I am learning Linq, so bear with me. I have a class object that holds 4 other class objects with each holding a List(Of T) of the next. Think tiered classes. As these lists as built I need to search all the Group2 for all Group3 to see which Group3.units.count is the largest. "units" being a List(Of T). [code]
View 4 RepliesI have a table with the below structure.
ID VALUE
1 3.2
2 NULL
4 NULL
5 NULL
7 NULL
10 1.8
11 NULL
12 3.2
15 4.7
17 NULL
22 NULL
24 NULL
25 NULL
27 NULL
28 7
I would like to get the max count of consecutive null values in the table.
I have a class having 2 properties (both integers) and storing class into List collection.[code]Here I need return "TRUE". (values in "GroupNo" is not static and not in sort).How can we do that in vb.net?
View 2 Replieshave a class having 2 properties (both integers) and storing class into List collection.
Public Class GroupSelect
Public Property RowNo() As Integer
Get
[Code].....
Here I need return "TRUE". (values in "GroupNo" are not static and not in sort).
For a class project I am supposed to search through the attached file, and write to a new file the years between 1789 and 2009 that are not present in the fifth field. What is my best bet for determining what years are not present?
[Code]...
Should I make an array of integer between 1789 and 2009, then search for every year in the file, then set a flag to false if not found; is there a simpler way to accomplish this using LINQ?
I have ten numbers like 1.1,2.5,3.7,4.9,5.4,6.2,7.6,8.9,9.0,3.56
How I can find the largest number in the group?? I can do comparison of two number and repeat the process but it is very long, is there any other ways??
I have a specialized string dictionary of (string, string) (_RulesAndTheirDescriptions) that contains the name (key) and description (value) of methods in a given class. I currently do the following query to search for a match on the key or value and then bind that to a grid.
[Code]...
I am having so trouble with the ToUpper() procedure with strings. I am using LINQ to find unique values in a list of objects. In that whole process I set the values to compare to all lowercase in order to get a proper list. My goal is to populate a dropdown list with the values. I'm attempting to set the first letter of of the string to uppercase and keep the rest lowercase however the toUpper() procedure is not working?
Private Function FixCase(ByVal strIn) As String
Dim strOutput As String
Dim intStringLength As Integer = strIn.Length - 1
strOutput = strIn.Substring(0, 1)
[code].....
I'm using vb10.
Public
Function RndNum(ByVal
NumLwr As
[code]...
I want to find which of the 64 elements has the highest number and which of the 64 elements has the lowest number?Is there a new command in vb10 to do this quick with little code?
How to create a function to find the largest value(subitem) within a listview column
View 11 RepliesAm using VB 2005 and need to take an existing txt file which basically has 15 sets of data, each set containing a year (ie Year 1990) and a number below the year.
When a user clicks the calculate button on a form, I need it to first list the average of all those numbers in the txt. And below that I need the largest number in the file to be displayed.
I am basically familiar with using objReader and StreamReader. But, I can only verify and open the text.
I am creating a sailing score points program and want to create something like: what TEXTBOX has got biggest number that is between (TEXTBOX IS BETWEEN NOT THE NUMBER) [ and ] And it's subtracts that number what is in that box from the textbox3 when possible then how to do like:
under textbox are four checkboxes Named: DNS, DNF, DSQ and OCS and they give so much points how many are the sailers + 1. The setting name is Sailers
(Scoring system is ISAF low-point 2005-2008)
I am attempting to read the results from a SQL query into a List(Of) and I can see the List.count while adding items to the List increments, however in another part of my code when I am attempting to read the List the List.Count returns 0. My List is as follows:
[Code]...
I have a list(Of transaction) :
[Code]....
How can I transform it to a list(Of transactionShortened) :
[Code]....
C# or VB.NET is fine. I'd like to count number of people for each country from the following tables with LINQ to SQL I have two tables, one is Countries and other is People. It's one to many relatoionship from Countries to People. ountries table column:CountryId,CountryName People:PeopleId,FullName,CountryId (a primary key from Country table and allowed null) I want to count how many people each country has and get something like the following result that shows only the country that has people. Because there are some countries that have no people in the People table.
[Code]...
What I have right now is this:
Dim users = From users In tempTable _
Distinct Select users.Item("s_userid")
Dim usersCount As Integer = users.Count
But I pretty sure I shouldn't have to do that. I should be able to get the count in/from that first linq query.
I have this linq to entity
From r In ReceiptRepository.Fetch
Where
r.RECEIPTDATE >= ReportStartDate And
[Code]....
This is working fine, except the count property, it is just giving the number of group count. I don't know how to find out each Tender Count
I have to perform the following SQL query: select answer_nbr, count(distinct user_nbr)
from tpoll_answer where poll_nbr = 16 group by answer_nbr The LINQ to SQL query
[Code]...
Dim mydata = (From c In dc.Table Select New With {c.ID}).Count
any faster than this:
Dim mydata = (From c In dc.Table Select c).Count
[code].....
I write the code below. I want to make short using linq count.
