Why Does Converting a JPEG to a MemoryStream Throw a 'Generic Error Occurred in GDI ' Exception?

GDI Error During JPEG to MemoryStream Conversion

Issue:

Converting JPEG images to memory streams using ConvertImageToByteArray (or similar methods) results in a generic GDI error:

<code>System.Runtime.InteropServices.ExternalException: A generic error occurred in GDI+.</code>

This problem only affects JPEGs; PNG conversions work without issue.

Root Cause:

The error stems from prematurely closing the memory stream used to create the image object before saving the image.

Resolution:

The solution is to keep the memory stream open throughout the image saving process:

<code class="language-csharp">using (var m = new MemoryStream())
{
    dst.Save(m, format);
    // ... other code ...
    return Image.FromStream(m); // MemoryStream remains open until the end of the using block
}</code>

Further Notes:

Using a memory stream is crucial for preserving the image's MIME type. Without it, the output image's MIME type is undefined, complicating generic error handling.

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