object component

3 Dec 2005 9:30 PM

Jim McGivney

On an aspx page with C# code behind I am trying to programmatically change
the ImageUrl of various ImageButtons in response to the text contained in
corresponding label controls.

The following code works:

PropertyDescriptorCollection properties =
TypeDescriptor.GetProperties(this.ImageButton12);

PropertyDescriptor myProperty = properties.Find("ImageUrl", false);

myProperty.SetValue(ImageButton12,@"C:\Inetpub\wwwroot\BB\images\X.BMP")

Now I want to replace all references to "ImageButton12" in the above code
with a member of an array such as "pram[2]" so that I can loop through all
the ImageBoxes easily in code.

Where:

string[] pram = new string[]
{"Label33","Label34","Label35","Label36","Label37","Label38","Label39"};

or

string[] pram = new string[] {"this.Label33","this.Label34","this.Label35","
this.Label36"," this.Label37"," this.label38"," this.Label39"};

or

Object[] pram = new Object[]
{"this.Label33","this.Label34","Label35","Label36","Label37","Label38","Label39"};

Each time a get an "Object reference not set to an instance of an object"
error.

I have even tried changing the array to a component array, but then I get a
"Can't implicitly change type" error.

The data type specified is "object component" I need to build an array of
object components that I can address by index number.

Any insight would be appreciated.

Thanks,

Jim

3 Dec 2005 9:50 PM

Eric

Although I'm more a VB programmer, I think I know the answer:
(correct me if I'm wrong)

in the line :
myProperty.SetValue(ImageButton12,@"C:\Inetpub\wwwroot\BB\images\X.BMP")

ImageButton12 is a object, in this case a button.
What you are trying to do is to replace a button-object with a string.
The setvalue method then does not recognize it as an object and gives an
error.

rg.
Eric

Show quote

"Jim McGivney" <mcgiv1@no-spam.sbcglobal.net> schreef in bericht
news:u6RZQDF%23FHA.1140@tk2msftngp13.phx.gbl...
> On an aspx page with C# code behind I am trying to programmatically change
> the ImageUrl of various ImageButtons in response to the text contained in
> corresponding label controls.
>
>
>
> The following code works:
>
>
>
> PropertyDescriptorCollection properties =
> TypeDescriptor.GetProperties(this.ImageButton12);
>
>
>
> PropertyDescriptor myProperty = properties.Find("ImageUrl", false);
>
>
>
> myProperty.SetValue(ImageButton12,@"C:\Inetpub\wwwroot\BB\images\X.BMP")
>
>
>
>
>
> Now I want to replace all references to "ImageButton12" in the above code
> with a member of an array such as "pram[2]" so that I can loop through
> all the ImageBoxes easily in code.
>
>
>
> Where:
>
>
>
> string[] pram = new string[]
> {"Label33","Label34","Label35","Label36","Label37","Label38","Label39"};
>
>
>
> or
>
>
>
> string[] pram = new string[]
> {"this.Label33","this.Label34","this.Label35"," this.Label36","
> this.Label37"," this.label38"," this.Label39"};
>
>
>
> or
>
>
>
> Object[] pram = new Object[]
> {"this.Label33","this.Label34","Label35","Label36","Label37","Label38","Label39"};
>
>
>
>
>
> Each time a get an "Object reference not set to an instance of an object"
> error.
>
>
>
> I have even tried changing the array to a component array, but then I get
> a "Can't implicitly change type" error.
>
>
>
> The data type specified is "object component" I need to build an array of
> object components that I can address by index number.
>
>
>
> Any insight would be appreciated.
>
> Thanks,
>
> Jim
>
>
>
>
>
>
>
>