A valid data source must implement either ilistsource or ienumerable

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Not clear why following code returns "A valid data source must implement either IListSource or IEnumerable"

public class CGroup<TKey, TValue> 
{
  public TKey Key { get; set; }
  public IEnumerable<TValue> Values { get; set; }
}

//AIT is declared class
var cg = new CGroup<string, AIT>();
cg.Key = "Key Value";
//line below raises error, also tried new List<AIT>();
//Empty list is fine
cg.Values = new List<AIT>(){};
aRepeater.DataSource = cg;
aRepeater.DataBind();

Appreciate any input

What I have tried:

I tried declaring an empty list for cg.Values in different ways but still errors.

Posted 6-Apr-17 2:44am

RjBFlorida

Updated 12-Apr-17 2:52am

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Comments

Tomas Takac 6-Apr-17 8:53am

Try this: aRepeater.DataSource = cg.Values;

2 solutions

Solution 2

it should be

aRepeater.DataSource = cg.Values;

since Values property gives the List which is of type IEnumerable interface

Posted 6-Apr-17 2:54am

Karthik_Mahalingam

Updated 6-Apr-17 2:56am

v2

Comments

RjBFlorida 6-Apr-17 9:01am

Thanks for response, however it's the line above that errors:
cg.Values = new List<ait>(){};

Karthik_Mahalingam 6-Apr-17 9:05am

i have checked, it works fine in that line, might be you are missing something

what is the actual value you are assigning to it

CHill60 6-Apr-17 9:16am

Are you sure you are debugging the right source or the error message is actually as you have stated it. The line of code you are indicating as the error and the error message do not match up. The error message with the line after that makes perfect sense

RjBFlorida 12-Apr-17 8:50am

Yes, seems like the error message is for the line below it but that's where VS stops and points the error at during debugging.

Karthik_Mahalingam 12-Apr-17 9:12am

is the issue fixed?

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RjBFlorida · Accepted Answer · 2017-04-12T02:52:00

Solution 3

Unfortunately, I couldn't find the solution for this so instead of trying to create an empty datasource with a key value (was hoping the key value would display "empty" in the list), I instead set the datasource to null and used labels to display "empty".

Posted 12-Apr-17 2:52am

RjBFlorida