vb.net - Statement lambdas cannot be converted to expression trees in Workflow Foundation 4.0 -

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i've been pulling hair out on awhile. have custom activity accepts inargument such:

[requiredargument] public inargument<func<idatareader, t>> projection { get; set; }

and later on use projection in select statement on data reader after sql query so:

results = reader.select<t>(context.getvalue(this.projection)).tolist();

now, difficult part passing func variable in vb expression. in case, t list of rawtie objects. every time try complicated expression assemble list reader, error: statement lambda functions not supported in context.

here example of expression attempted. keeping in mind vb not primary language:

function(r idatareader) new list(of rawtie)     dim ties new list(of rawtie)()      while r.read()         'do ties     loop      r.close()      return ties  end function

is there information on, @ least, whether vb problem or wwf problem? ask if need more information.


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