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  • Gave a talk at SoCal Code Camp at USC today titled “Linq to Objects A-Z”

    - by dotneteer
    I gave a talk at SoCal Code Camp on Linq to Objects. With careful categorization of Linq functions, I was able to cover the entire set of Linq functions in only 35 minutes. I was able to spend the rest time on demos. In my first demo, I show I was able to write a top 20 URL type of query using 4 lines of library code and 9 line of Linq code without tools like Log Parser. I also demonstrated that I only need to change 2 lines of code from querying a single log file to a whole directory of log files. It would be as simple to run the query against multiple servers in parallel. In my second demo, I discussed how to turn into graph depth-first-search (DFS) and breath-first-search (BFS) in the a Linq queryable problem. The class LingToGraph contains the only DFS and BFS code I ever have to write; the rest could be done the the lambda passed to the DFS or BFS calls. In future blogs, I will provide more details explanation of code. Links: Link to Powerpoint slides. Link to demos.

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  • Why does LINQ-to-Entites recognize my custom method?

    - by BlueRaja The Green Unicorn
    This works: (from o in Entities.WorkOrderSet select o) .Where(MyCustomMethod); This does not: (from o in Entities.WorkOrderSet select new { WorkOrder = o }) .Where(o => MyCustomMethod(o.WorkOrder); I understand why the second doesn't work - but why in the world does the first work!? Shouldn't I get a "custom method not recognized?" For reference, here is MyCustomMethod public bool MyCustomMethod(WorkOrder workOrder) { return !workOrder.WorkOrderNum.StartsWith("A", StringComparison.CurrentCultureIgnoreCase); }

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  • Entity framework (3.5): How to translate a certain LINQ query to eSQL?

    - by Sebastian P.R. Gingter
    Hi there, I have the following LINQ query that I need to translate to Entity SQL /eSQL): return (ObjectQuery<User>) from user in Users where !user.Roles.Any(r => r.AnIntegerProperty < 0) select user; User.Roles is an navigation property to the n:m relation to Roles and there also is a Role.Users navigation property the other way round. There aren't User_Roles or Roles_User Entities available in the model, and I can't add these. I also can't use the LINQ statement here, because I need to add .OrderBy("it." + propertyname) (comes from another source, can't change that too) later on which is not possible if the ObjectQuery is build with linq. So how do I translate this to eSQL? And where can I find good eSQL samples? I searched for a whole day until now and must admit that eSQL reference is lousy and there aren't any usable examples around the web.

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  • C# LINQ: How to remove element from IQueryable<T>

    - by aximili
    How do you loop through IQueryable and remove some elements I don't need. I am looking for something like this var items = MyDataContext.Items.Where(x => x.Container.ID == myContainerId); foreach(Item item in items) { if(IsNotWhatINeed(item)) items.Remove(item); } Is it possible? Thanks in advance

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  • Mock a Linq to Sql EntityRef using Moq?

    - by Jeremy Holt
    My datacontext contains a table named Userlog with a one to many relationship with table UserProfile. In class UserLog public UserProfile UserProfile { get {return this._UserProfile.Entity;} } In class UserProfile public EntitySet<UserLog> UserLogs { get{return this._UserLogs;} } { set {this._UserLogs.Assign(value); } How would I go about mocking (using Moq) UserLog.UserProfile without changing the autogenerated code? What I would like to do is something like: var mockUserLog = new Mock<UserLog>(); mockUserLog.Setup(c=>c.UserProfile.FirstName).Returns("Fred"); etc I can do this if I go into the designer.cs and make FirstName and UserProfile virtual, however I would like to do this in the partial class. Any ideas? Thanks Jeremy

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  • Linq 2 Sql DateTime format to string yyyy-MM-dd

    - by Bogdan Maxim
    Basically, i need the equivalent of T-SQL CONVERT(NVARCHAR(10), datevalue, 126) I've tried: from t in ctx.table select t.Date.ToString("yyyy-MM-dd") but it throws not supported exception from t in ctx.table select "" + t.Date.Year + "-" + t.Date.Month + "-" + t.Date.Day but i don't think it's an usable solution, because i might need to be able to change the format. The only option I see is to use Convert.ToString(t.Date, FormatProvider), but i need a format provider, and I'm not sure it works either.

