Replacing value in .csv file

[Train_Wreck]

Hey, i have a question: Is it possible to replace a value in a .csv file using VB????

Here is an example of what im talking about:

Column1, Column2, Column3, Column4, Column5
Value1, Value2, Value3, ., Vlaue5

i need to replace ,., with , Value4,

[kareninstructor]

You would read the file in say with TextFieldParser class line by line, place the data into a string array then write the data back to the file after finishing looping thru the file.

The replacement happens as you are reading a line that meets critiera to change text. Use IO.File.WriteAllLines to write the array back to disk.

[.paul.]

dim lines() as string = io.file.readalllines("csv.txt")
for x as integer = 0 to lines.getupperbound(0)
    if lines(x).contains(".,") then
        lines(x) = lines(x).replace(".", "Value4")
    end if
next
 
io.file.writealllines("csv.txt", lines)

[Train_Wreck]

thanks for the reply i will check out the links and post something if/when i figure out how to write the code.

[ThomasJohnsen]

dim lines() as string = io.file.readalllines("csv.txt")
for x as integer = 0 to lines.getupperbound(0)
    if lines(x).contains(".,") then
        lines(x) = lines(x).replace(".", "Value4")
    end if
next
 
io.file.writealllines("csv.txt", lines)

This bit of code may not work as intended. Assuming any of value1, value2, value3 or value5 contain a ".", you would end up replacing more "."s than the one we're interested in replacing. Using indexof would most likely be a better option, depending on the input data ofc.

#EDIT: The following should work regardless of contents of the other fields (at least on the small sample of data I tried it on):

        Dim lines() As String = IO.File.ReadAllLines("csv.txt")
        Dim i As Integer

        For x As Integer = 0 To lines.GetUpperBound(0)
            i = lines(x).IndexOf(".,")
            If i > 0 Then
                lines(x) = lines(x).Substring(0, i) & "value4" & lines(x).Substring(i + 1, lines(x).Length - i - 1)
            End If
        Next

        IO.File.WriteAllLines("csv.txt", lines)

[Train_Wreck]

dim lines() as string = io.file.readalllines("csv.txt")
for x as integer = 0 to lines.getupperbound(0)
    if lines(x).contains(".,") then
        lines(x) = lines(x).replace(".", "Value4")
    end if
next
 
io.file.writealllines("csv.txt", lines)

hey this worked perfectly!!!!!!! Thankz