DataSource Controls :: Sorting A ListView Bound To LinqDataSource Based On Child Object?
Jul 22, 2010
This was a pretty disappointing moment - when databinding, using Eval("Contact.LastName") would work. It nicely evaluates the related Linq object's member LastName. If the "Contact" object is null, no error is thrown... instead the field is simply null.
However, the same does not hold for sorting - if there exists a null entry (this object does not have a Contact) then the LinqDataSource throws a NullReferenceException. This means that, if you ever have nulls on your foreign-key objects, you can't use sorting headers in the ListView.
This makes the feature moderately useless - I have to roll my own properties for every single field I'd ever want to sort on. That's insane.
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Similar Messages:
Mar 22, 2010
I am trying to populate the ListView using LinqDataSource data source but the issue I am having is.I need to load the listview on Search button click action.
IN the page_load I kept like this:
===========================================
LinqDS.Selecting += new EventHandler<LinqDataSourceSelectEventArgs>(LinqDS_Selecting);
protected void LinqDS_Selecting(object sender, LinqDataSourceSelectEventArgs e)
{
e.Result = ObjectDS;
}
=============================================
This works fine but this happens on page load,i want this binding to happen on button click?is there a way to do this?
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Feb 10, 2011
I have a FormView bound to LinqDataSource, that is intended to allow editing of a single product's details, that is selected from a GridView. The LDS has a Where parameter set to point to the GridView control (i.e. a ControlParameter).
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Feb 12, 2010
With the gridview I can create a template field to query across associations but I don't see how its possible to do that with the listview (?). I tried to create associations in the eval fields
(ie productId.Brand) where productId is in the Reviews table and is associated with the Products table - and Brand is a member of the Product table but it was no go?
[Code]....
<b>Title:</b> <%# Eval("Title") %>
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Mar 10, 2010
I am upgrading and re designing my current ASP.NET 2.0 website to ASP.NET 3.5 to take advantage of the 3.5 feature set.As part of the re design I am going to use Linq to SQL classes.
The web based application I am working on is an N-Tier application. In the past I have always used an ObjectDataSource when binding against UI controls.I just read an article about the LinqDataSource.After reading this article I am toying with the idea of using the LinqDataSource for selecting data into controls where I only want to select and not change the data (i.e. drop down list boxes or gridviews that don't perform inserts,updates or deletes).Before I go down this path,I was wondering if this is a bad idea and that I should just stick with the ObjectDataSource?
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Mar 30, 2010
I have a ListView with a LinqDataSource that's not displaying data. Here is my source code:
[Code]....
why the data won't display? As far as I can see, I've done everything right.
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Mar 5, 2010
I would like the ObjectDatasource insert and update data methods to return the inserted or updated object like LinqDataSource do.
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Feb 17, 2010
On DBML I have two entities as Parent, Child. I am trying to assign Child class properites in a Parent.
[code]....
I am getting the following Error:
Cannot access a disposed object.
Object name: 'DataContext accessed after Dispose.'.
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Dec 15, 2010
I have a problem similar to the one found in this Question I have a ListView nested inside of another listview. The outer Listview is bound to an object in the codebehind.
listViewOuter.DataSource = myObject[0].someProperty;
listViewOuter.DataBind();
Where someProperty is a List of another object(mySecondObject). The inner Listview needs to be editable and it is bound in the markup to another property(secondObjectProperty) of type List in the mySecondObject as such:
DataSource='<%# Eval("secondObjectProperty")%>'
This works fine to display the data, however I cannot figure out how to put the nested listview into edit mode. I am handling the OnItemEditing command and setting the EditIndex to the proper row however the mode of the nested LV never changes. I have tried every imaginable combination of updates panels and rebinding both the inner and outer listviews however nothing seems to work
heres the LV markup(psuedocode)
<updatePanel>
<asp:ListView ID="outerListView" runat="server">
<layouttemplate here>
<itemTemplate>
<aspListView ID="innerListView" DataSource="<%# Eval("secondObjectPropery")% onitemEditng="editMethod">
</asp:LsitView>
</itemTEmplate>
</asp:ListView>
</updatePanel
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Sep 22, 2010
I know the question has already been posted here but we didn't get to an real solution.I have bound my ListView to an SqlDataSource and I want to write some text in a control present in the view created in the LayoutTemplate depending on some properties of the rows returned.Obviously, I'm using the ItemDataBound event to feed my items but this is not the point.
The spontaneous solution was to bind the ListView.DataBound event and access the raw datasource (a DataTable?) and do the required calculations.I inspected the Items property and, despite it was not empty, the related DataItem property was null.The only work-around I can come to is to execute the calculations in the ItemDataBound event and accumulate the result in some private fields. But it's really ugly to see and makes harder to get some of the required values.
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Dec 5, 2010
I am using a ListView and i want to get my datatables sorted by clicking table headers. I am binding my ListView to DataSet via DataSource peoperty of ListView.I donot want to use ObjectDataSource or SQLDataSource Controls.
