ADO.NET :: Bind To Navigation Properties?
Aug 5, 2010
I warking with EF 4 in vs 2010 with asp.net application.
In my page I put detailsview which connet to objectdatasource.
I want to bind navigate property to text in murkup like this:
<asp:TextBox
ID="txt_legalStatus"
runat="server"
Text='<%# Databinder.Eval(Container.DataItem,"legal_status_codes.Term")
%>'></asp:TextBox>
according to this article (from o'reilly book)
Using the Entity Framework in n-Tier ASP.NET Applications which write by julie lerman in section "Example 21.10. A TemplateField, which can be used for navigation properties".
When I run the application I get a Compilation Error "The name 'Databinder' does not exist in the current context" someone can tell me what my mistake?
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Similar Messages:
Aug 5, 2010
I warking with EF 4 in vs 2010 with asp.net application. In my page I put detailsview which connet to objectdatasource. I want to bind navigate property to text in murkup like this:
<asp:TextBox
ID="txt_legalStatus"
runat="server"
Text='<%# DataBinder.Eval(Container.DataItem,"legal_status_codes.Term")
%>'></asp:TextBox>
according to
this article (from o'reilly book)
Using the Entity Framework in n-Tier ASP.NET Applications which write by julie lerman in section "Example 21.10. A TemplateField, which can be used for navigation properties". When I run the application I get a exception "The ObjectContext instance has been disposed and can no longer be used for operations that require a connection" someone can tell me what its not working?
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Nov 17, 2010
My entity model was generated from the existing database. There is a many-to-many junction table picked up and hidden by EF.
The relationship is definitely working because this query returns 2 users as expected.
public IQueryable<User> FindUsersByGroupID(int group_id)
{
return db.Users.Where(u => u.Groups.Any(g => g.Group_ID == group_id));
}
But when locating a user that is part of the above result set the Groups navigation property count is 0. I shouldn't have to explicitly join.. right?
public User FindUserByID(int id)
{
return db.Users.First(u => u.User_ID == id);
}
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Jan 29, 2010
Is there a way to get ADO.NET Entity to generate 1:1 navigation properties? If I do foreign keys I always get 1:N navigation properties.
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Oct 1, 2010
I've been learning MVC 2 and I have pretty much everything understood except for the model part of things, I understand what the model is but actually implementing it has me confused.
Here's my situation, I have my DB which has 3 tables;
Ideas - table of ideas
Tags - table of tags
IdeaTag - link table connecting the above 2 tables via FKs
So when using the Entity Framework (.edmx) designer in VS2010 I get 2 classes created in the Designer, which obviously map to my DB tables and Navigation Properties in Idea for Tags & Idea for Tag.
So this is all fine until I actually try to add tags to an idea, what's the best practise for dealing with Navigation Properties? I wanted to add a Textbox which will then map to the Tags property in the Idea class but I'm unsure how I'd go about this.
Most of the MVC tutorials which discuss EF or Linq to SQL are quite basic.
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Apr 4, 2011
I have an EntityDataSource I've mapped to the entity Resident which includes two navigation properties (Building1, Room1). I've set my GridView to use this EntityDataSource and set the EntityDataSource Include property to Building1, Room1 so it includes these navigation properties and have added these columns to the GridView. When I run the application instead of displaying the associated navigation property it shows this: webHousingAdmin.BuildingHow can I get it to display the actual value? Code looks like this for GridView:
<asp:TemplateField>
<ItemTemplate>
<asp:Label ID="lbl1" runat="server" Text='<%# Bind("Building1") %>' />
</ItemTemplate>
</asp:TemplateField>
I've gotten it to display the actual value by using the following code:
<asp:TemplateField HeaderText="Building">
<ItemTemplate>
<asp:Label ID="lblBuilding" Text='<%# Bind("Building1.building_name") %>' runat="server" />
</ItemTemplate>
</asp:TemplateField>
But is there a simpler way to do this? This only displays the text, doesn't let me edit it...if I can do it as a boundfield that would be ideal.
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Feb 17, 2011
I'm a junior ASP.NET developer comes from Java background, so may be my question is strange.
