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how to grab a list of id's from a var

Posted on 2014-10-30
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Last Modified: 2014-10-31
I'm trying to grab all the values from one var and populate another var where the first vars Id's exist.

I just can't figure out the syntax. I want to populate ok with all the od.id's that exist. I just don't know how to write it.

 
             
   var o = dc.vw_AdminDate.OrderByDescending(a => a.Date);
                foreach (var i in o)
                {
                    var od = dc.vw_AdminDetails.Where(a => a.Date.Equals(i.Date)).ToList();
                    var ok = dc.Comments.Where(a => a.Id.Equals(od.Id)).ToList();
                       

                    allOrder.Add(new VM_Request("p") { order = i, orderDetails = od, orderComments = ok });
                    
                }

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Question by:NickMalloy
  • 6
  • 4
10 Comments
 
LVL 33

Expert Comment

by:it_saige
ID: 40414316
First var is nothing more than a keyword used to imply the type declaration of a given object.

//This line (implicit type declaration)
var i = new List<string>();
// Is the same as this line (explicit type declaration)
List<string> i = new List<string>();

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So then the question is actually what are you implying that o and i are.

o looks like it would be a collection of vw_AdminDate, since you are using OrderByDescending(), which returns an Enumerable, this would be an Enumerable<vw_AdminDate>.  So i, then, represents a single vw_AdminDate object.

If this is the case and you want to populate a second enumerable with all elements from o as i that exist in od, you would simply use this:
var ok = (from adminDate in dc.vw_AdminDate
	  from adminDetails in dc.vw_AdminDetails
	  where adminDate.ID.Equals(adminDetails.ID)
	  select adminDetails).OrderByDescending(a => a.Date)

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This is all assuming though, that vw_AdminDate and vw_AdminDetails are Enumerable collections themselves.

-saige-
0
 
LVL 33

Expert Comment

by:it_saige
ID: 40414338
Looking at it more you might actually be looking for this:
var ok = (from adminDate in dc.vw_AdminDate
	  from adminDetails in dc.vw_AdminDetails
	  from comment in dc.Comments
	  where comment.ID.Equals(adminDate.ID) && adminDetails.Date.Equals(adminDate.Date)
	  select new 
	  {
	  	Order = adminDate,
		OderDetails = adminDetails,
		Comments = comment
	  })

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This is also assuming a one-to-one relationship between the adminDate, adminDetails and comments.

-saige-
0
 

Author Comment

by:NickMalloy
ID: 40414361
I'm actually trying to create a 3 level nested Web Grid. The first level is populated by the var i. It is simply a list of dates.
The send level is individual records from that date. They are in the table vw_AdminDetails. I use the loop to populate. I want to add a third level to this. There is a table called Comments. It contains comments for records stored in the details view. So that is my third nested web grid. So I need the date, then the records, and any comments that pertain to that record. That's where the orderComments = ok in the allOrder.Add(new VM_Request("p") { order = i, orderDetails = od, orderComments = ok });

           
    var o = dc.vw_AdminDate.OrderByDescending(a => a.Date);
                foreach (var i in o)
                {
                    var od = dc.vw_AdminDetails.Where(a => a.Date.Equals(i.Date)).ToList();
                    allOrder.Add(new VM_Request("p") { order = i, orderDetails = od});
                }

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LVL 33

Expert Comment

by:it_saige
ID: 40414369
So If I am understanding you, the first level is a list of dates.  For each date, you can have multiple details.  Does each detail have a single comment or multiple comments?  Can each comment be applid to multiple details or just a single detail?

-saige-
0
 

Author Comment

by:NickMalloy
ID: 40414377
each detail could have none or multiple comments.
0
 
LVL 33

Expert Comment

by:it_saige
ID: 40414388
I don't know if you saw the follow-up question, but can each comment be applied to multiple details or just a single detail?

-saige-
0
 

Author Comment

by:NickMalloy
ID: 40414394
Each comment is attached to one detail. But there can be multiple comments to one detail or none.
0
 
LVL 33

Expert Comment

by:it_saige
ID: 40414540
Ok, here is a quick example I threw together.  Let me know if this is the output you are generally looking for:
using System;
using System.Collections.Generic;
using System.Linq;

public class Program
{
	public static void Main()
	{
		List<Order> Orders = new List<Order>()
		{
			new Order() { ID = 1, Date = Convert.ToDateTime("01/01/2014") },
			new Order() { ID = 2, Date = Convert.ToDateTime("02/01/2014") },
			new Order() { ID = 3, Date = Convert.ToDateTime("03/01/2014") },
			new Order() { ID = 4, Date = Convert.ToDateTime("04/01/2014") },
			new Order() { ID = 5, Date = Convert.ToDateTime("05/01/2014") }
		};

