VB.net DataGridView 不显示来自 MySql 数据库的数据

Question

I am trying to display the data from MySql database using DataGridView DataSource and MySqlDataAdapter filling a DataTable . Then the data goes into the DataGridView . I do not know what is the problem, everything seems right and my code is correct, but nothing is being displayed on my DataGridView .

 Try
            Me.DataGridViewp.DataSource = Nothing

            ConnDB()
            sqL = "SELECT picture FROM product"
            cmd = New MySqlCommand(sqL, conn)
            Dim dtSample As New DataTable
            Dim daSample As New MySqlDataAdapter(cmd)
            daSample.Fill(dtSample)

            Me.DataGridViewp.DataSource = dtSample

            conn.Close()
            conn.Dispose()

        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
End Sub

Answer 1

If I understood you correctly, you are trying to show an image in a DatGridView. You should see your images if they are available in the database as byte array. otherwise, it will not be shown in the DatGridView.

I use the following function to convert images to byte array before saving it to the database. Following is a sample code to convert it to byte array before saving. (I am attaching the code as an image since it does not show correctly formatted when I paste it here). You have to add a reference (System.IO) for this code to work in your relevant form.

This works for me and hope this helps you.

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