How to read image dimensions at C# wpf - there is no dispose method for BitmapImage

Question

With the way below i am able to read.

But there is no dispose method so i am not able to delete the file later.

So the below method is getting failed.

I could not come up with a proper solution.

Bitmap class is not recognized in C# 4.5 WPF application.

thank you

    DirectoryInfo dInfo = new DirectoryInfo(@"C:\pokemon_files\images\");
    FileInfo[] subFiles = dInfo.GetFiles();

    BitmapImage myImg;
    foreach (var vrImage in subFiles)
    {
        string srFilePath = vrImage.FullName;
        System.Uri myUri = new Uri(srFilePath);
        myImg = new BitmapImage(myUri);

        if (myImg.Width < 50)
        {
            File.Delete(srFilePath);
            continue;
        }
     }

duplicate http://stackoverflow.com/questions/10319447/release-handle-on-file-imagesource-from-bitmapimage — Dmitrii Dovgopolyi, Mar 27 '13 at 11:25

score 1 · Accepted Answer · edited May 23 '17 at 12:23

I assume the error you get is caused by trying to delete the file which is currently in use by the bitmap (I don't remember the exception name).

There is a solution to that, that is: making a byte stream.

byte[] imageData;

using(var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
using(var binaryReader = new BinaryReader(fileStream))
{
    imageData = binaryReader.ReadBytes((int)fileStream.Length);
}

var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.StreamSource = new MemoryStream(imageData);
bitmap.EndInit();

//Now you can check the width & height, the file stream should be closed so you can
//delete the file.

[EDIT] If you don't want to read the bytes by BinaryReader, there's always this solution if you want to read all bytes from the file.

You should allways check the amount of bytes you receive from `ReadBytes` method. — Dmitrii Dovgopolyi, Mar 27 '13 at 11:28

How to read image dimensions at C# wpf - there is no dispose method for BitmapImage

1 Answers1