Do any one know how to return an anonymous type. I am using Linq where i need to return the following code
private <What's the return type to be provided here> SampleLinq(Int32 Num)
{
var query = (from dept in obj.DeptTable where dept.Id == Num select new { dept.DeptName, dept.DeptId });
return (query)
}
I am consuming an RSS feed to display on my website using a repeater control. I was wondering if it's possible in VB to return an anonymous type from my linq query rather than a collection of strongly typed RSSItems. I know this is possible in C#, however haven't been able to work out a VB equivalent.
[Code]....
If I have a linq query that creates the anonymous type below:
select new
{
lf.id,
lf.name
lf.desc,
plf.childId
};
Is it possible to assign a specific type to one of the members? Specifically I would like to make lf.id a null-able int rather than an int...
I am currently implementing a client-side paging solution using ASP.NET, jQuery and JSON.
I have been following the excellent article from encosia: http://encosia.com/2008/08/20/easily-build-powerful-client-side-ajax-paging-using-jquery/
In my Web Method I retrieve my data from the database as a DataTable:
DataTable categoryProducts = ProductViewerAccess.GetCategoryProducts
("AA", 4, 0, Page.ToString(), out howManyPages, "FALSE", 0, "CostPrice", "asc", destinationList);
I then retrieve the data from the DataTable into an anonymous type:
var feeds =
from feed in categoryProducts.AsEnumerable()[code]....
This all works great.
However, I would like to extend the code to perform some evaluation checks (e.g., check that various columns in the DataTable are not NULL) and other pre-processing (e.g., call various functions to build the image URL based on the image ID - which is another column in the DataTable not shown in the code fragment) before I return the resulting rows of the DataTable as an anonymous type to the client-side.Basically, I want to iterate through the DataTable, perform the evaluation checks and pre-processing, while building my anonymous type manually as I go. Or maybe there is a better way to achieve this?
I am using .net framework 3.5 and sql server 2008.
In my project coding, I want to call stored procedures in sql server 2008.
return value is the object list which references the entity.
But I have the questions.
If in the entity named as "order", is it matching the properties or created through entity constructor??
In my case, I have two properties and one constructor which match one property.
public class orders
{
orders ( string orderid)
{
this.orderid=orderid;
}
public string orderid {get;set;}
public string orderno{get;set;}
}
I've recently inherited an ASP.NET 2.0 project from other developers and they have a LinqToSql datacontext with stored procedures. I've been asked to modify one of the SPs which is essentially just adding a couple columns to the database table and then those to parameters to the SP. So I delete the existing SP from the L2S context and drag in the new one with the additional fields, and all hell breaks loose. Suddenly I get over 20 errors! What seems to have occured is L2S has modified many other stored procedures that I haven't even touched and changed the return type from ISingleDefault<some object> to int. I've never used stored procedures before with L2S so I don't know if this is standard behavior or not. Does anyone know why this has happened and how to fix it to set the correct return type?
View 3 RepliesI am trying to fill a gridview with the data from Product table selecting few columns . I am using 3 - tier architecture and in DAL getproduct(userid) I am writing the query but cannot figure out exactly how to get that working .. here is piece of method I wrote
public List<Project> GetProjectList(int ownerId)
I am trying to figure out how to get at an anonymous typed object's properties, when that anonymous type isn't created in the current function.
Specifically, I am binding an ASP.NET ListView to LINQ resultset, then trying to process each item in the ItemDataBound event.
Option Explicit On
Option Strict On
Class MyPageClass
Private Sub Bind()
Dim items As ItemData = FetchItemData()
Dim groups = From s In items Group s By Key = s.GroupId Into Group _
Select GroupID = Key, GroupData = Group
' This works fine:
Dim groupId As Integer = groups(0).GroupID
lvGroups.DataSource = groups
lvGroups.DataBind()
End Sub
Private Sub lvGroups_ItemDataBound(ByVal sender As Object, ByVal e As ListViewItemEventArgs) Handles lvGroups.ItemDataBound
If e.Item.ItemType = ListViewItemType.DataItem Then
Dim item As ListViewDataItem = DirectCast(e.Item, ListViewDataItem)
Dim groupData = item.DataItem ' This is the anonymous type {GroupId, GroupData}
' Next Line Doesn't Work
' Error: Option Strict disallows late binding
Dim groupId As Integer = groupData.GroupId
End If
End Sub
End Class
What do I need to do in lvGroups_ItemDataBound() to get at the item.DataItem.GroupId?