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  • delete element from xml using LINQ

    - by Shishir
    Hello I've a xml file like: <starting> <start> <site>mushfiq.com</site> <site>mee.con</site> <site>ttttt.co</site> <site>jkjhkhjkh</site> <site>jhkhjkjhkhjkhjkjhkh</site> <site>dasdasdasdasdasdas</site> </start> </starting> Now I need to delete any ... and value will randomly be given from a textbox. Here is my code : XDocument doc = XDocument.Load(@"AddedSites.xml"); var deleteQuery = from r in doc.Descendants("start") where r.Element("site").Value == txt.Text.Trim() select r; foreach (var qry in deleteQuery) { qry.Element("site").Remove(); } doc.Save(@"AddedSites.xml"); If I put the value of first element in the textbox then it can delete it, but if I put any value of element except the first element's value it could not able to delete! I need I'll put any value of any element...as it can be 2nd element or 3rd or 4th and so on.... can anyone help me out? thanks in advanced!

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  • LINQ: How to remove element from IQueryable<T>

    - by aximili
    How do you loop through IQueryable and remove some elements I don't need. I am looking for something like this var items = MyDataContext.Items.Where(x => x.Container.ID == myContainerId); foreach(Item item in items) { if(IsNotWhatINeed(item)) items.Remove(item); } Is it possible? Thanks in advance

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  • vs2010 Linq to SQL -- adding an entity from my DBML

    - by Matt
    I think I may be going crazy here... Anyways, I have a DBML with a table 'User' in it. Pretty simple stuff -- From within a class, I have the following: BusinessDataContext businessDataContext = new BusinessDataContext(); var user = new User(); user.FirstName = FirstName; user.LastName = LastName; user.MiddleInitial = MiddleInitial; user.DateCreated = DateTime.UtcNow; /* There's no businessDataContext.User.Add method -- There's a bunch of generic collection methods with the <> symbols (Aggregate, All, Any...) Am I just too tired and missing something basic or did something simple change with vs 2010? */ businessDataContext.SubmitChanges(); I think I really just need sleep. :-)

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  • LINQ: GroupBy with maximum count in each group

    - by polarbear2k
    Hi, I have a list of duplicate numbers: Enumerable.Range(1,3).Select(o => Enumerable.Repeat(o, 3)).SelectMany(o => o) // {1,1,1,2,2,2,3,3,3} I group them and get quantity of occurance: Enumerable.Range(1,3).Select(o => Enumerable.Repeat(o, 3)).SelectMany(o => o) .GroupBy(o => o).Select(o => new { Qty = o.Count(), Num = o.Key }) Qty Num 3 1 3 2 3 3 What I really need is to limit the quantity per group to some number. If the limit is 2 the result for the above grouping would be: Qty Num 2 1 1 1 2 2 1 2 2 3 1 3 So, if Qty = 10 and limit is 4, the result is 3 rows (4, 4, 2). The Qty of each number is not equal like in example. The specified Qty limit is the same for whole list (doesn't differ based on number). Thanks

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  • linq to xml query returning a list of all child elements

    - by Xience
    I have got an xml document which looks something like this. <Root> <Info>....</Info> <Info>....</Info> <response>....</response> <warning>....</warning> <Info>....</Info> </Root> How can i write a linqToXML query so that it returns me an IEnumerable containing each child element, in this case all five child elements of , so that i could iterate over them. The order of child elements is not definite, neither is number of times the may appear. Thanks in advance

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  • How to update Child grid in asp.net using LINQ

    - by Raj Kumar
    Hi I have an asp.net page where i am using LINQdatasource to bind grid. Now whenever, if some one changes something in grid I want to update a history table. which is also shown as child grid for each row Let say I have a grid with two column Name and Age. it also has a child row with column field and datetime. so when ever if some one changes something in Name or Age column and saves it. A new row is inserted in child row with the name of field changed and date time when it was changed

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  • LINQ-to-SQL: ExecuteQuery(Type, String) populates one field, but not the other

    - by Daniel Schaffer
    I've written an app that I use as an agent to query data from a database and automatically load it into my distributed web cache. I do this by specifying an sql query and a type in a configuration. The code that actually does the querying looks like this: List<Object> result = null; try { result = dc.ExecuteQuery(elementType, entry.Command).OfType<Object>().ToList(); } catch (Exception ex) { HandleException(ex, WebCacheAgentLogEvent.DatabaseExecutionError); continue; } elementType is a System.Type created from the type specified in the configuration (using Type.GetType()), and entry.Command is the SQL query. The specific entity type I'm having an issue with looks like this: public class FooCount { [Column(Name = "foo_id")] public Int32 FooId { get; set; } [Column(Name = "count")] public Int32 Count { get; set; } } The SQL query looks like this: select foo_id as foo_id, sum(count) as [count] from foo_aggregates group by foo_id order by foo_id For some reason, when the query is executed, the "Count" property ends up populated, but not the "FooId" property. I tried running the query myself, and the correct column names are returned, and the column names match up with what I've specified in my mapping attributes. Help!

