调整/重命名上传图像 [英] Resize / Rename upload image

问题描述

大家好，



我正在尝试为我的网站创建一个控件，用户可以通过javascript代码上传图片需要具有特定名称和特定大小width / heigth的图像，

所以在我的C＃文件中我创建以下代码以便make it但它没有用，

重命名代码t工作正常，问题是图像的大小调整它不起作用（我在codeproject中发现了一个相关文章，调整大小图像但是不幸的是，它使用的是Mvc技术而我不这样做。

任何人都可以帮助我修改我的代码中的内容，以便修复将上传的图像的大小调整吗？



Thnx提前!!!

Hi guys,

I' m trying to create a control for my web site where the user will be able to upload images, due to a javascript code i need the images with specific names and specific size "width/heigth",
So in my C# file I create the following code in order to make it but it didn't work,
the rename code t works fine , the issue is the resize of the image which it didn't work (I found a relative article in codeproject with resize images but unfortunatelly it uses Mvc tech and I don't).
Could anyone help me what I should modify in my code in order to fix the resizing of the image which will be upload it?

Thnx in advance!!!

string subimages2 = "~/gallery/thumbs/";
        Boolean fileOK2 = false;
        String path2 = Server.MapPath(subimages2);
        if (FileUpload1.HasFile)
        {
            String fileExtension =
                System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
            String[] allowedExtensions = { ".gif", ".png", ".jpeg", ".jpg" };
            for (int i = 0; i < allowedExtensions.Length; i++)
            {
                if (fileExtension == allowedExtensions[i])
                {
                    fileOK2 = true;
                }
            }
        }

        if (fileOK2)
        {
            try
            {
                   int count = 10;
               
                string fileNameWithoutExtension =    Path.GetFileNameWithoutExtension(FileUpload1.FileName);
                string fileExtension = Path.GetExtension(FileUpload1.FileName);
                fileNameWithoutExtension = Convert.ToString(count);
                FileUpload1.PostedFile.SaveAs(Server.MapPath("~/gallery/thumbs/" + fileNameWithoutExtension + fileExtension));

                //modify width heigth
                HttpPostedFile pf = FileUpload1.PostedFile;
                System.Drawing.Image bm = System.Drawing.Image.FromStream(pf.InputStream);
                bm = ResizeBitmap((Bitmap)bm, 150, 150); /// new width, height
                                
                Label1.Text = "File uploaded!";

            }
            catch (Exception ex)
            {
                Label1.Text = "File could not be uploaded.";
            }
        }
        else
        {
            Label1.Text = "Cannot accept files of this type.";
        }
    }
    private Bitmap ResizeBitmap(Bitmap b, int nWidth, int nHeight)
    {
        Bitmap result = new Bitmap(nWidth, nHeight);
        using (Graphics g = Graphics.FromImage((System.Drawing.Image)result))
            g.DrawImage(b, 0, 0, nWidth, nHeight);
        return result;
    }

推荐答案

参考

http://imageresizing.net/docs/ howto / upload-and-resize [ ^ ]



http://stackoverflow.com/questions/254419/asp-net-image -uploading-with-resizing [ ^ ]

Refer
http://imageresizing.net/docs/howto/upload-and-resize[^]

http://stackoverflow.com/questions/254419/asp-net-image-uploading-with-resizing[^]

public static Bitmap GetThumbnail(Bitmap source, int maxWidth, int maxHeight)
        {
            int iHeight = 0;
            int iWidth = 0;
            iHeight = source.Height;
            iWidth = source.Width;

            if (source.Width > maxWidth)
            {
                if (source.Width > source.Height)
                {
                    iWidth = maxWidth;
                    iHeight = source.Height * maxWidth / source.Width;
                }
                else
                {
                    iHeight = maxHeight;
                    iWidth = source.Width * maxHeight / source.Height;
                }
            }
            else if (source.Height > maxHeight)
            {
                if (source.Width > source.Height)
                {
                    iWidth = maxWidth;
                    iHeight = source.Height * maxWidth / source.Width;
                }
                else
                {
                    iHeight = maxHeight;
                    iWidth = source.Width * maxHeight / source.Height;
                }
            }
            Bitmap dest = new Bitmap(source, iWidth, iHeight);
            return dest;
        }

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