Linq Query To Fetch The Data Of Parent Table By Using List Of Child ForiegnKeyId [Resolved]

Posted by Kasani007 under LINQ on 5/4/2016 | Points: 10 | Views : 2451 | Status : [Member] | Replies : 4

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Linq Query To Fetch The Data Of Parent Table By Using List Of Child ForiegnKeyId

public class Parent
{
List<Child> childs{get;set;}
}

what i need is that

List<Parent> p=new List<Parent>();
p=p.Where(x=>x.childs.boyId==20); //this is not correct query.

pls help me..

[Resolved]

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Posted by: A2H on: 5/4/2016 [Member] [MVP] Silver | Points: 50

0	You can use the Any method to get values from inside the list like given below Please try with the below code p1 = p.Where(x => x.childs.Any(k => k.boyId == 1)).ToList(); Complete Code List<Parent> p = new List<Parent>(); List<Child> lstchild = new List<Child>(); Parent objParent = new Parent(); objParent.ParentID = 1; objParent.Name = "Test Name1"; Child chd = new Child(); chd.boyId = 1; chd.name = "ChildName1"; lstchild.Add(chd); objParent.childs = lstchild; p.Add(objParent); Parent objParent2 = new Parent(); List<Child> lstchild2 = new List<Child>(); objParent2.ParentID = 2; objParent2.Name = "Test Name2"; Child chd2 = new Child(); chd2.boyId = 2; chd2.name = "ChildName2"; lstchild2.Add(chd2); objParent2.childs = lstchild2; p.Add(objParent2); List<Parent> p1 = new List<Parent>(); p1 = p.Where(x => x.childs.Any(k => k.boyId == 1)).ToList(); Thanks, A2H My Blog Kasani007, if this helps please login to Mark As Answer. \| Alert Moderator

You can use the Any method to get values from inside the list like given below
Please try with the below code

p1 = p.Where(x => x.childs.Any(k => k.boyId == 1)).ToList();

Complete Code

 List<Parent> p = new List<Parent>();
                List<Child> lstchild = new List<Child>();
                Parent objParent = new Parent();
                objParent.ParentID = 1;
                objParent.Name = "Test Name1";
                Child chd = new Child();
                chd.boyId = 1;
                chd.name = "ChildName1";
                lstchild.Add(chd);
                objParent.childs = lstchild;
                p.Add(objParent);

                Parent objParent2 = new Parent();
                List<Child> lstchild2 = new List<Child>();
                objParent2.ParentID = 2;
                objParent2.Name = "Test Name2";
                Child chd2 = new Child();
                chd2.boyId = 2;
                chd2.name = "ChildName2";
                lstchild2.Add(chd2);
                objParent2.childs = lstchild2;
                p.Add(objParent2);

                List<Parent> p1 = new List<Parent>();

                p1 = p.Where(x => x.childs.Any(k => k.boyId == 1)).ToList();

Thanks,
A2H
My Blog

Kasani007, if this helps please login to Mark As Answer. | Alert Moderator

Posted by: A2H on: 5/4/2016 [Member] [MVP] Silver | Points: 25

0	Additional Reference : https://msdn.microsoft.com/en-us/library/bb534972(v=vs.100).aspx Thanks, A2H My Blog Kasani007, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: Kasani007 on: 5/5/2016 [Member] Starter | Points: 25

0	thanQ A2H List<int> Ids=new List<int>(); p1 = p.Where(x => x.childs.Any(k => k.boyId == Ids)).ToList(); how can i write this.. thanks in advance. Kasani007, if this helps please login to Mark As Answer. \| Alert Moderator

Posted by: A2H on: 5/5/2016 [Member] [MVP] Silver | Points: 25

0	You can use the below query p1 = p.Where(x => x.childs.Any(k => ids.Contains(k.boyId))).ToList(); Complete Code List<Parent> p = new List<Parent>(); List<Child> lstchild = new List<Child>(); Parent objParent = new Parent(); objParent.ParentID = 1; objParent.Name = "Test Name1"; Child chd = new Child(); chd.boyId = 1; chd.name = "ChildName1"; lstchild.Add(chd); objParent.childs = lstchild; p.Add(objParent); Parent objParent2 = new Parent(); List<Child> lstchild2 = new List<Child>(); objParent2.ParentID = 2; objParent2.Name = "Test Name2"; Child chd2 = new Child(); chd2.boyId = 2; chd2.name = "ChildName2"; lstchild2.Add(chd2); objParent2.childs = lstchild2; p.Add(objParent2); List<int> ids = new List<int>(); ids.Add(1); List<Parent> p1 = new List<Parent>(); p1 = p.Where(x => x.childs.Any(k => ids.Contains(k.boyId))).ToList(); Thanks, A2H My Blog Kasani007, if this helps please login to Mark As Answer. \| Alert Moderator

You can use the below query

p1 = p.Where(x => x.childs.Any(k => ids.Contains(k.boyId))).ToList();

Complete Code

List<Parent> p = new List<Parent>();

                List<Child> lstchild = new List<Child>();

                Parent objParent = new Parent();

                objParent.ParentID = 1;

                objParent.Name = "Test Name1";

                Child chd = new Child();

                chd.boyId = 1;

                chd.name = "ChildName1";

                lstchild.Add(chd);

                objParent.childs = lstchild;

                p.Add(objParent);



                Parent objParent2 = new Parent();

                List<Child> lstchild2 = new List<Child>();

                objParent2.ParentID = 2;

                objParent2.Name = "Test Name2";

                Child chd2 = new Child();

                chd2.boyId = 2;

                chd2.name = "ChildName2";

                lstchild2.Add(chd2);

                objParent2.childs = lstchild2;

                p.Add(objParent2);



                List<int> ids = new List<int>();

                ids.Add(1);



                List<Parent> p1 = new List<Parent>();



                p1 = p.Where(x => x.childs.Any(k => ids.Contains(k.boyId))).ToList();

Thanks,
A2H
My Blog

Kasani007, if this helps please login to Mark As Answer. | Alert Moderator

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