how to solve this error Unable to cast object of type 'System.Data.EnumerableRowCollection`1[System.Data.DataRow]' to type 'System.Data.EnumerableRowCollection`1[System.Data.DataRow]'.

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Hi ,

I am using Visual Studio 2013 ultimate, i have dataset and it contains values.when i try to get the RegID column value alone i get the below error .RegID column does not have null value
"Unable to cast object of type 'System.Data.EnumerableRowCollection`1[System.Data.DataRow]' to type 'System.Data.EnumerableRowCollection`1[System.Data.DataRow]'."

My code is

string StrRegID = string.Join(";", (from DataRow objRow in objSet.Tables[0].AsEnumerable() select objRow.Field<long>("RegID").ToString()).ToArray());

Posted 2-Jul-14 3:30am

ManiKandanSekar

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ZurdoDev 2-Jul-14 9:59am

Looks like you're trying to do too much in one line. Break it out so that it makes more sense and then you'll see where the error is.

member33 2-Jul-14 16:54pm

try this

tring.Join(";", (from DataRow objRow in objSet.Tables[0].AsEnumerable() select objRow.Field("RegID").ToString()).ToList().ToArray());

Matt T Heffron 2-Jul-14 19:34pm

Adding the .ToList() before the .ToArray() is nonsense.
Both take an IEnumerable<T> and build the corresponding collection.

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Matt T Heffron · Answer 1 · 2014-07-02T13:40:00

Solution 1

Why do you have the .AsEnumerable()?
From docs:

The AsEnumerable<TSource>(IEnumerable<TSource>) method has no effect other than to change the compile-time type of source from a type that implements IEnumerable<T> to IEnumerable<T> itself.

Posted 2-Jul-14 13:40pm

Matt T Heffron