Unable to get values from DataItem using 'dynamic' in c#

Question

I'm using Telerik RadGrid's NeedDataSource event to bind to a anonymous type.

Now OnItemDataBound is used to bind a DropDownList inside RadGrid.

protected void rgQuotations_ItemDataBound(object sender, GridItemEventArgs e)
{
    if (e.Item is GridDataItem)
    {
        dynamic di = e.Item.DataItem;

        DropDownList ddlStatus = (e.Item.FindControl("ddlStatus") as DropDownList);
        if (di.Status == 4)
        {
            ddlQuoteStatus.Items.Add("4");
        }  
    }
}

When it tries to get value of di.Status it throws exception

An exception of type 'Microsoft.CSharp.RuntimeBinder.RuntimeBinderException' occurred in System.Core.dll but was not handled in user code

Additional information: 'object' does not contain a definition for 'Status'

But I can clearly see the value by hover on it.

How can I get this value without getting error?

e.Item.DataItem will have the object(or row data) for the row which just bound to grid — soccer7, Feb 24 '16 at 16:12
Yes, but who creates the row instance? Same assembly or other? is it an anonymous type, ExpandoObject or something else? — Zdeslav Vojkovic, Feb 24 '16 at 16:13
Yes it's anonymous type. That's I'm trying to access it using dynamic but getting error. I have a class library separate that gets data from DB, creates anonymous type and returns back. — soccer7, Feb 24 '16 at 16:16
Possible duplicate of [C# ‘dynamic’ cannot access properties from anonymous types declared in another assembly](http://stackoverflow.com/questions/2630370/c-sharp-dynamic-cannot-access-properties-from-anonymous-types-declared-in-anot) — Zdeslav Vojkovic, Feb 24 '16 at 16:16
Then it's solved :) Some more info: http://www.heartysoft.com/ashic/blog/2010/5/anonymous-types-c-sharp-4-dynamic — Zdeslav Vojkovic, Feb 24 '16 at 16:17

score 1 · Accepted Answer · edited May 23 '17 at 12:25

1

As explained in C# ‘dynamic’ cannot access properties from anonymous types declared in another assembly, you can't use an anonymous object created in another assembly because it is internal.

As you are in control of the assembly where the object is instantiated, there is one possibe workaround (not mentioned in the linked answer, so I add the answer here). You can make the originating assembly internal types visible in the assembly which uses the object, by adding InternalsVisibleTo assembly attribute:

// in assembly where you create the anonymous object
// and assuming the assembly where you use it in Grid is called Xyz
[assembly:InternalsVisibleTo("Xyz")]

edited May 23 '17 at 12:25

Community

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answered Feb 24 '16 at 16:23

Zdeslav Vojkovic

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At what place should I add this line exactly? – soccer7 Feb 24 '16 at 16:30
Ok..I added it above the namespace. Everything is working now! Super thanks :) – soccer7 Feb 24 '16 at 16:33
Typically, it is put in properties\assemblyinfo.cs together with other assembly level attributes like file version, copyright etc, but it is not required, you can put it anywhere. – Zdeslav Vojkovic Feb 24 '16 at 21:24

Unable to get values from DataItem using 'dynamic' in c#

1 Answers1