C# - Transfer LINQ To SQL Results To An External Dll?
Oct 8, 2009
Before LINQ I would have my main application return the results of a SQL query into a dataSet. I would then transfer the dataset as a parameter to the external dll. Now I am bringing through a LINQ to SQL query that is returned as an IQueryable(Of vClientTable) object. I want to be able to transfer that set of vClientTable results to my external dll in order for the dll to work with the data included in the results.
I am probably doing it all wrong as well as trying to do it all wrong, but would like some advice on what would be the best method to use.
DB Query
Public Shared Function getClientData(ByVal clientID As Int32) As IQueryable(Of vClientTable)
Try
Dim r = From p In dbLINQ.vClientTable _
[Code]....
Obviously in the external dll it has no idea what an IQueryable(vClientData) object is and even if I create a dbml file and datacontext in my external project for the dll that includes the same class to the DB table/view it still says that the objects are different types.
Ok i have a query i use to parse an xml file to get an id number of a movie that allows me to get more detailed information about that movie from a database.Now the problem is the id is returned correctly with xml files stored on my hard drive (c:\desktop\movies)but when i try and parse an xml file on an external drive it dont get a hit on the <id>1123</id> node.
query Function movieID(ByVal directory) 'Get the movie name
I've got some code to try and loop through LINQ results, but it doesn't seem to be working.
HERE'S THE CODE
Public Sub ProcessRequest(ByVal context As System.Web.HttpContext) Implements System.Web.IHttpHandler.ProcessRequest ''# the page contenttype is plain text'
Just when I was thinking that I had Linq To Xml sussed I'm faced with yet another error! I think if I was to understand the linq search process in general better I might have more success, so any good links regarding that are also welcome. To my problem however; using the code below:
I'm having trouble populating an object from an XML file. I've copied an example I've found almost exactly, with variable names changed, but I keep getting the "Enumeration yielded no results" exception.
Here is my code:
[code]...
Essentially, the XML query is supposed to return the title and the description for every Property which has an element called Language Code, which is equal to "en-us". I have a feeling that my problem lies in my XML code, but I've been stuck here for a long time now.
So, I'm not really sure if I have this setup properly or not. This is my first attempt at utilizing LINQ and I am trying to return data directly from an XML file.Here is my XML structure:
I want to Sum of the calculated column Red which is calculated in the Function IsRed() that return an integer.When I run the query I get the following error: Method 'Int32 IsRed(Int32)' has no supported translation to SQL.How should I rewrite this to get it to work.
In my application, I have a search query textbox (txtSearch) that works well with one-word queries with the following LINQ:[code]So how would I make the above query more generic (ie: able to handle any number of words in a query)?I should note that the object being queried is a List of strings pulled from an Access database. As it stands, this application only queries the database once and I'd like to keep it that way if possible.
I'm working on a form that has a few data grid views that are populated from LINQ queries, no problem there it works as it should however that sorting does not work. After doing some reading its because LINQ results do not support sorting.As I have the LINQ results already is there a way of copying the results into a dataset or datatable then binding the data grid view to that so sorting will work?
Can i merge the values returned from a LINQ query (in the next example c.day) with CDATA like...
Dim Result = <items> <%= From c In db.News Select _ <item> <day><![CDATA[<font size="30" color="#7CBEBD"><%= c.day %></font>]]></day> </item> %> </items>
'check for empty return Dim count As Integer = (From s In myEntity.employee Where employeeID = myEmployeeIDVariable).Count 'If there is a record, then process
Dim find_id = From p In dbContext.Residents _ Where p.person_name = occupant _ Select p
I then pull the first returned ID like so:
Dim building_id As String = find_building_id.FirstOrDefault.id
This works fine, except with the person has a ' in their last name, like M'arta. In this case I get a NullReferenceException.
Okay, the problem appears to be that when I am capturing the name initially from a GridView it is inserting into the value a #39 instead of ' and then LINQ is keeping things correct, so I end up with a non-match since it is attempting to match:
My application produces this error System.Data.SqlClient.SqlException: Login failed for user..This started after I added a stored proc in my dbml file. It works fine in my local enviroment, but throws that error when deploy to staging sever. the user it displays is foreign to me?
I have a VB .Net linq query that I want to return values from two tables. I currently have this: Dim query = (From c In db.Client _ Join u In db.Users _ On u.UserID Equals c.UserID _ Where (c.ClientID = 1) Select c, u).ToList query (System.Collections.Generic.List(Of )) returns several rows as expected each item containing a c and a u. How do I iterate through the queries collection?
Dim sizings = From a In db.Sizings Where a.Customer.ID = customer.ID Select a If sizings.Any Then .....
The sizings.Any line is throwing a null reference exception. I thought I was meant to use .Any to determine if there were any rows returned?isnothing(sizings) returns false.
Edit - Resolution:Don't use null objects in the LINQ Query!
I am trying to work out a LINQ query to pull items from a List, the List contains a child-nested List - which I need to query for an item, then use the resulting item in my final sort of all records returned the query.[code]...
I have the following LINQ-to-Entities query:[code]This will give me all the resident assignments for the current year/term. Then I have this LINQ-to-Entities query:[code]This will give me all the rooms. I want to iterate through the assignments and based on what room is assigned update the occupancy in reset_occupancy. I'm not 100% sure how to accomplish this. Here is my pseudo code of what I want to accomplish:[code]
I will use the Background Intelligent Transfer Service (BITS) to transfer files from a client (laptop) to a shared folder on a server within our local network.The problem is a very slow network bandwith, if we transfer a file, the other clients canīt work, all requests to other clients (application) or viewing internet pages needs a long time.My idea is to use BITS in my tool to copy/transfer a file from client to server, also I hope to get more performance for the internet requests.
I'm using server.transfer to transfer execution of a URL to a dummy page which fetches information from the database. The trouble is that the master page interacts with the session.
global.asax: Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs) ' Fires at the beginning of each request If Not (System.IO.File.Exists(Server.MapPath(Request.Url.LocalPath))) And Request.Url.LocalPath.ToLower
[CODE]...
Master page: If String.IsNullOrEmpty(CStr(Session("SessionId"))) Then
I'm getting an error : Session state can only be used when enableSessionState is set to true, either in a configuration file or in the Page directive. Please also make sure that System.Web.SessionStateModule or a custom session state module is included in the <configuration><system.web><httpModules> section in the application configuration.
I should also mention that this same master page works elsewhere in the site. Session is used throughout the site as well (not just in the master page).
I have a form that allows users to select file and then it reads the contents, parses the data and then executes a sql insert statement to add it to a database. What I am having issues with is showing real-time results. Currently, I have the import operation take place on the import form within the OnLoad event. The problem with this is it only shows the final results instead of the results real-time. Is there anyway to do this without creating a seperate thread and delegates?
I wanted to know if it is possible to Zip a folder without any external dll nor any external references - just with native features.I've been able to Zip files with System.IO.Packaging, but it does not include folders and I cannot tell it to Zip the parent folder.I know there are external dll and so, but I'd like to know if it's possible to make it from a native way.
