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  • Only get the value if a condition is true

    - by Autolycus
    I am checking to see if element1, element 2 or element 3 exists and then add them to finalData if they exist. However if one of those dont exist or are not true then I just want to add the elements whose bool value is true! Below is my code bool hasElement1 = ( from Playlist in loaded.Descendants("Node") select Playlist.Descendants("Element1").Any() ).Single(); bool hasElement2 = ( from Playlist in loaded.Descendants("Node") select Playlist.Descendants("Element2").Any() ).Single(); bool hasElement3 = ( from Playlist in loaded.Descendants("Node") select Playlist.Descendants("Element2").Any() ).Single(); var finalData = from x in loaded.Descendants("Node") select new { Element1 = x.Descendants("Element1").First().Value, Element2 = x.Descendants("Element2").First().Value, Element3 = x.Descendants("Element3").First().Value, };

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  • XElement return node value

    - by theDawckta
    I have an XElement that looks like this; <VideoFiles> <VideoFileInfo> <VideoType>1000</VideoType> <FormatCode>1000</FormatCode> <Url>http://www.idontwantthisvalue.com</Url> </VideoFileInfo> <VideoFileInfo> <VideoType>WMVOriginal</VideoType> <FormatCode>1004</FormatCode> <Url>http://www.iwanthitsvalue.com</Url> </VideoFile> I need to grab the value that has a sibling with a value of 1004. Can anyone help on this?

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  • problem with Expression not equal types

    - by user428547
    class first { private int? firstID; } class second { private int secondID; private int secondField; } public override Expression<Func<first, bool>> FirstFilter() { Contex db = new Contex(); List<second> list = (from p in db.second select p).ToList(); return b => list.Select(p => p.secondID).Contains(b.firstID); } and i have error: cannot convert from 'System.Collections.Generic.IEnumerable' to 'System.Collections.Generic.IEnumerable' i have tried many diferent ways, but i just don't know how can i fix it.

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  • Get length of a Dictionary

    - by StealthRT
    Hey all i am new at this Dictionary class in VB.net. I am wanting to reteive how many items in the Dictionary array there are: But doing this: Dim showNumber As Integer = tmpShows.Length Does not seem to yield 4 as it should? The code for the Dictionary i have is this: Dim all = New Dictionary(Of String, Object)() Dim info = New Dictionary(Of String, Object)() info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(3).ChildNodes(2).InnerText info!Shows = From tag In .SelectNodes(".//a[@class='thickbox']") Select New With {.Show = tag.Attributes("title").Value, .Link = tag.Attributes("href").Value} Dim tmpShows = all.Item(info!Station) Dim showNumber As Integer = tmpShows.Length What am i missing in order to get the 4 length i am looking for?

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  • Change query to use a LEFT join

    - by Craig
    I have a query which is failing, as it needs to be using LEFT JOIN, as opposed to the default INNER JOIN used by the 'join' syntax: var users = (from u in this._context.Users join p in this._context.Profiles on u.ProfileID equals p.ID join vw in this._context.vw_Contacts on u.ContactID equals vw.ID orderby u.Code select new { ID = u.ID, profileId = p.ID, u.ContactID, u.Code, u.UserName, vw.FileAs, p.Name, u.LastLogout, u.Inactive, u.Disabled }).ToList(); How would i re-write this so that is utilises a LEFT join?

