Question

我使用来自我的WPF应用程序的代码将图像插入到.mdb数据库中：

Pic

Long binary data列或单元格的数据类型是OLE对象...无论如何，在插入数据后，我打开了我的数据库，我看到添加了一条新记录，但是Dim cmd As New OleDbCommand("Select * from recents", con) Dim table As New DataTable Dim adap As New OleDbDataAdapter(cmd) adap.Fill(table) If table.Rows.Count <= 0 Then Else For Each row In table.Rows recentbtn.Image.ImageSource = BytesToImage(CType(row(1), Byte())) recentbtn.Names.Text = table.Rows(0)(0).ToString AddHandler recentbtn.MouseDown, AddressOf recentbtn_mousedow RecentsList.stp.Children.Add(recentbtn) Next End If loadingrecents.Visibility = Visibility.Hidden End Sub Private Shared Function BytesToImage(ByVal bytes As Byte()) As BitmapImage Dim bm = New BitmapImage() Using stream As MemoryStream = New MemoryStream(bytes) stream.Position = 0 stream.Seek(0, SeekOrigin.Begin) bm.BeginInit() bm.StreamSource = stream bm.CreateOptions = BitmapCreateOptions.PreservePixelFormat bm.CacheOption = BitmapCacheOption.OnLoad bm.EndInit() End Using Return bm End Function的值列是{{1}}。无论如何，我继续在我的wpf应用程序中检索图像。我使用了这段代码？

{{1}}

但是它返回了一个错误：找不到适合完成操作的成像组件

Answer 1

修正了......对于将来遇到此错误的任何人：

确保以正确的方式插入数据（有时数据库中的数据损坏会导致此类错误）

2。您不需要做一些繁重的编码就可以将图像转换为字节！

最后，让我们的代码：

   Public Sub read()
    con.Open()
    Dim cmd As New OleDbCommand("Select * from recents", con)
    Dim _dr As OleDbDataReader
    _dr = cmd.ExecuteReader
    Dim _photo As Byte()
    While _dr.Read()
            Try
            _photo = CType(_dr(1), Byte())
            Dim strm As MemoryStream = New MemoryStream(_photo)
                Dim img As System.Drawing.Image = System.Drawing.Image.FromStream(strm)
                Dim bi As BitmapImage = New BitmapImage()
                bi.BeginInit()
                Dim ms As MemoryStream = New MemoryStream()
                img.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp)
                ms.Seek(0, SeekOrigin.Begin)
                bi.StreamSource = ms
                bi.EndInit()
            image1.Source = bi
        Catch ex As Exception
                MessageBox.Show(ex.Message)
            End Try
    End While

WPF vb.net没有找到适合完成操作的成像组件

1 个答案: