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Update Datatable with the results of a LINQ query

Posted on 2009-06-29
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Last Modified: 2013-11-11
Not sure how/or best way to do this. I have a datatable with part of the data needed (look at code). The code works. But now I want to run another LINQ query something like this

Dim TList = From TL In dc.vwTL
          Select TL.DOD, TL.Test

and now update my Datatable with the TL.Test info.  I actually have many other columns that will need to update the datatable the same way to include calculations.  Using VB 2008 framework 3.5.  had a simular question. Thanks in advance
Dim TMDODList = From TM In dc.vwCurrent_datTMs _
                        Select TM.DOD
 
            ResultsTable = New DataTable("Results")
 
              'Create the cols for the table
            ResultsTable.Columns.Add("DOD", GetType(String))
            ResultsTable.Columns.Add("Test", GetType(Integer))
 
            For Each DOD In TMDODList
                ResultsTable.Rows.Add(New Object() {DOD})
            Next

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Question by:MadIce
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4 Comments
 
LVL 83

Accepted Solution

by:
CodeCruiser earned 2000 total points
ID: 24761476
I am not sure if i understand your question correctly but if you need to update a column value in the datatable then something like following code could be used.

This is a demo code.
for each T in TList
    ResultsTable.DefaultView.RowFilter = "Test=" & T.TestID
    If ResultsTable.DefaultView.Count = 1 Then
       ResultsTable.DefaultView.Item(0).Item("DOD") = TList.DOD
    End If
    ResultsTable.DefaultView.RowFilter = ""
Next

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Author Comment

by:MadIce
ID: 24764376
CodeCruiser,
It looks like your example will work but I get an error on the the second line (for the Rowfilter).
The error is "Cannot find Column(A1).
A1 is the value for the first DOD. I need to filter on DOD not Test. It seem like that should work. Any Ideas
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LVL 83

Assisted Solution

by:CodeCruiser
CodeCruiser earned 2000 total points
ID: 24764431
In the RowFilter, you specify the column caption not value. If its varchar type then try this


ResultsTable.DefaultView.RowFilter = "DOD='" & T.DOD & "'"

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Author Closing Comment

by:MadIce
ID: 31598100
I had to adjust code for nullable value but answer is just what I was looking for.
If T.Test.HasValue Then ResultsTable.DefaultView.Item(0).Item("Test") = T.test
Thanks alot. Was getting ready to go back to using Store Procedure
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