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  • Telerik RADGrid - linq and updating

    - by Dave
    Hi Telerik's RADGrid, basing on their example on http://demos.telerik.com/aspnet-ajax/grid/examples/dataediting/programaticlinqupdates/defaultcs.aspx Problem: I can insert and delete, however updating doesn't work. No error trapped. Data just doesn't change. From the code below it looks like Telerik Grid is doing some kung-fu behind the scenes to wire things up. I can't see the db receiving any update statements. Question: anything obvious I'm missing? protected void RadGrid1_UpdateCommand(object source, GridCommandEventArgs e) { var editableItem = ((GridEditableItem) e.Item); var raceId = (Guid) editableItem.GetDataKeyValue("RaceID"); //retrive entity form the Db var race = DbContext.races.Where(n => n.raceid == raceId).FirstOrDefault(); if (race != null) { //update entity's state editableItem.UpdateValues(race); try { //submit chanages to Db DbContext.SubmitChanges(); } catch (Exception f) { ShowErrorMessage(f); } } } Think I may have to go back to their example.. get their db.. and attack from that point of view. Cheers!

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  • Linq Problem - Sequence contains no matching element

    - by Pino
    Ok I have the following, set-up and am recieving the following error. returnData.Options = this.ProductOptions.Select(o => o.ToDataModel()).ToList(); This line of code should do a conversion from DAL Entity (Subsonic) to a ViewModel. However I am recieving the following error message Server Error in '/' Application. Sequence contains no matching element Now, I've checked and the this.ProductOptions variable contains 3 results. Whats does this error meen and how can I debug it?

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  • Write XML using best way(Linq To XML or other)

    - by Pankaj
    Hello All I want to write my xml with following format. How can i do it?I am using c# <map borderColor='c5e5b8' fillColor='6a9057' numberSuffix=' Mill.' includeValueInLabels='0' labelSepChar=': ' baseFontSize='9' showFCMenuItem='0' hoverColor='c2bc23' showTitle='0' type='0' showCanvasBorder='0' bgAlpha='0,0' hoveronEmpty='1' includeNameInLabels='0' showLabels='1'> <!--toolText='Alaska'imageSave='1' imageSaveURL='Path/FusionChartsSave.aspx or FusionChartsSave.php'--> <data> <entity id='AL' value='AL' link="JavaScript:FilterClientProjectList('AL');" fontBold='1' showLabel='0' /> <entity id='AK' value='AK' link="JavaScript:FilterClientProjectList('AK');" fontBold='1' hoverColor='6a9057'/> <entity id='AZ' value='AZ' link="JavaScript:FilterClientProjectList('AZ');" fontBold='1'/> </data> <styles> <definition> <style name='MyFirstFontStyle' type='font' face='Verdana' size='11' color='0372AB' bold='1' bgColor='FFFFFF' /> </definition> <application> <apply toObject='Labels' styles='' /> </application> </styles> </map> Thanks in advance..

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  • dataannotation metadatatype register dll in global.aspx (linq to sql)

    - by mazhar
    I am trying to use dataannotation validation(I am not able to Fire the annotations as yet) in my mvc application. with reference to this article I want to confirm http://www.asp.net/mvc/tutorials/validation-with-the-data-annotation-validators-cs I am using vs 2008 professional edition . Do I really need to download Microsoft.web.mvc.dataannotation dll (The other dll is already present in the vs). to use(fire) datannotation on the page.? I am using partial views as well on the pages with dataviewmodel class(I will be using formviewmodel class for validation?)

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  • Linq IQueryable variables