Basically, I have a repeater control, and a Linq query that retrieves some items. Ordinarily I would databind straight to the query and use Eval to populate the template with the results.
However, it doesn't come through in quite the right format - for example, if EndDate is null (it's a DateTime?) then I want to substitute it with "Present". I am using only a couple of the properties in the query result objects.
I am wondering if there's a solution like:
[pseudo madeup code]
var query = getResults();
List<anonymous> anonList = new List();
foreach (var q in query)
{
string myEndDate = "";
if (q.EndDate.HasValue)
{ myEndDate = q.EndDate.ToString(); }
else
{ myEndDate = "Present"; }
anonList.items.add(new { name=q.name, enddate=myEndDate };
}
repeater.Datasource = anonList;
then
<div><%#Eval("enddate")%></div>
I use LinqToSql in my project. I have a class called MessageBLL and this class has a method called GetAll which returns List<object>. I returned object because I get data from two tables. Here is my code;
[Code]....
I want to use this in my Default.aspx.cs as like this but intellisense is not show CategoryName :[Code]....suggest me return as IQueryable but I couldn't do it in that way.
I have an asp:DetailsView with several columns, e.g. Foo, Bar.
I want to fill it with an anonymous type, i.e.:
gridView.DataSource = new { Foo = 1, Bar = "2" };
gridVeew.DataBind();
But getting next error:
Data source is an invalid type. It
must be either an IListSource,
IEnumerable, or IDataSource.
How can I do what I want?
I have controller method that looks something like this:
[Code]....
notice the commented out line. This method used to return an IEnumerable<Sport> but now that I have used a LINQ query it is returning an IEnumerable of an anonymous type (I think that's the correct terminology - please correct me if I'm wrong).
Question I have is...can I add a strongly-typed view based on this anonymous type and if not, how do I write a view that can access this collection?
Usual situation: DataList and LinqDataSource with anonymous types...
Is there any way besides reflection to retrieve properties of anonymous typed DataItem in DataList_ItemDataBound event?
I've been looking into how best to do this and wisdom would be appreciated. For read only purposes, I've been happily using LINQ and binding it to a grid. For editing purposes, I've used the LinqDataSource control, enabled the Edit/Delete operations in the process, and I have a nice editable grid bound to some or all of the table's fields.Now I have a situation where I want to edit a few fields in table A, but there are various values in linked table B that I want to display in that grid too (no editing of those). So my query looks like the below. The fields in tblDupes (cleared, notes) are what I want to edit, but I'd like to display those tblVoucher ones.
var theDupes = from d in db.tblDupes
where d.dupeGroup == Ref
select new
[code]...
A similar but different question LINQDataSource - Query Multiple Tables? sent me looking at scott Guthrie's blog entry http://weblogs.asp.net/scottgu/archive/2007/09/07/linq-to-sql-part-9-using-a-custom-linq-expression-with-the-lt-asp-linqdatasource-gt-control.aspx, where he handles various events to have a LinqDataSource with a custom query across tables. This still seems aimed at explicitly designed classes though, even if the class has only a subset of the fields.
So my question is: is there an easy way to allow committing of the changes made to the anonymous collection (a changes.Submit type action), or just an easy way to 'display' fields from another table while not involving them in the updating?EDIT: Thinking more, it doesn't have to be anonymous really. I'd be happy to define a class to contain the elements in that query, since it won't change often. But, those elements would be across two tables, even though only one needs updating. Not sure if that suggests entity framework would be more suitable - I get the feeling it wouldn't - I don't want the whole 'model' always grouping the fields in this way.
I'm using MVC, and in the controller, I'm using a linq to objects query which returns an anonymous type:
var results = from ... select new { ... };
I then pass this information to an untyped view:
return View(results);
I try to iterate through the data in the view:
<% foreach (var entry in Model)%>
...
