Dgv csv

[MacShand]

Hi all

I have code to save my DGV in a .txt file:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Using writer As New StreamWriter("filepath.txt")
            For Each row As DataGridViewRow In Me.DataGridView1.Rows
                writer.WriteLine(String.Format("{0},{1},{2},{3},{4}", _
                                               row.Cells(0).Value, _
                                               row.Cells(1).Value, _
                                               row.Cells(2).Value, _
                                               row.Cells(3).Value, _
                                               row.Cells(4).Value))
            Next
        End Using

    End Sub

How can i reload a Comma Separated Value back into my DGV?

Many thanks.

Ps. once I've solved this issue, my programme will be complete!

[ForumAccount]

There are a few ways, you can actually use ADO.NET to do this. Your best bet is probably to get the text file into a DataTable object so that you can just bind it to the DataGridView. You could look at the TextFieldParser class to read the fields. While reading the fields, you can add them to a DataTable.

[MacShand]

Hi there! Thanks for the reply.

Would it be possible for you to help me with the code for this? I'm not very experienced and so am not great at manipulating vb code. S:

[ForumAccount]

This is your project so you should at least try. Start by taking a look at the example in the link that I posted. Get your application to read your file, after you can read your file successfully, start looking at how you could put that in a DataTable.

[MacShand]

:S I'm sorry to come back with little result..I simply cannot master this at all. I'd really appreciate your help on this one

[kareninstructor]

:S I'm sorry to come back with little result..I simply cannot master this at all. I'd really appreciate your help on this one

Hello, please show us what you have tried and what was the result.

[MacShand]

Hi Kevin!

I tried the following, from the link posted above...

Using MyReader As New Microsoft.VisualBasic.FileIO.
    TextFieldParser("c:\temp\test2")

    MyReader.TextFieldType = 
        Microsoft.VisualBasic.FileIO.FieldType.Delimited
    MyReader.Delimiters = New String() {vbTab}
    Dim currentRow As String()
    'Loop through all of the fields in the file. 
    'If any lines are corrupt, report an error and continue parsing. 
    While Not MyReader.EndOfData
        Try
            currentRow = MyReader.ReadFields()
            ' Include code here to handle the row.
        Catch ex As Microsoft.VisualBasic.FileIO.MalformedLineException
            MsgBox("Line " & ex.Message & 
            " is invalid.  Skipping")
        End Try
    End While
End Using

However, I'm not sure how to manipulate this into reading my file let alone separating the CSV file into the appropriate fields on my DGV.

Sorry for the inconvenience...i really do appreciate help!

[kareninstructor]

Hi Kevin!

I tried the following, from the link posted above...

Using MyReader As New Microsoft.VisualBasic.FileIO.
    TextFieldParser("c:\temp\test2")

    MyReader.TextFieldType = 
        Microsoft.VisualBasic.FileIO.FieldType.Delimited
    MyReader.Delimiters = New String() {vbTab}
    Dim currentRow As String()
    'Loop through all of the fields in the file. 
    'If any lines are corrupt, report an error and continue parsing. 
    While Not MyReader.EndOfData
        Try
            currentRow = MyReader.ReadFields()
            ' Include code here to handle the row.
        Catch ex As Microsoft.VisualBasic.FileIO.MalformedLineException
            MsgBox("Line " & ex.Message & 
            " is invalid.  Skipping")
        End Try
    End While
End Using

However, I'm not sure how to manipulate this into reading my file let alone separating the CSV file into the appropriate fields on my DGV.

Sorry for the inconvenience...i really do appreciate help!

Please take the time and download a sample project ready to go where a file is read in using TextFieldParser where the text file is delimited by tab. There is much more than you need in the sample project, study it and steal from the code as needed.

http://kevininstructor.home.comcast....ieldParser.zip

[MacShand]

Hi Kevin

Thanks for being so willing to share the project and code.

I can only apologise...but I've spent the evening trying to pick the bits of code that are needed to make my application work and I cannot work out which parts I need.

I feel this is something that should be relatively straightforward but I just cannot crack it. The only light at the end of the tunnel is that when I do get it, I'll be finished my programme!

Would you be willing to advise on the code that I specifically need?

Many thanks for all your time and help.

[kareninstructor]

Hi Kevin

Thanks for being so willing to share the project and code.

I can only apologise...but I've spent the evening trying to pick the bits of code that are needed to make my application work and I cannot work out which parts I need.

I feel this is something that should be relatively straightforward but I just cannot crack it. The only light at the end of the tunnel is that when I do get it, I'll be finished my programme!

Would you be willing to advise on the code that I specifically need?

Many thanks for all your time and help.

Let me drum up another idea for you using TextFieldParser, hang loose.

[kareninstructor]

The following for this demo is a file named Products.txt stored in the same folder as your project executable. If you want it some place else than adjust the code.

