C＃错误CS0103当前上下文中不存在名称“ originalImage”

Question

I have problem with my code, I've tryed string originalImage = null; . But this not really working. Because its not taking original file name somehow..

Code:

 private void textBox1_Click(object sender, EventArgs e)
    {
        FolderBrowserDialog fbd = new FolderBrowserDialog();
        fbd.RootFolder = Environment.SpecialFolder.Desktop;
        fbd.Description = "+++ Select path +++";
        fbd.ShowNewFolderButton = false;

        if (fbd.ShowDialog() == DialogResult.OK)
        {
            textBox1.Text = fbd.SelectedPath;
        }
        string[] originalImage = Directory.GetFiles(textBox1.Text, "*.JPG");

        foreach (var filename in originalImage)
        {
            Bitmap bitmap = new Bitmap(filename);

            //DefaultCompressionJpeg(bitmap);

            VariousQuality(bitmap);
        }
    }

    string originalImage = null;

    public void VariousQuality(Image original)
    {

        ImageCodecInfo jpgEncoder = null;
        ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
        foreach (ImageCodecInfo codec in codecs)
        {
            if (codec.FormatID == ImageFormat.Jpeg.Guid)
            {
                jpgEncoder = codec;
                break;
            }
        }
        if (jpgEncoder != null)
        {

            Encoder encoder = Encoder.Quality;
            EncoderParameters encoderParameters = new EncoderParameters(1);

            for (long quality = 90; quality <= 90;)
            {
                EncoderParameter encoderParameter = new EncoderParameter(encoder, quality);
                encoderParameters.Param[0] = encoderParameter;

                string fileOut = Path.Combine(@"C:\Users\Kristen\Desktop\pilt2",  originalImage + ".jpeg");
                Debug.WriteLine(fileOut);
                FileStream ms = new FileStream(fileOut, FileMode.Create, FileAccess.Write);
                original.Save(ms, jpgEncoder, encoderParameters);
                ms.Flush();
                ms.Close();
            }
        }
    }

Kind regards,

Answer 1

As someone suggested in the comments (which they mysteriously deleted because they were definitely on to something), it seems like you're trying to refer to the original argument:

public void VariousQuality(Image original)

Just rename either that arg to originalImage or rename the other in your code to original .

Answer 2

In you click eventhandler you have a local variable string [] originalImage which you initialize with all the filenames in some directory.

On class level you have a field string originalImage which you initialize with null .

These two elements do have nothing to do with each other, they are completely unrelated.

So in your compression method you use an originalImage to construct a filename. The only entity of this name known in this method is the string field of the class, which has a null value.

You should add a second parameter to your compression method where you pass the current filename to your method and remove the field from the class.

public void VariousQuality (Bitmap original, string filename) {
   ...

 string fileOut = Path.Combine(@"C:\Users\Kristen\Desktop\pilt2", filename + ".jpeg");

}

Call the method as follows

foreach (var filename in originalImage) { 
    Bitmap bitmap = new Bitmap(filename);
 //DefaultCompressionJpeg(bitmap);
    string fn = Path.GetFileNameWithoutExtension(filename);
    VariousQuality(bitmap, fn); 
}