[RESOLVED] Datagridview values create folder names

Hello can someone help me out how to create from datagridview values in rows in column 0 are the names that i want to create folder

Example:
Datagridview1 has 2 columns :

NameFolder NameNumber

so i insert a few records like

Folder1 FolderID
Folder2 FolderID2
Folder3 FolderID3

how i can make when press button to get informations from column 0 (NameFolder) and create folder in specific place like example C:\Test\ and inside will create folder with the names (Folder1,Folder2,Folder3) if not exists if exist will return back or overwrite
any ideas how can be done?

You're asking multiple unrelated questions here. Stick to one thing at a time. Getting data from a DataGridView is the same no matter what you want to do with it, so creating folders is irrelevant to that. Creating folders is the same no matter where the paths come from, so DataGridViews are irrelevant to that. ALWAYS break your task down into the smallest parts possible and address each part individually.

Are you able to read data from a DataGridView? What have you tried and where are you stuck in doing that specifically?

okay, how to make to read from datagridview column0 the rows information and create folders with that names in specific location

Code:

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For Each row As DataRow In YourDataGridView.Rows
  Dim FolderNames = row("NameLine")
Next 

Dim AllFolders = (From row As DataGridViewRow
              In YourDataGridView.Rows
              Select row.Cells("NameLine").Value).ToList()

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or maybe would be better to put them in list then from list to create the folders?

Code:

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Dim cellValues As New List(Of String)
   
For Each row As DataGridViewRow In DataGridView1.Rows
    cellValues.Add(row.Cells(0).Value.ToString())
Next

 Dim PathFind = "C:\Test\"
 For Each row As String In cellValues
        If Not System.IO.Directory.Exists(PathFind+row) Then
        System.IO.Directory.CreateDirectory(PathFind+row)
      End If
    Next

---

I found some code similar but its not okay

What's wrong with using a loop? Don't try to copy LINq code that you don't understand. Presumably you know the baqsics of writing a loop. Put some thought into the logic instead of expecting to find turnkey solutions to copy and paste.

edit my previous post, maybe with list would be better?

So are you able to populate the list with the data you want or not?

i was just thinking what would be the best method to get the information from the datagridview1 column 0 rows and use the rows information to create the folders with that information text.
So i was wondering is it better to fetch all rows in column0 in list and then from the list to create folders with the stored information. Thats why i ask for assistance about this how can i start or build it correctly

maybe would be like this:

Code:

---

Dim cellValues As New List(Of String)
   
For Each row As DataGridViewRow In DataGridView1.Rows
    cellValues.Add(row.Cells(0).Value.ToString())
Next

 Dim PathFind = "C:\Test\"
 For Each row As String In cellValues
        If Not System.IO.Directory.Exists(PathFind+row) Then
        System.IO.Directory.CreateDirectory(PathFind+row)
      End If
    Next

---

Put some thought into it. This is your application, not ours. If you are going to use a loop to get the data from the grid into a list and then use another loop to get the data from the list to create the folders and then never use the list again, what would be the point of that? Two loops and a list compared to one loop and no list. What exactly are you confused about? If you want to be able to use the list for something else later then that's a different matter but you have made no indicationb that that is the case.

Quote:

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Originally Posted by jmcilhinney

Put some thought into it. This is your application, not ours. If you are going to use a loop to get the data from the grid into a list and then use another loop to get the data from the list to create the folders and then never use the list again, what would be the point of that? Two loops and a list compared to one loop and no list. What exactly are you confused about? If you want to be able to use the list for something else later then that's a different matter but you have made no indicationb that that is the case.

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Yes i plan to use it more than 1 time, example later i would like to fetch what was created (so possible i need to store them in a file this way right? )

okay here is what i created until now to store the information inside .txt file

Code:

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Using writer As New StreamWriter(My.Application.Info.DirectoryPath & "\Test\Info.txt")
            For i As Integer = 0 To DataGridView1.Rows.Count - 2 Step +1
                For j As Integer = 0 To DataGridView1.Columns.Count - 1 Step +1
                    If j = DataGridView1.Columns.Count - 1 Then
                        writer.Write(DataGridView1.Rows(i).Cells(j).Value.ToString())
                    Else
                        writer.Write(DataGridView1.Rows(i).Cells(j).Value.ToString() & "|")
                    End If
                Next j
                writer.WriteLine("")
            Next i
            MessageBox.Show("Data Exported")
        End Using

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So this way i make Export / Import options.
Now how can i make from the datagridview to create the folder names depending the column0 values string names ?

i created this method for create the folders:

Code:

---

For Each r As DataGridViewRow In DataGridView1.Rows
            If Not Directory.Exists(My.Application.Info.DirectoryPath & "\Test\" + r.Cells(0).Value.ToString) Then
                Directory.CreateDirectory(My.Application.Info.DirectoryPath & "\Test\" + r.Cells(0).Value.ToString)
            End If
        Next

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here is the error that i receive, but folders are created:

Code:

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System.NullReferenceException: 'Object reference not set to an instance of an object.'
System.Windows.Forms.DataGridViewCell.Value.get returned Nothing.

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Edit: figured it out i just added (0).Value?.ToString fixed the error