these objects... , You don't. You have to do this part in L2O.
So you could do:
code :
var q = (from MyClassTable mct in this.Context.MyClassTableSet
         select new // note anonymous type; important!
         {
             ID = mct.ID,
             Name = mct.Name,
             Things = (from MyOtherClass moc in mct.Stuff
                       where moc.IsActive
                       select new MyOtherClass
                       {
                           ID = moc.ID,
                           Value = moc.Value
                       }
          }).AsEnumerable();

MyClass myClass = (from mct in q
                   select new MyClass
                   {                 
                       ID = mct.ID,
                       Name = mct.Name,
                       Things = mct.Things.ToList()
                   }).FirstOrDefault();
Linq projection nested LIST<T> property

Linq projection nested LIST<T> property


By : Nick F.
Date : March 29 2020, 07:55 AM
wish of those help This query has taken a couple days but I am almost there. I have hacked my way through LINQ to entities to come up with the following from reading a lot of tutorials. However this last part I am missing. , You don't need to select twice. I think this does the same thing.
code :
var query = _mlsDashboardNavRepository.Table
    .OrderBy(x => x.Id)
    .Select(x => new MLS_DashboardNavigation()
    {
        Id = x.Id,
        Name = x.Name,
        Description = x.Description,
        ImageUrl = x.ImageUrl,
        SubDashNav = _mlsSubDashNav.Table
            .Where(s => s.DashId == x.Id).ToList()
    }).ToList();
var query = _mlsDashboardNavRepository.Table
    .OrderBy(x => x.Id)
    .Select(x => new MLS_DashboardNavigation()
    {
        Id = x.Id,
        Name = x.Name,
        Description = x.Description,
        ImageUrl = x.ImageUrl,
        SubDashNav = x.SubDashNav
    }).ToList();
var query = _mlsDashboardNavRepository.Table
    .OrderBy(x => x.Id).ToList()
Get list of properties in LINQ projection

Get list of properties in LINQ projection


By : Pradeep Sheoran
Date : March 29 2020, 07:55 AM
I wish this helpful for you You can easily do that using an ExpressionVisitor. Just create a new class and override the visiting methods. If you know that the projection was done using member bindings, you can simply override the method VisitMemberBinding and add the bound member to a list that you store as an instance variable. Then all you need to do is to make that instance variable public.
code :
class ProjectionAnalyzer : ExpressionVisitor
{
    private HashSet<MemberInfo> boundMembers = new HashSet<MemberInfo>();

    protected override MemberBinding VisitMemberBinding(MemberBinding node)
    {
        boundMembers.Add(node.Member);
        return base.VisitMemberBinding(node);
    }

    public IEnumerable<MemberInfo> BoundMembers => boundMembers;
}
var analyzer = new ProjectionAnalyzer();
analyzer.Visit(selectorPredicate);
var boundMembers = analyzer.BoundMembers;
Dynamic Projection in linq with List of fieldNames

Dynamic Projection in linq with List of fieldNames


By : James Witcher
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You can't do it with System.Linq.Dynamic. It is possible with System.Linq.Dynamic.Core (a more advanced fork of the library).
Equivalent to the query you wrote in non-dynamic way:
code :
var q = Students.Select("new (Name, Category.Name as Category, Courses.Select(new (Name, UnitName)) as Courses)");
Linq Group by With projection into a list

Linq Group by With projection into a list


By : André Matias
Date : March 29 2020, 07:55 AM
this will help I'm trying to group by an object and project it into a list in such a way that each element of a list property generates a projected object in this new list. , You should change a bit the logic of the .Select over the group:
code :
var result = nonEuTranslationRequests
            .GroupBy(i => i.TranslationSource.Language)
            .Select(g => g.SelectMany(r => r.TargetLanguages).Select(i => new {
                g.Key.Language,
                TargetLanguage = i
            })
            .ToList();
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