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• Use LINQ to count the number of combinations existing in two lists

  - by Ben McCormack

  I'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 AAA BBB AAA…

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• LINQ group one type of item

  - by Nelson

  I have a List that has various derived classes. I may have something like this: List<BaseClass> list = new List<BaseClass>() { new Class1(), new Class2(1), new Class3(), new Class2(2), new Class4() }; I am trying to use LINQ to semi-sort the list so that the natural order is maintained EXCEPT for Class2. All Class2…

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• LINQ to Entity, joining on NOT IN tables

  - by SlackerCoder

  My brain seems to be mush right now! I am using LINQ to Entity, and I need to get some data from one table that does NOT exist in another table. For example: I need the groupID, groupname and groupnumber from TABLE A where they do not exist in TABLE B. The groupID will exist in TABLE B, along with other relevant information. The tables do…

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• Using Linq to select a range of members in a list

  - by clintp

  Given a list of elements like so: int[] ia = new int[] { -4, 10, 11, 12, 13, -1, 9, 8, 7, 6, 5, 4, -2, 6, 15, 32, -5, 6, 19, 22 }; Is there an easy way in Linq to do something along the lines of "Select the elements from the -1 up to the next negative number (or the list exhausts)"? A successful result for -1…

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• Linq DataContext.Log - logging sql comman with parameters

  - by dzajdol

  Hi. I using Linq DataContext.Log and I want to save sql command with parameters. how may I do this?? Now to log is writing: SELECT [t0].[Id_User], [t0].[FirstName], [t0].[LastName], [t0].[UserName], [t0].[Password], [t0].[District_Id], [t0].[Active], [t0].[MobileDevice_Id], [t0].[IsMobile], [t0].[IsWWW], …

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• Use LINQ to SQL results inside SQL Server stored procedure

  - by ifwdev

  Note: I'm not trying to call a SQL Server stored proc using a L2SQL datacontext. I use LINQPad for some fairly complex "reporting" that takes L2SQL output saved to an Array and is processed further. For example, it's usually much easier to do multiple levels of grouping with LINQ to Objects instead of trying to…

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• Filter across 2 lists using LINQ

  - by Ajit Goel

  I have two lists: a. requestedAmenities b. units with amenities. I want to filter those units that have any one of the "requested amenities". I have tried to achieve the same result using foreach loops but I believe it should be much easier using LINQ. Can someone please help\advice? UnitAmenities…

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• See if item exists once in Enumerable (Linq)

  - by Stacey

  Given a list... class Item { public Name { get; set; } } List<Item> items = new List<Item> { new Item() { Name = "Item 1" }, new Item() { Name = "Item 1" }, new Item() { Name = "Item 2" }, new Item() { Name = "Item 3" } } List<Item> listing = new List<Item> { new…

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• Linq Distinct() by name for populate a dropdown list with name and value

  - by AndreMiranda

  I'm trying to populate a Drop down list with pharmaceutical companies, like Bayer, Medley etc. And, I'm getting theses names from DB and theses names are repeated in DB, but with different id's. I'm trying to use Linq Distinct(), but I don't want to use the equality comparer. Is there another way? My…

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• Linq query: append column to query results

  - by jrubengb

  I am trying to figure out how to append a column to Linq query results based on the max value of the query. Essentially, I want to create an EnumerableRowCollection of DataRows that would include a max value record with the same value for each record. So if i have a hundred records returned through…

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• Need help with a LINQ ArgumentOutOfRangeException in C#

  - by Christopher Klein

  Hi there, Hoping this is a nice softball of a question for a friday but I have the following line of code: //System.ArgumentOutOfRangeException generated if there is no matching data currentAnswers = new CurrentAnswersCollection().Where("PARTICIPANT_ID", 10000).Load()[0]; …

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• Make a usable Join relationship with LINQ on top of a database CSV design error

  - by jdk

  I'm looking for a way to fix and/or abstract away a comma-separated values (CSV) list in a database field in order to reconstruct a usable relationship such that I can properly join the two tables below and query them using LINQ and its Join method. Following is a sample showing the…