I want to build an ascx (asp control) which accept an object as parameter for example :
1- we have a class called Device ( Contains some properties name, color , Specification (another object))
2- we have a control DeviceItem ( Contains Table to view some of the Device properties value ) and contains a property called Device
if the devices object retrieved from the Database and we have an object called device1 from Type Device
is there a direct way to pass the Device object (device1) to the DeviceItem control, some thing like :
<uc1:DeviceItem ID="DeviceItem1" runat="server" Device="THE_DEVICE_OBJECT"/>
and then bind this object to the controller, to show some properties value?
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Mar 4, 2010
Is it possible to insert information into the gridview's pager, like "Showing 10 of 55 items (You are on page 3)" and bind that information accordingly to the actual PageCount and PageSize properties?
I can only think of doing it outside the pager, even outside the GridView.
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Aug 25, 2010
Iam using masterpage and i want to use navigation menu ,but i don't want to use sitemap concept
how to work with navigation menu and assign the pages in navigation menu in master page
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May 19, 2010
I'm developing a Portal to a school
I need to login (ok)
I also need when the login is ok, to add some buttons to navigation menu, taht is created in the Master Page.
Is it possible?, how?
i already handle the page load on the default page.
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Nov 3, 2010
I have a new VS2010 .NET 4.0 Web project and the Properties Folder has gone wierd on me. It has lost teh "Open" under the right click. There is no way to get a Settings file created now.
I am unable to get to the Settings grid and no Settings file is created. I tried the help and it has the normal trip of select Properties, Open (right click), Settings Tab, etc. etc.
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Mar 3, 2010
I am relatively new to ASP.NET. I am just wondering if there is way to read values from properties file (similar to rading a properties file from JSP or java).
For example if a property file has something similar to this:
[Code]....
I would like to read all the values for username_list (comma seperated) and also the value of is_valid.
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Sep 6, 2010
I have a bunch of controls like the following in the EditItemTemplate of a ListView, with LINQDataSource:
[Code]....
I'm curious to know why the database won't update on the click of the Update button:
[Code]....
According to all I've read, the above code should be sufficient. Since CommandName is set to Update, it would seem that no code-behind is necessary.
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Oct 13, 2013
I have connected listview by using datasourceid that means by using "sqldatasource1" now i want to change value of listview at run time according to search so for that i am using datasource at codebehind. but it give an error
"listview have already bind with datasourceid you can not bind it with datasource"
what should i do for solving my requirement.
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Aug 27, 2010
i am using ajaxtoolkit:combobox and i tried to bind data to this control in code behind file.but it is taking 3 to 4 mints to bind data and display the page. I am providing my aspx code and code behind code here
[Code]....
Code behind code:
[Code]....
GetPrograms() method will return almost 6000 records. to load the control it is taking almost 4 minuts..
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Nov 8, 2010
I used below code in ASp.NET web forms code behined. Its passing parameter in the URL to which which page I am on so that I make HTML and add ON CLASS to show the page I am on.
How I solve this in MVC?. Any clean approach.
[Code]....
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Apr 1, 2010
i want to make navigation bar with items i will select them as (category,Product,....) So i made stored to get them throught paramater will pass it,s value from query string as.
ALTER Proc Navcategory
(
@Category_Id Int
)
As
Select Distinct Categories.Category,Categories.Category_Id
From Categories
Where Category_Id=@Category_Id
and i mentioned in cs
as
if (Request.QueryString["Category_Id"] != null)
{
Banar.ImageUrl = "Handlers/Banner.ashx?Category_Id=" + Request.QueryString["Category_Id"] + "";
using
(SqlConnection conn = Connection.GetConnection())
{
SqlCommand cmd = new SqlCommand();........................
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Jan 14, 2010
I will have a web site which include serveral functions for a training coudrse. For example,
1. Search the course
2 . Register the course.
What I want is to show the current status in the left pane of the browser. for example, if the user is searching the course, then in left pane "serach course" Will be highlighted. If the user is registering the course, then in left pane "registering course" will be highlighted.
