无法将类型为'System.Data.EnumerableRowCollection`1 [System.Int32]'的对象强制转换为'System.IConvertible'

Question

I am trying to store value by using code below but it is giving me error.

int dqty=  Convert.ToInt32(from row in result.AsEnumerable()
where row.Field<string>("batch_num") == k_batch.ToString() 
select row.Field<int>("qty"));

Basically i want to retrieve value of "qty".

Answer 1

Disregarding your other problems, you cant convert a list/collection to an integer

You'll need to use FirstOrDefault or similar

Enumerable.FirstOrDefault Method (IEnumerable)

Returns the first element of a sequence, or a default value if the sequence contains no elements.

Example

 int dqty = (from row in result.AsEnumerable()
              where row.Field<string>("batch_num") == k_batch.ToString() 
              select row.Field<int>("qty")).FirstOrDefault();

Update

Further exmaple

var list = new List<int>()  {23, 345, 546, 345};

var result = (
    from row in list
    where row > 23
    select row).FirstOrDefault();

Console.WriteLine(result);

Output

345

Full Demo here