Asp.net 将BitmapImage转换为字节数组并存储到Sql数据库中
我想将位图图像存储到字节,但在运行时我遇到了如下错误 从类型图像格式转换为类型整型无效 请任何人帮助我Asp.net 将BitmapImage转换为字节数组并存储到Sql数据库中,asp.net,.net,vb.net,Asp.net,.net,Vb.net,我想将位图图像存储到字节,但在运行时我遇到了如下错误 从类型图像格式转换为类型整型无效 请任何人帮助我 For Each file As UploadedFile In` DOC.UploadedFiles` Context.Cache.Remove(Session.SessionID + "UploadedFile") Dim stream As Stream = file.InputStream
For Each file As UploadedFile In` DOC.UploadedFiles`
Context.Cache.Remove(Session.SessionID + "UploadedFile")
Dim stream As Stream = file.InputStream
GenerateThumbnails(0.5, stream)
Dim DocumentImgName = file.FileName
Dim imgData As Byte() = New Byte(ViewState("CompressedImageData")) {}
Dim DocumentSplit = DocumentImgName.Split(".")
Dim ImgName = DocumentSplit(0)
Dim ImgExt = DocumentSplit(1)
stream.Read(imgData, 0, imgData.Length)
ViewState("imgData") = imgData
ViewState("FileName") = ImgName
ViewState("FileExtension") = ImgExt
Dim ms As New MemoryStream()
ms.Write(imgData, 0, imgData.Length)
Next
Private Sub GenerateThumbnails(ByVal scaleFactor As Double, ByVal sourcePath As Stream)
Using image__1 = Image.FromStream(sourcePath)
' can given width of image as we want
Dim newWidth = CInt(image__1.Width * scaleFactor)
' can given height of image as we want
Dim newHeight = CInt(image__1.Height * scaleFactor)
Dim thumbnailImg = New Bitmap(newWidth, newHeight)
Dim thumbGraph = Graphics.FromImage(thumbnailImg)
thumbGraph.CompositingQuality = CompositingQuality.HighQuality
thumbGraph.SmoothingMode = SmoothingMode.HighQuality
thumbGraph.InterpolationMode = InterpolationMode.HighQualityBicubic
Dim imageRectangle = New Rectangle(0, 0, newWidth, newHeight)
thumbGraph.DrawImage(image__1, imageRectangle)
ViewState("CompressedImageData") = image__1.RawFormat
End Using
End Sub
您可以在将图像数据转换为字节数据类型后存储图像数据,如下所示:
然后可以将byteImage()存储到类型为Image或Varbinary的字段中。我的应用程序中没有使用任何图片框,那么该怎么办,非常感谢你的回答
Dim ms As New Syste.IO.MemoryStream
Me.PictureBox1.Image.Save(ms, PictureBox1.Image.RawFormat)
Dim byteImage() As Byte = ms.ToArray