CODEWITHSUNDEEP
c#asp.netlinq
Ubaid Ashraf
Ubaid Ashraf

Reputation: 885

Filtering DataTable and not able to handle empty result

I am filtering data from datatable using linq, it is working fine, except when search criteria doesn't match, the resultant table is not handled for emptiness. Below is my code:

var table = dtTokensInfo.AsEnumerable()
                  .Where(r => r.Field<string>("tokenName").Contains(txtTokenName.Text))
                  .CopyToDataTable();

I want table to contain values as filtered from dtTokensInfor, but am not able to handle it when search criteria doesn't match

Upvotes: 0

Views: 89

Answers (1)

Steve
Steve

Reputation: 216348

You should detach the call to CopyToDataTable from the result of the Linq expression

DataTable table = null;
var temp = dtTokensInfo.AsEnumerable()
              .Where(r => r.Field<string>("tokenName")
              .Contains(txtTokenName.Text));

if(temp != null)
   table = temp.CopyToDataTable();

If you look at the MSDN page about CopyToDataTable IEnumerable extension you will notice this between the possible exceptions thrown

ArgumentNullException: The source IEnumerable(Of T) sequence is Nothing and a new table cannot be created.

Upvotes: 1

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