Help wityh using multyiple values in code using VB.NET

vcharles
vcharles used Ask the Experts™
on
Hi,

I'm using the code below to delete records in other xml files based on record deleted from a datagrid, how I modify the code to apply to multiple countries, for example if I include countries in s = ('BEL', 'FRA', NLD, USA) , How do I loop through the variable and replace country in the code if the file exist (i.e.LinkItemUSA.xml) ?

   For i = Me.C1TrueDBGrid4.SelectedRows.Count - 1 To 0 Step -1
                    Dim DVa As New DataView(dtb, "Child_Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & " or Parent_Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & "", Nothing, DataViewRowState.CurrentRows)
                    For X = DVa.Count - 1 To 0 Step -1
                        DVa.Item(X).Delete()
                    Next
                    Dim DV1 As New DataView(dtb, "", Nothing, DataViewRowState.CurrentRows)
                    Dim FilteredDT As DataTable
                    FilteredDT = DV1.ToTable
                    FilteredDT.TableName = "Row"
                    FilteredDT.WriteXml(Application.StartupPath + "\Data\LinkFiles\LinkItemUSA.xml")

                    Dim DVa1 As New DataView(dtc, "Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & "", Nothing, DataViewRowState.CurrentRows)
                    For X = DVa1.Count - 1 To 0 Step -1
                        DVa1.Item(X).Delete()
                    Next
                    Dim DV11 As New DataView(dtc, "", Nothing, DataViewRowState.CurrentRows)
                    Dim FilteredDT1 As DataTable
                    FilteredDT1 = DV11.ToTable
                    FilteredDT1.TableName = "Row"
                    FilteredDT1.WriteXml(Application.StartupPath + "\Data\LinkFiles\LinkPPFUSA.xml")

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How do you know which country you want to write to? Is it coming from one of the columns of C1TrueDBGrid4? You'd probably want to change the filename in your .WriteXML statements to something like:
             FilteredDT.WriteXml(Application.StartupPath + "\Data\LinkFiles\LinkItem" _
                 & C1TrueDBGrid4.Columns(0).Value & ".xml")

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Author

Commented:
Hi,

I'm sorry for the late reply.

I need to delete data for all countries listed in s = ('BEL', 'FRA', NLD, USA).


Victor
Is "s" defined somewhere outside this block of code? Is that intended to be a string, or a set? That is, is this stored like:

Dim s as String = ('BEL', 'FRA', NLD, USA)

or

Dim s(3) as String = {"BEL", "FRA", "NLD", "USA"}

so that S(0) = "BEL", S(1) = "FRA", etc.

Why do some of the country codes have single quotes around them, while others don't?

Do you have files like LinkItemUSA.xml, LinkItemBEL.xml, etc.?
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Author

Commented:
Hi,

My mistake,  all the countries have single quotes between them.

Victor
I still don't understand exactly how they're coming. You're giving me one-sentence comments which don't fully describe what's happening. What exactly does "s = ('BEL', 'FRA', NLD, USA)" mean? Is that a string? Is it an array of strings? Is it a field in a table?

Author

Commented:
The countries are  in a string, would like to apply the code for each  country instead of writing the same for each country.
It'll probably be easiest to break the string into an array, then loop through the array of country codes:
        Dim s As String = "'BEL', 'FRA', NLD, USA"
        Dim charSeparators() As Char = {","c}
        Dim CountrySet As String() = s.Split(charSeparators)
        For j As Integer = 0 To CountrySet.GetUpperBound(0)
            ' Remove quotes if around code
            If Mid(CountrySet(j), 1, 1) = "'" Then
                CountrySet(j) = Mid(CountrySet(j), 2, Len(CountrySet(j)) - 2)
            End If
            For i = Me.C1TrueDBGrid4.SelectedRows.Count - 1 To 0 Step -1
                Dim DVa As New DataView(dtb, "Child_Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & " or Parent_Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & "", Nothing, DataViewRowState.CurrentRows)
                For X = DVa.Count - 1 To 0 Step -1
                    DVa.Item(X).Delete()
                Next
                Dim DV1 As New DataView(dtb, "", Nothing, DataViewRowState.CurrentRows)
                Dim FilteredDT As DataTable
                FilteredDT = DV1.ToTable
                FilteredDT.TableName = "Row"
                FilteredDT.WriteXml(Application.StartupPath + "\Data\LinkFiles\LinkItem" & CountrySet(j) & ".xml")

