Result: Failure Exception: System.Exception: Value cannot be null. (Parameter 'buffer')

Priya

1278 Points

37 Posts

Gettinng error with itext pdf during image imbeding:

Result: Failure Exception: System.Exception: Value cannot be null. (Parameter 'buffer') ---> System.ArgumentNullException: Value cannot be null. (Parameter 'buffer') at System.ArgumentNullException.Throw(String paramName) at System.IO.MemoryStream..ctor(Byte[] buffer) at iText.IO.Image.ImageTypeDetector.ReadImageType(Byte[] source) at iText.IO.Image.ImageTypeDetector.DetectImageType(Byte[] source) at iText.IO.Image.ImageDataFactory.CreateImageInstance(Byte[] bytes, Boolean recoverImage) at iText.IO.Image.ImageDataFactory.Create(Byte[] bytes, Boolean recoverImage) at iText.IO.Image.ImageDataFactory.Create(Byte[] bytes) at

.net-8.0 itext-7

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Posted On: 04-Jun-2025 22:56

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Answers

Rashmi

1200 Points

20 Posts

This means that a null value was passed to a method expecting a non-null byte[] buffer — specifically, to the constructor of System.IO.MemoryStream, which is then used by iText's ImageTypeDetector.

Here's what's happening in your call stack:

You're passing a byte[] to ImageDataFactory.Create(...).
That method internally tries to use ImageTypeDetector, which creates a MemoryStream using that byte array.
But since the byte array (buffer) is null, the constructor throws an ArgumentNullException.