The demo is hard coded to work with a three column per line text file. If you have a different amount of columns then you need to adjust the red code below. For each item shown in red there must be a column in the DataGridView for the column. So your DataGridView in this case requires three columns. If there are less columns then a message box appears indicating this. If you have more columns then you need to adjust the code in green. If the file is not present then a message box indicates this. Any other errors are also reported back to you. In a real app you would handle the errors differently of course as the user does not need to see these messages.

Hope this helps.

1,Chai,boxes x 20 bags,$18.00
2,Chang,24 - 12 oz bottles,$19.00
3,Aniseed Syrup,12 - 550 ml bottles,$10.00
4,Chef Anton's Cajun Seasoning,48 - 6 oz jars,$22.00
5,Chef Anton's Gumbo Mix36 boxes,$21.35
6,Grandma's Boysenberry Spread,12 - 8 oz jars,$25.00
7,Uncle Bob's Organic Dried Pears,12 - 1 lb pkgs.,$30.00
8,Northwoods Cranberry Sauce,12 - 12 oz jars,$40.00
9,Mishi Kobe Niku,18 - 500 g pkgs.,$97.00
10,Ikura,12 - 200 ml jars,$31.00

Form code

Public Class Form1
   Private ErrorList As New List(Of String)
   Private Sub Form1_Load( _
      ByVal sender As System.Object, _
      ByVal e As System.EventArgs) Handles MyBase.Load

      DataGridView1.AllowUserToAddRows = False

      If Not DataGridView1.LoadTextFile("Products.txt", ErrorList) Then
         Dim sb As New System.Text.StringBuilder
         sb.AppendLine("Failed to load text file, see error messages below.")
         For Each item In ErrorList
            sb.AppendLine(item)
         Next
         MessageBox.Show(sb.ToString)
      End If
   End Sub
End Class

Create Module1.vb in your project with the following code.

Imports Microsoft.VisualBasic.FileIO
Module Module1
   <System.Diagnostics.DebuggerStepThrough()> _
   <System.Runtime.CompilerServices.Extension()> _
   Public Function LoadTextFile( _
      ByVal sender As DataGridView, _
      ByVal FileName As String, _
      ByRef Errors As List(Of String)) As Boolean

      If Not IO.File.Exists(FileName) Then
         Errors.Add("Failed to locate '" & FileName & "'")
         Return False
      End If

      If sender.ColumnCount <> 3 Then

         Errors.Add("Must have three columns to load your text file., there are " & _
                    sender.ColumnCount.ToString & " columns presently.")

         Return False

      End If

      Using MyReader As New TextFieldParser(FileName)
         MyReader.TextFieldType = FileIO.FieldType.Delimited
         MyReader.Delimiters = New String() {","}
         Dim Line As String()

         sender.SuspendLayout()

         Try
            While Not MyReader.EndOfData
               Try
                  Line = MyReader.ReadFields()
                  '
                  ' For every column per line
                  ' there must be a column in the DataGridView
                  '
                  sender.Rows.Add(New Object() {Line(0), Line(1), Line(2)})
               Catch ex As FileIO.MalformedLineException
                  '
                  ' Report problem
                  '
                  Errors.Add(ex.Message)
               Catch ex As Exception
                  Errors.Add(ex.Message)
               End Try
            End While
         Finally
            sender.ResumeLayout()
         End Try
      End Using

      Return Errors.Count = 0

   End Function
End Module

[MacShand]

Kevin, thank you for this. It's absolutely spot on and well outwith my knowledge! it's great to have such helpful experts available! Thank you.

[kareninstructor]

Kevin, thank you for this. It's absolutely spot on and well outwith my knowledge! it's great to have such helpful experts available! Thank you.

Good to hear this works for you.

[.paul.]

as you're using vb2010:

1,Chai,boxes x 20 bags,$18.00
2,Chang,24 - 12 oz bottles,$19.00
3,Aniseed Syrup,12 - 550 ml bottles,$10.00
4,Chef Anton's Cajun Seasoning,48 - 6 oz jars,$22.00
5,Chef Anton's Gumbo Mix,36 boxes,$21.35
6,Grandma's Boysenberry Spread,12 - 8 oz jars,$25.00
7,Uncle Bob's Organic Dried Pears,12 - 1 lb pkgs.,$30.00
8,Northwoods Cranberry Sauce,12 - 12 oz jars,$40.00
9,Mishi Kobe Niku,18 - 500 g pkgs.,$97.00
10,Ikura,12 - 200 ml jars,$31.00

Public Class Form1
 
    Private Sub Form1_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        Dim lines() As String = IO.File.ReadAllLines("csv.txt")
        Dim dt As New DataTable
        dt.Columns.AddRange(New DataColumn() {New DataColumn("id"), New DataColumn("name"), New DataColumn("quantity"), New DataColumn("price")})
        Array.ForEach(lines, Sub(line) dt.Rows.Add(line.Split(","c)))
        datagridview1.datasource = dt
    End Sub
 
End Class