Object reference not set to an instance of an object. for image.Source to byte[] in wpf

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my code for convert image.source to byte[]

C#

public Byte[] BufferFromImage(BitmapImage imageSource)
{
    Stream stream = imageSource.StreamSource;
    Byte[] buffer = null;
    if (stream != null && stream.Length > 0)
    {
        using (BinaryReader br = new BinaryReader(stream))
        {
            buffer = br.ReadBytes((Int32)stream.Length);
        }
    }

    return buffer;
}

call :

C#

var s = BufferFromImage(image1.Source as BitmapImage);

how to convert image1.Source to byte[] in wpf ?

Posted 3-Oct-12 1:21am

mmd20092010

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Comments

Kiran Susarla 3-Oct-12 7:54am

Where are you getting NullReferenceException in the Code? Does imageSource parameter has any value? Did you check that while debugging?

Matt T Heffron 3-Oct-12 12:38pm

Are you sure that image1.Source *IS* a BitmapImage? If it is not, then using "as BitmapImage" will return null and that will be passed to BufferFromImage.

2 solutions

Solution 2

If you are getting an Object Reference error, and the error is occuring on image1.Source, then likely image1 == null.

Posted 3-Oct-12 6:48am

fjdiewornncalwe

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Matt T Heffron · Accepted Answer · 2012-10-03T08:20:00

Just use the debugger to verify:

C#

image1 != null
image1.Source != null
image1.Source is BitmapImage

or add

C#

System.Diagnostics.Debug.Assert(image1 != null, "image1 is null");
System.Diagnostics.Debug.Assert(image1.Source != null, 
                                "image1.Source is null");
System.Diagnostics.Debug.Assert(image1.Source is BitmapImage, 
                                "image1.Source is NOT a BitmapImage");

right before the call to BufferFromImage.
Then you should know what is wrong and how to fix it.