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• Get Max() record from table by group

  - by Garcia Julien

  Hi, i've got a table like that : Article Number Last Voucher Number Last Voucher Date 0557934 519048 04/02/2005 0557934 519067 04/02/2005 0557934 528630 09/29/2005 0557934 528631 09/29/2005 0557934 529374 10/13/2005 0557934 529375 10/13/2005 0557934 529471 10/16/2005 0557934 529472 10/16/2005 0557934 535306 01/08/2006 0557934 535307 01/08/2006 0557934 1106009 08/10/2006 0557934 1106010 08/10/2006 0022738 22554 02/20/1995 0022738 22595 03/12/1995 0022738 22597 03/15/1995 0022738 22605 03/19/1995 0022738 22616 03/25/1995 0022738 22621 03/28/1995 0022738 22630 04/05/1995 I would like to have only the record with the last date : Article Number Last Voucher Number Last Voucher Date 0557934 1106010 08/10/2006 0022738 22630 04/05/1995 I can do directly on SQL or on Linq. Any idea? Ju

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• Entity Framework v2 cache

  - by Jacob

  In EF v1 when we used GetObjectByKey on our context object contrary to linq query it stored queried object in cache is there any change in EF v2 (.NET 4) ?

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• How to make a Generic Repository?

  - by chobo2

  Hi I am wondering if anyone has any good tutorials(or maybe even a library that is already made and well documented) on making a generic repository. I am using currently linq to sql but it might change so I don't know if you can make a generic repository that would take little to no changes if I would say switch to entity framework. Thanks

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• MVC-like Autogenerated Pages for Webforms

  - by CccTrash

  I noticed that MVC lets you pass in LINQ to SQL objects to its views and it will autogenerate Create, Update and View Pages based on the LINQtoSQL object. Is there anything for webforms that lets you do this kind of thing? (In a nice way with validators maybe?)

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• .Net Framework DataTable.Select(String) method when the filter expression contains ' or "

  - by iulianchira

  In a .Net web application I use the public DataRow[] Select(string filterExpression) method in many places. Due to a last minute change characters such as ' and " are now valid input. What options do I have, is there a way to change the filterExpression in an adequate way and still preserve the Select functionality on the datatable, can I switch to LINQ?

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• SQL Compact - Hang on invalid file

  - by eWolf

  I use Linq to Sql Compact with code generated by sqlmetal. When I open an invalid database, like eg an mp3, I can create the DataContext without getting an Exception. But when I query any data or call DatabaseExists, the application hangs. Why is no exception thrown? Is this a known problem?

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• LINQ2SQL: how many datacontexts ?

  - by sh00

  I have a SQL Server 2008 database with 300 tables. The application I have to design is an Windows Forms app, .NET 3.5, C#. Which is the best way to work with LINQ2SQL ? I intend to make a datacontext for each business entity. Is there any problem ? I need to know if this way of working with LINQ has any disadvantage or can create performance issues ? Thanks.

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• retrieve image from sql server in picturebox

  - by user3116296

  I have saved a picture in sql server and now i can not to retrieve image and set it's in picturebox with linq. why byte[] x become null? private void dataGridViewUser_CellClick(object sender, DataGridViewCellEventArgs e) { DataGridViewRow row = dataGridViewUser.CurrentRow; byte[] x=(byte[])row.Cells["Image"].Value; MemoryStream ms1 = new MemoryStream(x); picuser.Image = Bitmap.FromStream(ms1); }

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• How to create dynamic table in dbml file?

  - by Naseem

  Hi, I'm using linq to sql. I have a table in dbml file that some of its fields can be generate dynamically (at run time). Is there any way to add fields to a table dynamiccaly , or add a class to dbml file dynamically? Thank you, Naseem

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• Looping over ILookup, accessing values

  - by Jono

  I've got a ILookup< string, List<CustomObject> > from some linq I've done. I'd like to now iterate over the results: foreach(IGrouping<string, List<CustomObject>> groupItem in lookupTable) { groupItem.Key; //You can access the key, but not the list of CustomObject } I know I must be misrepresenting a IGrouping as a KeyValuePair, but now I'm not sure how to access it properly.

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• Is entity frameworth worth moving to for a new small app?

  - by Greg

  Hi Is entity frameworth worth moving to for a new small app? About 10 tables and a WinForms app. ie the alternative being DataTables/DataRows or Linq-to-SQL

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• Determine the relative compliment of two IEnumerable<T> sets in .net

  - by SFun28

  Hi! Is there an easy way to get the relative compliment of two sets? Perhaps using LINQ? http://en.wikipedia.org/wiki/Complement_(set_theory) I have to find the relative compliment of a set A relative to B. Both A and B are of type HashSet but I think the algorithm could be made more generation (IEnumerable or even ISet)? I could use a solution in either vb.net or C#.

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• Is Entity Framework worth moving to for a new small app?

