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Vb.net Datatable -> if statement to check if the value exists then amend the table

Posted on 2014-02-05
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Last Modified: 2014-02-05
Hi ALL,

Below if the code i have so far and I have 2 questions really....

1) i have an error "BC30311: Value of type 'System.Collections.Generic.IEnumerable(Of System.Data.DataRow)' cannot be converted to 'Boolean'." on row If scorestable.Rows.Cast(Of DataRow)().Where(Function(n) n("Score").ToString() = thescorestext then


2) Can i do this with less code and make it quicker/neater?

I have commented the below code to show what i wanted it to do....

      
 	'Check to see if anyrows in HomeTeam contain a value
	 Dim count = scorestable.Rows.Cast(Of DataRow)().Where(Function(n) n("HomeTeam").ToString() = StringOutNumbers(div.selectSingleNode(".//td[@class='home']").InnerText)).Count()
'Find the count
if count = 0 then

'add row to the datatable as no results where found
scorestable.Rows.Add(StringOutNumbers(div.selectSingleNode(".//td[@class='home']").InnerText), div.selectSingleNode(".//td[@class='time']").InnerText.Trim().Substring(0, 2) , thescorestext)

else
'A matching result was found so now check to see if the Scores section of the result matches the value - thescorestext

If scorestable.Rows.Cast(Of DataRow)().Where(Function(n) n("Score").ToString() = thescorestext then
'Yes it does match the score so we just need to update the column of the row with the correct time
Dim scoresRow() As Data.DataRow
'Make sure i have selected the correct team
scoresRow = scorestable.Select("HomeTeam = StringOutNumbers(div.selectSingleNode(".//td[@class='home']").InnerText)")
'Update the time row'
scoresRow(0)("Time") = div.selectSingleNode(".//td[@class='time']").InnerText.Trim().Substring(0, 2)

else

'The score does not match meaning i need to update both the score and the time

Dim scoresRow() As Data.DataRow
'Make sure i have selected the correct team
scoresRow = scorestable.Select("HomeTeam = StringOutNumbers(div.selectSingleNode(".//td[@class='home']").InnerText)")
'update score
scoresRow(0)("Score") = thescorestext
'Update time
scoresRow(0)("Time") = div.selectSingleNode(".//td[@class='time']").InnerText.Trim().Substring(0, 2)
end if

end if

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Question by:runnerjp2005
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3 Comments
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 2000 total points
ID: 39835405
Hi runnerjp2005;

In the following If statement the test needs to return a Boolean type.

If scorestable.Rows.Cast(Of DataRow)().Where(Function(n) n("Score").ToString() = thescorestext then

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The Test
scorestable.Rows.Cast(Of DataRow)().Where(Function(n) n("Score").ToString() = thescorestext

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is missing a ")" at the end of the statement. But even if you put a ")" it returns a Collection of DataRows and NOT a Boolean. You need to change the statement so that it returns a Boolean something like the following.
scorestable.Rows.Cast(Of DataRow)().Where(Function(n) n("Score").ToString() = thescorestext).Count > 0

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Author Comment

by:runnerjp2005
ID: 39835508
now i get  Identifier expected on scoresRow = scorestable.Select("HomeTeam = StringOutNumbers(div.selectSingleNode(".//td[@class='home']").InnerText)")
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LVL 83

Expert Comment

by:CodeCruiser
ID: 39835706
Try following


scorestable.Rows.Cast(Of DataRow)().Where(Function(n) n("Score").ToString())(0)("Score") = thescorestext

Another option is to use dataview

scorestable.DefaultView.RowFilter = "Score='" & thescorestext & "'"
if scorestable.DefaultView.Count > 0 Then
   'score found
else
   'not found
End If
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