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• Linq Query Giving Error

  - by user275561

  I am getting this error when I use the Linq expression of var emp = _testModel.Where(m => m.Date == DateTime.Now).Select(m=>m); 'System.Collections.Generic.IEnumerable' does not contain a definition for 'System' and no extension method 'System' accepting a first argument of…

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• LINQ-to-XML Error "is not a member of 'String'"

  - by mmcglynn

  The following code returns the error from the For Each loop. I have similar code that does not return the error. 'DisplayTitle' is not a member of 'Sting' Dim evXML As XDocument = XDocument.Load(Server.MapPath("~/App_Data/event.xml")) Dim sbEventDetail As New StringBuilder() Dim…

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• Call Method from LinQ query.

  - by Jitendra Jadav

  Hello Everybody, I am using Linq query and call method Like.. oPwd = objDecryptor.DecryptIt((c.Password.ToString()) it will return null value. Means this will not working. how I Resolve this. Thanks.. var q = from s in db.User join c in…

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• System.Linq.Dynamic and DateTime

  - by Matthew Hood

  I am using System.Linq.Dynamic to do custom where clauses from an ajax call in .Net MVC 1.0. It works fine for strings, int etc but not for DateTime, I get the exception cannot compare String to DateTime. The very simple test code is items = items.Where(string.Format(@" {0} …

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• linq and contains

  - by kusanagi

  i have func public PageOfList<ConsaltQuestion> Filter(int? type, int pageId, EntityCollection<ConsaltCost> ConsaltRoles) { // return _dataContext.ConsaltQuestion.Where((o => o.Type == type || type == null) && (o=>o.Paid == paid)); …

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• [LINQ noob] Please help me convert this Python 3.x snippet to .net LINQ.

  - by Hamish Grubijan

  I want to sort elements of a HashSet<string> and join them by a ; character. Python interpreter version: >>> st = {'jhg', 'uywer', 'nbcm', 'utr'} >>> strng = ';'.join(sorted(s)) >>> strng 'ASD;anmbh;ashgg;jhghjg' C# signature of a method I…

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• DataTable linq query iteration

  - by Ravi

  Hi, I want to Enumerate Linq Query. Below i specified example. EX: DataTable _slidingDataTable = new DataTable("test"); for(int i=0; i<5;i++) { DataRow row = _slidingDataTable.NewRow(); startPosition = DateTime.Now; for(int i=0; i<5;i++) { …

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• linq to xml and namespaces

  - by scott

  I'm always so excited to get a chance to use linq to xml and then I run into the same PITA issue with namespaces. Not sure what is wrong with me but I can never quite grok what is going on. Basically I just need to get the value of the responseCode element and so far…

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• Linq Query ignore empty parameters

  - by Cj Anderson

  How do I get Linq to ignore any parameters that are empty? So Lastname, Firstname, etc? If I have data in all parameters it works fine. refinedresult = From x In theresult _ Where x.<thelastname>.Value.TestPhoneElement(LastName) Or _ …

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• LINQ to SQl updating primary key field?

  - by Curtis White

  I have a linq to sql table/class that uses a GUID as both a primary key and as foreign key. This problem came up when factoring some code that previously worked. The exception generated is "Operation is not valid due to the current state of the object." The process…

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• Update through Linq-to-SQL DataContext not working.

  - by Puneet Dudeja

  I have created a small test for updating table using Linq-to-SQL DataContext as follows: using (pessimistic_exampleDataContext db = new pessimistic_exampleDataContext()) { var query = db.test1s.First(t => t.a == 3); if (query.b == "a") query.b = "b"; …

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• LINQ saving images to varbinary

  - by m4rc

  I'm having issues saving images to a varbinary(Max) field using LINQ. I can save files in the region of 10KB to the database no problems, but when it comes to files bigger than that, it's as though it doesn't even try. I've had a look in the SQL Server Profiler and…

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• Read Xlement fully using LinQ

  - by Ramya

  Hi, I have an XElement which I am getting after parsing an xml. This XElement needs to be read only when the need arises so, I have stored it in a list for future use. I have to read this XElement using LinQ. XDocument doc =…

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