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  • How to wrap LINQ to SQL queries in stored proc?

    - by Satish
    LINQ to SQL internally generates SQL queries and fire on the database after submitting changes. Is there any way we can wrap all these queries in some stored procedure and execute this store proc everytime when anything gets inserted or updated in the database. Problem is only stored procedures are allowed to carry any insert or update or delete operations, direct queries are restricted for security purpose.

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  • How to use LINQ to query list of strings that do not contain substring entries from another list

    - by p.campbell
    string candidates = new string[] { "Luke_jedi", "Force_unknown", "Vader_jedi" , "Emperor_human", "r2d2_robot" }; string[] disregard = new string[] {"_robot", "_jedi"}; //find those that aren't jedi or robots. var nonJedi = candidates.Where(c=> c.??? //likely using EndsWith() and Any() ); How would you implement this solution using LINQ to find all those that do not end with any of the disregards items?

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  • How to use Linq To Sql to get Users who has less than 2 photos?

    - by Mike108
    The scenario is I want to get the users who has less than 2 photos. There are two table: [Users] (UserId, UserName) [UserPhotos] (PhotoId, PhotoName, UserId) UserId is a Foreign Key but I do not want to use association like user.Photos. A user may have none photo in the [UserPhotos] table. How to use Linq To Sql to get List<User> who has less than 2 photos?

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  • How do I check if a Linq to SQL entity has grandchildren?

    - by EdenMachine
    How can I find out if a Linq to SQL entity has grandchildren or not? Pseudo-code below: Return From p In dc.Processes Where p.Signers.Count > 0 and p.Signers.Signatures.Count > 0 Obviously I can't run the code above but I need to make sure that all the returning Processes have at least one Signer and that all of those Signers have at least one Signature. TIA!

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  • How do I use "Into" LINQ expression in VB.NET?

    - by SLC
    I'm converting from C# this LINQ expression. However, it does not seem to work. C# return (from w in fishSticks group w by w.FishQty into g orderby g.Key descending select g).First().First(); VB Return (From w In fishSticks Group w By w.FishQty Into g() Order By g.Key Descending Select g).First().First() Visual Studio turns g into g() itself and then gives me this error: Definition of method 'g' is not accessible in this context. Any ideas?

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  • How do I perform this XPath query with Linq?

    - by John Hansen
    In the following code I am using XPath to find all of the matching nodes using XPath, and appending the values to a StringBuilder. StringBuilder sb = new StringBuilder(); foreach (XmlNode node in this.Data.SelectNodes("ID/item[@id=200]/DAT[1]/line[position()>1]/data[1]/text()")) { sb.Append(node.Value); } return sb.ToString(); How do I do the same thing, except using Linq to XML instead? Assume that in the new version, this.Data is an XElement object.

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  • Is it OK to try to use Plinq in all Linq queries?

    - by Tony_Henrich
    I read that PLinq will automatically use non parallel Linq if it finds PLinq to be more expensive. So I figured then why not use PLinq for everything (when possible) and let the runtime decide which one to use. The apps will be deployed to multicore servers and I am OK to develop a little more code to deal with parallelism. What are the pitfalls of using plinq as a default?

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  • Linq to SQL: how get row security between write access??

    - by Francisco
    I would like to allow two threads to write in a table at the same time (I know the problem of updating the same row, but this would be a story apart). I need that in behalf of speed up the operations in my aplication (one thread could write in row X while another could do the same in row X+n instead of waiting the first to finalize). So, can I block rows instead of tables with Linq to SQL? Thanks.

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  • C#, LINQ. How to find an element within group of elements

    - by Bobb
    Imagine you have int[] data = new int [] { 1, 2, 1, 1, 3, 2 } I need sub-array with only those which conform to a condition data[i] data[i-1] && data[i] data[i + 1]... i.e. I need all items which stick over their immediate neighbours. From example above I should get { 2, 3 } Can it be done in LINQ? Thanks

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  • What is the difference between Equals and = in LINQ?

    - by sunpech
    What is the difference between Equals and = in LINQ? Dim list As List(Of Foo) = (From a As Foo In FooList _ Join b As Bar In BarList _ On a.Something = b.Something _ Select a).ToList() versus Dim list As List(Of Foo) = (From a As Foo In FooList _ Join b As Bar In BarList _ On a.Something Equals b.Something _ Select a).ToList()

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  • How to convert SQL Statement with TOP, COUNT and GROUP BY to return an object list with LINQ

    - by Junior Mayhé
    Hello guys does anyone know how to convert this SQL statement to a LINQ to a List? SELECT TOP(5) COUNT(CategoryId), CategoryName FROM Tickets GROUP BY CategoryName The result would be something like public static List<Categories> List() { MyEntities db = new MyEntities(); /* here it should return a list o Category type */; return db.Category.GroupBy(...).OrderBy(...); }

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  • How to check results of LINQ to SQL query?

    - by rem
    In a WPF app I'd like to check if a return of a LINQ to SQL query contains some records, but my approach doesn't work: TdbDataContext context = new TdbDataContext(); var sh = from p in context.Items where p.Selected == true select p; if (sh == null) { MessageBox.Show("There are no Selected Items"); } Where am I wrong?

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  • How to select with Linq to Entity from one table with two different variables?

    - by George
    I have a table where I have items under two different types as you can see below: How can I select from this table with Linq to Entity to get the result with two variables? where ItemType = Type1 and ItemType == Type2 .... select new {typeOne == "", typeTwo == ""}; ID ItemName ItemType 1 ItemOne Type1 2 ItemTwo Type1 3 ItemThree Type1 4 ItemFour Type1 5 ItemTFive Type2 6 ItemSix Type2 7 ItemSeven Type2 8 ItemEight Type2

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  • 30 seconds from File|New to a new CRUD Silverlight application with Teleriks new LINQ Implementation

    Last month Telerik released its new LINQ implementation and last week we released the new Data Services Wizard for Telerik OpenAccess, which supports both traditional OpenAccess entities and the new LINQ implementation. I will a walk you through the process where you can connect to a database, add a new domain model, wrap it in a new WCF Data Services (Astoria) service, and add a CRUD enabled Silverlight application. All in 30 seconds! Step 1: Build your Domain Model (20 seconds) Open Visual Studio 2010 RTM (or 2008) and add a new ASP.NET project. Right click on the project and select Add|New Item and choose Telerk OpenAccess Domain Model from the item template list. The Visual Entity Designer wizard comes up. Select the database server you are using in the first screen (SQL Server, Oracle, SQL Azure, MySQL, etc) and then also build your database connection string. Next select the tables, views, and stored procedures you want ...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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