C＃图像转换对FILESTREAM [英] C# Convert Image To FileStream

问题描述

我的应用程序至今让用户通过文件选择器中选择一个图像，并上传至通过FTP文件流：

My application so far lets the user select an image via the file selector and upload it through a file stream via FTP:

        Stream ftpStream = request.GetRequestStream();
        FileStream file = File.OpenRead(fileToUpload);
        length = 1024;

        buffer = new byte[length];
           do
            {
                bytesRead = file.Read(buffer, 0, length);
                ftpStream.Write(buffer, 0, bytesRead);
                totalReadBytesCount += bytesRead;
                var progress = totalReadBytesCount * 100.0 / totalToUpload;
                backgroundWorker1.ReportProgress((int)progress);
            }
            while (bytesRead != 0);

这工作正常。
所选图像保存为一个文件，然后上传。

This works fine. The selected image is saved as a file and then uploaded.

不过，现在我想将它保存为图像这样我就可以调整它的大小等，所以该代码将是：

Now, however, I wish to save it as a 'Image' so I can resize it etc. So that the code would be:

            if (openFileDialog1.ShowDialog() == DialogResult.OK)
        {
            image = Image.FromFile(openFileDialog1.FileName);
        }

至于反对：

As opposed to:

  if (openFileDialog1.ShowDialog() == DialogResult.OK)
    {
        file = openFileDialog1.FileName;
    }

因此，我的问题是：

My question thus is:

现在我选择的文件是一个图像文件。如何转换入FILESTREAM？如果不能轻松完成，然后我将如何通过FTP上传图片？
先谢谢了。

Now my selected file is a Image file. How do I convert it into the filestream? If this can't be done easily then how would I upload the image via ftp? Thanks in advance.

推荐答案

要写入图像的文件流，我会建议使用的保存功能Image类。即

To write the image to the filestream, I would recommend using the Save function of the Image class. I.E

image = Image.FromFile(openFileDialog1.FileName);
image.Save(ftpStream, System.Drawing.Imaging.ImageFormat.Png);

显然，你需要检查错误，并可能使用不同的图像格式。

Obviously, you'll need to check for errors and possibly use a different image format.

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