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 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?
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 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?
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...
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?
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.
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]....
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?
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.
I have defined an ODBC Command and ODBCdatareader as follows
OdbcConnection myConnection = new OdbcConnection(connectionString);
OdbcCommand myCommand = new OdbcCommand();
myCommand.Connection = myConnection;
myCommand.CommandText = "select UOPGM from GREG.TUSROPTF";
OdbcDataReader myReader;
myConnection.Open();
myReader = myCommand.ExecuteReader();
When I try to retreive from the reader as follows:
while (myReader.Read())
{
string someString = myReader["UOPGM"];
lstNames.Items.Add(someString);
}
I get the following error
Error reading the database. Unable to cast object of type 'System.Byte[]' to type 'System.String'."
I have also tried string someString = (string)myReader["UOPGM"]; to no avail
If you right click on (e.g. a photo) and go to Properties > Details, you might get the following info:
Title
Subject
Rating
Tags
Comments
Authors
Date Taken
Program Name
Date Aquired
Copyright
Image ID
Dimensions
Width
Height
Horizontal resolution
Vertical resolution
Bit depth
Compression
Resolution unit
Color Representation
Compressed bits/pixel
Camera maker
Camera model
F-stop
...
Date created
Date modified
...
Computer
how to retrieve this file information in ASP.NET? I am building an upload page and want to retrieve more information than just the basic file-name, file extension etc info. I am coding in VB. It is written into the file itself so it must be possible to access this information somehow. However, my search efforts so far have not got me very far...
I have this error "The given value of type String from the data source cannot be converted to type datetime of the specified target column." when I used sqlbulkcopy to do the transaction
Here is my code:
[code]....
I'm trying to get a value from a database and I'm getting an error, see code below:
[Code]....
I get and error when I'm trying to convert the value out of the stored procedure to the string SNAME. Error is as follows:
'Conversion from type 'DBNull' to type 'String' is not valid.'
and the stored procedure is as follows:
[Code]....
I get the error - Conversion from type 'DBNull' to type 'Integer' is not valid. - on the line.....
Dim newid As Integer = e.Command.Parameters("@latestRowId").Value.........in vb code behind.
I have the identical code for another page with the exception of the field names and it works fine. The only thing I did differently, as far as I know, is I copied the asp and code behind from the page that works into this page and manually changed the field and table names. I don't know what the problem is. Does anyone see any problems?
[Code]....
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 am making a website to store invoices so i can mail them to clients. So i got a table for clients, invoices and one with invoice products/services. When an invoice has no products/services added to them and it returns null i get the error "the null value cannot be assigned to a member with type System.Decimal which is a non-nullable value type."
I just started with linq. Before i always used mysql. Mostly i just had to call data from 1 table so forgive me if my linq query isn't really correct.
Dim invoices = From i In db.invoices _
Group Join p In db.products On i.id Equals p.invoiceId Into invoiceProducts = Group _
Select New With {i.client.naam, i.titel, (From iP In invoiceProducts Select iP.prijs).Sum}
i show the client's name, the title of the invoice and the total amount the clients will need to pay for products and services.
When I used the (way #1) below I could retrieve search result from my DB
Way #1:
[Code]....
But When I use( way#2) "separating my code to Presentation layer and data access layer ( using SQL HELPER CLASS )"
Way # 2
Presentation layer: protected void btn_Search_Advance_Click(object sender, EventArgs e)
[Code]....
data access layer:
[Code]....
I keep getting this error: Procedure or function 'SP_Search' expects parameter '@SEARCHTYPE', which was not supplied.
I'm quite new to ASP.NET and i was wondering if someone could answer some of my questions.1. What is the difference between a DataTable and an Array? Is the DataTable a serverside control? Is it exposed to the user?2. Does the reader retrieve the column names? If so- how can I capture them? Are they the first row?2. Is it possible to populate an Array using the following sort of code, and if so- how?:
SqlCommand tableCommand = new SqlCommand();
SqlConnection tableConnection = new SqlConnection();
tableCommand.Connection = tableConnection;
[code]...
iam using asp.net with c#
iam saving two images in database but while retreving only one image is displaying
can you correct my code
[Code]....
I try to use one Calendar, i have example with XML, but i wont to read from SQL,
[Code]....
I am trying to retrieve a Guid from the database but my application just isnt having it. I have a field in the database called "LoginUserId" and it is of type "uniqueidentifier".In my User Model I have:
[Code]....
I keep getting the error: Specified cast is not valid.
I'm new to asp.net, php had this function that could store sql date in an array, I can't find something similar in .net, so this is what I came up with so far.
Sub Compareid()
Dim queryString As String = "Select top 2 id from my_videos order by id desc"
using connection As New SqlConnection(ConfigurationSettings.AppSettings("sqlacct")
[code]...