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  • Linq to Xml to Datagridview

    - by David Archer
    Right, starting to go crazy here. I have the following code: var query = (from c in db.Descendants("Customer") select c.Elements()); dgvEditCusts.DataSource = query.ToList(); In this, db relates to an XDocument.Load call. How can I get the data into the DataGridView? Just thought I should mention: it returns a completely blank dgv

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  • Taking a snapshot (cloning) of a project using Linq 2 Sql

    - by JoeBlogs1999
    I have a Project entity with several child tables, eg ProjectAwards ProjectTeamMember I would like to copy the data from Project (and child tables) into a new Project record and update the Project status. eg var projectEntity = getProjectEntity(projectId); draftProjectEntity = projectEntity draftProjectEntity.Status = NewStatus context.SubmitChanges(); I found this link from Marc Gravell Its part of the way there but it updates the child records to the new draftProject, where I need it to copy.

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  • LINQ list of sublist

    - by Nelson
    I'm trying to get all the sublists that don't inherit from a specified class and also get the parent/root list type. I can't quite figure out the syntax. Here's an example of the sort of thing I'm looking for. Thanks for any help you can give! public class Foo { public IList<Type> Bar { get; private set; } } List<Foo> test = new List<Foo>(); // Initialize, add values, etc. var result = from f in test from b in f.Bar where !b.IsSubclassOf(typeof(AnotherClass)) select f.GetType(), b

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  • Linq-to-SQL statement issue

    - by Anicho
    I am basically looking to bind a search query to a gridview which is nice, but this must be done by a users input query (sort of like a search function). I can get single values and rows returned, but how would I get it to search all columns in my database for the inputted values and return it? My code so far is: Void SearchFunction() { TiamoDataContext context = new TiamoDataContext(); var search = from p in context.UserProfiles where = p.DanceType == UserSearchString select p; UserSearchGrid.DataSource = search; UserSearchGrid.DataBind(); } I tried p.equals but am pretty sure thats not the way to go about it.

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  • Linq To Sql Concat() dropping fields in created TSQL

    - by user191468
    This is strange. I am moving a stored proc to a service. The TSQL unions multiple selects. To replicate this I created multiple queries resulting in a common new concrete type. Then I issue a return result.ToString(); and the resulting SQL selects have varying numbers of columns specified thus causing an MSSQL Msg 205... using (var db = GetDb()) { var fundInv = from f in db.funds select new Investments { Company = f.company, FullName = f.fullname, Admin = f.admin, Fund = f.fund1, FundCode = f.fundcode, Source = STR_FUNDS, IsPortfolio = false, IsActive = f.active, Strategy = f.strategy, SubStrategy = f.substrategy, AltStrategy = f.altstrategy, AltSubStrategy = f.altsubstrategy, Region = f.region, AltRegion = f.altregion, UseAlternate = f.usealt, ClassesAllowed = f.classallowed }; var stocksInv = from s in db.stocks where !fundInv.Select(f => f.Company).Contains(s.vehcode) select new Investments { Company = s.company, FullName = s.issuer, Admin = STR_PRS, Fund = s.shortname, FundCode = s.vehcode, Source = STR_STOCK, IsPortfolio = false, IsActive = (s.inactive == null), Strategy = s.style, SubStrategy = s.substyle, AltStrategy = s.altstyle, AltSubStrategy = s.altsubsty, Region = s.geography, AltRegion = s.altgeo, UseAlternate = s.usealt, ClassesAllowed = STR_GENERIC }; var bondsInv = from oi in db.bonds where !fundInv.Select(f => f.Company).Contains(oi.vehcode) select new Investments { Company = string.Empty, FullName = oi.issue, Admin = STR_PRS1, Fund = oi.issue, FundCode = oi.vehcode, Source = STR_BONDS, IsPortfolio = false, IsActive = oi.closed, Strategy = STR_OTH, SubStrategy = STR_OTH, AltStrategy = STR_OTH, AltSubStrategy = STR_OTH, Region = STR_OTH, AltRegion = STR_OTH, UseAlternate = false, ClassesAllowed = STR_GENERIC }; return (fundInv.Concat(stocksInv).Concat(bondsInv)).ToList(); } The code above results in a complex select statement where each "table" above has different column count. (see SQL below) I've been trying a few things but no change yet. Ideas are welcome. SELECT [t6].[company] AS [Company], [t6].[fullname] AS [FullName], [t6].[admin] AS [Admin], [t6].[fund] AS [Fund], [t6].[fundcode] AS [FundCode], [t6].[value] AS [Source], [t6].[value2] AS [IsPortfolio], [t6].[active] AS [IsActive], [t6].[strategy] AS [Strategy], [t6].[substrategy] AS [SubStrategy], [t6].[altstrategy] AS [AltStrategy], [t6].[altsubstrategy] AS [AltSubStrategy], [t6].[region] AS [Region], [t6].[altregion] AS [AltRegion], [t6].[usealt] AS [UseAlternate], [t6].[classallowed] AS [ClassesAllowed] FROM ( SELECT [t3].[company], [t3].[fullname], [t3].[admin], [t3].[fund], [t3].[fundcode], [t3].[value], [t3].[value2], [t3].[active], [t3].[strategy], [t3].[substrategy], [t3].[altstrategy], [t3].[altsubstrategy], [t3].[region], [t3].[altregion], [t3].[usealt], [t3].[classallowed] FROM ( SELECT [t0].[company], [t0].[fullname], [t0].[admin], [t0].[fund], [t0].[fundcode], @p0 AS [value], [t0].[active], [t0].[strategy], [t0].[substrategy], [t0].[altstrategy], [t0].[altsubstrategy], [t0].[region], [t0].[altregion], [t0].[usealt], [t0].[classallowed] FROM [zInvest].[funds] AS [t0] UNION ALL SELECT [t1].[company], [t1].[issuer], @p6 AS [value], [t1].[shortname], [t1].[vehcode], @p7 AS [value2], @p8 AS [value3], (CASE WHEN [t1].[inactive] IS NULL THEN 1 ELSE 0 END) AS [value5], [t1].[style], [t1].[substyle], [t1].[altstyle], [t1].[altsubsty], [t1].[geography], [t1].[altgeo], [t1].[usealt], @p10 AS [value6] FROM [zBank].[stocks] AS [t1] WHERE (NOT (EXISTS( SELECT NULL AS [EMPTY] FROM [zInvest].[funds] AS [t2] WHERE [t2].[company] = [t1].[vehcode] ))) AND ([t1].[vehcode] <> @p2) AND (SUBSTRING([t1].[vehcode], @p3 + 1, @p4) <> @p5) ) AS [t3] UNION ALL SELECT @p11 AS [value], [t4].[issue], @p12 AS [value2], [t4].[vehcode], @p13 AS [value3], @p14 AS [value4], [t4].[closed], @p16 AS [value6], @p17 AS [value7] FROM [zMut].[bonds] AS [t4] WHERE NOT (EXISTS( SELECT NULL AS [EMPTY] FROM [zInvest].[funds] AS [t5] WHERE [t5].[company] = [t4].[vehcode] )) ) AS [t6]

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  • Linq To Sql - DataContext.SubmitChanges() problem

    - by Ahmet Altun
    I have a code like this. DBContext is Datacontext instance. try { TBLORGANISM org = new TBLORGANISM(); org.OrganismDesc = p.Subject; DBContext.TBLORGANISMs.InsertOnSubmit(org); DBContext.SubmitChanges(); } catch (Exception) { } At this point, I want to IGNORE the error and want to be skipped. Not to be retried. But when I try another insert like TBLACTION act = new TBLACTION(); act.ActionDesc = p.ActionName; DBContext.TBLACTIONs.InsertOnSubmit(act); DBContext.SubmitChanges(); SubmitChanges firstly retries previous attempt. How can I tell "skip errors, don't try again"?

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  • Linq-to-SQL Grouping not ordering correctly

    - by Grant
    Hi can someone help me convert this tsql statement into c# linq2sql? select [series] from table group by [series] order by max([date]) desc This is what i have so far - the list is not in correct order.. var x = from c in db.Table orderby c.Date descending group c by c.Series into d select d.Key;

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