  - by Greg

  Hi Is Entity Framework worth moving to for a new small app? About 10 tables and a WinForms app. ie the alternative being DataTables/DataRows or Linq-to-SQL

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• how do you add a condition to a lambda expression

  - by ooo

  if i have this code today to find out a sum total using LINQ: return (MyArray.Sum(r => r.Trips); and i want to only include itms where r.CanDrive == true. can you add a condition into a single linke lambda expression? how would you do this

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• C# Check for missing number in sequence

  - by Jon

  I have an List<int> which contains 1,2,4,7,9 for example. I have a range from 0 to 10. Is there a way to determine what numbers are missing in that sequence? I thought LINQ might provide an option but I can't see one In the real world my List could contain 100,000 items so performance is key

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• Cannot convert lamda expression

  - by Kirsty White

  If I try: Groups = students.Remove(f => f.StudentID.Equals(studentID)); I get an error on this line: f => f.StudentID.Equals(studentID) I am having difficulty from my previous posts here linq deleted users still associated with groups and here Delete method in WCF So I thought maybe I could delete the students contained within groups but I get an error Cannot convert lamda expression to type Student because it is not a delegate type.

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• VB.NET Use With keyword on existing object?

  - by ropstah

  Is it somehow possible to use the 'With' keyword on an existing object? I would like to do the following using LINQ to objects and can't seem to find a way: From m as Product in Me _ Select m With {.Match = m.Name.IndexOf(query)} _ Where m.Name.IndexOf(query) > 0

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• Foreign Keys Duplicated in DataGridView

  - by John Doe

  I created a Windows Forms Application to which I added a DataGridView and LINQ to SQL Classes from one of my databases. I can successfully bind one of my database's tables to my DataGridView: var dataSource = from c in _db.NetworkedEquipments select c; dataGridView1.DataSource = dataSource; However, the foreign keys get duplicated, that is, the columns appear twice. How can I prevent this?

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• Store an image in a SQL Server CE database

  - by Vaccano

  Does any one know of an example on how to store an image in a SQL Server CE database? What data type should the column be? (I am guessing binary.) I use Linq-To-Datasets. Is it possible using that to put the image into the database and pull it out again later? Thanks for any advice.

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• What does DataContext.GetTable<TEntry> do?

  - by Bryan

  Consider I have a DataContext db, and there is an Entity class User. So when System.Data.Linq.Table<User> table = db.GetTable<User>(); is called for the first time, does it pull the data from the database immediately, does it use deferred execution, or were the data already loaded from database when db was initialized?

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• field<t> invalid cast

  - by Zwempha

  I'm having problems when using linq on a datatable.asenumerable(). This throws InvalidCastException. DateTime date=r.Field<DateTime>("date"); This works fine. DateTime date = DateTime.Parse(r.Field<string>("date")); What am I missing? Regards Sven

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• Cast IEnumerable<Inherited> To IEnumerable<Base>

  - by david2342

  I'm trying to cast an IEnumerable of an inherited type to IEnumerable of base class. Have tried following: var test = resultFromDb.Cast<BookedResource>(); return test.ToList(); But getting error: You cannot convert these types. Linq to Entities only supports conversion primitive EDM-types. The classes involved look like this: public partial class HistoryBookedResource : BookedResource { } public partial class HistoryBookedResource { public int ResourceId { get; set; } public string DateFrom { get; set; } public string TimeFrom { get; set; } public string TimeTo { get; set; } } public partial class BookedResource { public int ResourceId { get; set; } public string DateFrom { get; set; } public string TimeFrom { get; set; } public string TimeTo { get; set; } } [MetadataType(typeof(BookedResourceMetaData))] public partial class BookedResource { } public class BookedResourceMetaData { [Required(ErrorMessage = "Resource id is Required")] [Range(0, int.MaxValue, ErrorMessage = "Resource id is must be an number")] public object ResourceId { get; set; } [Required(ErrorMessage = "Date is Required")] public object DateFrom { get; set; } [Required(ErrorMessage = "Time From is Required")] public object TimeFrom { get; set; } [Required(ErrorMessage = "Time to is Required")] public object TimeTo { get; set; } } The problem I'm trying to solve is to get records from table HistoryBookedResource and have the result in an IEnumerable<BookedResource> using Entity Framework and LINQ. UPDATE: When using the following the cast seams to work but when trying to loop with a foreach the data is lost. resultFromDb.ToList() as IEnumerable<BookedResource>; UPDATE 2: Im using entity frameworks generated model, model (edmx) is created from database, edmx include classes that reprecent the database tables. In database i have a history table for old BookedResource and it can happen that the user want to look at these and to get the old data from the database entity framework uses classes with the same name as the tables to receive data from db. So i receive the data from table HistoryBookedResource in HistoryBookedResource class. Because entity framework generate the partial classes with the properties i dont know if i can make them virtual and override. Any suggestions will be greatly appreciated.

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• Does Table.InsertOnSubmit create a copy of the original table?

  - by Bryan

  Using InsertOnSubmit seems to have some memory overhead. I have a System.Data.Linq.Table<User> table. When I do table.InsertOnSubmit(user) and then int count = table.Count(), the memory usage of my application increases by roughly the size of the User table, but the count is the number of items before user was inserted. So I'm guess an enumeration after InsertOnSubmit will create a copy of the table. Is that true?

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• What is the best way to determine if table already has record with specific ID?

  - by iburlakov

  Hello. I have a short question. Im my current project I'm using LINQ-to-SQl. That is the best way to determine if table has record with specific ID? Thanks in advance.

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• Most suitable collection for multithreading requests?

  - by Raj Aththanayake

  I have ~10,000 records would like to keep in a collection in memory and execute LINQ queries against it. This collection should be available for all the users in the application domain and can access concurrently. I’m looking for a .NET collection that supports multithreading can query asynchronously and efficiently without any threading issues. Any suggestions on deciding a collection for this?

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