                Dim DVa1 As New DataView(dtc, "Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & "", Nothing, DataViewRowState.CurrentRows)
                For X = DVa1.Count - 1 To 0 Step -1
                    DVa1.Item(X).Delete()
                Next
                Dim DV11 As New DataView(dtc, "", Nothing, DataViewRowState.CurrentRows)
                Dim FilteredDT1 As DataTable
                FilteredDT1 = DV11.ToTable
                FilteredDT1.TableName = "Row"
                FilteredDT1.WriteXml(Application.StartupPath + "\Data\LinkFiles\LinkPPF" & CountrySet(j) & ".xml")
            Next i
        Next j

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This goes through the same set of selected rows from the C1TrueDBGrid4 table for each country. You may need to change the selection of rows for each country, or something that. The place to change the row selection would be right before the Next j at the end of the routine.

Author

Commented:
Hi,

How do you check if the file for a country exist before executing the code below?

Thanks,

Victor
If File.Exists(myfile) ...

Author

Commented:
Hi,

Do you mean the approach below? Don't currently have access to my project.

Dim myfile as string = Application.StartupPath + "\Data\LinkFiles\LinkPPF" & CountrySet(j) & ".xml")
  Dim s As String = "'BEL', 'FRA', NLD, USA"
        Dim charSeparators() As Char = {","c}
        Dim CountrySet As String() = s.Split(charSeparators)
        For j As Integer = 0 To CountrySet.GetUpperBound(0)
If File.Exists(myfile) then
            ' Remove quotes if around code
            If Mid(CountrySet(j), 1, 1) = "'" Then
                CountrySet(j) = Mid(CountrySet(j), 2, Len(CountrySet(j)) - 2)
            End If
            For i = Me.C1TrueDBGrid4.SelectedRows.Count - 1 To 0 Step -1
                Dim DVa As New DataView(dtb, "Child_Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & " or Parent_Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & "", Nothing, DataViewRowState.CurrentRows)
                For X = DVa.Count - 1 To 0 Step -1
                    DVa.Item(X).Delete()
                Next
                Dim DV1 As New DataView(dtb, "", Nothing, DataViewRowState.CurrentRows)
                Dim FilteredDT As DataTable
                FilteredDT = DV1.ToTable
                FilteredDT.TableName = "Row"
                FilteredDT.WriteXml(Application.StartupPath + "\Data\LinkFiles\LinkItem" & CountrySet(j) & ".xml")

                Dim DVa1 As New DataView(dtc, "Item_ID like " & "'" & C1TrueDBGrid4.Columns(0).Value & "'" & "", Nothing, DataViewRowState.CurrentRows)
                For X = DVa1.Count - 1 To 0 Step -1
                    DVa1.Item(X).Delete()
                Next
                Dim DV11 As New DataView(dtc, "", Nothing, DataViewRowState.CurrentRows)
                Dim FilteredDT1 As DataTable
                FilteredDT1 = DV11.ToTable
                FilteredDT1.TableName = "Row"
                FilteredDT1.WriteXml(Application.StartupPath + "\Data\LinkFiles\LinkPPF" & CountrySet(j) & ".xml")
End If

Thanks,

Victor
Setting myfile to the file name needs to happen inside the For J loop (you could put it right before If File.Exists). Otherwise, yes, that's what I had in mind. You can use myfile again when you're actually writing the XML file as well. Do you need to check for the existence of both files, LinkItemxxx.xml and LinkPPFxxx,xml?

Author

Commented:
Thank You.

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