vb.net - 填充DataGridView

Question

我的问题是从我的访问数据库中获取数据以显示在视图中。每当我运行应用程序时，它会在 da2.Fill(ds2, "Inventory") 之前出错。我使用的表称为产品和库存。已经尝试了我能想到的一切，任何提示/来源为什么会非常受欢迎。

Public Class Form1
Dim con As New OleDb.OleDbConnection
Dim ds As New DataSet ' in memory version of database
Dim da As OleDb.OleDbDataAdapter
Dim sql As String

Dim ds2 As New DataSet
Dim da2 As OleDb.OleDbDataAdapter
Dim sql2 As String

Dim strProdNo As String
Dim inc, MaxRows As Integer

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    'TODO: This line of code loads data into the 'ComputerWarehouseProjectDataSet.Product' table. You can move, or remove it, as needed.
    'Me.ProductTableAdapter.Fill(Me.ComputerWarehouseProjectDataSet.Product)
    con.ConnectionString = "PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source = ComputerWarehouseProject.mdb"
    con.Open() 'put a try catch around this
    sql = "SELECT * FROM Product order by ProdNo"
    da = New OleDb.OleDbDataAdapter(sql, con)
    da.Fill(ds, "ComputerWarehouseProject")
    con.Close()
    MaxRows = ds.Tables("ComputerWarehouseProject").Rows.Count
    inc = 0
    NavigateRecords()

End Sub
Private Sub NavigateRecords()
    Try
        txtId.Text = ds.Tables("ComputerWarehouseProject").Rows(inc).Item(0)
        txtPart.Text = ds.Tables("ComputerWarehouseProject").Rows(inc).Item(1)
        txtQoh.Text = ds.Tables("ComputerWarehouseProject").Rows(inc).Item(3)
        txtCost.Text = ds.Tables("ComputerWarehouseProject").Rows(inc).Item(4)
        'MessageBox.Show("Works 1")
        txtSugPrice.Text = ds.Tables("ComputerWarehouseProject").Rows(inc).Item(5)
        cbProd.Text = ds.Tables("ComputerWarehouseProject").Rows(inc).Item(0) & " " & ds.Tables("ComputerWarehouseProject").Rows(inc).Item(1)
        'MessageBox.Show("Works 2")
        txtRecBeg.Text = (inc + 1).ToString
        'MessageBox.Show("Works 3")
        txtRecEnd.Text = ds.Tables("ComputerWarehouseProject").Rows.Count.ToString
        'MessageBox.Show("Works 4")
        bldInv()
        'MessageBox.Show("Works 5")
    Catch
        MessageBox.Show("Data Error! Cannot Navigate to Selected Record at position " & inc.ToString)

    End Try

End Sub
Private Sub bldInv()

    strProdNo = ds.Tables("ComputerWarehouseProject").Rows(inc).Item(0)
    sql2 = "Select * from Inventory where ProdNo = " + strProdNo
    ds2.Clear()
    MessageBox.Show(sql2)
    da2 = New OleDb.OleDbDataAdapter(sql2, con)

    MessageBox.Show("Right before fill")
    da2.Fill(ds2, "Inventory")


    dgvInv.DataSource = ds2.Tables("Inventory")
    dgvInv.AutoResizeColumns()


End Sub

Answer 1

你也可以试试这个：

da.Fill(ds)
con.Close()
MaxRows = ds.Tables(0).Rows.Count