    - by kevinw
    Hi i have a function that should return me a string but what is is doing is bringing me back the sql expression that i am using on the database what have i done wrong public static IQueryable XMLtoProcess(string strConnection) { Datalayer.HameserveDataContext db = new HameserveDataContext(strConnection); var xml = from x in db.JobImports where x.Processed == false select new { x.Content }; return xml; } this is the code sample this is what i should be getting back <PMZEDITRI TRI_TXNNO="11127" TRI_TXNSEQ="1" TRI_CODE="600" TRI_SUBTYPE="1" TRI_STATUS="Busy" TRI_CRDATE="2008-02-25T00:00:00.0000000-00:00" TRI_CRTIME="54540" TRI_PRTIME="0" TRI_BATCH="" TRI_REF="" TRI_CPY="main" C1="DEPL" C2="007311856/001" C3="14:55" C4="CUB2201" C5="MR WILLIAM HOGG" C6="CS12085393" C7="CS" C8="Blocked drain" C9="Scheme: CIS Home Rescue edi tests" C10="MR WILLIAM HOGG" C11="74 CROMARTY" C12="OUSTON" C13="CHESTER LE STREET" C14="COUNTY DURHAM" C15="" C16="DH2 1JY" C17="" C18="" C19="" C20="" C21="CIS" C22="0018586965 ||" C23="BD" C24="W/DE/BD" C25="EX-DIRECTORY" C26="" C27="/" C28="CIS Home Rescue" C29="CIS Home Rescue Plus Insd" C30="Homeserve Claims Management Ltd|Upon successful completion of this repair the contractor must submit an itemised and costed Homeserve Claims Management Ltd Job Sheet." N1="79.9000" N2="68.0000" N3="11.9000" N4="0" N5="0" N6="0" D1="2008-02-25T00:00:00.0000000-00:00" T2="EX-DIRECTORY" T4="Blocked drain" TRI_SYSID="9" TRI_RETRY="3" TRI_RETRYTIME="0" /> can anyone help me please

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  • Linq to SQL DataContext Windsor IoC memory leak problem

    - by Mr. Flibble
    I have an ASP.NET MVC app that creates a Linq2SQL datacontext on a per-web-request basis using Castler Windsor IoC. For some reason that I do not fully understand, every time a new datacontext is created (on every web request) about 8k of memory is taken up and not released - which inevitably causes an OutOfMemory exception. If I force garbage collection the memory is released OK. My datacontext class is very simple: public class DataContextAccessor : IDataContextAccessor { private readonly DataContext dataContext; public DataContextAccessor(string connectionString) { dataContext = new DataContext(connectionString); } public DataContext DataContext { get { return dataContext; } } } The Windsor IoC webconfig to instantiate this looks like so: <component id="DataContextAccessor" service="DomainModel.Repositories.IDataContextAccessor, DomainModel" type="DomainModel.Repositories.DataContextAccessor, DomainModel" lifestyle="PerWebRequest"> <parameters> <connectionString> ... </connectionString> </parameters> </component> Does anyone know what the problem is, and how to fix it?

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  • typesafe NotifyPropertyChanged using linq expressions

    - by bitbonk
    Form Build your own MVVM I have the following code that lets us have typesafe NotifyOfPropertyChange calls: public void NotifyOfPropertyChange<TProperty>(Expression<Func<TProperty>> property) { var lambda = (LambdaExpression)property; MemberExpression memberExpression; if (lambda.Body is UnaryExpression) { var unaryExpression = (UnaryExpression)lambda.Body; memberExpression = (MemberExpression)unaryExpression.Operand; } else memberExpression = (MemberExpression)lambda.Body; NotifyOfPropertyChange(memberExpression.Member.Name); } How does this approach compare to standard simple strings approach performancewise? Sometimes I have properties that change at a very high frequency. Am I safe to use this typesafe aproach? After some first tests it does seem to make a small difference. How much CPU an memory load does this approach potentially induce?

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  • converting linq query to icollection

    - by bergin
    Hi there. I need to take the results of a query: var query = from m in db.SoilSamplingSubJobs where m.order_id == id select m; and prepare as an ICollection so that I can have something like ICollection<SoilSamplingSubJob> subjobs at the moment I create a list, which isnt appropriate to my needs: query.ToList(); what do I do - is it query.ToIcollection() ?

