Question

我正在尝试通过CellClick事件从DataGridView访问数据。在 VB .NET

中

当我点击单元格时，我从表格中获得所有数据但不能在 PictureBox 中查看图像。当我只尝试此代码时：

 pic1 = selectedRow.Cells(13).Value
    Dim ms As New MemoryStream(pic1)
    pb_stud_pic.Image = Image.FromStream(ms)

我有错误！无法转换类型为'system.object＆＃39;的对象输入＆＃39; system.byte []＆＃39;

然后我尝试下面的代码：但后来我没有在图片框中获取图像..

我尝试过：

 Private Sub DataGridView1_CellClick(sender As System.Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.CellClick
        Try

            Dim index As Integer = e.RowIndex
            Dim selectedRow As New DataGridViewRow()
            selectedRow = DataGridView1.Rows(index)

            txt_stud_no.Text = selectedRow.Cells(0).Value.ToString()
            txt_stud_name.Text = selectedRow.Cells(1).Value.ToString()
            dtp_stud_dob.Value = selectedRow.Cells(2).Value.ToString()
            txt_stud_gender.Text = selectedRow.Cells(3).Value.ToString()

            If txt_stud_gender.Text = "Male" Then
                rdo_male.Checked = True
            Else
                rdo_female.Checked = True
            End If

            cb_stud_blood.Text = selectedRow.Cells(4).Value.ToString()

            txt_stud_add.Text = selectedRow.Cells(5).Value.ToString()
            txt_stud_city.Text = selectedRow.Cells(6).Value.ToString()
            txt_stud_pc.Text = selectedRow.Cells(7).Value.ToString()
            txt_stud_mob.Text = selectedRow.Cells(8).Value.ToString()
            cb_adyear.Text = selectedRow.Cells(9).Value.ToString()
            cb_cbranch.Text = selectedRow.Cells(10).Value.ToString()
            txt_stud_email.Text = selectedRow.Cells(11).Value.ToString()
            cb_csem.Text = selectedRow.Cells(12).Value.ToString()

            con.Open()
            dr = cm.ExecuteReader()
            If dr.Read() Then
                If Not dr.IsDBNull(dr.GetOrdinal("Image")) Then
                    pic1 = CType(dr("Image"), Byte())
                    pic1 = selectedRow.Cells(13).Value
                    pic1 = ds.Tables("Student").Rows(i)(13)

                    If Not (pic1 Is Nothing) Then
                        Dim ms As New MemoryStream(pic1)
                        pb_stud_pic.Image = Image.FromStream(ms)
                    Else
                        pb_stud_pic.Image = Nothing
                    End If
                End If
            End If
            con.Close()

        Catch ex As Exception
            MessageBox.Show("Error!" & ex.Message)
            con.Close()
        End Try
    End Sub

Answer 1

您是否尝试过使用BinaryFormatter，请参阅MSDN： https://msdn.microsoft.com/en-us/library/system.runtime.serialization.formatters.binary.binaryformatter.aspx?cs-save-lang=1&cs-lang=vb#code-snippet-1

您必须将对象序列化为MemoryStream并在流上调用ToArray方法将其转换为字节数组，并希望能够将其分配给Image成员。对于缺少代码感到抱歉，我的VB语法技能落后数十年。

错误！无法转换类型为'system.object＆＃39;的对象输入＆＃39; system.byte []＆＃39;

1 个答案: