如何将调整大小的图像保存到在ASP.NET MVC 5中上传到服务器的数据库中

Question

我想将使用Imageresizer插件调整大小的图像保存到数据库。 这是我的代码。

<HttpPost()>
    <ValidateAntiForgeryToken()>
    Async Function Edit(ByVal employeeMaster As EmployeeMaster, ByVal upload As HttpPostedFileBase) As Task(Of ActionResult)
        Try
            If ModelState.IsValid Then
                    If upload IsNot Nothing Then
                        'Dim imageData As Byte()= New [Byte](upload.InputStream.Length - 1) {}          // this section saving to database which is original file ----- start
                        'upload.InputStream.Read(imageData, 0, CInt(upload.InputStream.Length))
                        'employeeMaster.Photo = imageData  // --- end

                        Dim guid1 As String = Guid.NewGuid().ToString()
                        Dim filename = guid1
                        Dim versions = New Dictionary(Of String, String)()
                        Dim path1 = Server.MapPath("~/Content/")
                        versions.Add("", "maxwidth=600&maxheight=600&format=jpg")
                        For Each suffix As String In versions.Keys
                            upload.InputStream.Seek(0, SeekOrigin.Begin)
                            ImageBuilder.Current.Build(New ImageJob(upload.InputStream, path1 + filename, New Instructions(versions(suffix)), False, True))
                        Next
                        Dim savedFileName = Path.Combine(path1, Path.GetFileName(filename))

                        Return File(savedFileName, "application/octet-stream", filename)
                        upload.SaveAs(savedFileName)
                        Dim imageData As Byte()= New [Byte](upload.InputStream.Length - 1) {}     // trying to save new image to database ----- start
                        upload.InputStream.Read(imageData, 0, CInt(upload.InputStream.Length))
                        employeeMaster.Photo = imageData  // -----end
                        Dim size1 = upload.ContentLength
                        Dim fullPath As String = Request.MapPath("~/Content/" + filename)
                        If System.IO.File.Exists(fullPath) Then
                            Dim ex = "ok"
                            System.IO.File.Delete(fullPath)
                        End If
                    End If
                    db.Entry(employeeMaster).State = EntityState.Modified
                    Await db.SaveChangesAsync()

                    Dim json1 = New With {Key .message = "Updated Successfully", Key .error = "False"}
                    Return Json(json1, JsonRequestBehavior.AllowGet)
                Else
                    'logic for when that description exists
                    'for example, to add to ModelState
                    ModelState.AddModelError("EmployeeCode", "EmployeeCode Exists")
                End If
        Catch ex As DbEntityValidationException

        End Try
    End Function

上传的文件可以直接保存到数据库。 但是我正在使用Imageresizer插件压缩该图像。 然后将其保存到文件夹中。我正在尝试读取该文件夹中保存的图像，并将新形成的图像保存到数据库中。 怎么办

Answer 1

我已经解决了问题。 这是代码

Dim _fileInfo As New System.IO.FileInfo(savedFileName)
                        Dim _NumBytes As Long = _fileInfo.Length
                        Dim _FStream As New System.IO.FileStream(savedFileName, System.IO.FileMode.Open, System.IO.FileAccess.Read)

                        'upload.SaveAs(savedFileName)
                        imageData = New [Byte](_FStream.Length - 1) {}
                        _FStream.Read(imageData, 0, CInt(_FStream.Length))
                        employeeMaster.Photo = imageData