DataBinder.Eval in c#

c# eval databinder
jestges picture jestges · Apr 14, 2010 · Viewed 17.7k times · Source

Hi anybody know how to use databinder.eval in c#

Actually I've tried this

LinkButton lnkName = new LinkButton();
lnkName.CommandArgument = DataBinder.Eval("object","<%#COURSE_ID%>");

it is showing error. Whats the wrong with this?

Answer

kemiller2002 picture kemiller2002 · Apr 14, 2010

You can't use Eval in the code behind of an aspx page.

this:

lnkName.CommandArgument = DataBinder.Eval("object","<%#COURSE_ID%>");

should be this:

lnkName.CommandArgument = YOUR_OBJECT_PROPERTY_HERE;

To fill in YOUR_OBJECT_PROPERTY_HERE you either need to specify the object.property etc like normal in C# code, or you'll have to use reflection to get the property value from the object (which is what eval does for you).

Here is a link showing how to use reflection to get the property information from an object. You can use it to duplicate how eval works if you need to: https://web.archive.org/web/1/http://articles.techrepublic%2ecom%2ecom/5100-10878_11-6099345.html

Link to DataBinder Eval Method: http://msdn.microsoft.com/en-us/library/4hx47hfe.aspx

How the DataBinder Eval Method works (and why the author thinks it should be avoided) http://weblogs.asp.net/jgalloway/archive/2005/09/20/425687.aspx

Related questions

Accessing object property as string and setting its value

I have an instance of the Account class. Each account object has an owner, reference, etc. One way I can access an accounts properties is through accessors like account.Reference; but I would like to be able to access it …

Read More
How can I evaluate a C# expression dynamically?

I would like to do the equivalent of: object result = Eval("1 + 3"); string now = Eval("System.DateTime.Now().ToString()") as string Following Biri s link, I got this snippet (modified to remove obsolete method ICodeCompiler.CreateCompiler(): private object Eval(string sExpression) { …

Read More
HyperLink with NavigateUrl with Eval(). Where is the mistake?

First I was changing HyperLink.NavigateUrl in code-behind on Page_Load(). But after I decided to do it in design using Eval() method. <asp:HyperLink runat="server" NavigateUrl='<%# String.Format("~/Refuse.aspx?type={0}&id={1}", Eval("type"), …

Read More