WPF VB.NET图像不会出现在内存流中 [英] WPF VB.NET Image not appear from memorystream

问题描述

大家好，



我有一张图片要在我的页面中查看。但我想知道为什么这个图像不是视图。我的其他程序使用相同的代码，图像可以查看。但就这一点来说，它并没有出现。如果我手动选择源，它有图像视图。通过代码，它不是。请看一下我的代码。

Hi all,

I have an image to be view in my page. But I wonder why this image is not view. My others program use the same code and image can be view. But on this one, it's not appear. If I manually select the source, it has image view. By code, its not. Please take a look at my code.

If Not IsNothing(.event_logo) Then
    cv_logo.Visibility = Windows.Visibility.Visible
    Dim mstream As System.IO.MemoryStream
    Dim photo2 As New BitmapImage()
    img_eventlogo = New Image
    'If logo bytes is not null, fill into image to be view
    mstream = New System.IO.MemoryStream(udt_meeting.event_logo)
    photo2.BeginInit()
    photo2.StreamSource = mstream
    photo2.CacheOption = BitmapCacheOption.OnLoad
    photo2.EndInit()
    img_eventlogo.Source = photo2
    img_eventlogo.Stretch = Stretch.Fill
    mstream = Nothing
End If

***我搜索了用于将字节流式传输到图像的其他代码的Internet。但它不起作用..



请help.TQ

*** I have search for the internet for other code to stream byte to image. But it's not working..

Please assist.TQ

推荐答案

我找到了解决方案，< br $>

I have found the solutions,

Using stream = New MemoryStream(.event_logo)
    Dim bitmap = New BitmapImage()
    bitmap.BeginInit()
    bitmap.StreamSource = stream
    bitmap.CacheOption = BitmapCacheOption.OnLoad
    bitmap.EndInit()
    bitmap.Freeze()
    img_righteventlogo.Source = bitmap
End Using

我不知道我的邮政编码和答案代码有什么不同。但答案有效

I don't know what is the different between my post code and my answer code. But the answer works

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