StrataFrame Forum » StrataFrame Application Framework - V1 » Business Objects and Data Access (How do I?) » Error using Custom Field Property for PictureBox

Error using Custom Field Property for PictureBox

Chris Diesel — Thu, 23 Mar 2017 08:40:40 GMT

I get this error I believe during binding of a Custom Field Property to your PictureBox control. If I break execution right before the field value is returned, it looks correct.

Error:

An error occurred while refreshing the data from field 'IwbProduct.PrimaryImage' to property 'Image' on control '.'

Inner Exception:

Cannot format the value to the desired type.

[code]

#region Custom Field Properties

[Description("Primary Image"), Browsable(false), DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]

public byte[] PrimaryImage

{

get

{

byte[] primaryImage = new byte[0];

if (this.Count > 0 && this.CurrentRow != null)

{

using (IwbProductImages iwbProductImages = new IwbProductImages())

{

primaryImage = iwbProductImages.GetPrimaryImage(this.Guid);

}

return primaryImage;

}

#endregion

/// <summary>

/// Provider property descriptors for the custom bindable fields

/// </summary>

protected override MicroFour.StrataFrame.Business.FieldPropertyDescriptor[] GetCustomBindablePropertyDescriptors()

{

//-- Return the array of property descriptors

return new MicroFour.StrataFrame.Business.FieldPropertyDescriptor[] { new ReflectionPropertyDescriptor("PrimaryImage", typeof(IwbProduct)) };

}

[/code]

Thanks,

Chris

RE: Error using Custom Field Property for PictureBox

StrataFrame Team — Thu, 23 Mar 2017 08:40:40 GMT

Any time the property get throws an error during binding, it wraps it in the binding exception that you're getting.

You'll need to store off the data into a byte[] and check it's length to make sure there's actually data. While you're at it, you might as well catch any exceptions and return a placeholder if you encounter one.

public System.Drawing.Bitmap PrimaryImage

{

get

{

if (this.Count > 0 && this.CurrentRow != null)

{

try

{

using (IwbProductImages iwbProductImages = new IwbProductImages())

{

byte[] imageData = iwbProductImages.GetPrimaryImage(this.Guid);

if ((imageData?.Length ?? 0) > 0)

{

using(MemoryStream ms = new MemoryStream(imageData))

{

return new System.Drawing.Bitmap(ms);

}

else

{

//-- There is no image, so return either nothing or a placeholder

return null;

//return My.Resources.NoImagePlaceholder;

}

catch

{

//-- There was some error loading the image, so return either nothing or a placeholder

return My.Resources.ErrorImagePlaceholder;

//return null;

}

//-- No current row in the BO

return null;

}

RE: Error using Custom Field Property for PictureBox

Chris Diesel — Thu, 23 Mar 2017 08:27:49 GMT

That worked great when there is an image to display. Having problems dealing with no image though. I get the same error listed above when it returns null. Any ideas on that?

Thanks!!!

RE: Error using Custom Field Property for PictureBox

Chris Diesel — Mon, 20 Mar 2017 15:03:28 GMT

Thank you so much!!!! :)

RE: Error using Custom Field Property for PictureBox

StrataFrame Team — Mon, 20 Mar 2017 07:25:53 GMT

The Image property on the PictureBox is a System.Drawing.Bitmap, not a byte[]. You'll need to change the property to return a System.Drawing.Bitmap.

You'll then need to convert your byte[] to a Bitmap using by wrapping it in a MemoryStream.

public System.Drawing.Bitmap PrimaryImage

        {            get            {                if (this.Count > 0 && this.CurrentRow != null)                {                    using (IwbProductImages iwbProductImages = new IwbProductImages())                    {                        using(MemoryStream ms = new MemoryStream(iwbProductImages.GetPrimaryImage(this.Guid)))                        {                            return new System.Drawing.Bitmap(ms);                        }                    }
                }

                return null;
            }        }