<%: Html.Encode(entry.MyProperty) %>
However, I get a RuntimeBinderException: 'object' does not contain a definition for 'MyProperty'. However, oddly, if I hover above entry with the mouse, it does actually have MyProperty in the popup window, and the value is what I would expect,(apparently, the Visual Studio IDE knows what type it is).I can get around this problem by using a linq query which uses an explicit type and a parameterless constructor of the form:
IQueryable<SearchResult> results = from ... select new SearchResult { ... };
and creating a view model class which encapsulates the SearchResult data, which is then returned to a strongly typed view. However, I don't understand what the problem is with the first method.
Can my WebMethod return an XmlDocument as return type?
When I try to consume the web service I'm still not getting XML. It appears as though a reference to the method is being returned rather than say a string containing XML.
<WebMethod()> _
Public Function CustomerSearch(ByVal lastName As String, ByVal firstName As String, ByVal companyName As String, ByVal city As String, ByVal state As String, ByVal email As String) As XmlDocument
' Create XML doc
Dim doc As XmlDocument = New XmlDocument()
' some more code
Return doc
End Function
nested repeater like this:
<asp:Repeater ID="repeaterReportListByJob" runat="server" DataSource='<%# GetReportsByJobNID(Eval(Container.DataItem, "JobNID")) %>'>
It seems my Eval(Container.DataItem, "JobNID") is not working and I assume this is because the datasource of the outer (parent) repeater is an anonymous type. So how am I supposed to access a particular field of my anonymous type?
I have an Interface that has its concrete class defined via a factory. Because of this I found no way to use the Interface tpye directly in my LINQ quesry so I had to use the concrete class types to creat a generic list. The LINQ query works but after calling.ToList() on the LINQ query result I get a List(of MyConcreteClass), but I need a List(of IMyConcreteClass). I have tried everything I can find: .Cast, Ctype, implicit casting, etc. but I always get back one of the (2) messages (depending on if I attempt to cast)message:
"Unable to cast object of type 'System.Collections.Generic.List`1[MyConcreteClass]' to type 'System.Collections.Generic.IEnumerable`1[IMyConcreteClass]'."
...or
"Unable to cast object of type '<CastIterator>d__aa`1[IMyConcreteClass]' to type 'System.Collections.Generic.List`1[MyConcreteClass]'."
Here is the sample code:
[Code]....
I have the following:
[code]....
I keep getting this error:
Message = "The conversion of a char data type to a datetime data type resulted in an out-of-range datetime value."
What i'm trying to do is group by ContentObjectId and then get StartDate that is greater than today.
I'm using entity framwork and MS SQL2008
I'm trying to extend the GridView class to always show the header and footer even when the datasource is empty by using the code I found online (link). However, the code is written in C# but I use VB.
What is the VB equivalent of the following?
public event MustAddARowHandler MustAddARow;
Is there a way around VB.NET not allowing events to return a type?
Also, I cannot convert the following function because of the error below.
Code:
[code]....
I have a web service and its methods return a class which is name WSResult. WSResult has 2 properties. One of property's type is int and the other one's type is object. I want to return some different type with this second property.
[code]....
How can i pass an object which i retrieved from other web services or that i generated from my serializable classes inside M_ResultObject property ?
I have a method like:
public T Get<T>(string key)
{
}
Now say I want to return "hello" if the type is a string, and 110011 if it is type int.
how can I do that?
typeof(T) doesn't seem to work.
I ideally want to do a switch statement, and return something based on the Type of the generic (string/int/long/etc).
I'm using LINQ to query my database, and I don't want all the records returned all at once. Instead, user should be able to select Next 5 and Previous 5 using buttons. As of this moment I have selected the first 5 rows in the Item table in the databas like this:
private void ShowItems()
{
var items = (from p in db.Items
orderby p.ID descending
select new { ID = p.ID, Item = p.itemName,
Qty = p.quantity }).Take(5);
[code]...
I have a low level quiz. this is a mvc project
in PostRepository.cs, it has some code :
[Code]....
and then , in PostController.cs , I wanna a field in database call postStatus, the code is:
[Code]....
When I edit the post ,I hold the selectlist can show the option what is in database. But the code not work will.
then I use the Response.Write(postStatus); to test what happen. And the Browser show some code on top side :
[Code]....
I wanna what's up with the code and I want to know the suitable method.
I have create a table and create edmx file, and I create a Stored Procedure that return a single row (select by primary key), and I want the edmx to have a function that calls that SP and return a type.
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