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May 31, 2010
i have one ajax accordion control and inside that i have a list view inside that control. now listview is bind to objectdatasourcecontrol.
and object data soruce control is bind to a custom class. Now the problem is that i need to naviagate to different pages on the click of the listview items or load user control...Now how to do that?. i am pasting my code here.
[Code]....
and class file which is bind to objectdatasource control
[Code]....
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Aug 17, 2010
Im trying to create LinqDataSource that will represent data from dynamically created String list and then use it as a datasource to my GridView.
List<string> users = RetreiveUsers();
LinqDataSource ds = new LinqDataSource();
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Aug 26, 2010
I am having trouble finding how to solve the following issue :
I am using nested listviews to display Sales and Sales details.
The main ListView displays General Information about Sales and the child ListView displays the detailed information about one sale. the child listview is shown only when the user clicks on a link (see included code, DataBind is made on PageLoad) :
ASPX Markup Code :
[Code]....
C# Behind Code :
[Code]....
If I removed the datapager part, I can manage show/hide the child list view on the button click event. but if I want to use the DataPager with the PreRender event handling, the child listview is not longer shown on button click.
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Jul 19, 2010
I want to sort my gridview binded to an object datasource fetching business objects. I have already implemented custom paging & now want to implement sorting. Just read this article but there is lot of concatenation going on there with the SQL Query.
[URL]
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Aug 31, 2010
I have a gridview being data bound by an objectdatasource which points to a BLL/DAL. I have paging and sorting enabled within the gridview. I have the fields configured in the look/fell I want from a templatefield. This templatefield has the sort expression (date) I want things to be sorted by. All this works as it should and I have no issues with it.But, the issue is that when I click on the header to sort asc/desc by date, I have to click on it twice for it switch to descending order. E.g. I hit the webpage and it lists all the information in the gridview, sorted by date, ascending order. If I want to sort by descending order, I have to click the date header twice in order for the gridview to sort the information in descending order; the clicks cause a post-back and the whole screen is refreshed.
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Jul 6, 2010
i need to get data-bound items from outer listview to display in inner Listview, in this scenario:
[code]....
Where the higlighted text mean the title for outer datasource.
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May 14, 2010
I have a gridview control bound to a sqldatasource in c#. In the rowdatabound event I look at a value in a cell and use a function to evaluate the value and depending on that value I populate an added unbound column in my bound datagrid to show an excalmation point. I now want to sort by the column with the excalmation point.
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Apr 2, 2011
I am trying to implement a nested user control in listview and the user control doesn't get bound.
Here is my code.
[Code]....
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Jan 5, 2010
I'm using a GridView and a LinQDataSource (Northwind database) and this error appears when website runs.
Here is my codes on aspx file and no codes in cs file.
[Code]....
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Jun 11, 2010
Im trying to build a where clause in c# for a LinqDataSource, but I cant get it to work, heres my code
[Code]....
when I set category to 'Concerts' tyhe where clause is
'Category = Concerts'
this generates an error telling me there is no column called 'Concerts'. I assume I somehow have to enclose the search term in quotes, Ive tried single and double quotes, but nothing works.
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Nov 16, 2010
So I need to take the literal "SELECT....FROM Bay....WHERE Warehouse=1 and ((BAY LIKE '1.0%' or BAY LIKE '2.0%'))I have set up a linqdatasource on my asp page and I want to bind that to a gridview. Here is the start of the HTML:
<asp:LinqDataSource
ID="dsBays"
runat="server"
ContextTypeName="CartonInventory.CartonInventoryDataContext"
EnableUpdate="True"
[code]...
How do I add a parameter so that it includes the LIKE statement?
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Oct 22, 2010
I have a grid bound to a linqed SP thus:
Session["results"] = db.spGetCaseByNumberOrSurname(txtCaseNum.Text.Trim(), null).ToList();
gvResults.DataSource = Session["results"];
on the sorting of it, i would like to be able to do this..
protected void gvResults_Sorting(object sender, GridViewSortEventArgs e)
{
string sortExpression = e.SortExpression;
List<spGetCaseByNumberOrSurnameResult> data = Session["results"] as List<spGetCaseByNumberOrSurnameResult>;
if (sd == SortDirection.Ascending)
{
sd = SortDirection.Descending;
gvResults.DataSource = data.OrderBy(d => d.GetType().GetProperty(sortExpression));
}
else
{
sd = SortDirection.Ascending;
gvResults.DataSource = data.OrderByDescending(d => d.GetType().GetProperty(sortExpression));
}
gvResults.DataBind();
}
sadly that doesnt do any sorting at all..it in fact errors with "The data source does not support server-side data paging."
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Sep 28, 2010
I have a gridview which is bound to a DataTable. When I try to sort the gridview, it goes blank. How can I enable sorting this gridview? I know this question has been asked before, but what I'm looking for is an explanation of how to do it. Perhaps with a simple example.
I have read that I need to put some code in the on_sorting and/or on_sorted events, but I don't understand what needs to go there. Again, I want to understand the method of accomplishing this, I don't just want a giant block of code.
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Jul 5, 2010
I have a ListView control that is bound to an SQLDataSource.
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