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I am trying to learn how to bind an IEnumerable LINQ collection to a repeater

Answer 1

+5 A:

You're getting back an enumerable of strings with no name. If you want to use the property name driver you can make an anonymous type and say:

var result = from driver in driverNames
             orderby driver
             select new { Driver = driver };

then do the databinding.

I believe you can also Eval(".") to evaluate the object itself and not a property. Also as multiple people have said below you can use <%# Container.DataItem %>.

Orion Adrian 2009-05-06 20:30:54

var = from driver in driverNames ? where is the variable name ?var foo= from driver in driverNames , edit it guy ;)

Adinochestva 2009-05-06 20:32:07

Sorry when I try that code I get "Error 1 Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<AnonymousType#1>' to 'System.Collections.Generic.IEnumerable<string>'. An explicit conversion exists (are you missing a cast?)"

Ian Roke 2009-05-06 20:36:38

Gotta use a different name than the lower case driver I guess.

Orion Adrian 2009-05-06 20:39:02

Also there's something about using anonymous types in databinding. I'm having trouble remembering it, but I actually wrote a library for getting around it dynamically at runtime. It has to do with postbacks and them not having the same class going out as coming in. But that's only really an issue if you're editing the datasource.

Orion Adrian 2009-05-06 20:40:33

If you change your code to the above, you'll also have to change your ASP.net page to bind to Eval("Driver")

Orion Adrian 2009-05-06 20:48:35

Thanks mate I have accepted this answer as the most complete. Can you tell me why I was getting an error when I was using IEnumerable<string> result instead of var result? It was to do with a cast. If I copy the error would you be able to help me with how to get it working?

Ian Roke 2009-05-06 21:11:20

Because the databinding is looking for properties on the string object, not the value of the string. When you bind to something using Eval("Driver"), then it's going to look at the Driver property on each object. If you want just the item itself you can use Container.DataItem which represents the object in question. What you did was mix the two. You referenced it by a property, but bound it to objects that didn't have that property.

Orion Adrian 2010-04-21 16:13:33

Answer 2

A:

Because a string does not have a property called "driver" and you're using a list of strings this won't work. Try replacing the Eval statement with Container.DataItem

Jeroen Landheer 2009-05-06 20:32:18

Answer 3

A:

try

<%# Container.DataItem.ToString() %>

The eval is looking for a property named driver but you have the actuall driver name as a string. It'd be like calling "drivername".DriverName. The enumeration of your collection is working with the actual items. If you actually had a collection like IList drivers, then that would work.

Joshua Belden 2009-05-06 20:32:31

Answer 4

+3 A:

Change <%# Eval("driver") %> to

<%# Container.DataItem %>

Mehrdad Afshari 2009-05-06 20:32:35

+1 This works well as an alternative solution too. Thanks for your help.

Ian Roke 2009-05-06 21:58:25

Answer 5

A:

are you sure there is no type ? as the code looks fine.

you can also use select new { Driver = driver, DriverAge = driverage, etc..}

then in your ASPX page you use this following

<ItemTemplate>
<div class="Driver"><%# Eval("Driver") %></div>
<div class="DriverAge"><%# Eval("DriverAge ") %></div>   
</ItemTemplate>

hope this helps.

2009-05-06 20:38:34

Answer 6

A:

or simply <%# Eval("result.Driver") %>

ruhrpott 2010-02-17 14:23:14

Answer 7

A:

I realize this is an old question but I wanted to point out that a string array already is IEnumerable<string> and you could just bind the array directly to the repeater using Mehrdad's answer:

<%# Container.DataItem %>

Jamie Ide 2010-02-17 14:30:51

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I am trying to learn how to bind an IEnumerable LINQ collection to a repeater

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