ASP.NET图片上传与大小调整 [英] ASP.NET Image uploading with Resizing

问题描述

我有一个aspx页面，将图像上传到服务器硬盘从客户端PC

I have an aspx page which will upload images to server harddisk from client pc

但现在我需要改变我的程序以这样一种方式，它可以让我调整图像大小，同时上传

But now i need to change my program in such a way that it would allow me to resize the image while uploading.

有没有人有这个什么想法？我想不出找不到这样的属性/输入与文件服务器的控制方法

Does anyone has any idea on this ? I couldnt not find such properties/methods with Input file server control

任何人来指导我？

推荐答案

一旦文件被保存到你可以用code这样来调整服务器。这code会照顾的长/宽比的调整大小。

Once the file has been saved to the server you can use code like this to resize. This code will take care of length/width ratio on the resize.

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;
}

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