I have the follow method that returns a dynamic object representing an IEnumerable<'a>
('a=anonymous type) :
public dynamic GetReportFilesbyStoreProductID(int StoreProductID)
{
Report report = this.repository.GetReportByStoreProductID(StoreProductID);
if (report == null || report.ReportFiles == null)
{
return null;
}
var query = from x in report.ReportFiles
orderby x.DisplayOrder
select new { ID = x.RptFileID, Description = x.LinkDescription, File = x.LinkPath, GroupDescription = x.ReportFileGroup.Description };
return query;
}
I want to be able to access the Count
property of this IEnumerable
anonymous type. I'm trying to access the above method using the following code and it is failing:
dynamic Segments = Top20Controller.GetReportFilesbyStoreProductID(StoreProductID");
if (Segments.Count == 0) // <== Fails because object doesn't contain count.
{
...
}
dynamic
keyword operate?Count
property of the IEnumerable
anonymous type?IEnumerable<myObject>
instead of dynamic
? I'd prefer to not do that if I can as this method is only called in one place and creating a throw-away object seems like overkill.
You'll need to explicitly call Enumerable.Count().
IEnumerable<string> segments =
from x in new List<string> { "one", "two" } select x;
Console.WriteLine(segments.Count()); // works
dynamic dSegments = segments;
// Console.WriteLine(dSegments.Count()); // fails
Console.WriteLine(Enumerable.Count(dSegments)); // works
See Extension method and dynamic object in c# for a discussion of why extension methods aren't supported by dynamic typing.
(The "d" prefix is just for the example code - please do not use Hungarian notation!)
Update: Personally I'd go with @Magnus's answer of using if (!Segments.Any())
and return IEnumerable<dynamic>
.