.net - 如何使用值转换器将字节数组绑定(bind)到 WPF 中的图像？

Question

我正在尝试将数据库中的字节数组绑定(bind)到 WPF 图像。

我的 XAML:

<Window.Resources>
    <local:BinaryImageConverter x:Key="imgConverter" />
</Window.Resources>
...
<Image Source="{Binding Path=ImageData, Converter={StaticResource imgConverter}}" />

我修改了 Ryan Cromwell 发布的代码对于值转换器:

Class BinaryImageConverter
    Implements IValueConverter
    Private Function Convert(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.Convert
        If value IsNot Nothing AndAlso TypeOf value Is Byte() Then
            Dim bytes As Byte() = TryCast(value, Byte())
            Dim stream As New MemoryStream(bytes)
            Dim image As New BitmapImage()
            image.BeginInit()
            image.StreamSource = stream
            image.EndInit()
            Return image
        End If
        Return Nothing
    End Function
    Private Function ConvertBack(ByVal value As Object, ByVal targetType As Type, ByVal parameter As Object, ByVal culture As System.Globalization.CultureInfo) As Object Implements IValueConverter.ConvertBack
        Throw New Exception("The method or operation is not implemented.")
    End Function
End Class

BinaryImageConverter 的 Convert() 函数的 image.EndInit() 行抛出此 NotSupportedException:

"No imaging component suitable to complete this operation was found."

InnerException: "Exception from HRESULT: 0x88982F50"

我不明白我做错了什么。我怎样才能让它工作？

<小时/>

更新

问题似乎是来自数据库的字节。一定是我放入它们的方式有问题。

请参阅下面我的工作代码。

Answer 1

您可以将字节[]绑定(bind)到图像。

这里是一个示例:

Xaml:

<Image Source="{Binding UserImage}"/>

代码:

private byte[] userImage;

public byte[] UserImage
   {
       get { return userImage; }
       set
       {
           if (value != userImage)
           {
               userImage = value;
               OnPropertyChanged("UserImage");
           }
       }
   }