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  • linq groupby in strongly typed MVC View

    - by jason
    How do i get an IGrouping result to map to the view? I have this query: var groupedManuals = manuals.GroupBy(c => c.Series); return View(groupedManuals); What is the proper mapping for the ViewPage declaration? Inherits="System.Web.Mvc.ViewPage<IEnumerable<ProductManual>>"

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  • Optimize LINQ Query for use with jQuery Autocomplete

    - by rockinthesixstring
    I'm working on building an HTTPHandler that will serve up plain text for use with jQuery Autocomplete. I have it working now except for when I insert the first bit of text it does not take me to the right portion of the alphabet. Example: If I enter Ne my drop down returns Nlabama Arkansas Notice the "N" from Ne and the "labama" from "Alabama" As I type the third character New, then the jQuery returns the "N" section of the results. My current code looks like this Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) Implements System.Web.IHttpHandler.ProcessRequest ' the page contenttype is plain text' HttpContext.Current.Response.ContentType = "text/plain" ' store the querystring as a variable' Dim qs As Nullable(Of Integer) = Integer.TryParse(HttpContext.Current.Request.QueryString("ID"), Nothing) ' use the RegionsDataContext' Using RegionDC As New DAL.RegionsDataContext 'create a (q)uery variable' Dim q As Object ' if the querystring PID is not blank' ' then we want to return results based on the PID' If Not qs Is Nothing Then ' that fit within the Parent ID' q = (From r In RegionDC.bt_Regions _ Where r.PID = qs _ Select r.Region).ToArray ' now we loop through the array' ' and write out the ressults' For Each item In q HttpContext.Current.Response.Write(item & vbCrLf) Next End If End Using End Sub So where I'm at now is the fact that I stumbled on the "Part" portion of the Autocomplete method whereby I should only return information that is contained within the Part. My question is, how would I implement this concept into my HTTPHandler without doing a fresh SQLQuery on every character change? IE: I do the SQL Query on the QueryString("ID"), and then on every subsequent load of the same ID, we just filter down the "Part". http://www.example.com/ReturnRegions.axd?ID=[someID]&Part=[string]

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  • LINQ statement as if condition

    - by dotnetdev
    I saw a piece of code which was written like this: if (from n in numbers select n where n = 5) However, I tried writing something like this but came across errors (bare in mind the code sample may not be exactly as above as I am typing from memory). How can I write code like the above? Thanks

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  • Using linq select to provide a grid datasource, properties are read-only

    - by Kelly
    I am using the return from the following call as the datasource for a grid. public object GetPropertyDataSourceWithCheckBox( ) { return ( from p in LocalProperties join c in GetCities( ) on p.CityID equals c.CityID orderby p.StreetNumber select new { Selected = false, p.PropertyID, p.StreetNumber, p.StreetName, c.CityName } ).ToList( ); } I get a checkbox in the grid, but it is READ-ONLY. [For the record, the grid is DevExpress.] Is there a way around this, short of creating a non-anonymous class?

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  • AutoMapper and Linq expression.

    - by Raffaeu
    I am exposing the Dto generated from AutoMapper to my WCF services. I would like to offer something like that from WCF: IList GetPersonByQuery(Expression predicate); Unfortunately I need back an expression tree of Person as my DAL doesn't know the DTO. I am trying this wihtout success: var func = new Func<Person, bool>(x => x.FirstName.Contains("John")); var funcDto = Mapper.Map<Func<Person, bool>, Func<PersonDto, bool>>(func); Console.WriteLine(func.ToString()); Console.WriteLine(funcDto.ToString()); THe error that I get is: ----> System.ArgumentException : Type 'System.Func`2[TestAutoMapper.PersonDto,System.Boolean]' does not have a default constructor Do you have any suggestions?

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  • Join with ADO.NET Linq to Entity in C#

    - by aladdin
    Hello I'm try to migrate a system to ADO.NET Entity I have 3 table A => (Id, Name, ...) B => (Id, Domain, ...) c => (IdA, IdB) VS.NET generate 2 entity A and B and both have reference to the other table but this reference is a collection. I need make a join between tables. from a in A join b in B on a.? equal b.? where condition select new { Name = a.Name, Domain = b.Domain }; I cant do that follow the reference in entity bu when the problem grows can be a problem. Any Help?

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