Meine WPF-Anwendung erhält eine Datei vom Benutzer mit Microsoft.Win32.OpenFileDialog()...
Private Sub ButtonUpload_Click(...)
Dim FileOpenStream As Stream = Nothing
Dim FileBox As New Microsoft.Win32.OpenFileDialog()
FileBox.InitialDirectory = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments)
FileBox.Filter = "Pictures (*.jpg;*.jpeg;*.gif;*.png)|*.jpg;*.jpeg;*.gif;*.png|" & _
"Documents (*.pdf;*.doc;*.docx;)|*.pdf;*.doc;*.docx;|" & _
"All Files (*.*)|*.*"
FileBox.FilterIndex = 1
FileBox.Multiselect = False
Dim FileSelected As Nullable(Of Boolean) = FileBox.ShowDialog(Me)
If FileSelected IsNot Nothing AndAlso FileSelected.Value = True Then
Try
FileOpenStream = FileBox.OpenFile()
If (FileOpenStream IsNot Nothing) Then
Dim ByteArray As Byte()
Using br As New BinaryReader(FileOpenStream)
ByteArray = br.ReadBytes(FileOpenStream.Length)
End Using
Dim z As New ZackFile
z.Id = Guid.NewGuid
z.FileData = ByteArray
z.FileSize = CInt(ByteArray.Length)
z.FileName = FileBox.FileName.Split("\").Last
z.DateAdded = Now
db.AddToZackFile(z)
db.SaveChanges()
End If
Catch Ex As Exception
MessageBox.Show("Cannot read file from disk. " & Ex.Message, "Fail", MessageBoxButton.OK, MessageBoxImage.Error)
Finally
If (FileOpenStream IsNot Nothing) Then
FileOpenStream.Close()
End If
End Try
End If
End SubUnd meine ASP.NET MVC-Anwendung dient es zum Download auf einer Website mit FileStreamResult()...
Public Class ZackFileController
Inherits System.Web.Mvc.Controller
Function Display(ByVal id As Guid) As FileStreamResult
Dim db As New EfrDotOrgEntities
Dim Model As ZackFile = (From z As ZackFile In db.ZackFile _
Where z.Id = id _
Select z).First
Dim ByteArray As Byte() = Model.ImageData
Dim FileStream As System.IO.MemoryStream = New System.IO.MemoryStream(ByteArray)
Dim ContentType As String = ?????
Dim f As New FileStreamResult(FileStream, ContentType)
f.FileDownloadName = Model.FileName
Return f
End Function
End ClassAber FileStreamResult() benötigt eine Zeichenfolge für den Inhaltstyp. Wie kann ich den richtigen Inhaltstyp meiner Datei ermitteln?
