使用C＃asp.net无法获得正确的文件路径

Question

我正在尝试显示一些图像，这些图像是使用c＃asp.net从数据库中获取的，但出现了一些错误。

错误：

“ /”应用程序中的服务器错误。

C：\\ ASP project \\ Odiya_Doctor_Client \\ Odiya_Doctor_Client \\ ODIYA_Doctor_Admin \\ Upload \\ Banner \\ 2015-07-09_01-50-41-PM_Medical-banner-with-icons.jpg

说明：执行当前Web请求期间发生未处理的异常。 请查看堆栈跟踪，以获取有关错误及其在代码中起源的更多信息。

异常详细信息：System.IO.FileNotFoundException：C：\\ ASP project \\ Odiya_Doctor_Client \\ Odiya_Doctor_Client \\ ODIYA_Doctor_Admin \\ Upload \\ Banner \\ 2015-07-09_01-50-41-PM_Medical-banner-with-icons.jpg

我在下面解释我的代码。

的Index.aspx：

<img runat="server" id="imgCtrl" src='<%# resizeAndConvertToBase64("/ODIYA_Doctor_Admin/Upload/Banner/" + Convert.ToString(Eval("Bnr_Image")),1920,680) %>' class="ls-bg" />

index.aspx.cs：

protected string resizeAndConvertToBase64(string imageDirectory, int newWidth, int newHeight)
        {
            Bitmap newImage = new Bitmap(newWidth, newHeight);
            System.Drawing.Image srcImage = System.Drawing.Image.FromFile(Server.MapPath(imageDirectory));
            using (Graphics gr = Graphics.FromImage(newImage))
            {
                gr.SmoothingMode = SmoothingMode.HighQuality;
                gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
                gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
                gr.DrawImage(srcImage, new Rectangle(0, 0, newWidth, newHeight));

            }
            MemoryStream ms = new MemoryStream();
            newImage.Save(ms, ImageFormat.Gif);
            var base64Data = Convert.ToBase64String(ms.ToArray());
            return "data:image/gif;base64," + base64Data;
        }

实际上，我想访问c:\\ASP\\ODIYA_Doctor_Admin\\Upload\\Banner文件夹中存在的一个图像，但是在这里，我的inde.aspx页面位于c:\\ASP\\Odiya_Doctor_Client\\Odiya_Doctor_Client文件夹中。 在错误消息中，路径为C:\\ASP project\\Odiya_Doctor_Client\\Odiya_Doctor_Client\\ODIYA_Doctor_Admin\\Upload\\Banner\\2015-07-09_01-50-41-PM_Medical-banner-with-icons.jpg ，我要从此路径进入删除\\Odiya_Doctor_Client\\Odiya_Doctor_Client 。 因此，请帮助我解决此错误。

Answer 1

使用fileupload控件而不是server.mappath来确定文件位置，因为server.mappath总是在查看解决方案文件夹

private void getPicture()
 {
      string location = FileUpload1.PostedFile.FileName;
      resizeAndConvertToBase64(location, 100,100);
 }

 protected string resizeAndConvertToBase64(string imageDirectory, int newWidth, int newHeight)
    {
        Bitmap newImage = new Bitmap(newWidth, newHeight);
        System.Drawing.Image srcImage = imageDirectory;
        using (Graphics gr = Graphics.FromImage(newImage))
        {
            gr.SmoothingMode = SmoothingMode.HighQuality;
            gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
            gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
            gr.DrawImage(srcImage, new Rectangle(0, 0, newWidth, newHeight));

        }
        MemoryStream ms = new MemoryStream();
        newImage.Save(ms, ImageFormat.Gif);
        var base64Data = Convert.ToBase64String(ms.ToArray());
        return "data:image/gif;base64," + base64Data;
    }

Answer 2

I would suggest you to do this way:

1. Create a application setting:

      <appSettings >
        <add key="ImgFolderPath" value="c:\ASP\ODIYA_Doctor_Admin\Upload\Banner"/>
      </appSettings>
2. Change your aspx code:

    <img runat="server" id="imgCtrl" src='<%# resizeAndConvertToBase64( Convert.ToString(Eval("Bnr_Image")),1920,680) %>' class="ls-bg" />

3. Change your .cs page code:


protected string resizeAndConvertToBase64(string imageName, int newWidth, int newHeight)
            {
                Bitmap newImage = new Bitmap(newWidth, newHeight);
                string path = ConfigurationManager.AppSettings["ImgFolderPath"].ToString();
                System.Drawing.Image srcImage = System.Drawing.Image.FromFile(path+"/"+imageName));
                using (Graphics gr = Graphics.FromImage(newImage))
                {
                    gr.SmoothingMode = SmoothingMode.HighQuality;
                    gr.InterpolationMode = InterpolationMode.HighQualityBicubic;
                    gr.PixelOffsetMode = PixelOffsetMode.HighQuality;
                    gr.DrawImage(srcImage, new Rectangle(0, 0, newWidth, newHeight));

                }
                    MemoryStream ms = new MemoryStream();
                    newImage.Save(ms, ImageFormat.Gif);
                    var base64Data = Convert.ToBase64String(ms.ToArray());
                    return "data:image/gif;base64," + base64Data;
                }