使用Resizing上传ASP.NET图像

Question

我有一个aspx页面,它将从客户端pc上传图像到服务器硬盘

但现在我需要改变我的程序,这样我就可以在上传时调整图像大小.

有没有人对此有任何想法？我无法使用输入文件服务器控件找到这样的属性/方法

那里有人指导我吗？

Answer 1

将文件保存到服务器后,您可以使用此类代码来调整大小.此代码将处理调整大小时的长/宽比.

public static Bitmap CreateThumbnail(string lcFilename, int lnWidth, int lnHeight)
{

    System.Drawing.Bitmap bmpOut = null;

    try
    {
        Bitmap loBMP = new Bitmap(lcFilename);
        ImageFormat loFormat = loBMP.RawFormat;

        decimal lnRatio;
        int lnNewWidth = 0;
        int lnNewHeight = 0;

        if (loBMP.Width < lnWidth && loBMP.Height < lnHeight)
            return loBMP;

        if (loBMP.Width > loBMP.Height)
        {
            lnRatio = (decimal)lnWidth / loBMP.Width;
            lnNewWidth = lnWidth;
            decimal lnTemp = loBMP.Height * lnRatio;
            lnNewHeight = (int)lnTemp;
        }
        else
        {
            lnRatio = (decimal)lnHeight / loBMP.Height;
            lnNewHeight = lnHeight;
            decimal lnTemp = loBMP.Width * lnRatio;
            lnNewWidth = (int)lnTemp;
        }


        bmpOut = new Bitmap(lnNewWidth, lnNewHeight);
        Graphics g = Graphics.FromImage(bmpOut);
        g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
        g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
        g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
        g.PixelOffsetMode = System.Drawing.Drawing2D.PixelOffsetMode.HighQuality;
        g.FillRectangle(Brushes.White, 0, 0, lnNewWidth, lnNewHeight);
        g.DrawImage(loBMP, 0, 0, lnNewWidth, lnNewHeight);

        loBMP.Dispose();
    }
    catch
    {
        return null;
    }
    return bmpOut;
}

Answer 2

您将无法"动态"调整大小,因为在执行任何图像转换之前,您需要拥有完整的图像.但是,在上传完成后,在向用户显示任何结果之前,您可以使用我在几个应用程序中使用的基本图像大小调整方法:

   ''' <summary>
   '''    Resize image with GDI+ so that image is nice and clear with required size.
   ''' </summary>
   ''' <param name="SourceImage">Image to resize</param>
   ''' <param name="NewHeight">New height to resize to.</param>
   ''' <param name="NewWidth">New width to resize to.</param>
   ''' <returns>Image object resized to new dimensions.</returns>
   ''' <remarks></remarks>
   Public Shared Function ImageResize(ByVal SourceImage As Image, ByVal NewHeight As Int32, ByVal NewWidth As Int32) As Image

      Dim bitmap As System.Drawing.Bitmap = New System.Drawing.Bitmap(NewWidth, NewHeight, SourceImage.PixelFormat)

      If bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format1bppIndexed Or _
          bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format4bppIndexed Or _
          bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format8bppIndexed Or _
          bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Undefined Or _
          bitmap.PixelFormat = Drawing.Imaging.PixelFormat.DontCare Or _
          bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format16bppArgb1555 Or _
          bitmap.PixelFormat = Drawing.Imaging.PixelFormat.Format16bppGrayScale Then
         Throw New NotSupportedException("Pixel format of the image is not supported.")
      End If

      Dim graphicsImage As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(bitmap)

      graphicsImage.SmoothingMode = Drawing.Drawing2D.SmoothingMode.HighQuality
      graphicsImage.InterpolationMode = Drawing.Drawing2D.InterpolationMode.HighQualityBicubic
      graphicsImage.DrawImage(SourceImage, 0, 0, bitmap.Width, bitmap.Height)
      graphicsImage.Dispose()
      Return bitmap

   End Function