Image Properties

[Guest]

I have a few custom controls that expose properties of type Image. The built in controls that have Image properties allow you to delete the image and set it back to "None". How can I allow my own Image propeties to be set back to None just by deleting the image name from the property grid?

Thanks.

J

 

[Linda Liu [MSFT]]

Hi J,

I performed a test on this issue and did see the problem. The following is
the code of my custom control.

class MyControl:Control
{
[DefaultValue((string)null)]
public Image MyImage
{
get{return this.BackgroundImage;}
set { this.BackgroundImage = value; }
}
}

Build the project and add a MyControl on the form. I can delete the image
and set it back to "None" by pressing the Del key in the BackgroundImage
property entry within the Properties window. However, I can't do it in the
MyImage property grid entry.

I use Reflector and see that the BackgroundImage property of the Control
class has a DefaultValueAttribute with the value of (string)null.

I modify my test code as follows:

using System.ComponentModel;
class MyControl:Control
{
[DefaultValue((string)null)]
public Image MyImage
{
get{return this.BackgroundImage;}
set { this.BackgroundImage = value; }
}
}

Build the project and try again. I could now delete the image and set it to
"None" in the MyImage property grid entry by pressing the Del key.

Please try my suggestion and let me know the result.

Sincerely,
Linda Liu
Microsoft Online Community Support

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[Guest]

Thanks, Linda. I think that'll do it.