[RESOLVED] [2005] displaying list(of type) in datagridview

[.paul.]

i'm trying to display a list(of type) in a datagridview.
the datagridview has 2 columns, the 1st is a text column + the 2nd is a checkbox column. the datagridview resizes to the correct size but it doesn't display anything. what am i doing wrong?

Public Class Form1
 
    Public Structure record
        Dim lastDatetime As String
        Dim checks As Boolean
    End Structure
    Private records As New List(Of record)
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        For x As Integer = -100 To -10 Step 10
            Dim rec As New record
            Dim dt As Date = Now.AddDays(x)
            rec.lastDatetime = dt.ToString
            rec.checks = True
            records.Add(rec)
        Next
        Dim rec1 As New record
        rec1.lastDatetime = Now.ToString
        rec1.checks = False
        records.Add(rec1)
 
        dgv1.DataSource = records
        dgv1.Update()
 
    End Sub
 
End Class

[stimbo]

Can you definitely use Structures to populate a dataGridView?

I have absolutely no idea as to the answer, just thought i'd ask. I just wonder if you are trying to bind a custom object - is the data in your strucure properly exposed if that makes sense?

Have you done this before and it has worked? If so then i'll stop talking.

[.paul.]

no i haven't done it before, and i didn't know if it was possible.
i've tried a slightly different approach now, but it still doesn't work.

Public Class Form1
 
    Public Structure record
        Dim lastDatetime As String
        Dim checks As Boolean
    End Structure
    Private records As New List(Of record)
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
 
        For x As Integer = -100 To -10 Step 10
            Dim rec As New record
            Dim dt As Date = Now.AddDays(x)
            rec.lastDatetime = dt.ToString
            rec.checks = True
            records.Add(rec)
        Next
        Dim rec1 As New record
        rec1.lastDatetime = Now.ToString
        rec1.checks = False
        records.Add(rec1)
 
        Dim serializer As New Xml.Serialization.XmlSerializer(GetType(List(Of record)))
        Dim fs As New IO.FileStream("test.xml", IO.FileMode.Create)
        serializer.Serialize(fs, records)
        fs.Close()
 
        Dim ds As New DataSet
        ds.ReadXml("test.xml")
        ds.Tables(0).Columns(0).ColumnName = "last access time"
        ds.Tables(0).Columns(1).ColumnName = "checks?"
 
        dgv1.AutoGenerateColumns = False
        dgv1.DataSource = ds.Tables(0)
        dgv1.Update()
 
    End Sub
 
End Class

it resizes the datagridview to the right number of rows, but it still doesn't display anything

[Atheist]

i think you'll have to use a BindingList(Of T) instead of a List(Of T). I think thats the name of it...

[.paul.]

i've got it working with the dataset now. i did try a BindingList earlier.
i forgot to set the column properties properly.
thanks