		List<Detail> Details = new List<Detail>()
		{
			new Detail() { ID = 1, Date = Convert.ToDateTime("01/01/2014"), Description = "Order number 1 for 01/01/2014" },
			new Detail() { ID = 2, Date = Convert.ToDateTime("01/01/2014"), Description = "Order number 2 for 01/01/2014" },
			new Detail() { ID = 3, Date = Convert.ToDateTime("01/01/2014"), Description = "Order number 3 for 01/01/2014" },
			new Detail() { ID = 4, Date = Convert.ToDateTime("02/01/2014"), Description = "Order number 1 for 02/01/2014" },
			new Detail() { ID = 5, Date = Convert.ToDateTime("02/01/2014"), Description = "Order number 2 for 02/01/2014" },
			new Detail() { ID = 6, Date = Convert.ToDateTime("02/01/2014"), Description = "Order number 3 for 02/01/2014" },
			new Detail() { ID = 7, Date = Convert.ToDateTime("03/01/2014"), Description = "Order number 1 for 03/01/2014" },
			new Detail() { ID = 8, Date = Convert.ToDateTime("03/01/2014"), Description = "Order number 2 for 03/01/2014" },
			new Detail() { ID = 9, Date = Convert.ToDateTime("04/01/2014"), Description = "Order number 1 for 04/01/2014" },
			new Detail() { ID = 10, Date = Convert.ToDateTime("04/01/2014"), Description = "Order number 2 for 04/01/2014" },
			new Detail() { ID = 11, Date = Convert.ToDateTime("04/01/2014"), Description = "Order number 3 for 04/01/2014" },
			new Detail() { ID = 12, Date = Convert.ToDateTime("04/01/2014"), Description = "Order number 4 for 04/01/2014" },
			new Detail() { ID = 13, Date = Convert.ToDateTime("05/01/2014"), Description = "Order number 1 for 05/01/2014" }
		};

		List<Comment> Comments = new List<Comment>()
		{
			new Comment() { ID = 1, DetailID = 1, Description = "Comment 1" },
			new Comment() { ID = 2, DetailID = 1, Description = "Comment 2" },
			new Comment() { ID = 3, DetailID = 1, Description = "Comment 3" },
			new Comment() { ID = 4, DetailID = 3, Description = "Comment 1" },
			new Comment() { ID = 5, DetailID = 3, Description = "Comment 2" },
			new Comment() { ID = 6, DetailID = 4, Description = "Comment 1" },
			new Comment() { ID = 7, DetailID = 5, Description = "Comment 1" },
			new Comment() { ID = 8, DetailID = 6, Description = "Comment 1" },
			new Comment() { ID = 9, DetailID = 7, Description = "Comment 1" },
			new Comment() { ID = 10, DetailID = 13, Description = "Comment 1" },
			new Comment() { ID = 11, DetailID = 13, Description = "Comment 2" },
			new Comment() { ID = 12, DetailID = 13, Description = "Comment 3" },
			new Comment() { ID = 13, DetailID = 14, Description = "Comment 4" }
		};

		var matches = (from order in Orders
					from detail in Details.Where(x => x.Date.Equals(order.Date)).DefaultIfEmpty()
					join comment in Comments on detail.ID equals comment.DetailID into grp
					select new
					{
						OrderDate = order.Date,
						Details = detail.Description,
						Comments = grp
					});
		foreach(var match in matches)
		{
			Console.WriteLine(string.Format("Order Date: {0}; Details - {1}", match.OrderDate.ToShortDateString(), match.Details));
			if (match.Comments.Count() == 0)
				Console.WriteLine(string.Format("No comments for - {0}", match.Details));
			else
			{
				foreach (var comment in match.Comments)
					Console.WriteLine(comment != null ? string.Format("Comment for {0} - {1}", match.Details, comment.Description));
			}
			Console.WriteLine();
		}
		Console.ReadLine();
	}
}

public class Order
{
	public int ID { get; set; }
	public DateTime Date { get; set; }
}

public class Detail
{
	public int ID { get; set; }
	public DateTime Date { get; set; }
	public string Description { get; set; }
}

public class Comment
{
	public int ID { get; set; }
	public int DetailID { get; set; }
	public string Description { get; set; }
}

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Produces the following output:Capture.JPG
-saige-
0
 

Author Comment

by:NickMalloy
ID: 40414573
That's the way I need it. I just don't know how to get it to work with 3 nested WebGrids in MVC.
0
 
LVL 33

Accepted Solution

by:
it_saige earned 500 total points
ID: 40414664
Well the real magic for the above example happens here:
var matches = (from order in Orders
		from detail in Details.Where(x => x.Date.Equals(order.Date)).DefaultIfEmpty()
		join comment in Comments on detail.ID equals comment.DetailID into grp
		select new
		{
			OrderDate = order.Date,
			Details = detail.Description,
			Comments = grp
		});

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So modifying it for your use would be:
var matches = (from invoice in dc.vw_AdminDate
		from detail in dc.vw_AdminDetails.Where(x => x.Date.Equals(invoice.Date)).DefaultIfEmpty()
		join comment in dc.Comments on detail.Id equals comment.Id into comments
		select new
		{
			Order = invoice,
			Detail = detail,
			Comments = comments
		});

foreach (var match in matches)
	allOrder.Add(new VM_Request("p") { order = match.Order, orderDetails = match.Detail, orderComments = match.Comments });

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-saige-
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