Dim query0 = From obj In dtAginglist _
Where (obj.Field(Of String)("CurrentStatus") = "Open" Or obj.Field(Of String)("CurrentStatus") = "Acknowledge") _
[Code]....
I try to use code below but it dosen't work with if source is datatable.
Dim orderCounts = From c In customers New With { _
c.CustomerID, Key .OrderCount = c.Orders.Count() }
I have a Table:
[Code]...
I'm trying by LINQ-query (VB.NET) to return a count for distinct value of Objects, Stuffs and Colours for every Room:
[Code]...
I'm very new to linq and I'm trying to come up with a linq query against a dataset that will return a max count value based on grouping records.[code]...
View 1 RepliesI'm trying to create a LINQ query (or queries) that count the total number of occurences of a combinations of items in one list that exist in a different list. For example, take the following lists:
CartItems DiscountItems
========= =============
AAA AAA
[code]....
The result of the query operation should be 2 since I can find two combinations of AAA and BBB (from DiscountItems) within the contents of CartItems.My thinking in approaching the query is to join the lists together to shorten CartItems to only include items from DiscountItems. The solution would be to find the CartItem in the resulting query that occurs the least amount of times, thus indicating how many combinations of items exist in CartItems.When CartItems is filtered to only the items in DiscountItems, it can be visually displayed like this:
CartItems that get a discount
=============================
AAA BBB <= This combination is eligible for a discount
AAA BBB <= This combination is eligible for a discount
AAA <= Not eligible
Thus, because there are 2 combinations of the discount in the Cart, the result is 2.Here's the query I already have, but it's not working. query results in an enumeration with 100 items, far more than I expected.
Dim query = From cartItem In Cart.CartItems
Group Join discountItem
In DiscountGroup.DiscountItems
[code]....
I'd take both C# and VB.NET suggestion.I'm using LINQ to query data. I'm trying to query the parent and count the child tags.Here's my Tags table column:
TagId (int primary)
TagName
ParentId (int Allow NULL referred to TagId column)
Here's some sample data:
[Code]...
I have a the following Class structure. Company > List(of Departments) > List(of Employees) I want to Query a Company to find out if it has a department of the following name and a Employee in that department with the following ID! How could I query this. The way I have the code it expect to return one department so I have it doing
[Code]...
I have a requirement where I have to add items into a List(Of T) (let's call it Target) from an IEnumerable(Of T) (let's call it Source) using Target.AddRange() in VB.NET.
Target.AddRange(Source.TakeWhie(Function(X, Index) ?))
The ? part is a tricky condition that is something like: As long as the as yet unenumerated count is not equal to what is needed to fill the list to the minimum required then randomly decide if the current item should be taken, otherwise take the item.Somethig like...
Source.Count() - Index = _minimum_required - _curr_count_of_items_taken _
OrElse GetRandomNumberBetween1And100() <= _probability_this_item_is_taken
' _minimum_required and _probability_this_item_is_taken are constants
The confounding part is that _curr_count_of_items_taken needs to be incremented each time the TakeWhile statement is satisfied. How would I go about doing that? I'm also open to a solution that uses any other LINQ methods (Aggregate, Where, etc.) instead of TakeWhile.If all else fails then I will go back to using a good old for-loop =)
How to find the number of horizontal rows in a 2D array ?
I have :
Dim i(,) As Integer = {{2, 5, 6, 7}, {32, 5, 4, 2}}
Find the number of rows in i ?
For example :
// Here, array i has 2 sets of data i.e. 2 rows
// set1 = {2,5,6,7} and set2 = {32,5,4,2}
// So, I want the number of sets i.e 2 in this case !
y have this class
Private Class MyClass
Public Property propertyOne() as String
Public Property propertyTwo() as String
[code].....
I have the following SQL query to return all Customers who have no OrderLines with no Parts assigned - i.e. I only want the customers within which every order line of every order has no parts assigned - (in the actual problem I am dealing with a different domain but have translated to customers/orders to illustrate the problem)
SELECT c.Customer_PK
FROM Customers c
INNER JOIN Orders o[code].....
This works but generates less than optimal SQL - it is doing a subquery for Count on each row of the customers query rather than using Group By and Having. I tried making the LINQ Group By syntax work but it kept putting the filter as a WHERE not a HAVING clause.Edit in response to Answers below: I am accepting JamieSee's answer as it addresses the stated problem, even though it does not produce the GROUP BY HAVING query I originally had.I am a VB developer so I have had a crack translating your code to VB, this is the closest I got to but it does not quite produce the desired output:
Dim qry = From c In context.Customers
Group Join o In context.Orders On c.Customer_PK Equals o.Customer_FK
Into joinedOrders = Group[cod].....
The problem I had is that I have to push "jl" into the Group By "Key" so I can reference it from the Where clause, otherwise the compiler cannot see that variable or any of the other variables appearing before the Group By clause.With the filter as specified I get all customers where at least one order has lines with no parts rather than only customers with no parts in any order.
I have a List (Of String()). I wish to find the count of the 3 item in each string array in the list. Is there an easy way to find it using linq?
View 9 Replies