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Sep 13, 2010
I have a login module in my webpage from where i want to redirect every user to a common page but their accessibility should vary on the same page,..some of them should get 10 links on that page whilw some should get 20 links on the same page...
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Jul 1, 2010
In the application i come to products.aspx from five different pages.I have back button on the products.aspx page.How find from which page user navigated to products.aspx
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Jan 4, 2011
i've been looking everywhere to find a good tutorial on building a simple breadcrumb navigation for my application. I know that MVC 2.0 can do this very easily but for my application it needs to be in 1.0 as that is what is used at the University. Could anybody point me in the right direction as I seem to be spending way too much time for something that is supposed to be a simple add on.
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Mar 22, 2010
I have a question for the navigation and I don't know how. For example when the users access the product page, on the top of the page it will display home > product, if the user access one product in the pens category, it will display home>product>pens.
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Jan 27, 2010
Anyone know how to create a menu like the thegatesnotes.com ? Can we custamize the treeview control like that?
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Jan 11, 2011
I am putting a navigation menu with in a div but the menu in aligned correctly. I want it to aling to top but it is being placed at the bottom.
Here is the script:
<%@ Master Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=EmulateIE7" />
<title>Super Dream Mattress Co. </title>
<meta name="description" content="Super Dream Mattress Co. - Scorland only Memory Foam Mattress Manufacturer. We Manufacture Foam Toppers, Double Mattresses, Single Mattresses and Kingsize Mattresses. Free next day delivery on items, contact us online or call
0141 810 4333" />
<meta name="keywords" content="memory foam mattresses, memory foam toppers, memory foam double mattress, memory mattress, memory foam mattresses, Super Dream Mattress Co, Superdreammattressco" />
<script type="text/javascript" src="script.js"></script>
<link rel="stylesheet" href="style.css" type="text/css" media="screen" />
<!--[if IE 6]><link rel="stylesheet" href="style.ie6.css" type="text/css" media="screen" /><![endif]-->
<!--[if IE 7]><link rel="stylesheet" href="style.ie7.css" type="text/css" media="screen" /><![endif]-->
<style type="text/css">
.newStyle1
{
font-family: Arial, Helvetica, sans-serif;
font-size: medium;
}
</style>
</head>
<body>
<div id="art-page-background-simple-gradient">
</div>
<form id="form1" runat="server">
<div id="art-main">
<div class="art-Sheet">
<div class="art-Sheet-tl">
</div>
<div class="art-Sheet-tr">
</div>
<div class="art-Sheet-bl">
</div>
<div class="art-Sheet-br">
</div>
<div class="art-Sheet-tc">
</div>
<div class="art-Sheet-bc">
</div>
<div class="art-Sheet-cl">
</div>
<div class="art-Sheet-cr">
</div>
<div class="art-Sheet-cc">
</div>
<div class="art-Sheet-body">
<div class="art-Header">
<div class="art-Header-png">
</div>
<div class="art-Header-jpeg">
</div>
<div class="art-Logo">
<h1 id="name-text" class="art-Logo-name">
<a href="~/Default.aspx">
Super Dream Mattress Co.</a></h1>
<div id="slogan-text" class="art-Logo-text">
Dreams in Comfort</div>
</div>
</div>
<div class="art-contentLayout">
<div class="art-sidebar1">
<div class="art-Block">
<div class="art-Block-body">
<div class="art-BlockHeader">
<div class="l">
</div>
<div class="r">
</div>
<div class="art-header-tag-icon">
<div class="t" >
Menu</div>
</div>
</div>
<div class="art-BlockContent"
<div class="art-BlockContent-body">
<div class="cleared" >
<asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1"
StaticDisplayLevels="3" valign="top">
<StaticMenuItemStyle VerticalPadding="0px" />
</asp:Menu>
<asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" />
</div>
</div>
</div>
<div class="cleared">
</div>
</div>
</div>
<div class="art-Block">
<div class="art-Block-body">
<div class="art-BlockHeader">
<div class="l">
</div>
<div class="r">
</div>
<div class="art-he
<div class="t">
Highlights</div>
</div>
</div>
