چک کردن سايز و حجم و نوع تصوير در آپلود

کد:

protected void btn_priview_Click(object sender, EventArgs e)

    {

        WebClient wc = new WebClient();

        string url = txt_logourl.Text;

        string[] Arry = url.Split('/');

        string filename = Arry[Arry.Length - 1];

        string savepath = Server.MapPath("~/Uploads/" + filename);

        wc.DownloadFile(url, savepath);

        img_logo.ImageUrl = "Uploads/" + filename;



        ViewState["logoname"] = filename;

    }

کد:

Imports System.Drawing

Imports System.Drawing.Drawing2D

 

Dim gu As New Guid

gu = Guid.NewGuid

Dim ext As String = Path.GetExtension(FileUpload1.FileName)

ImageName = gu.ToString & ext

FileUpload1.SaveAs(Server.MapPath("~/DynamicImages/News/" & ImageName))

Using fl = File.OpenRead(Server.MapPath("~/DynamicImages/News/" & ImageName))

    Using thumbFile = File.Create(Server.MapPath("~/DynamicImages/News/thumbnails/" & ImageName))

        ResizeImage(0.1, fl, thumbFile)

    End Using

End Using

 

Private Sub ResizeImage(ByVal scaleFactor As Double, ByVal fromStream As Stream, ByVal toStream As Stream)

    Using image__1 = Image.FromStream(fromStream)

        'Dim newWidth = CInt(image__1.Width * scaleFactor)

        ' Dim newHeight = CInt(image__1.Height * scaleFactor)

        Dim newWidth = 150

        Dim newHeight = 150

 

        Using thumbnailBitmap = New Bitmap(newWidth, newHeight)

            Using thumbnailGraph = Graphics.FromImage(thumbnailBitmap)

                thumbnailGraph.CompositingQuality = CompositingQuality.HighQuality

                thumbnailGraph.SmoothingMode = SmoothingMode.HighQuality

                thumbnailGraph.InterpolationMode = InterpolationMode.HighQualityBicubic

 

                Dim imageRectangle = New Rectangle(0, 0, newWidth, newHeight)

                thumbnailGraph.DrawImage(image__1, imageRectangle)

 

                thumbnailBitmap.Save(toStream, image__1.RawFormat)

            End Using

        End Using

    End Using

End Sub