by Bruno Laurinec (1 Submission)
Category: Miscellaneous
Compatability: VB.NET
Difficulty: Unknown Difficulty
Originally Published: Tue 20th October 2009
Date Added: Mon 8th February 2021
Rating: 
(1 Votes)
Tab-delimited file parser This function reads tab-delimited file into datatable using VisualBasic.FileIO.TextFieldParser class
VBcoders
' Declare VisualBasic TextFieldParser object
Dim Parser As Microsoft.VisualBasic.FileIO.TextFieldParser
' Give the TextFieldParser object path to the file
Parser = My.Computer.FileSystem.OpenTextFieldParser(filePath)
' Set the field type to delimited
Parser.TextFieldType = Microsoft.VisualBasic.FileIO.FieldType.Delimited
' Set the character, that should the textfile be delimited with. As we are going to parse
' tab-delimited file, the delimiter will be Tab
Parser.SetDelimiters(vbTab)
' Declaring the datatable we will put the data into
Dim dtFinal As New DataTable
' Declaration of new DataRow
Dim dtNewRow As DataRow
' Setting-up boolean to know if we are on the first row to know whether add row, or add columns into the table
Dim FirstRow As Boolean = False
Dim CurrentRow() As String
Try
Do While Not Parser.EndOfData = True
Try
' Read one parsed line from the file
CurrentRow = Parser.ReadFields()
' If we are on the first row, we're gonna be adding columns into the dtFinal datatable
If FirstRow = False Then
For i As Integer = 0 To UBound(CurrentRow)
dtFinal.Columns.Add(CurrentRow(i).ToString, System.Type.GetType("System.String"))
Next
' Change value of the boolean so we know, that columns are already added and Continuation of the loop
FirstRow = True
Continue Do
Else
' Adding new row into the DataTable
dtNewRow = dtFinal.NewRow
For i As Integer = 0 To UBound(CurrentRow)
dtNewRow.Item(i) = CurrentRow(i).ToString
Next
dtFinal.Rows.Add(dtNewRow)
dtNewRow = Nothing
End If
' To prevent application looking "Not responsing"
System.Windows.Forms.Application.DoEvents()
' In case of error, messagebox will be popped-up....this is optional and can be changed to writing message into
' logfile or something similar..
Catch ex As Exception
MessageBox.Show("ERROR Occured during file processing. The error message is """ & ex.Message & """", Me.Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
End Try
Loop
' In case of error, messagebox will be popped-up....this is optional and can be changed to writing message into
' logfile or something similar..
Catch ex As Exception
MessageBox.Show("ERROR Occured during file processing. The error message is """ & ex.Message & """", Me.Text, MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
Finally
' Release the file and disposing of the TextFileParser object
Parser.Close()
Parser.Dispose()
End Try
' Return the newly constructed datatable
Return dtFinal
End Function
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
DataGridView1.DataSource = ParseTabDelimited("C:\polart.txt")
End Sub
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