<div class="art-BlockContent">
<div class="art-BlockContent-body">
<div>
<p>
Super Dream Mattress Co. become members of the National Bed Federation.</p>
<p>
<img alt="Super Dream Mattress Co. become member of the NBF" class="style2"
src="images/nbf_logo.gif" align="middle"
style="z-index: auto" /></p>
<p>
<br />
</p>
</div>
</div>
</div>
</div>
</div>
<div class="art-Block">
<div class="art-Block-body">
<div class="art-BlockHeader">
<div class="l">
</div>
<div class="r">
</div>
<div class="art-header-tag-icon">
<div class="t">
Contact Info</div>
</div>
</div
<div class="art-BlockContent">
<div class="art-BlockContent-body">
<div>
<img alt="an image"
src="images/contact.jpg"
style="margin: 0pt auto; display: block; width: 95%;" />
<br />
<b>SuperDream Mattress Co.</b><br />
Unit 3a Pegasus Business Park<br />
Hillington, Glasgow<br />
Scotland, G52 4TY<br />
Email: <a href="mailto:sales@kayfoam.co.uk">sales@kayfoam.co.uk</a><br />
<br />
Phone: 0141 810 4333<br />
Fax: 0141 810 1423
</div>
<div class="cleared">
</div>
</div>
</div>
<div class="cleared">
</div>
</div>
</div>
</div>
<div class="art-content">
<div class="art-content">
<div class="art-Post-body">
<div class="art-Post-inner">
<asp:ContentPlaceHolder ID="ContentPlaceHolder2" runat="server">
</asp:ContentPlaceHolder>
</div>
</div>
</div>
</div>
</div>
<div class="cleared"
</div>
<div class="art-Footer">
<div class="art-Footer-inner">
<a class="art-rss-tag-icon"
title="RSS"></a
<div class="art-Footer-text">
<p>
Contact Us</a> |
Terms of Use</a
Trademarks</a> |
Privacy Statement</a><br />
Copyright � 2011 ---. All Rights Reserved.</p>
</div>
</div>
<div class="art-Footer-background">
</div>
</div>
<div class="cleared
</div>
</div>
</div>
<div class="cleared">
</div>
<p class="art-page-footer">
Kayfoam</p>
</div>
<div>
<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
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Dec 4, 2010
I've been tasked with managing the re-write of a very large enterprise application's UI. The existing UI was built upon an infrastructure which leverages the EntLib 3's PageFlow application block and the Web Client Software Factory. It performs horribly - part of the reason we need this upgrade so badly.
The problem is that these pageflows are very complex, using extensive conditional page transitions. When editing a data form, selection of a single value can determine not only what page you will reach when you click "Next", but whether a sub-pageflow is entered upon navigation instead, or a new pageflow is opened in parallel, etc. We deploy our UI in such a way where we control our API, but we allow certain licenses to purchase our UI code and extend/modify it as they deem fit. One of our selling points is that we allow the customer to "configure" or redefine pageflows using the VS designer.
In transitioning to MVC2 (or 3), we'd like to continue to offer configurable, conditional navigation throughout our various data entry page sequences. However, although I have developed the beginnings of our app in MVC2, I'm not sure the best way of implementing this data-entry pageflow "conversion". Sure, I've had my resources produce some solid designs - but all of them seem to require implementation of a complex controllerfactory. But one of the main attractions of MVC2 for me was its lightweight codebase and resultant performance gains - and I'm afraid that bypassing portions of MVC2 functionality by writing custom factories and the like will drastically reduce the performance of the app, making our UI refresh virtually worthless.
My initial thought was to write a custom filter that would implement the OnActionExecuted method. Every controller's primary POST methods would be marked with this attribute. Upon execution it would evaluate what view the user was on and look up the navigation event for that view in configuration. This config would have a default "next page"/"previous page" mapping, and can also allow for defining a type which would use conditional logic to determine the next page based on the posted model data. The actionfilter would use this type to find what route to navigate to next. I'd like to pick you experts' brains on this - does this seem like a solid design? Is it using best practices? And will it indeed perform better than a controller factory, or am I completely off-base here?
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